Exploring Potential Energy Diagrams in Chemical Reactions

What is the term for the highest point on a potential energy diagram?

• Products

• Reactants

• Transition State

• Intermediate

In an exothermic reaction, how does the energy of the products compare to the reactants?

• Energy comparison is not relevant

• Products have more energy

• Products have less energy

• Products have the same energy

Tags

NGSS.HS-PS1-4

What is the primary role of a catalyst in a chemical reaction?

• Increase the activation energy

• Lower the activation energy

• Decrease the energy of products

• Increase the energy of reactants

How does adding a catalyst affect the speed of a reaction?

• It slows down the reaction

• It has no effect on the reaction speed

• It speeds up the reaction

• It stops the reaction

In an endothermic reaction, what is the sign of Delta H?

• Undefined

• Negative

• Zero

• Positive

Tags

NGSS.HS-PS1-4

How do you calculate the forward activation energy?

• Products minus reactants

• Transition state minus reactants

• Reactants minus products

• Transition state minus products

In a two-step reaction, what determines the slow step?

• The step with the higher activation energy

• The step with the intermediate energy

• The step with the lower activation energy

• The step with the highest product energy

Tags

NGSS.HS-PS1-4

What is the enthalpy change for the first step if the intermediate has more energy than the reactants?

• Negative

• Undefined

• Zero

• Positive

Tags

NGSS.HS-PS1-4

In a three-step reaction, if the second step is exothermic and the overall reaction is endothermic, how should the energy of the products compare to the reactants?

• Products have less energy than reactants

• Products have more energy than reactants

• Products have the same energy as reactants

• Energy comparison is not relevant

Tags

NGSS.HS-PS1-4

If the second step in a three-step reaction is the rate-determining step, what can be inferred about its activation energy?

• It has the intermediate activation energy

• Activation energy is not relevant

• It has the highest activation energy

• It has the lowest activation energy