Questions:

1) In a particular exothermic reaction, the activation energy is 20 kj/mol and the enthalpy change for the reaction is 200 kj/mol. Sketch and label an energy profile diagram for this reaction:

2) On the following diagram, mark the following:

a) a vertical line to approximate the activation energy for a general reaction :

b) another vertical line to reflect the relative position of the activation energy should a catalyst be added:

3) On the following diagram, mark the relative positions for the activation energies of an endothermic and exothermic reaction:

4) The following diagram illustrates a molecular energy distribution curve for a chemical system. On the diagram sketch the relative positions of the energy curve if:

a) the temperature of the system was increased:

b) the temperature of the system was decreased: