1. ) A catalyst speeds up a chemical reaction by a. shifting the equilibrium. b.

Question

1. ) A catalyst speeds up a chemical reaction by

a. shifting the equilibrium.

b. increasing the activation energy.

c. decreasing the reaction enthalpy.

d. providing an alternate reaction pathway.

2.) This exothermic reaction is catalyzed by MnO2(s). 2H2O2(aq) => 2 H2O(l) + O2(g) Which of the following will increase the rate of this reaction?

1. Raising the temperature

2. Increasing the surface area of MnO2(s)

a. 1 only

b. Always 1, sometimes 2

c. Both 1 and 2

d. 2 only

3.) A first order reaction has a rate constant of 0.661 at 30 oC. Given that the Arrhenius constant for the reaction is 1.1 x 1010 sec -1, calculate the value of the activation energy in KILOJOULES

4.)A first order reaction has a rate constant of 0.661 at 30 oC. Given that the Arrhenius constant for the reaction is 1.1 x 1010 sec -1, calculate the value of the activation energy in KILOJOULES

Explanation / Answer

Q1. A catalyst provides an alternate path to ctalyse a reaction. Hence option (d) is the correct answer.

Q2. Rate of areaction increases with temperature .aFurther if sueface area of catalyst in increased the surface area for reaction to take place also increases. Hence Option (c) is the corrrect answer.

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