Biology Chapter on Ecology and Photosynthesis
83 Questions
5 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which of the following are the reactants of photosynthesis?

  • Energy and carbon dioxide
  • Glucose and oxygen
  • Oxygen and energy
  • Carbon dioxide and water (correct)
  • Cellular respiration only occurs in animals.

    False (B)

    What two products are created by photosynthesis that are used in cellular respiration?

    Glucose and oxygen

    In a predator-prey relationship, if the prey population increases the predator population will likely ______.

    <p>increase</p> Signup and view all the answers

    Match the following ecological roles with the correct descriptions:

    <p>Producers = Create energy-rich compounds via photosynthesis Primary Consumers = Herbivores that feed on producers Secondary Consumers = Carnivores or omnivores that feed on primary consumers Tertiary Consumers = Predators at the top of the food chain</p> Signup and view all the answers

    Which of the following best describes mutualism?

    <p>Both organisms benefit. (B)</p> Signup and view all the answers

    Abiotic factors in an ecosystem include competition and disease.

    <p>False (B)</p> Signup and view all the answers

    What is the primary form of energy produced by cellular respiration?

    <p>ATP</p> Signup and view all the answers

    Which of these describes commensalism?

    <p>One organism benefits and the other remains unaffected. (B)</p> Signup and view all the answers

    The phosphorus cycle includes an atmospheric component.

    <p>False (B)</p> Signup and view all the answers

    What is the term for a non-native species that causes harm to its new environment?

    <p>invasive species</p> Signup and view all the answers

    A rapid population increase under ideal conditions is represented by a ______ growth curve.

    <p>exponential</p> Signup and view all the answers

    Match the following terms with their descriptions:

    <p>Biosphere = All living organisms on Earth Atmosphere = Gaseous layer surrounding Earth Hydrosphere = Water bodies on Earth Lithosphere = Earth's crust and landforms</p> Signup and view all the answers

    Which sequence correctly outlines the key processes of the nitrogen cycle?

    <p>Nitrogen fixation, nitrification, denitrification (C)</p> Signup and view all the answers

    Bioaccumulation refers to the increase in toxin concentration as it moves up the food chain.

    <p>False (B)</p> Signup and view all the answers

    What is the definition of carrying capacity?

    <p>The maximum population size an environment can sustainably support.</p> Signup and view all the answers

    What happens to a glass rod when it is rubbed with silk?

    <p>It loses electrons and becomes positively charged. (B)</p> Signup and view all the answers

    In a series circuit, the voltage is the same across all components.

    <p>False (B)</p> Signup and view all the answers

    What is the formula for calculating the efficiency of a device?

    <p>Efficiency (%) = (Useful Energy Output / Total Energy Input) x 100</p> Signup and view all the answers

    According to Ohm's Law, the voltage (V) is equal to the current (I) multiplied by the ______.

    <p>resistance</p> Signup and view all the answers

    Match the following energy sources with their type:

    <p>Solar = Renewable Coal = Non-Renewable Wind = Renewable Natural Gas = Non-Renewable</p> Signup and view all the answers

    A 1500 W appliance is used for 3 hours, and the cost of electricity is $0.10/kWh. What is the total cost?

    <p>$0.45 (C)</p> Signup and view all the answers

    Grounding an object causes it to become negatively charged.

    <p>False (B)</p> Signup and view all the answers

    What type of material allows electrons to flow freely?

    <p>Conductors</p> Signup and view all the answers

    What is the mass number of an atom?

    <p>The number of protons plus the number of neutrons. (B)</p> Signup and view all the answers

    Reactivity increases down Group 17 (halogens).

    <p>False (B)</p> Signup and view all the answers

    What is the charge of an anion?

    <p>negative</p> Signup and view all the answers

    A mixture that has a uniform composition throughout is considered to be ______.

    <p>homogeneous</p> Signup and view all the answers

    The density of a substance is calculated using which formula?

    <p>Density = Mass / Volume (C)</p> Signup and view all the answers

    A compound is made up of only one type of atom

    <p>False (B)</p> Signup and view all the answers

    What are the three subatomic particles?

    <p>protons, neutrons, and electrons</p> Signup and view all the answers

    Which of the following best defines an Astronomical Unit (AU)?

    <p>The average distance from Earth to the Sun (C)</p> Signup and view all the answers

    Solar eclipses are visible from anywhere on Earth where it is nighttime.

    <p>False (B)</p> Signup and view all the answers

    Name one reason why ancient cultures studied the night sky.

    <p>navigation, tracking time, or religious reasons</p> Signup and view all the answers

    The _______ is a massive system of stars, gas and dust bound together by gravity.

    <p>galaxy</p> Signup and view all the answers

    Match the following theories/concepts with their definitions:

    <p>Big Bang Theory = Explains the origin of the universe. Solar Nebula Theory = Explains the formation of the solar system. Lunar Eclipse = Occurs when Earth casts a shadow on the Moon. Solar Eclipse = Occurs when the Moon blocks sunlight to Earth.</p> Signup and view all the answers

    What is the primary cause of Earth's seasons?

    <p>Earth's axial tilt (A)</p> Signup and view all the answers

    Inner planets are primarily composed of gasses such as hydrogen and helium.

    <p>False (B)</p> Signup and view all the answers

    What is the name of the robotic arm used on the Space Shuttle?

    <p>Canadarm</p> Signup and view all the answers

    A celestial object is any ______ object found in space.

    <p>natural</p> Signup and view all the answers

    Match each planet type with its characteristics:

    <p>Inner Planets = Small size and rocky surface Outer Planets = Large size and mostly made of gases</p> Signup and view all the answers

    Which of the following is NOT a challenge astronauts face in space?

    <p>Abundance of oxygen (A)</p> Signup and view all the answers

    Pluto is classified as a planet since it is spherical and orbits the Sun.

    <p>False (B)</p> Signup and view all the answers

    What does Earth's rotation cause?

    <p>day and night</p> Signup and view all the answers

    Photosynthesis is the process by which organisms break down glucose to produce energy.

    <p>False (B)</p> Signup and view all the answers

    The process of ______ releases carbon dioxide and water, which are used in photosynthesis.

    <p>cellular respiration</p> Signup and view all the answers

    Which of the following organisms are capable of carrying out photosynthesis?

    <p>Plants (A), Bacteria (B)</p> Signup and view all the answers

    Match the following trophic levels with their corresponding examples:

    <p>Producers = Hawks Primary Consumers = Grass Secondary Consumers = Rabbits Tertiary Consumers = Snakes</p> Signup and view all the answers

    Which of the following describes a symbiotic relationship where both organisms benefit?

    <p>Mutualism (C)</p> Signup and view all the answers

    Which of the following is NOT a key process in the nitrogen cycle?

    <p>Photosynthesis (C)</p> Signup and view all the answers

    Invasive species always have a negative impact on the ecosystem they invade.

    <p>True (A)</p> Signup and view all the answers

    What is the term for the build-up of toxins in an organism over time?

    <p>Bioaccumulation</p> Signup and view all the answers

    The maximum population size an environment can support sustainably is called the ______.

    <p>carrying capacity</p> Signup and view all the answers

    Match the following ecological relationships with their definitions:

    <p>Predation = One organism benefits while the other is harmed Commensalism = One organism benefits while the other is unaffected Mutualism = Both organisms benefit from the interaction</p> Signup and view all the answers

    Which of the following is NOT a way to conserve biodiversity?

    <p>Introducing non-native species (A)</p> Signup and view all the answers

    The biosphere includes all living organisms on Earth, as well as the physical environment they inhabit.

    <p>False (B)</p> Signup and view all the answers

    What is the process called when excess nutrients in water cause algal blooms and reduce oxygen levels?

    <p>Eutrophication</p> Signup and view all the answers

    The ______ series lists materials based on their tendency to gain or lose electrons.

    <p>Electrostatic</p> Signup and view all the answers

    What is the mass number of an atom if it has 12 protons and 14 neutrons?

    <p>26 (B)</p> Signup and view all the answers

    Anions are formed by losing electrons.

    <p>False (B)</p> Signup and view all the answers

    What are the chemical properties that describe a substance's ability to react?

    <p>Flammability and reactivity with acid</p> Signup and view all the answers

    The formula for density is Density = Mass/_______.

    <p>Volume</p> Signup and view all the answers

    Match the following groups of elements with their characteristics:

    <p>Alkali Metals = 1 valence electron, highly reactive Halogens = 7 valence electrons, very reactive Noble Gases = Full outer shell, inert Alkaline Earth Metals = 2 valence electrons, reactive</p> Signup and view all the answers

    What charge does glass acquire when rubbed with silk?

    <p>Positively charged (C)</p> Signup and view all the answers

    Electric charges of the same type attract each other.

    <p>False (B)</p> Signup and view all the answers

    What is the main advantage of using renewable energy sources?

    <p>Sustainability</p> Signup and view all the answers

    The efficiency can be calculated using the formula Efficiency (%) = (Total Energy Input ______________) × 100.

    <p>Useful Energy Output</p> Signup and view all the answers

    Match the following materials with their classification:

    <p>Copper = Conductor Rubber = Insulator Glass = Insulator Silver = Conductor</p> Signup and view all the answers

    Which of the following formulas is used to calculate the cost of using an electrical appliance?

    <p>Cost = Power (kW) × Time (h) × Rate ($/kWh) (B)</p> Signup and view all the answers

    In a series circuit, the current is the same throughout the circuit.

    <p>True (A)</p> Signup and view all the answers

    What is the total resistance in a series circuit with three resistors of 2Ω, 3Ω, and 5Ω?

    <p>10Ω</p> Signup and view all the answers

    The three main non-renewable energy sources are coal, oil, and __________.

    <p>natural gas</p> Signup and view all the answers

    Which of the following is NOT a method for saving energy?

    <p>Leaving appliances on when not in use (C)</p> Signup and view all the answers

    What is the unit of measurement for current?

    <p>Amperes (A) (A)</p> Signup and view all the answers

    Increased temperature generally decreases the resistance of a conductor.

    <p>False (B)</p> Signup and view all the answers

    What is the main difference between static electricity and current electricity?

    <p>Static electricity involves charges that do not flow, while current electricity involves a continuous flow of electric charge.</p> Signup and view all the answers

    The discovery of the electron was made by ______.

    <p>J.J. Thomson</p> Signup and view all the answers

    Match the following scientists with their contributions to atomic theory:

    <p>John Dalton = Proposed atomic theory J.J. Thomson = Discovered the electron Ernest Rutherford = Discovered the nucleus Niels Bohr = Proposed electron energy levels</p> Signup and view all the answers

    Which of the following factors does NOT affect resistance?

    <p>Time of day (D)</p> Signup and view all the answers

    In the Bohr model of the atom, electrons orbit the nucleus in fixed shells.

    <p>True (A)</p> Signup and view all the answers

    In standard atomic notation, what does 'Z' represent?

    <p>Atomic number (number of protons)</p> Signup and view all the answers

    The formula for calculating the mass number is the number of protons plus the number of ______.

    <p>neutrons</p> Signup and view all the answers

    How many neutrons are in an atom of Carbon with the atomic number of 6 and mass number of 12?

    <p>6 (D)</p> Signup and view all the answers

    Flashcards

    Photosynthesis

    The process by which plants, algae, and some bacteria convert light energy into chemical energy stored in glucose.

    Cellular Respiration

    The process by which organisms break down glucose to produce energy (ATP).

    Producers

    Organisms that create energy-rich compounds via photosynthesis.

    Primary Consumers

    Herbivores that feed on producers.

    Signup and view all the flashcards

    Secondary Consumers

    Organisms that feed on primary consumers.

    Signup and view all the flashcards

    Tertiary Consumers/Top Carnivores

    Predators at the top of the food chain.

    Signup and view all the flashcards

    Parasitism

    One organism benefits while the other is harmed.

    Signup and view all the flashcards

    Mutualism

    Both organisms benefit from the interaction.

    Signup and view all the flashcards

    Carrying Capacity

    The maximum population size an environment can support sustainably.

    Signup and view all the flashcards

    Invasive Species

    A non-native species that disrupts ecosystems by outcompeting native species.

    Signup and view all the flashcards

    Nitrogen Cycle

    The process of converting nitrogen between atmospheric, soil, and biological forms.

    Signup and view all the flashcards

    Bioaccumulation

    The build-up of toxins in an organism over time.

    Signup and view all the flashcards

    Biomagnification

    The increase in concentration of a toxin as it moves up the food chain.

    Signup and view all the flashcards

    Electrostatic Series

    A list of materials arranged based on their tendency to gain or lose electrons.

    Signup and view all the flashcards

    Triboelectric Series (Top)

    Materials at the top of the triboelectric series tend to lose electrons easily and become positively charged when rubbed against materials lower down in the series. They have a lower electron affinity.

    Signup and view all the flashcards

    Triboelectric Series (Bottom)

    Materials at the bottom of the triboelectric series gain electrons easily and become negatively charged when rubbed against materials higher up in the series. They have a higher electron affinity.

    Signup and view all the flashcards

    Electron Affinity

    The ability of a material to attract and hold electrons.

    Signup and view all the flashcards

    Power (kW)

    The rate at which an appliance uses electrical energy. Measured in kilowatts (kW).

    Signup and view all the flashcards

    Efficiency

    The measure of how efficiently an appliance converts electrical energy input into useful output energy. Expressed as a percentage.

    Signup and view all the flashcards

    Ohm's Law

    The relationship between voltage, current, and resistance in an electrical circuit. V = I * R.

    Signup and view all the flashcards

    Series Circuit (Current)

    Components in a series circuit experience the same current flowing through them.

    Signup and view all the flashcards

    Parallel Circuit (Current)

    Circuits where branches allow current to split, so current is divided across the branches.

    Signup and view all the flashcards

    What is an Astronomical Unit (AU)?

    The average distance from Earth to the Sun, approximately 149.6 million kilometers.

    Signup and view all the flashcards

    What is the Asteroid Belt?

    A region between Mars and Jupiter containing rocky remnants from the early solar system, with Ceres being the largest object.

    Signup and view all the flashcards

    What are Constellations?

    Patterns of stars in the night sky that ancient cultures used for navigation, tracking time, and religious significance.

    Signup and view all the flashcards

    What is a Lunar Eclipse?

    When Earth passes between the Sun and Moon, casting a shadow on the Moon making it appear darker.

    Signup and view all the flashcards

    What is a Solar Eclipse?

    When the Moon passes between the Sun and Earth, blocking sunlight.

    Signup and view all the flashcards

    Atomic Number

    The number of protons in an atom's nucleus. It defines the element's identity.

    Signup and view all the flashcards

    Mass Number

    The total number of protons and neutrons in an atom's nucleus. It represents the atom's approximate mass.

    Signup and view all the flashcards

    Number of Neutrons

    The difference between the mass number and the atomic number. It represents the number of neutrons in the nucleus.

    Signup and view all the flashcards

    Reactivity

    The tendency of an element to gain, lose, or share electrons to achieve a stable outer shell. It's driven by the desire to have a full outer shell of electrons.

    Signup and view all the flashcards

    Group

    A vertical column on the periodic table. Elements in the same group have similar chemical properties due to the same number of valence electrons.

    Signup and view all the flashcards

    Period

    A horizontal row on the periodic table. Elements in the same period have varying reactivity depending on their distance from completing their outer shell.

    Signup and view all the flashcards

    Particles of Matter

    Tiny particles that make up all matter. They are constantly in motion, attracted to each other, and unique to each substance.

    Signup and view all the flashcards

    Physical Properties

    Characteristics of a substance that can be observed without changing its chemical composition. Examples include color, texture, density, boiling point.

    Signup and view all the flashcards

    Earth's Axis

    The imaginary line that passes through Earth's North and South poles, around which the Earth rotates.

    Signup and view all the flashcards

    Earth's Tilt

    The tilt of Earth's axis at 23.5 degrees is responsible for the different seasons.

    Signup and view all the flashcards

    Inner Planets

    The inner planets (Mercury, Venus, Earth, Mars) are rocky, dense, and closer to the Sun.

    Signup and view all the flashcards

    Outer Planets

    The outer planets (Jupiter, Saturn, Uranus, Neptune) are gas giants with many moons and rings, located further from the Sun.

    Signup and view all the flashcards

    Celestial Object

    Any natural object in space, such as stars, planets, moons, asteroids, comets, and galaxies.

    Signup and view all the flashcards

    Earth's Rotation

    The Earth's complete spin on its axis, taking approximately 24 hours, resulting in day and night.

    Signup and view all the flashcards

    Earth's Revolution

    The Earth's complete journey around the Sun, taking approximately 365.25 days, causing the change of seasons.

    Signup and view all the flashcards

    Kuiper Belt

    It is the space where there are many small, icy bodies that are leftover from the early formation of the solar system.

    Signup and view all the flashcards

    What is photosynthesis?

    Photosynthesis is the process used by plants, algae and some bacteria to convert light energy into chemical energy stored in glucose.

    Signup and view all the flashcards

    What is cellular respiration?

    Cellular respiration is the process in which organisms break down glucose to produce energy in the form of ATP.

    Signup and view all the flashcards

    How are photosynthesis and respiration related?

    Plants produce glucose and oxygen, which are used as reactants in cellular respiration. Meanwhile, cellular respiration releases carbon dioxide and water, which are used in photosynthesis.

    Signup and view all the flashcards

    What are producers?

    Organisms at the bottom of the food chain that produce their own food through photosynthesis, like plants, algae, and some bacteria.

    Signup and view all the flashcards

    What are primary consumers?

    Organisms that feed on producers, like rabbits and deer.

    Signup and view all the flashcards

    What are secondary consumers?

    Organisms that feed on primary consumers, like snakes and foxes, consuming herbivores.

    Signup and view all the flashcards

    What are tertiary consumers?

    Predators at the top of the food chain with no natural predators, like hawks and lions.

    Signup and view all the flashcards

    Commensalism

    A relationship where one organism benefits while the other is unaffected. For example, barnacles attached to whales get a free ride and access to food.

    Signup and view all the flashcards

    Exponential Growth

    Rapid population growth under ideal conditions, often shown as a J-shaped curve on a graph.

    Signup and view all the flashcards

    Phosphorus Cycle

    The movement of phosphorus through rocks, soil, water, and organisms. Unlike other cycles, it does NOT have an atmospheric component.

    Signup and view all the flashcards

    Carbon Cycle

    The exchange of carbon among the atmosphere, oceans, soil, and living organisms. Key processes include photosynthesis and respiration.

    Signup and view all the flashcards

    Water Cycle

    The movement of water through evaporation, condensation, precipitation, and infiltration.

    Signup and view all the flashcards

    Eutrophication

    Excess nutrients (nitrogen and phosphorus) in water cause algal blooms, reducing oxygen levels and harming aquatic life.

    Signup and view all the flashcards

    Law of Electric Charges

    Like charges repel each other, while opposite charges attract.

    Signup and view all the flashcards

    Conductors vs. Insulators

    Conductors allow electrons to flow freely, while insulators restrict electron flow.

    Signup and view all the flashcards

    Electric Current

    A measure of the amount of electrical charge flowing through a conductor per unit time. It is the rate of flow of electric charge.

    Signup and view all the flashcards

    Resistance

    The opposition to the flow of electric current in a material. It is caused by collisions of electrons with atoms within the material.

    Signup and view all the flashcards

    Potential Difference (Voltage)

    The difference in electrical potential energy between two points in a circuit. It is the driving force that pushes electric charge through a conductor.

    Signup and view all the flashcards

    Static Electricity

    The buildup of electric charge on a surface, often caused by friction. The charge is static, meaning it doesn't flow.

    Signup and view all the flashcards

    Current Electricity

    The continuous flow of electric charge through a conductor. Requires a closed circuit for current to flow.

    Signup and view all the flashcards

    Plum Pudding Model

    A model of the atom proposed by J.J. Thomson. It suggested electrons were embedded in a positively charged sphere, like plums in a pudding.

    Signup and view all the flashcards

    Bohr Model

    A model of the atom proposed by Niels Bohr. It describes electrons orbiting the nucleus in specific energy levels or shells.

    Signup and view all the flashcards

    Bohr-Rutherford Diagram

    A diagram that represents the arrangement of subatomic particles (protons, neutrons, electrons) in an atom. The nucleus contains protons and neutrons, while electrons occupy shells around the nucleus.

    Signup and view all the flashcards

    Standard Atomic Notation

    A standard format for representing the composition of an atom: Z/AxX. Where Z is the atomic number (number of protons), A is the mass number (protons + neutrons), and X is the element symbol.

    Signup and view all the flashcards

    Study Notes

    Photosynthesis and Cellular Respiration

    • Photosynthesis is the process where plants, algae, and some bacteria convert light energy into chemical energy stored in glucose.
    • The word equation for photosynthesis is: Carbon dioxide + Water + Light energy → Glucose + Oxygen
    • The reactants in photosynthesis are carbon dioxide (CO2), water (H2O), and light energy.
    • The products of photosynthesis are glucose (C6H12O6) and oxygen (O2).
    • Cellular respiration is the process by which organisms break down glucose to generate energy (ATP).
    • The word equation for cellular respiration is: Glucose + Oxygen → Carbon dioxide + Water + Energy (ATP)
    • The reactants in cellular respiration are glucose (C6H12O6) and oxygen (O2).
    • The products of cellular respiration are carbon dioxide (CO2), water (H2O), and ATP (energy).
    • Photosynthesis and cellular respiration are interconnected; the products of one become the reactants of the other, sustaining life.

    Trophic Levels

    • Producers: create energy-rich compounds via photosynthesis (e.g., plants, algae).
    • Primary Consumers: Herbivores that feed on producers (e.g., rabbits, deer).
    • Secondary Consumers: Carnivores or omnivores that feed on primary consumers (e.g., snakes, foxes).

    Types of Interactions

    • Parasitism: One organism benefits, the other is harmed (e.g., ticks on deer).
    • Mutualism: Both organisms benefit (e.g., bees and flowers).
    • Competition: Organisms compete for resources (e.g., food, habitat).
    • Predation: One organism preys on another (e.g., lions hunting zebras).
    • Commensalism: One organism benefits, the other is unaffected (e.g., barnacles on whales).

    Population Dynamics

    • Exponential Growth: rapid population increase under ideal conditions (J-shaped curve).
    • Carrying Capacity: the maximum population size an environment can support sustainably (S-shaped curve).

    Invasive Species

    • Definition: Non-native species that disrupt ecosystems.
    • Examples: Zebra mussels, kudzu vine, cane toads

    Biogeochemical Cycles

    • Nitrogen Cycle: Conversion of nitrogen between atmospheric, soil, and biological forms.
    • Phosphorus Cycle: Movement of phosphorus through rocks, soil, water, and organisms.

    Carbon Cycle

    • Exchange of carbon among the atmosphere, oceans, soil, and living organisms. Includes photosynthesis and respiration.

    Water Cycle

    • Movement of water through evaporation, condensation, precipitation, and infiltration.

    Earth's Spheres

    • Biosphere: All living organisms.
    • Atmosphere: Gaseous layer around Earth.
    • Hydrosphere: Water bodies.
    • Lithosphere: Earth's crust and landforms.

    Eutrophication

    • Excess nutrients (nitrogen and phosphorus) in water cause algal blooms, reducing oxygen levels and harming aquatic life.

    Bioaccumulation and Biomagnification

    • Bioaccumulation: Build-up of toxins in an organism over time.
    • Biomagnification: Increase in toxin concentration as it moves up the food chain.

    Biodiversity and Climate Change

    • Loss of species due to habitat destruction, pollution, and climate shifts.
    • Impacts ecosystems, food security, and global health.

    Conservation of Biodiversity

    • Habitat preservation and restoration.
    • Establishing protected areas (national parks).
    • Reducing pollution, recycling, and sustainable practices.
    • Controlling invasive species.

    Renewable and Non-Renewable Energy Sources

    • Renewable: Solar, wind, hydro, geothermal, biomass.
      • Advantages: Sustainable, less pollution.
      • Disadvantages: Intermittent availability, high initial costs.
    • Non-renewable: Coal, oil, natural gas, nuclear.
      • Advantages: High energy output, reliable.
      • Disadvantages: Limited supply, environmental damage.

    Electrostatic Series

    • A list of materials arranged based on their tendency to gain or lose electrons.

    Ohm's Law and Circuits

    • V = I x R (Voltage = Current x Resistance)
      • V: Voltage (Volts, V)
      • I: Current (Amperes, A)
      • R: Resistance (Ohms, Ω\OmegaΩ)
    • Series Circuits: Current (I) is the same throughout the circuit, and voltage (V) is divided across components.
    • Parallel Circuits: Current (I) is divided across branches and voltage (V) is the same across each branch.
    • Resistance (R) : total R = R1 + R2 + R3...

    Factors Affecting Resistance

    • Material: Conductors have lower resistance; insulators have higher resistance.
    • Length: Longer wires have higher resistance.
    • Thickness: Thicker wires have lower resistance.
    • Temperature: Higher temperatures usually increase resistance.

    Static vs. Current Electricity

    • Static electricity: Accumulation of electric charge on a surface; charges do not flow.
    • Current electricity: Continuous flow of electric charge through a conductor; requires a closed circuit.

    Atomic Theory and Key Scientists

    • John Dalton: Atoms are indivisible particles (incorrect), atoms of the same element are identical, atoms combine in whole-number ratios.
    • J.J. Thomson: Discovered electrons using a cathode ray tube, proposed the 'Plum Pudding Model'.
    • Ernest Rutherford: Conducted the gold foil experiment, discovered the nucleus.
    • Niels Bohr: Proposed that electrons orbit the nucleus in specific energy levels.

    Bohr-Rutherford Diagrams

    • Represent the arrangement of subatomic particles (protons, neutrons, electrons) in an atom.
    • Nucleus: Contains protons (+) and neutrons (neutral).
    • Electron shells: Surround the nucleus, each holding a specific number of electrons.

    Counting Atoms in a Compound

    • Example: C6H12O6 (glucose).

    Standard Atomic Notation

    • Format: Z/AxX, where:
      • A: Mass number (protons + neutrons).
      • Z: Atomic number (protons).
      • X: Element symbol.

    Determining Atomic Details

    • Atomic Number: Number of protons.
    • Mass Number: Protons + Neutrons.
    • Number of Neutrons: Mass Number - Atomic Number.
    • Number of Electrons: Equal to protons in a neutral atom.

    Reactivity and Atomic Structure

    • Reactivity increases down Group 1 (alkali metals), decreases down Group 17 (halogens).

    Particle Theory of Matter

    • Matter is made up of tiny particles that are in constant motion and are attracted to one another.

    Physical and Chemical Properties

    • Physical properties: Quantitative (measurable) and Qualitative (Observable).
    • Chemical Properties: Describe a substance's ability to react.

    Subatomic Particles

    • Protons: Positively charged, found in the nucleus.
    • Neutrons: No charge, found in the nucleus.
    • Electrons: Negatively charged and orbit the nucleus.

    Families of Elements

    • Alkali Metals (Group 1): Highly reactive, 1 valence electron.
    • Alkaline Earth Metals(Group 2): Reactive, 2 valence electrons.
    • Halogens (Group 17): Very reactive nonmetals, 7 valence electrons.
    • Noble Gases (Group 18): Inert, full outer shell

    Ions

    • Cations: Positively charged ions (lose electrons).
    • Anions: Negatively charged ions (gain electrons).

    Mixtures and Pure Substances

    • Mixtures: Combination of substances retaining their properties.
      • Homogeneous: Uniform (e.g., saltwater).
      • Heterogeneous: Not uniform (e.g., sand and water).
    • Pure Substances: Fixed composition.
      • Elements: Made of one type of atom.
      • Compounds: Made of two or more elements bonded.

    Density

    • Formula: Density = Mass/Volume
    • Units: g/cm³ or kg/m³

    Drawing Common Compounds

    • Example: Water (H₂O): Two hydrogen atoms bonded to one oxygen atom.

    Pure Substances vs. Mixtures/Elements vs. Compounds

    • Pure Substance: Uniform properties throughout.
    • Mixture: Combination of substances.
    • Element: Single type of atom.
    • Compound: Two or more elements chemically combined.

    Importance of Earth's Tilt

    • Causes seasons by changing the angle of sunlight throughout the year.

    Inner vs. Outer Planets

    • Inner (Terrestrial): Small, rocky, closer to the Sun, higher densities (Mercury, Venus, Earth, Mars).
    • Outer (Gas Giants): Large, gaseous, farther from the Sun, lower densities (Jupiter, Saturn, Uranus, Neptune).

    Canadian Contributions to Space Exploration

    • Canadarm, Canadarm2, Chris Hadfield, RADARSAT.

    Challenges and Hazards for Astronauts

    • Microgravity: Muscle and bone loss.
    • Radiation: Exposure to harmful cosmic rays.
    • Psychological stress: Isolation, confinement.
    • Health issues: Altered fluid distribution.

    Definition of Celestial Objects

    • Celestial Objects are natural objects found in space (e.g., stars, planets, moons, asteroids, comets, galaxies)

    Earth's Rotation and Revolution

    • Rotation: Earth spins on its axis, causing day and night.
    • Revolution: Earth orbits the Sun, taking 365.25 days and causing seasons.

    Astronomical Unit

    • The average distance from Earth to the Sun. (approximately 149.6 million km).

    Asteroid Belt

    • Located between Mars and Jupiter.
    • Contains rocky remnants from the early solar system.
    • Largest object: Ceres.

    Constellations

    • Patterns of stars in the night sky (e.g., Orion, Ursa Major, Scorpius).

    Why Ancient Cultures Studied the Skies

    • Navigation
    • Tracking time
    • Religious and cultural significance

    Lunar and Solar Eclipses

    • Lunar Eclipse: Earth passes between the Sun and the Moon, casting a shadow on the Moon.
    • Solar Eclipse: The Moon passes between the Sun and the Earth, blocking sunlight.

    Big Bang Theory

    • Explained the origin of the universe.
    • Universe began as a singularity and has been expanding.

    Solar Nebula Theory

    • Explained the formation of a solar system.
    • Solar system formed from a rotating cloud of gas and dust about 4.6 billion years ago.

    Galaxies

    • A massive system of stars, planets, gas, dust, and dark matter bound by gravity.
    • Types of Galaxies include: Spiral, Elliptical, Irregular.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Science Exam Review PDF

    Description

    Test your knowledge on key concepts of ecology and photosynthesis. This quiz covers topics such as reactants and products of photosynthesis, predator-prey relationships, and various ecological roles. Challenge yourself with questions about the nitrogen cycle, biotic and abiotic factors, and growth curves.

    More Like This

    Use Quizgecko on...
    Browser
    Browser