Exploring Energy Diagrams and Catalysts in Chemical Reactions

What does collision theory state about the orientation and energy of colliding molecules?

• Molecules must collide in a specific orientation but with any amount of energy.

• Molecules must collide in a specific orientation and with energy exceeding the activation energy.

• Molecules must collide randomly with any amount of energy.

• Molecules must collide randomly with energy exceeding the activation energy.

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What does an energy diagram illustrate about a chemical reaction?

• The speed of the reaction.

• The orientation of molecules during the reaction.

• The energy changes over time during the reaction.

• The number of molecules involved in the reaction.

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What is the difference in energy between reactants and products called?

• Activation energy

• Kinetic energy

• Transition state energy

• Delta H

How does a catalyst affect a chemical reaction?

• It is used up in the reaction.

• It decreases the temperature of the reaction.

• It lowers the activation energy of the reaction.

• It increases the delta H of the reaction.

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Why do reactions tend to have faster rates at higher temperatures?

• Because molecules move slower at higher temperatures.

• Because more molecules have sufficient energy to surpass the activation barrier.

• Because the activation energy increases with temperature.

• Because the delta H of the reaction decreases.

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What does the Arrhenius equation show?

• The relationship between the rate constant and the frequency factor.

• The relationship between the rate constant and the delta H.

• The relationship between the rate constant and the activation energy.

• The relationship between the rate constant and the transition state.

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What is the series of steps that actually occurs in a reaction called?

• Reaction process

• Reaction sequence

• Reaction mechanism

• Reaction pathway

What is the slowest step in a reaction mechanism called?

• Activation step

• Intermediate step

• Transition state

• Rate-determining step

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What is a species found in elementary steps but not in the overall equation called?

• Product

• Catalyst

• Reaction intermediate

• Reactant

How can the rate law for the overall equation be determined?

• By using the activation energy.

• By using the delta H.

• By using the rate-determining step.

• By using the transition state.

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