Try It: Energy & Chemical Reactions

The energy diagram on the left is an example of an.....

• Endothermic reaction

• Exothermic reaction

The energy diagram on the right is an example of an.....

• Endothermic reaction

• Exothermic reaction

Which of the following represents the energy of the reactants?

• A

• B

• C

• D

• E

Which of the following represents the energy of the products?

• A

• B

• C

• D

• E

Which of the following represents the activation energy?

• A

• B

• C

• D

• E

Which of the following represents the activated complex or transition state?

• A

• B

• C

• D

• E

Which of the following represents the heat of reaction or  $\Delta$  H?

• A

• B

• C

• D

• E

In endothermic reactions the heat of reaction or  $\Delta$  H is...

• positive

• negative

• zero

In exothermic reactions the heat of reaction or  $\Delta$  H is...

• positive

• negative

• zero

Which graph has a lower activation energy?

• A

• B

• They are the same