Heat and Energy Quiz

What happens during an exothermic reaction?

• A. The reaction releases energy into the environment.

• B. The reaction stores energy from the environment.

• C. The reaction exchanges energy with the environment.

• D. The reaction creates new energy from the environment.

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Heat and Energy

Which of the following types of atoms forms the “backbone” of an organic molecule by bonding to itself?

• A. hydrogen

• B. oxygen

• C. calcium

• D. carbon

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Heat and Energy

Which of the following is the best statement of the second law of thermodynamics?

• A. Energy can neither be created nor destroyed.

• B. The total amount of energy in a system remains constant.

• C. No energy transformation is 100 percent efficient.

• D. The most efficient form of energy is heat energy.

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Heat and Energy

Which of these substances would be the best heat conductor?

• A. air

• B. copper

• C. straw

• D. wool

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Heat and Energy

Hydrocarbon molecules, formed from hydrogen and carbon, make up which of the following substances?

• A. fossil fuels

• B. nuclear fuels

• C. electricity

• D. food

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Heat and Energy

Heat travels in three ways, conduction, convection, and which of the following?

• A. joules

• B. radiation

• C. velocity

• D. contraction

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Heat and Energy

Which of the following explains the increasing rate of movement of gas molecules as the gas is heated?

• A. first law of thermodynamics

• B. second law of thermodynamics

• C. kinetic molecular theory

• D. heat expansion theory

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Heat and Energy

What does the chemical formula of a molecule represent?

• A. the number and types of atoms in the molecule

• B. the arrangement of atoms in the molecule

• C. the three-dimensional shape of the molecule

• D. the reactions the molecule can undergo

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Heat and Energy

Carbon dioxide and water represent what part of a complete combustion reaction?

• A. reactants

• B. products

• C. catalyst

• D. activation energy

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Heat and Energy

Which of the following objects is showing kinetic energy?

• A. a rock at the top of a hill

• B. a runner poised at the starting line

• C. water at the top of a waterfall

• D. water in the middle of a waterfall

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Heat and Energy