Rates of Reaction/Energetics

Which letter denotes the energy necessary for the reaction to take place?

• L

• M

• N

• O

• A

• B

• C

• D

• A

• B

• C

• D

• A

• B

• C

• D

• A

• B

• C

• D

Some calcium chloride was reacted with excess dilute hydrochloric acid. The volume of carbon dioxide evolved was recorded and plotted against time. Which of the following graphs represents the reaction?

• A

• B

• C

• D

Which of the following statements is true of an endothermic reaction?

• Heat is given up to the surroundings

• Heat is absorbed from the surroundings

• The products have less energy than the reactants

• The products have the same energy as the reaction

Which of the following diagrams BEST illustrates the course of an exothermic reaction?

• A

• B

• C

• D

Which of the following factors will usually increase the rate of catalytic decomposition of hydrogen peroxide?

• Increasing the temperature

• Applying a greater external pressure

• Using a larger volume of hydrogen peroxide

• Using a larger volume of hydrogen peroxide

Which of the following energy changes occurs during the breaking of a chemical bond?

• Energy is released

• Energy is required

• There is no energy change

• The process is exothermic