Chapter 2.4 Chemical Reactions and Enzymes

What is the process that changes one set of chemicals to another?

• Chemical reaction

• Molecules

• Evaporation

• Theory

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In a chemical reaction, --- is conserved

• Matter

• Energy

• Both matter and energy

• Neither matter nor energy

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Label the following

a

b

c

Reactants

Products

Chemical reaction

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When chemical bonds break, energy is ---

• Released

• Stored

• Destroyed

• Lost

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When chemical bonds form, energy is ---

• Released

• Stored

• Destroyed

• Lost

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What is the energy needed for a reaction to begin?

• Activation energy

• Terminal energy

• Enzyme

• Substrate

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Which of the following is NOT true about endothermic reactions

• Absorbs heat

• Releases heat

• Breaks bonds

• Temperature decreases

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Which of the following is NOT true about exothermic reactions

• Absorbs heat

• Releases heat

• Bonds form

• Temperature increases

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Enzymes are

• Proteins

• Nucleic acids

• Carbohydrates

• Lipids

Enzymes --- the rate of chemical reactions

• Increase

• Decrease

• Do not affect

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