Chemistry Quiz

Alkane = CnH2n+2 Alkyne = CnH2n-2 Not given = CnH2n+1

Statement A = On moving from left to right in a period, the chemical reactivity of elements first decreases and then increases. Statement B = The chemical reactivity of non-metals increases on going down in a group of the periodic table. True or False = A) Statements A and B are true, B) Statement A is true, but B is false, C) Statement B is true, but A is false, D) Statements A and B are false Mendeleev concentrated on = the compounds formed by the elements with hydrogen and oxygen.

Boiling and freezing points of water = 180 degrees apart on the Fahrenheit scale. 77 °F = 25 °C Not given = 20 °C

Latent heat of fusion = The heat per unit mass required to change a substance from solid into liquid at the same temperature and pressure. Vaporisation = Not given Regelation = Not given Sublimation = Not given

Preventing food material from getting oxidised = Not given Not given = Hydrogen and Oxygen

INCORRECT match = Carbon and Hydrogen Not given = Hydrogen and Oxygen

4 = Not given 22 = Not given 2 = Not given 0 = Not given

46. The boiling and freezing points of water = 180 degrees apart on the Fahrenheit scale.
47. _____ is the heat per unit mass required = Latent heat of fusion 48.Among chemical properties, Mendeleev concentrated on = the compounds formed by the elements with hydrogen and oxygen.
48. 77 °F is equal to ________. = 25 °C

S = Has a total of 3 shells with 8 electrons in the last orbit Al = Reacts vigorously with cold water Ar = Is a noble gas Na = Is an Alkali metal

Ce and La = Placed with the lanthanides Fe and Se = Placed with the transition metals Co and Ni = Placed with the transition metals Mn and As = Placed with the metalloids

NO2 = Is a toxic gas N2 O5 = Is a strong oxidizing agent NO = Is a colorless gas N2O = Is also known as Laughing Gas

Sodium = Reacts vigorously with cold water Chlorine = Reacts vigorously with Sodium Water = Does not react with Sodium Iodine = Sublimes

Sulphur = Is a polyatomic element Argon = Is a noble gas Oxygen = Is a diatomic element Al = Is a metal

Drying of wet clothes = Physical change Melting of ice = Physical change Sublimation of Iodine = Physical change Butter turning rancid = Chemical reaction

Tenth element = Resembles the ninth element First element = Resembles the third element Fourth element = Resembles the first element Ninth element = Resembles the tenth element

The number of shells increases = False Valence electrons decrease = True The number of shells decreases = False Atomic size decreases = True

High melting point = Makes nichrome suitable for high-temperature wires Maximum energy level = Highest energy level an electron can occupy Number of subshells = Dependent on the principal quantum number (n) Number of orbitals per subshell = Fixed for each subshell (s, p, d, f)

A molecule of a compound = Correct usage, as molecules make up a compound An atom of a compound = Incorrect usage, as atoms make up a molecule An atom of an element = Correct usage, as elements are formed from atoms A mole of an element = Amount of element containing 6.022 × 10^23 atoms

s subshell = Can hold up to 2 electrons p subshell = Can hold up to 6 electrons d subshell = Can hold up to 10 electrons f subshell = Can hold up to 14 electrons

n (principal quantum number) = Defines the energy level of an electron l (azimuthal quantum number) = Defines the subshell of an electron m (magnetic quantum number) = Defines the orbital of an electron s (spin quantum number) = Defines the spin of an electron

Nichrome = High-temperature wires and heating elements Copper = Electrical wiring and circuits Silicon = Semiconductors and computer chips Carbon = Structural materials and nanotubes

Nichrome = High melting point and resistant to oxidation Copper = High electrical conductivity and malleability Silicon = Semiconductor properties and high thermal conductivity Carbon = High strength-to-weight ratio and high thermal conductivity

Mole = Amount of substance containing 6.022 × 10^23 particles Molecule = Smallest unit of a compound that retains its properties Atom = Smallest unit of an element that retains its properties Orbital = Region around the nucleus where an electron is likely to be found

Hair dryers and toasters = Nichrome heating elements Electrical circuits and wiring = Copper conductors Computer chips and solar cells = Silicon semiconductors Structural materials and nanotubes = Carbon-based materials

25 g = 5% by mass 1.25 g = 50% by mass 125 g = 20% by mass 50 g = 10% by mass

Bleaching powder = Chlorine gas Baking powder = Oxygen Baking soda = Nitrogen Washing powder = Hydrogen

Carbon = Forms large molecules with itself Aluminium = Does not form large molecules with itself Hydrogen = Forms small molecules with itself Nitrogen = Does not form large molecules with itself

CO2 = Generated in a biogas plant CO = Not generated in a biogas plant H2S = Generated in a biogas plant CH4 = Generated in a biogas plant

configuration = 17

Kelvin = Celsius + 273 = Correct conversion formula Kelvin = Celsius - 273 = Incorrect conversion formula Kelvin = Celsius * 273 = Incorrect conversion formula Kelvin = Celsius / 273 = Incorrect conversion formula

Atomic number = Number of protons in an atom's nucleus Atomic weight = Average mass of an atom of an element Valence electrons = Electrons in the outermost energy level Number of shells = Energy levels in an atom

H2O2 = A reducing agent Cl2 = A base

Mendeleev = Periodic table based on atomic masses Markovnikov = Rules for addition reactions Zelinsky = Russian chemist, unknown contribution Zaitsev = Russian chemist, unknown contribution

He = Lighter than air H2 = Less reactive than D Li = First metallic element in the Modern Periodic Table Na = More reactive than D

Bio-gas = Contains up to 80% methane Lead Nitrate = Produces reddish brown gas when heated strongly H2O2 = Strong oxidising agent Cl2 = Toxic gas with a yellow-green color

H2O2 + Cl2 → 2HCl + O2 = Reaction with oxidising and reducing agents Lead Nitrate → Nitrogen dioxide = Reaction with nitrogen H2O2 → H2O + O2 = Reaction with oxygen Cl2 + H2 → 2HCl = Reaction with hydrogen

Alloy = Homogeneous mixture of two or more metals Colloidal solution = Mixture with particles between 1-100 nm Emulsion = Mixture of two or more liquids Heterogeneous mixture = Mixture with visible components

H2O2 + Cl2 → 2HCl + O2 = Hydrochloric acid and oxygen Lead Nitrate → Nitrogen dioxide = Nitrogen dioxide and oxygen H2O2 → H2O + O2 = Water and oxygen Cl2 + H2 → 2HCl = Hydrochloric acid and chlorine