Energy Sources Review: Chapters 8 & 20

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Questions and Answers

What is a disadvantage that fossil fuels and biomass have in common?

Carbon dioxide

Which element has 3 million times the energy of the same amount of coal?

Uranium-235

About how much of the electricity in the United States is produced using fossil fuels?

85%

Give three examples of fossil fuels.

<p>Petroleum, natural gas, gasoline, oil</p> Signup and view all the answers

What process is used to get diesel, octane, and other products from petroleum?

<p>Fractional distillation</p> Signup and view all the answers

What types of things are included in "biomass"?

<p>Wood, soy, corn, fibers, rice hulls</p> Signup and view all the answers

Which type of alternative fuel has only water as a product when burned for energy?

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

What is a disadvantage of using hydrogen fuel cells?

<p>Expensive, require a lot of energy</p> Signup and view all the answers

What is an advantage of using nuclear fuel?

<p>Produces zero carbon dioxide</p> Signup and view all the answers

What is a disadvantage of using nuclear fuel (Hint: Radioactive waste)

<p>Radioactive waste</p> Signup and view all the answers

What is the source of geothermal energy?

<p>Heat from inside the earth</p> Signup and view all the answers

Flashcards

What are fossil fuels?

Petroleum, natural gas, and coal are all examples of fossil fuels.

What is fractional distillation?

The process of separating different components of petroleum based on their boiling points.

What is nuclear fission?

The process of splitting an atom's nucleus to release energy.

What is nuclear fusion?

The process of combining two atomic nuclei to release energy.

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What is uranium?

A radioactive element used as fuel in nuclear reactors.

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What is geothermal energy?

Energy derived from the heat within the Earth's core.

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What is hydroelectric power?

A renewable energy source that uses the movement of water, like in rivers or tides, to generate electricity.

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What is wind energy?

A renewable energy source that uses the force of wind to generate electricity.

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What is solar energy?

A renewable energy source that uses sunlight to generate electricity.

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What is biomass energy?

A renewable energy source that involves the use of organic matter, like wood or crops, to generate energy.

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What is a renewable energy resource?

A type of energy resource that can be replenished over time, such as solar energy or wind energy.

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What is a non-renewable energy resource?

A type of energy resource that cannot be replenished over time, such as fossil fuels or nuclear energy.

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What is a hydrogen fuel cell?

A fuel cell that uses hydrogen gas as fuel and produces electricity with water as a byproduct.

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What is photochemical smog?

A type of smog caused by chemical reactions between pollutants and sunlight.

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What is a generator?

A device that converts mechanical energy into electrical energy.

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What is carrying capacity?

The maximum number of individuals of a species that a given environment can sustainably support.

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What is half-life?

The time it takes for the amount of a radioactive substance to reduce to half its original amount.

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What is radiant energy?

Energy released from the Sun in the form of electromagnetic radiation.

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What are photovoltaic cells?

Devices that convert solar energy into electricity.

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What are control rods?

Rods used to control the rate of a nuclear reaction by absorbing neutrons.

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What is gamma radiation?

A type of radiation that consists of high-energy electromagnetic waves.

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What is beta radiation?

A type of radiation that consists of high-energy electrons.

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What is alpha radiation?

A type of radiation that consists of helium nuclei.

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What is an environmental disadvantage of hydroelectric dams?

The disruption of natural ecosystems caused by the construction and operation of hydroelectric dams.

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What is tidal energy?

Energy derived from the movement of water due to the gravitational forces between Earth, the moon, and the sun.

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What are the main byproducts of burning fossil fuels and biomass?

The main byproducts of burning fossil fuels and biomass include:

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Where do fossil fuels come from?

Fossil fuels are formed from the decomposition of ancient plants and animals over millions of years.

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What happens in both nuclear fusion and fission?

The process that occurs in both nuclear fusion and fission, where matter is converted into energy.

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Which type of radiation can cause other substances to become radioactive?

Neutrons can cause other substances to become radioactive through a process called neutron activation.

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If thorium-234 has a half-life of 24 days, how much would remain after 72 days?

The amount of a substance that is left after each half-life is halved. After 72 days, 12.5 g of the original 100 g would remain.

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Study Notes

Chapter 8 and 20 Review

  • A disadvantage of fossil fuels and biomass is carbon dioxide.
  • Uranium has 3 million times the energy of coal.
  • About 85% of electricity in the US is from fossil fuels.
  • Examples of fossil fuels: petroleum, natural gas, gasoline, oil, coal, octane.
  • Fractional distillation is used to get different fuels from petroleum.
  • Renewable energy sources: solar, hydroelectric, wind, geothermal, hydrogen fuel cells, biomass.
  • Non-renewable energy sources: fossil fuels, nuclear energy.
  • Biomass includes wood, soy, corn, fibers, rice hulls.
  • A disadvantage of using hydrogen fuel cells is expense.
  • An advantage of using nuclear fuel is zero carbon dioxide.
  • A disadvantage of using nuclear fuel is radioactive waste.
  • The source of geothermal energy is heat from inside the Earth.

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