Can someone please check-over my answers to these questions on catalysts?

Question

Which of the following statements is true?

A. The rate of all chemical reactions doubles for every 10 oC increase in temperature.

B. Decreasing the activation energy of a reaction decreases the reaction rate.

C. Catalysts increase the reaction rate without getting used up in the reaction.

D. All of the Above

E. None of the Above

 A catalyst that has a different phase than the reactants is a(n) _______.

A. exergonic catalyst

B. endergonic catalyst

C. homogeneous catalyst

D. heterogeneous catalyst

E. autocatalyst

 A catalyst that has the same phase as a least one of the reactants is a(n) _______.

A. exergonic catalyst

B. endergonic catalyst

C. homogeneous catalyst

D. heterogeneous catalyst

E. autocatalyst

 

Catalysts increase the speed of a reaction by _______.

A. lowering the activation energy of the reaction

B. increasing the concentration of the reactants

C. increasing the energy of the reactants

D. increasing the entropy of the reactants

E. increasing the enthalpy of the reactants

The catalytic converter in a car, using Platinum as the catalyst, is an example of a(n) ______.

A. exergonic catalyst

B. endergonic catalyst

C. homogeneous catalyst

D. heterogeneous catalyst

E. autocatalyst

 

Answer 1

I would have to agree with all of your answers. The only nit picking that I would do is regarding the question of catalysts increase the speed of reaction by "lowering the energy of activation." While this is ultimately true, the way they do it is by providing an alternate pathway that has a lower Ea, and not really by lowering the Ea of the same pathway.