Maxwell-Boltzmann Curves and Activation Energy October 2015

1) What will happen to the curve below when the concentration of the reactant is increased? a)The graph will shift upward b)The E a will shift to the right c)The E a will shift to the left d)The graph will shift to the right e)The graph will not change

2) What will happen to the curve below when a catalyst is added? a)The graph will shift upward b)The E a will shift to the right c)The E a will shift to the left d)The graph will shift to the right e)The graph will not change

3) What will happen to the curve below when the temperature decreases? a)The graph will shift downward b)The E a will shift to the right c)The E a will shift to the left d)The graph will shift to the right e)The graph will shift to the left

4) What will happen to area I when the temperature increases? a)It will remain the same b)It will increase c)It will decrease

5) What will happen to the height of the curve when the temperature increases? a)It will remain the same b)It will increase c)It will decrease d)It is difficult to predict

6) Why does increasing the temperature increase the reaction rate? a)At higher temperatures, the activation energy is greater b)At higher temperatures, there are more collisions per unit time c)At higher temperatures, the particles have more kinetic energy d)Both a) and c) e)Both b) and c)

7) The presence of a catalyst is thought to increase the rate of a reaction by a.changing the products that are formed in the reaction b.decreasing the enthalpy change of the reaction c.increasing the enthalpy change of the reaction d.decreasing the activation energy of the reaction e.increasing the activation energy of the reaction

8) Which factors increase the percent of successful collisions? a)Increasing concentration b)Increasing the temperature c)Adding a catalyst d)All of the above e)Two of the above

9)Which factors increase the total number of collisions that occur in a reaction? a)Increasing concentration b)Increasing the temperature c)Adding a catalyst d)All of the above e)Two of the above

10)What factors seem to be preventing a reaction in a, b and d but not in c? a)Incorrect orientation b)Insufficient energy c)Both a and b d)None of the above