Chemical Reactions and Factors Affecting Reaction Rate

Which of the following best describes why increasing temperature increase reaction rate?

• Activation energy is reduced.

• Collisions become more frequent.

• Collisions become more energetic.

• Collisions become more frequent and more energetic.

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NGSS.HS-PS1-5

Which of the following statements about the catalyst is true?

• A catalyst accelerates the rate of reaction by bringing down the activation energy.

• A catalyst does not participate in reaction mechanism.

• A catalyst makes the reaction feasible by making ∆G more negative.

• A catalyst makes equilibrium constant more favorable for forward reaction.

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NGSS.HS-PS1-5

An endothermic reaction with high activation energy for the forward reaction is given by the diagram.

• A

• B

• C

• D

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NGSS.HS-PS1-4

4 factors that affects reaction rate.

• temperature

• surface area

• presence of catalyst

• Chemical nature of reactant

• In solid form

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NGSS.HS-PS1-5

Grinding a seltzer tablet into powder increases the rate of reaction due to...

• increased concentration of reactants

• increased surface area

• increased speed of particles.

• better orientation of reactants

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NGSS.HS-PS1-5

Reaction rate means...

• amount of product formed

• speed of reaction

• concentration of reacting particles

• combining reactants with products

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NGSS.HS-PS1-5

To slow down a chemical reaction you will do one of the following:

• Place the reactants in hot water

• Place the products in ice bath

• Place the reactants in a ice bath

• Keep stirring the reactants with a stirring rod

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NGSS.HS-PS1-5

Usually lowering the temperature will slow down a reaction.

• false

• true

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NGSS.HS-PS1-5

Catalysts permit reactions to happen with a __________ activiation energy.

• lower

• higher

What type of reaction is this?

• Endothermic

• Exothermic

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NGSS.HS-PS1-4