#4 Energy Profiles

What is typically shown on the left side of a reaction energy profile diagram?

• Products

• Reactants

• Catalysts

• Activation energy

What does a negative Delta H indicate in a reaction?

• Energy absorbed

• Energy released

• Increase in reactant energy

• No change in energy

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

• Lower than reactants

• Equal to reactants

• Higher than reactants

• Unchanged

What role does a catalyst play in a chemical reaction?

• Decreases reactant energy

• Lowers the activation energy

• Changes the Delta H

• Increases product energy

Which of the following is NOT changed by the presence of a catalyst in a reaction?

• Activation energy

• Energy of reactants

• Delta H

• Speed of reaction