Primary Energy Sources

Besides coal and natural gas, another fossil fuel  is

• petroleum/oil
• biomass
• electricity
• uranium

Fossil fuels are nonrenewable resources because they

• take millions of years to form

• are not re-useable

• are in high demand

• pollute the air

All of the following are renewable except

• uranium
• solar
• hydropower
• food crops (biomass)

The original source of energy for fossil fuels comes from the

• sun

• Earth's crust

• geothermal energy

• biomass

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Pumped storage, tides, and dams are examples of

• hydropower

• wind energy

• geothermal energy

• radiant energy

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This fossil fuel releases the least amount of air pollution when used to produce electricity.

• natural gas

• coal

• nuclear

• oil

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What is a concern we have with adding too much CO₂ to the atmosphere (due to electricity production and other human activities)?

• makes too many clouds

• makes the polar ice caps melt

• affects our air quality (PM 2.5)

• disrupts solar energy

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A fuel has a HIGH specific energy but LOW energy density. We can tell that the fuel has . . .

• a high density (kg/m³).

• a density similar to water.

• a low density (kg/m³).

• a density similar to uranium.

Although not SI units, a scientist could express specific energy in units of . . .

• eV u^-1

• N kg m^-1

• W s^-1 kg^-1

• A s C^-1

The energy released in burning 2.0 kg of gasoline is

• 23 MJ

• 68,000 MJ

• 92 MJ

• 17,000 MJ

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