Chemical Reactions Enzymes

An enzyme speeds up a reaction by

• lowering the activation energy.
• raising the activation energy.
• releasing energy.
• absorbing energy.

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NGSS.HS-PS1-5

In a chemical reaction, a reactant binds to an enzyme at a region known as the

• catalyst.
• product.
• substrate.
• active site. 

Chemical reactions always involve

• the breaking of bonds in reactants.
• the formation of new bonds in products.
• the breaking of bonds in reactants and the formation of new bonds in products.
• enzymes. 

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Chemical reactions that release energy often occur 

• spontaneously.
• nonspontaneously.
• rapidly.
• slowly. 

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NGSS.HS-PS1-4

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Chemical reactions that absorb energy often occur 

• spontaneously.
• nonspontaneously.
• rapidly.
• slowly. 

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NGSS.HS-PS1-4

The enzyme catalase speeds up the chemical reaction that changes hydrogen peroxide into oxygen and water. The amount of oxygen given off is an indication of the rate of the reaction. Based on the graph, what can you conclude?

• Reaction rate decreases with increasing enzyme concentration.
• Reaction rate increases with decreasing enzyme concentration.
• Reaction rate increases with increasing enzyme concentration.
• The variables are indirectly proportional.

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Which concentration of catalase will produce the fastest reaction rate?

• 5%
• 10%
• 15%
• 20%

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Which of the factors does NOT affect enzymatic activity?

• Temperature
• pH
• Concentration
• Color

An enzyme is a catalyst.

• True
• False

What type of catalyst is an enzyme?

• Biological
• Mechanical
• Chemical
• Electrical