10-1 Chemical Kinetics

Which sample of HCl(aq) reacts at the fastest rate with a 1.0-gram sample of iron filings?

• 10. mL of 1 M HCl(aq) at 10°C

• 10. mL of 1 M HCl(aq) at 25°C

• 10. mL of 3 M HCl(aq) at 10°C

• 10. mL of 3 M HCl(aq) at 25°C

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Which two experiments can be used to investigate the effect of the concentration of HCl(aq) on the reaction rate?

• 1 and 3

• 1 and 5

• 4 and 2

• 4 and 3

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For a given chemical reaction, the addition of a catalyst provides a different reaction pathway that

• decreases the reaction rate and has a higher activation energy

• decreases the reaction rate and has a lower activation energy

• increases the reaction rate and has a higher activation energy

• increases the reaction rate and has a lower activation energy

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Each of four test tubes contains a different concentration of HCl(aq) at 25°C. A 1-gram cube of Zn is added to each test tube. In which test tube is the reaction occurring at the fastest rate?

• 1. 1 M HCl(aq)

• 2. 0.1 M HCl(aq)

• 3. 0.01 M HCl(aq)

• 4. 0.001 M HCl(aq)

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A 5.0-gram sample of zinc and a 50-milliliter sample of hydrochloric acid are used in a chemical reaction. Which combination of these samples has the fastest reaction rate?

• a zinc strip and 1.0 M HCl(aq)

• a zinc strip and 3.0 M HCl(aq)

• zinc powder and 1.0 M HCl(aq)

• zinc powder and 3.0 M HCl(aq)

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Adding a catalyst to a chemical reaction results in:

• a decrease in activation energy and a decrease in the reaction rate

• a decrease in activation energy and an increase in the reaction rate

• an increase in activation energy and a decrease in the reaction rate

• an increase in activation energy and an increase in the reaction rate

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Which conditions will increase the rate of a chemical reaction?

• decreased temperature and decreased concentration of reactants

• decreased temperature and increased concentration of reactants

• increased temperature and decreased concentration of reactants

• increased temperature and increased concentration of reactants

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Given the reaction at equilibrium: N₂(g) + 3H₂(g) ↔ 2NH₃(g). Increasing the concentration of N₂(g) will increase the forward reaction rate due to:

• a decrease in the number of effective collisions

• an increase in the number of effective collisions

• a decrease in the activation energy

• an increase in the activation energy

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A 1-cubic-centimeter cube of sodium reacts more rapidly in water at 25°C than does a 1-cubic-centimeter cube of calcium at 25°C. The difference in rate of reaction is most closely associated with the different

• surface area of the metal cubes

• nature of the metals

• density of the metals

• concentration of the metals

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A chemical reaction occurs when reactant particles

• are separated by great distances

• have no attractive forces between them

• collide with proper energy and proper orientation

• convert chemical energy into nuclear energy

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