415 Questions
What is the main purpose of VSEPR theory?
To predict the shape of molecules
What determines the geometry of a molecule according to VSEPR theory?
The number of electron pairs around a central atom
What is the shape of a molecule with 2 bonding pairs and 2 lone pairs around the central atom?
Bent or Angular
What is the ability of an atom to attract electrons towards itself known as?
Electronegativity
What is the importance of electronegativity in determining the nature of bonds between atoms?
It influences the polarity of molecules
What is the shape of the molecule BeCl₂?
Linear
What is the shape of the molecule BF₃?
Trigonal Planar
What is the shape of the molecule NH₃?
Trigonal Pyramidal
Who introduced the concept of electronegativity?
Linus Pauling
What is the purpose of drawing a Lewis diagram in determining molecular shape?
To show the arrangement of valence electrons around the central atom
What is the primary reason why atoms form bonds?
To achieve a more stable electron configuration
What is the term for the electrons in the outermost energy level of an atom?
Valence electrons
What determines whether a bond will form between two atoms?
The interaction of repulsive and attractive forces
What is the purpose of Lewis Diagrams?
To represent the valence electrons around an atom's chemical symbol
What is the definition of a covalent bond?
A type of chemical bond where pairs of electrons are shared between atoms
What is the term for a covalent bond where both electrons in the bond come from the same atom?
Dative covalent bond
What determines how molecules interact and react with other molecules?
The molecular shape
What is the term for a covalent bond where three pairs of electrons are shared between two atoms?
Triple bond
What is the name of the scientist who won the Nobel Prize in Chemistry in 1954 for his work on bonds between atoms in molecules?
Linus Pauling
What is the range of electronegativity values for elements except for noble gases?
0 to 4
What type of bond is formed when the electronegativity difference between two atoms is 0?
Non-Polar Covalent Bond
What is the characteristic of a polar molecule?
Uneven distribution of charges
How do you calculate the electronegativity difference between two atoms?
Subtract the smaller value from the larger value
What is the type of bond formed when there is a complete transfer of electrons?
Ionic Bond
What determines the molecular polarity of a molecule?
Electronegativity differences, molecular shape, and symmetry
What is the term for the distance between the nuclei of two adjacent atoms when they form a bond?
Bond length
What is the physical property that is affected by molecular polarity?
Solubility and melting and boiling points
What is the term for the amount of energy required to break a bond between two atoms?
Bond energy
What is the main factor that influences the strength of a bond?
Bond length
What is the result of the interaction between the repulsive force between electrons and the attractive force between nucleus and electrons?
Decreased energy
What is the bond energy?
The energy difference between the bonded state and the state where atoms are far apart
What is the characteristic of a polar molecule?
Having a difference in electronegativity between atoms
What type of intermolecular force occurs between an ion and a non-polar molecule?
Ion-induced dipole force
What is the term for the temporary dipole that occurs in non-polar molecules?
Induced dipole
What is the result of the interaction between the repulsive force between nuclei and the attractive force between electrons and nucleus?
Increased energy
What is the term for the energy minimum point where the bond forms?
Minimum energy point
What is the characteristic of a dipole-dipole force?
Occurs between polar molecules
What is the term for the forces that act between molecules?
Intermolecular forces
What type of forces are present in all molecules but are the only forces in non-polar molecules?
London dispersion forces
Which type of intermolecular force occurs when a polar molecule induces a dipole in a non-polar molecule?
Dipole-induced dipole forces
What is the primary reason for the relatively strong intermolecular force between water molecules?
The hydrogen bonds between hydrogen and oxygen atoms
What is the result of strong intermolecular forces between molecules?
High melting and boiling points
What is the effect of increasing the number of carbon atoms in organic compounds like alkanes?
An increase in boiling point and melting point
What is the primary reason why water molecules attract ions?
Due to the partial charges on the atoms
What is the unique property of water that allows it to absorb a lot of energy before its temperature changes significantly?
High specific heat
What is the type of intermolecular force responsible for the relatively strong intermolecular force between water molecules?
Hydrogen bonds
What is the phrase that summarizes the principle of solubility?
Like dissolves like
What is the result of weak intermolecular forces between molecules?
Gases
What is the role of water in biological functions?
To transport nutrients and waste products
What is the term for the ability of a substance to conduct heat?
Thermal conductivity
What is the direction of the magnetic field lines around a current-carrying wire?
Perpendicular to the direction of the current
What determines the direction of the magnetic field around a current-carrying wire?
The Right Hand Rule
What is the result of increasing the size of molecules in organic compounds?
An increase in intermolecular forces
What is the shape of the magnetic field lines around a straight wire?
Concentric circles
What is the pattern of the magnetic field lines around a current-carrying loop of wire?
A pattern that converges through the loop
What is the term for the ability of water to dissolve a wide range of substances?
Solvent properties
What is the role of water in environmental processes?
To facilitate the distribution of nutrients in soil
Why do non-polar substances not dissolve well in water?
Because they are not polar
What is the role of water's high specific heat in biological systems?
To maintain stable temperatures within organisms
Why is water able to absorb and store heat energy?
Due to its ability to absorb infra-red radiation
What is the significance of water's melting point and boiling point?
They allow water to exist as a liquid over a wide range of temperatures
Why is water's high heat of vaporisation important for life on Earth?
It prevents the evaporation of bodily water
What is the result of the strong hydrogen bonds between water molecules?
Water has a high heat of vaporisation
Why is water's ability to absorb and store heat energy important for the Earth's climate?
It helps to regulate the Earth's climate
What is the significance of the fact that ice is less dense than liquid water?
It allows aquatic life to exist under the frozen surface
What is the role of hydrogen bonds in determining the melting and boiling points of water?
They increase the melting and boiling points of water
What is the result of water's ability to dissolve ionic and polar substances?
Water becomes a good solvent
Why is water's ability to interact with and dissolve various substances important?
It is essential for many biological and ecological processes
What is the formula for calculating power in an electrical circuit?
P = I ⋅ V
What is the unit of measurement for power?
Watts
What is the formula for calculating electrical energy?
E = P ⋅ t
What is the total resistance in a parallel circuit given by?
1/Rp = 1/R1 + 1/R2 + 1/R3 + … + 1/Rn
What is the current in a series circuit?
I = I1 = I2 = I3
What is the voltage across each resistor in a series circuit?
V = V1 + V2 + V3
What is the total current in a parallel circuit?
I = I1 + I2 + I3
What is the voltage across all components in a parallel circuit?
V = V1 = V2 = V3
What is the power dissipated or consumed by a circuit proportional to?
The current and the voltage
What is the purpose of a battery in a circuit?
To convert chemical potential energy into electrical energy
What is the direction of the magnetic field lines when your fingers follow the current's direction using the Right Hand Rule?
Towards the north pole of a bar magnet
What is the characteristic of the magnetic field inside a solenoid?
Strong and uniform
What is the purpose of electromagnets?
To maximize the magnetic field strength
What is the effect of power lines on the environment?
They can cause bird fatalities
What is the principle of electromagnetic induction?
A changing magnetic field induces a voltage across a wire
What is the unit of magnetic flux?
Weber
What is the formula for magnetic flux?
φ = B A cos θ
What is the direction of the induced emf according to Lenz's Law?
Opposite to the direction of the increasing magnetic field
What is the purpose of Faraday's Law of Electromagnetic Induction?
To determine the induced emf in a loop
What happens when a south pole of a magnet approaches a loop?
The induced emf generates a current that opposes the increase in magnetic field strength
What is the direction of the induced current when a south pole is moving away?
The current flows in a way to create a magnetic field that attracts the south pole.
What is the principle behind electromagnetic induction?
The induced current will create a magnetic field that opposes the change in the magnetic flux.
What is the relationship between current, voltage, and resistance in a circuit?
I = V / R
What is an example of a non-ohmic conductor?
Light bulb
What is the total resistance in a series circuit?
The sum of the resistances of all the resistors
What is the formula for resistance in a circuit?
R = V / I
What is the characteristic of a conductor that obeys Ohm’s Law?
The resistance is constant at a constant temperature
What is the purpose of electromagnetic induction?
To convert mechanical energy into electrical energy
What is the direction of the induced current when a south pole is approaching?
The current flows in a way to create a magnetic field that opposes the south pole’s field.
What is Lenz’s Law?
The induced current will create a magnetic field that opposes the change in the magnetic flux.
What is the unit of measurement for electrical energy in household and commercial contexts?
Kilowatt-hours
What is the formula to calculate the cost of electricity?
Cost = Power (kW) × Time (hours) × Cost per kWh
What is the conversion factor to convert power from watts to kilowatts?
Divide by 1000
How do you calculate the total energy consumed by an electrical device?
Multiply the power rating by the time in hours
What is the purpose of understanding the principles of electrical power and energy?
To design and manage electrical circuits effectively
What is the unit of measurement for power in an electrical device?
Watts
What is the shape of a molecule with 3 bonding pairs and 1 lone pair around the central atom?
Trigonal Pyramidal
What is the importance of electronegativity in molecular interactions?
It influences the polarity of molecules, affecting properties such as solubility, melting points, and boiling points
How many electron pairs are counted in the VSEPR theory?
Both bonding and lone pairs
What is the purpose of visualizing molecular shapes in 3D?
To better understand the arrangement of atoms in space
What is the general formula for a molecule with 2 bonding pairs and 2 lone pairs around the central atom?
AX₂E₂
What is the result of the interaction between the repulsive force between electrons and the attractive force between nucleus and electrons?
Bond formation
What determines the basic geometry of a molecule according to VSEPR theory?
The number of electron pairs around the central atom
What is the shape of a molecule with 6 bonding pairs around the central atom?
Octahedral
What is the importance of VSEPR theory in determining molecular properties?
All of the above
How many steps are involved in predicting the molecular shape using VSEPR theory?
4
What is the primary reason why atoms form bonds?
To achieve a more stable electron configuration
What is the result of the interaction between the repulsive force between electrons and the attractive force between nucleus and electrons?
Bond formation
What is the purpose of Lewis Diagrams?
To represent the valence electrons around an atom's chemical symbol
What is the characteristic of a covalent bond?
Pairs of electrons are shared between atoms
What determines the type of covalent bond formed between two atoms?
The number of pairs of electrons shared between atoms
What is the importance of molecular shape?
It determines how molecules interact and react with other molecules
What is a dative covalent bond?
A type of covalent bond where both electrons in the bond come from the same atom
What is the result of the interaction between the repulsive force between nuclei and the attractive force between electrons and nucleus?
Bond formation
What is the electronegativity difference range for a weak polar covalent bond?
0.1 to 1.1
What is the result of unequal sharing of electrons between atoms in a bond?
A polar covalent bond
Which type of bond has a complete transfer of electrons?
Ionic bond
What is the primary factor that determines the molecular polarity of a molecule?
All of the above
What is the physical property affected by molecular polarity?
Melting and boiling points
What is the term for the distance between the nuclei of two adjacent atoms when they form a bond?
Bond length
What is the term for the amount of energy required to break a bond between two atoms?
Bond energy
What type of bond is formed when the electronegativity difference between two atoms is 0?
Non-polar covalent bond
Which type of molecule has an uneven distribution of charges?
Polar molecule
What is the result of strong intermolecular forces between molecules?
Higher melting and boiling points
Which of the following factors leads to stronger bonds between atoms?
Smaller atom size
What is the primary force responsible for bond formation?
Attractive force between nucleus and electrons
What is the energy minimum point where the bond forms?
Where the attractive and repulsive forces balance
What is the term for the energy required to break a bond between two atoms?
Bond energy
What is the force that occurs between an ion and a polar molecule?
Ion-dipole force
What is the type of intermolecular force responsible for the attraction between non-polar molecules?
Induced dipole force
What is the result of the interaction between the repulsive force between electrons and the attractive force between nucleus and electrons?
Bond formation
What is the characteristic of a dipole-dipole force?
Occurs between two polar molecules
What is the term for the forces that act between molecules?
Intermolecular forces
What is the type of intermolecular force responsible for the relatively strong intermolecular force between water molecules?
Hydrogen bonding
What is the primary reason why water molecules attract ions?
Partially positive and negative charges
Which type of intermolecular force occurs between an ion and a non-polar molecule?
Ion-induced dipole force
What determines the direction of the magnetic field lines around a current-carrying wire?
The direction of the current flow
What is the result of the interaction between the partially positive and negative charges in water molecules?
Dissolution of ions
What is the role of water in biological functions?
To transport nutrients, gases, and waste products
What is the phrase that summarizes the principle of solubility?
Like dissolves like
What is the characteristic of a polar molecule?
Having a permanent dipole
What determines the strength of the magnetic field around a current-carrying wire?
The strength of the current
What is the result of the interaction between water molecules and non-polar molecules?
Weak intermolecular forces
What is the visual representation of the magnetic field around a current-carrying wire?
Concentric circles
Which type of intermolecular force occurs between a polar molecule and a non-polar molecule?
Dipole-induced dipole force
What is the primary reason for the relatively strong intermolecular force between water molecules?
Hydrogen bonds
What is the result of strong intermolecular forces between molecules?
Higher melting and boiling points
What affects the phase of matter?
Intermolecular forces
What is the unique property of water that allows it to absorb a lot of energy before its temperature changes significantly?
High specific heat
What is the result of increasing the number of carbon atoms in organic compounds like alkanes?
Higher melting and boiling points
What is the primary reason why water molecules attract ions?
Hydrogen bonds
What is the type of intermolecular force responsible for the relatively strong intermolecular force between water molecules?
Hydrogen bond
What is the result of weak intermolecular forces between molecules?
Lower melting and boiling points
What is the characteristic of a polar molecule?
It has a bent or angular shape
What is the primary function of water's high specific heat in the Earth's climate?
To regulate the Earth's temperature by storing heat during the day and releasing it at night
What is the reason behind water's ability to absorb and store heat energy?
The vibrational and rotational movements of water molecules
What is the significance of water's high melting and boiling points?
They allow water to exist as a liquid over a wide range of temperatures
What is the importance of water's high heat of vaporization in regulating body temperature?
It provides a cooling effect when sweat evaporates from the skin
Why is ice less dense than liquid water?
Because of the open hexagonal structure of ice
What is the result of the unique property of water's solid phase being less dense than its liquid phase?
It provides a habitat for aquatic life under the frozen surface of water bodies
What is the importance of water's ability to absorb and store heat energy in biological systems?
It maintains stable temperatures within organisms
What is the reason behind water's ability to dissolve a wide range of substances?
Its polarity
What is the term for the process by which water molecules surround ions in solution?
Hydration
What is the significance of water's ability to absorb and store heat energy in the Earth's climate?
It helps to moderate the Earth's climate by storing heat during the day and releasing it at night
What is the unit of measurement for electrical energy consumed by a device?
Kilowatt-hours
To convert power from watts to kilowatts, you should:
Divide by 1000
To calculate the cost of running an appliance, you should:
Multiply the power rating by the time in hours and then multiply by the cost per kilowatt-hour
What is the benefit of understanding the principles of electrical power and energy?
It helps in designing and managing electrical circuits effectively
How do you convert time from minutes to hours?
Divide by 60
What is the formula to calculate the cost of running an appliance?
Cost = Power (kW) × Time (hours) × Cost per kWh
What is the direction of the magnetic field lines when the Right Hand Rule is applied to a loop?
Out of the loop
What is the characteristic of the magnetic field inside a solenoid?
Strong and uniform
What is the purpose of electromagnets?
To maximize the magnetic field strength
What is the effect of power lines on the environment?
They pose a threat to certain bird species
What is the formula for magnetic flux?
φ = B A cos θ
What is Faraday's Law of Electromagnetic Induction?
The induced emf is proportional to the rate of change of magnetic flux
What is the direction of the induced current in a conductor?
It opposes the change in magnetic flux
What is the unit of magnetic flux?
Weber
What is the effect of a stationary magnet on a wire?
It does not generate a voltage across the wire
What is the purpose of markers on power lines?
To make the power lines more visible to birds
What is the direction of the induced current in a coil when the south pole of a magnet is moving towards the coil?
The current flows in such a way to create a magnetic field opposing the south pole’s field
What is the purpose of Lenz's Law?
To ensure that the direction of the induced emf always works to counteract the change that caused it
What is the relationship between current, voltage, and resistance in a circuit?
I = V/R
What is the characteristic of an ohmic conductor?
The resistance is constant when the voltage is varied across it or the current through it is increased
What is the purpose of electromagnetic induction?
To convert mechanical energy into electrical energy
What is the total resistance in a series circuit?
The sum of the resistances of all the resistors
What is the characteristic of a non-ohmic conductor?
The resistance changes with temperature
What is self-induction?
The process of inducing a voltage in a coil when the current in the coil changes
What is the purpose of a solenoid?
To generate a magnetic field when a current flows through it
What is the effect of increasing the number of loops in a solenoid?
The magnetic field strength increases
What is the effect of increasing the current through a circuit on the power dissipated?
The power dissipated increases
What is the total resistance in a series circuit?
The sum of the individual resistances
What is the formula for electrical energy?
E = P × t
What is the unit of measurement for power?
Watts
What is the relationship between the voltage and current in a circuit?
The voltage is directly proportional to the current
What is the formula for power in terms of current and resistance?
P = I^2 × R
What is the total current in a parallel circuit?
The sum of the individual currents
What is the purpose of a battery in a circuit?
To convert chemical energy into electrical energy
What is the formula for total resistance in a parallel circuit?
1/R_p = 1/R_1 + 1/R_2 + ... + 1/R_n
What is the relationship between the power and energy in a circuit?
Power is the rate of energy transfer
Watter eenheid word gebruik om die hoeveelheid energie te meet wat 'n elektriese toestel verbruik?
Kilowatt-uur
Wat is die formule om die totale hoeveelheid energie te bereken wat 'n elektriese toestel verbruik?
E = P × t
Waarom vorm atome chemiese bindings?
Om 'n meer stabiele elektronkonfigurasie te kry
Wat is die naam van die diagram wat gebruik word om die valenselektrone van 'n atoom voor te stel?
Lewis-diagram
Watter tipe chemiese binding word gevorm wanneer twee atome 'n paar elektrone deel?
Kovalente binding
Wat is die naam van die tipe kovalente binding waar twee pare elektrone gedeel word?
Dubbelsbinding
Wat is die eenheid van elektrisiteitkoste?
Kilowatt-uur
Watter faktor bepaal die hoeveelheid energie wat 'n elektriese toestel verbruik?
Die tyd dat die toestel gebruik word
Watter eenheid word gebruik om die hoeveelheid energie te meet wat 'n elektriese toestel verbruik per uur?
Kilowatt-uur
Watter vorm het die magnetiese veldlyn rondom 'n reguit draad?
Konsentriese sirkels
Watter is die rigting van die magnetiese veldlyn by 'n stroomdraende lus?
Die rigting van die stroom
Wanneer 'n suidpool van 'n magnete nader aan 'n lus, wat gebeur met die induksie-stroom?
Die induksie-stroom generer 'n magnetiese veld wat die toename in die magnetiese veldsterkte teenstaan.
Watter het 'n solenoïed in gemeen met 'n staafmagneet?
Dit het 'n noord- en suidpool
Watter is die doel van elektromagnete?
Om 'n sterk magnetiese veld te genereer en te beheer
Watter soort kondukteerder het 'n grafiek van stroom teenoor spanning wat nie 'n reguit lyn is nie?
Niet-Ohmiese kondukteerder
Waarom is die rigting van die induksie-stroom belangrik?
Omdat dit die verandering in die magnetiese veldsterkte beïnvloed.
Watter van die volgende is 'n voorbeeld van 'n serie- verbinding?
Batterye in serie
Watter het die omgewing beïnvloed deur kraglyne?
Groot voëls
Wat is die naam van die wet wat die verhouding tussen Emily,-spanning en weerstand beskryf?
Ohm se Wet
Watter is die eenheid van magnetiese vloei?
Weber
Waar word Faraday se Wet gebruik?
In elektrisiteitsgenerators
Watter is die formule om die totale weerstand in 'n parallel-verbinding te bereken?
1/R_p = 1/R_1 + 1/R_2 + 1/R_3 + … + 1/R_n
Wat is die doel van die regterhandreël?
Om die rigting van die induksie-stroom te bepaal
Watter is die eenheid van elektriese krag?
Watt (W)
Watter is die wet van elektromagnetiese induksie?
Faraday se wet
Watter is die formule om die krag in 'n elektriese sirkuit te bereken?
P = I × V
Watter is die gevolg van 'n veranderende magnetiese veld?
Elektrisiteit word gegenereer
Wat is die naam van die wet wat die induksie-stroom se rigting beskryf?
Lenz se Wet
Watter is die naam van die wet wat die verhouding tussen spanning, stroom en weerstand in 'n elektriese sirkuit beskryf?
Ohm se wet
Watter is die doel van Michael Faraday se eksperimente?
Om die beginsel van elektromagnetiese induksie te ontdek
Waarom is die induksie-stroom belangrik?
Omdat dit die verandering in die magnetiese veldsterkte beïnvloed
Watter is die verhouding tussen die stroom en spanning in 'n serie-verbinding?
Die stroom is dieselfde deur alle komponente
Wat is die doel van self-induksie?
Om die verandering in die magnetiese veldsterkte te beperk
Watter is die werkingswyse van 'n solenoïed?
Dit word gebruik om 'n sterk magnetiese veld te genereer
Watter is die verhouding tussen die stroom en spanning in 'n parallel-verbinding?
Die spanning is dieselfde oor alle komponente
Waar word Ohm se Wet gebruik?
In elektrisiteitskringe
Wat is die verhouding tussen Emily, spanning en weerstand?
I = V/R
Watter is die doel van 'n energiebron in 'n elektriese sirkuit?
Om chemiese potensiële energie om te skakel na elektriese energie
Watter is die eenheid van werk?
Joule (J)
Watter molekulêre vorm het 'n sentrale atoom met 3 binding paar en 1 alleenstaande paar?
Trigonal piramidêr
Watter is die naam van die teorie wat gebruik word om die vorm van molekules te voorspel?
VSEPR-teorie
Watter is die belangrikheid van molekulêre vorm in chemie?
Dit beïnvloed die eienskappe van 'n stof soos smeltpunt en kookpunt
Watter is die naam van die konsep wat die vermoë van 'n atoom om elektrone na hom toe te trek, beskryf?
Elektronegatiwiteit
Watter is die gevolg wanneer 'n molekule 'n dative kovalente binding het?
Die molekule het 'n kovalente binding waar beide elektrone van dieselfde atoom kom
Watter is die belangrikheid van elektronegatiwiteit in chemie?
Dit bepaal hoe atome in 'n molekule interakteer
Watter is die naam van die proses waarvolgens 'n atoom elektrone ontvang en 'n binding met 'n ander atoom vorm?
Kovalente binding
Watter is die toestand van 'n molekule met 'n sentrale atoom wat 4 binding paar en 0 alleenstaande paar het?
Tetraëdries
Watter is die naam van die tabel wat die verskillende molekulêre vorme op basis van die aantal binding paar en alleenstaande paar rondom die sentrale atoom, lys?
Molekulêre vormtabel
Watter is die naam van die diagram wat gebruik word om die valenselektrone om 'n atoom weer te gee?
Lewisdiagram
Watter tipe bond word gevorm wanneer die elektronegatiwiteitverskil tussen twee atome 0 is?
Niet-polar kovalente bond
Watter faktor beïnvloed die sterkte van 'n bond?
Bond energie
Watter tipe molekule het een einde met 'n effens positiewe lading en een einde met 'n effens negatiewe lading?
Polar molekule
Watter eienskap van 'n molekule beïnvloed sy fisiese eienskappe soos smeltpunt en kookpunt?
Molekulêre polariteit
Watter is die doel van die berekening van die elektronegatiwiteitverskil tussen twee atome?
Om die tipe bond te bepaal
Watter is die naam van die wetenskaplike wat die konsep van elektronegatiwiteit ingestel het?
Linus Pauling
Watter is die karakteristiek van 'n niet-polar molekule?
Een ewe verdeling van laaiings
Watter is die verhouding tussen elektronegatiwiteit en bond type?
Elektronegatiwiteit beïnvloed die tipe bond
Watter is die term vir die afstand tussen die kern van twee aangrensende atome wanneer hulle 'n bond vorm?
Bond lengte
Watter is die fisiese eienskap wat deur molekulêre polariteit beïnvloed word?
Al hierdie
Wanneer 'n elektriese stroom deur 'n draad vloei, wat gebeur rondom die draad?
Daar ontstaan 'n magnetisme veld rondom die draad.
Watter reël word gebruik om die rigting van die magnetisme veld rondom 'n draad te bepaal?
Die Regterhandreël
Hoe word die sterkte van die magnetisme veld rondom 'n draad beïnvloed?
Deur die sterkte van die stroom
Wat word gebruik om die rigting van die magnetisme veld lyne rondom 'n draad te verteenwoordig?
ʼn Oop en geslote sirkel
Wat is die vorm van die magnetisme veld lyne rondom 'n draad?
Sirkels
Waar word die magnetisme veld lyne digter by die draad?
Nader aan die middel van die draad
Wat is die rede waarom die kompasnaald deflekteer wanneer dit naby 'n draad geplaas word?
Omdat die magnetisme veld om die draad die kompasnaald deflekteer
Hoe word die magnetisme veld lyne rondom 'n draad visueel voorgestel?
Deur sirkels rondom die draad te teken
Wat is die rede waarom water 'n goeie oplossing is vir baie stowwe?
Water se molekule het 'n gedeeltelik positiewe waterstofatoom en 'n gedeeltelik negatiewe suurstofatoom.
Watter tipe verbindings is verantwoordelik vir die vermogen van water om baie stowwe op te los?
Waterstofbindings
Waarom los nie-polêre stowwe nie goed in water op?
As gevolg van die gebrek aan aantrekking tussen watermolekule en nie-polêre stowwe.
Watter faktore beïnvloed die sterkte van 'n chemiese binding?
Die grootte van die atome, die lengte van die binding en die aantal bindings
Wanneer vorm 'n chemiese binding tussen twee atome?
Wanneer die minimumenergiepunt bereik word
Wat is die belangrikste rol van water in biologiese funksies?
Om stowwe op te los en te transporteer.
Watter grafiese voorstelling wys die verandering in energie wanneer atome nader kom?
Een grafiek met 'n energieminimumpunt
Hoe word die beginsel van oplosbaarheid saamgevat?
Soos-gelyk los soos-gelyk.
Waarom is water 'n belangrike komponent in omgewingsprosesse?
Omdat water 'n belangrike rol speel in die verspreiding van voedingstowwe in die grond.
Watter intermolekulêre krag is verantwoordelik vir die relatief sterke intermolekulêre krag tussen watermolekules?
Dipool-dipoolkrag
Watter faktore beïnvloed die fisiese eienskappe van 'n stof?
Die intermolekulêre kragte en die molecuulgewig
Watter soort intermolekulêre krag vind plaas tussen 'n ion en 'n polêre molekuul?
Ion-dipoolkrag
Watter is die eenheid van bindingenergie?
Joule
Watter soort intermolekulêre krag is verantwoordelik vir die swakke intermolekulêre krag tussen nie-polêre molekules?
Geïnduseerde dipoolkrag (Londen-dispersiekrag)
Watter is die naam van die krag wat tussen atome optree?
Chemiese binding
Watter is die karakteristiek van 'n polêre molekuul?
Die elektronegatiwiteit van die atome is verskillend
Watter tipe intermolekulêre krag veroorsaak dat 'n polêre molekuul 'n dipool in 'n nie-polêre molekuul induseer?
Dipool-induseerde dipoolkrag
Watter eienskap van water veroorsaak dat dit 'n lot energie kan absorbeer voordat sy temperatuur merkbaar verander?
Spesifieke Hitte
Watter faktore beïnvloed die sterkte van 'n intermolekulêre krag?
Al die bogenoemde
Watter tipe binding vind plaas tussen molekules?
Intermolekulêre binding
Watter eienskap van water veroorsaak dat dit 'n belangrike rol speel in die regulering van omgewingtemperature?
Spesifieke hitte
Watter tipe intermolekulêre krag veroorsaak dat watermolekules aan mekaar klou?
Waterstofbindings
Watter is die gevolg van sterk intermolekulêre krage tussen molekules?
Vastestof
Watter is die rede waarom groter molekules swakker intermolekulêre krage het?
Molekulêre grootte
Watter is die gevolg van swak intermolekulêre krage tussen molekules?
Gas
Watter is die verband tussen molekulêre grootte en intermolekulêre krag?
Groter molekules het sterk intermolekulêre krage
Watter eienskap van water help om stabiele temperature binne organisme te handhaaf?
Hoë spesifieke warmtekapasiteit
Waarom kan water infrarooi-straling absorbeer?
Weens die vibrasie- en rotasiebewegings van watermolekules
Watter faktor is verantwoordelik vir die hoë smeltpunt en kookpunt van water?
Sterke waterstofbindings tussen watermolekules
Waarom is die hitte van verdampping van water so hoog?
Weens die sterke waterstofbindings tussen watermolekules
Waarom is water minder dig in sy vaste fase as in sy vloeistof-fase?
Weens die open hexagonale struktuur van ys
Waarom is water 'n goeie oplossing vir baie ioniese en polêre stowwe?
Weens die polêre aard van watermolekules
Wat is die gevolg van die sterke intermolekulêre kragte tussen watermolekules?
Dat water 'n hoog viskositeit het
Waarom is die absorpsie van infrarooi-straling deur water belangrik vir die aarde se klimaat?
Weens die vermoë om warmte-energie te vang en te berg
Watter eienskap van water is verantwoordelik vir die feit dat ys dryf op water?
Die lae dichtheid van water in sy vaste fase
Waarom is water belangrik vir biologiese funksies?
Weens die vermoë om as 'n oplossing vir baie stowwe te dien
Wanneer 'n elektriese stroom deur 'n draad vloei, wat word gegenereer?
Magnetiste veld
Waarom word die naald van 'n kompas afgebreek wanneer dit naby 'n stroomvoerende draad geplaas word?
As gevolg van die magnetiese veld
Hoe word die rigting van die magnetiese veldlyn rondom 'n stroomvoerende draad bepaal?
Deur die Regterhandrel
Wat is die verhouding tussen die sterkte van die stroom en die sterkte van die magnetiese veld?
Die sterkte van die magnetiese veld is direk evenredig met die sterkte van die stroom
Hoe word die magnetiese veldlyn rondom 'n stroomvoerende draad visueel voorgestel?
Deur konsentriese cirkels rondom die draad te teken
Wat is die simbool vir 'n pyl wat uit die bladsy kom?
( \odot )
Wanneer kyk ons na die magnetiese veldlyn van die sy, hoe lyk hulle?
Hulle lyk soos parallelle lyne
Wat is die rede waarom die magnetiese veldlyn dikker is naby die draad?
As gevolg van die nabyheid aan die draad
Watter is die rigting van die magnetiese veldlyne rondom 'n reguit draad wat elektrisiteitarry voer?
Die veldlyne loop konsentriese sirkels rondom die draad
Watter is die naam van die wet wat die verband tussen die verandering in 'n magnetiese veld en die induksie van 'n elektriese spanning beskryf?
Faraday se wet van elektromagnetiese induksie
Watter is die eenheid van magnetiese flux in die SI-stelsel?
Weber
Watter is die doel van die regthandreël in die bepaling van die rigting van die magnetiese veld?
Om die rigting van die magnetiese veld te bepaal
Watter is die effek van 'n verandering in die magnetiese veld op 'n draad?
Een elektriese spanning word gegenereer
Watter is die naam van die toestel wat 'n magnetiese veld gegenereer wanneer 'n elektriese stroom deur 'n spiraal van draad vloei?
Elektromagneet
Watter is die redes waarom die magnetiese veld van 'n kraglyn bekommernis vir die omgewing kan veroorsaak?
Die veld kan vogelbevolking beïnvloed
Watter is die terme wat gebruik word om die sterkte van 'n magnetiese veld te beskryf?
Flux en veldsterkte
Watter is die toepassing van electromagnete in die praktyk?
Al die bovengenoemde opsies
Watter is die rede waarom die magnetiese veld van 'n solenoid anders is as die van 'n enkele lus van draad?
Die veld is uniformer
Watter eenheid is gebruik om die elektromotoriese krag in 'n stroomkring te meet?
Voll
Watter is die naam van die wet wat die verband tussen elektriese stroom, spanning en weerstand in 'n stroomkring beskryf?
Wet van Ohm
Watter is die doel van 'n self-induktiewe spoel?
Om 'n spanning te induksie
Watter is die naam van die wet wat die verband tussen die induksie van 'n elektriese veld en die verandering in die magnetiese veld beskryf?
Wet van Faraday
Watter is die richting van die induksie-stroom in 'n stroomkring wanneer 'n suidpool van 'n magneet naderkom?
Die induksie-stroom vloei in die teenoorgestelde rigting van die magneet
Watter is die naam van die wet wat die verband tussen die induksie van 'n elektriese veld en die verandering in die magnetiese veld beskryf?
Wet van Faraday
Watter is die doel van 'n elektriese generator?
Om meganiese energie in elektriese energie om te skakel
Watter is die eenheid vir die meting van die magnetiese veldsterkte?
Tesla
Watter is die naam van die wet wat die verband tussen die induksie-stroom en die verandering in die magnetiese veld beskryf?
Wet van Lenz
Watter is die doel van 'n elektriese transformator?
Om die spanning van 'n stroomkring te verander
Watter tipe kondensatore gehoorsaam nie aan Ohm se Wet nie?
Nie-ohmiese kondensatore
Wanneer is die totale weerstand in 'n seriekring die som van die weerstande van al die reisistors?
Altyd
Wat is die formule vir die berekening van krag in 'n elektriese kring?
P = I * V
Watter is die verhouding tussen krag en stroom in 'n elektriese kring?
Krag is direk proporsioneel tot die stroom
Watter is die rol van 'n battery in 'n elektriese kring?
Om chemiese potensiële energie in elektriese energie om te skakel
Watter is die formule vir die berekening van die totale weerstand in 'n parallelkring?
1 / R_p = 1 / R_1 + 1 / R_2 + 1 / R_3 + ... + 1 / R_n
Watter is die kenmerk van 'n nie-ohmiese kondensator?
Die weerstand verander met die temperatuur
Watter is die voorwaarde vir die vorming van 'n elektriese kring?
Dat daar 'n bron van energie is
Watter is die verhouding tussen die krag en die spanning in 'n elektriese kring?
Krag is direk proporsioneel tot die spanning
Watter is die resultaat van die wisselwerking tussen die afstootende krag tussen elektrone en die aantrekkende krag tussen die kern en elektrone?
Die energie-minimumpunt waar die bond vorm
Wanneer 'n atoom 'n elektonpaar in 'n molekule ontvang, hoe beïnvloed dit die molekule se eienskappe?
Dit verhoog die smeltpunt en kookpunt.
Waarom is die begrip van elektronegatiwiteit belangrik in chemie?
Om die aard van bindings tussen atome te bepaal.
Hoe word die vorm van 'n molekule bepaal?
Deur die aantal elektonpare op die sentrale atoom.
Waarom is die vorm van 'n molekule belangrik?
Omdat dit die molekule se eienskappe beïnvloed.
Watter faktor beïnvloed die sterkte van 'n binding?
Die elektronegatiwiteit van die atome.
Watter tipe binding word gevorm wanneer die elektronegatiwiteitverskil tussen twee atome nul is?
Kovalente binding.
Hoe word die polariteit van 'n molekule bepaal?
Deur die elektronegatiwiteit van die atome.
Watter is die belangrikste rede waarom molekules intermolekulêre kragte het?
Om die molekule se stabiliteit te verhoog.
Watter tipe verbinding word gevorm wanneer die elektronegatiwiteitsverskil tussen twee atome 1.5 is?
Sterk polêre kovalente verbinding
Watter is die gevolg van swak intermolekulêre kragte tussen molekules?
Die molekule se smeltpunt en kookpunt verlaag.
Watter faktor beïnvloed die sterkte van 'n verbinding?
Die elektronegatiwiteit van die atome
Watter is die belangrikste rede waarom watermolekules elektroneutraliteitsterkte het?
Omdat water 'n polar molecule is.
Wat is die naam van die wetenskaplike wat die konsep van elektronegatiwiteit ingelei het?
Linus Pauling
Wat is die waarskynlikheid van 'n nie-polêre molecule?
Dat dit 'n eweredige verdeling van ladings het
Watter eenheid word gebruik om die hoeveelheid energie te meet wat oorgedra is?
Kilowatt-uur
Watter tipe intermolekulêre krag kom voor tussen 'n polêre molecule en 'n nie-polêre molecule?
Induktiewe krag
Wat is die effek van sterk intermolekulêre krage tussen molekules?
Dat dit die smeltpunt en kookpunt verhoog
Wat is die verband tussen die krag en die hoeveelheid energie wat oorgedra is?
E = P x t
Waarom vorm atome bindings?
Om 'n volle valenselektron skuif te bereik
Watter faktor beïnvloed die oplosbaarheid van 'n molecule in 'n spesifieke oplosmiddel?
Die polêre aard van die molecule
Watter soort binding word gevorm wanneer twee atome elektronpare deel?
Kovalente binding
Wat is die waarskynlikheid van 'n polêre molecule?
Dat dit een kant met 'n effens positiewe lading en een kant met 'n effens negatiewe lading het
Watter tipe verbinding word gevorm wanneer die elektronegatiwiteitsverskil tussen twee atome 0.5 is?
Swak polêre kovalente verbinding
Watte dieLewis-diagram gebruik word vir?
Om die binding tussen atome te wys
Waarom is die elektronegabeit belangrik in die bepaling van die aard van bindings tussen atome?
Omdat dit die polariteit van die binding bepaal
Watter tipe intermolekulêre krag is verantwoordelik vir die relatief sterk intermolekulêre krag tussen watermolekules?
Hydrogende krag
Watter is die verband tussen die krag en die tyd?
P = E / t
Waarom is die verstandhouding van elektrisiteit belangrik in die berekening van die koste van elektrisiteit?
Omdat dit die koste per kilowatt-uur bepaal
Watter soort binding word gevorm wanneer twee atome drie elektronpare deel?
Drievoudige binding
Waarom is die verstandhouding van elektrisiteit belangrik in die ontwerp van elektrisiteitskringe?
Omdat dit die doeltreffendheid van die elektrisiteitskring bepaal
Wat is die verband tussen die lengte van 'n chemiese binding en die sterkte van die binding?
Korter bindingslengtes lei tot sterker bindings
Wanneer twee atome nader aan mekaar beweeg, wat is die eerste effek op die energie van die stelsel?
Die energie van die stelsel neem af
Watter soort intermolekulêre kragTREEF tussen 'n ion en 'n polêre molekuul?
Ion-dipoolkrag
Watter soort chemiese binding word gevorm wanneer die elektronegatiwititeitverskil tussen twee atome baie groot is?
Ioniese binding
Watter is die naam van die krag wat tussen twee atome.optreeanneer hulle nader aan mekaar beweeg?
Aantrekkingskrag
Watter is die naam van die energie-minimumpunt waar die binding gevorm word?
Energie-minimumpunt
Watter soort intermolekulêre kragTREEF tussen twee polêre molekule?
Dipool-dipoolkrag
Watter is die rede waarom koolstofmonoksied (CO) 'n korte bindingslengte het?
Die atome is klein
Watter is die naam van die krag wat tussen twee molekule optree, en wat die fisiese eienskappe van 'n stof beïnvloed?
Intermolekulêre krag
Watter is die rede waarom watermolekule 'n sterke intermolekulêre krag het?
Die watermolekuul het 'n polêre karakter
Waarom is water 'n ideale oplossing vir baie stowwe?
Omdat dit 'n hoë polariteit het
Watter soort verbindinge word gevorm tussen watermolekules en niet-polaire molekules?
Geen verbindinge
Waarom is water belangrik vir biologiese funksies?
Omdat dit voedingstowwe, gasse en afvalprodukte kan oplos
Watter prinsipe word gebruik om die verband tussen die oplossing en die oplosbaarheid te beskryf?
Like dissolves like
Wat is die gevolg van die wisselwerking tussen watermolekules en ioniese stowwe?
Die ioniese stowwe word opgelos
Watter rol speel water in omgewingprosesse?
Al die bogenoemde
Watter tipe intermolekulêre krag is verantwoordelik vir die relatief sterk intermolekulêre krag tussen watermolekules?
Waterstofbindings
Watter eienskap van water maak dit moontlik vir groot liggame soos oseane en mere om 'n groot hoeveelheid energie op te neem sonder groot temperatuurfluktuasies?
Hoë spesifieke warmte
Watter faktor beïnvloed die sterkte van intermolekulêre kragte tussen molekules?
Grootte van die molekule
Watter proses is verantwoordelik vir die vorming van 'n dipool in 'n nie-polaire molekule?
Polarisasie
Watter is 'n voorbeeld van 'n stof wat 'n relatief sterk intermolekulêre krag het as gevolg van waterstofbindings?
Water
Watter is die resultaat van swak intermolekulêre kragte tussen molekules?
Gas
Watter is die naam van die tipe intermolekulêre krag wat optree tussen 'n polêre molekule en 'n nie-polaire molekule?
Dipool-geïnduseerde dipoolkrag
Watter is die effek van toenemende die aantal koolstofatome in organiese verbindinge soos alkane?
Toenemende smeltpunt
Watter is die verband tussen die sterkte van intermolekulêre kragte en die fase van 'n stof?
Sterk intermolekulêre kragte lei tot 'n vastestof
Watter is die eienskap van water wat dit moontlik maak om 'n groot hoeveelheid energie op te neem sonder groot temperatuurfluktuasies?
Hoë spesifieke warmte
Waarom kan water 'n groot hoeveelheid energie absorbeer voordat sy temperatuur verander?
As gevolg van sy hoë warmtekapasiteit
Watter eienskap van water is verantwoordelik vir sy rol as 'n klimaatbuffer?
Sy vermoë om infrarooi-straling te absorbeer
Hoe word water se smeltpunt en kookpunt beïnvloed?
Deur die sterk waterstofbindings tussen watermolekules
Waarom is water 'n uitstekende oplossing vir many ione en polêre stowwe?
Omdat water 'n polêre molekuul is
Waarom is die warmte van verdampering van water belangrik vir die regulerende van lyfstemperatuur?
Omdat dit help om die lyfstemperatuur te verlaag
Wat is die gevolg van die sterk waterstofbindings tussen watermolekules?
Dat water se smeltpunt en kookpunt hoog is
Hoe beïnvloed die waterstofbindings tussen watermolekules die struktuur van ys?
Dat die struktuur van ys open en hexagonaal is
Wat is die gevolg van die open, hexagonale struktuur van ys?
Dat ys swem wanneer dit vorm
Waarom is die vermoë van water om infrarooi-straling te absorbeer belangrik vir die omgewing?
Omdat dit help om die omgewing se klimaat te modereer
Waarom is die hoogte van die warmte van verdampering van water belangrik vir die omgewing?
Omdat dit help om die omgewing se water siklus te reguleer
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