Factors Affecting the Rate of Chemical Reactions

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

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

Catalysts permit reactions to happen with a __________ activiation energy.

• lower

• higher

Based on the collision model, the atoms in the top of potential energy ‘’hill’’ are called

• Top of hill

• Activation energy

• Transition state

• Steric factor

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.

An addition of a catalyst to the following reaction would have what effect?

• A would be increased

• B would be increased

• C would be decreased

• No change

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NGSS.HS-PS1-4

NGSS.HS-PS1-5

Reaction rate means...

• amount of product formed

• speed of reaction

• concentration of reacting particles

• combining reactants with products

Tags

NGSS.HS-PS1-5

To measure rate of reaction, we can monitor change in which of the following?

• Reactants only

• Products only

• Reactants or products

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NGSS.HS-PS1-5

Which factor increases the frequency of reactant particle collisions in a chemical reaction?

• Decreasing temperature

• Increasing surface area

• Reducing concentration

• Lowering gas pressure

Tags

NGSS.HS-PS1-5

How does increasing the concentration of reactants affect the rate of a chemical reaction?

• It decreases the rate

• It has no effect

• It increases the rate

• It only affects reactions in closed systems

Tags

NGSS.HS-PS1-5