Page 365 - SUBSEC October 2017_Neat

- 6 -

Item 19 refers to the graph below which
shows the Boltzmann distribution of
kinectic energies in a gas.

19. Which of the following statements are
correct for the Boltzmann distribution?

Increasing temperature

I. causes the maximum of the curve to
move to the right
II. increases the number of molecules
III. increases the number of molecules
with energy greater than the
activation energy

(A) I and II only
(B) I and III only
(C) II and III only
(D) I, II and III

20. Based on Le Chatelier’s principle, which combination of obervations is NOT true?

Type of Reaction Temperature Effect on K c Effect on Reactants
Change
(A) Endothermic decrease decrease increase
(B) Endothermic increase increase decrease
(C) Exothermic increase increase decrease
(D) Exothermic decrease increase decrease

GO ON TO THE NEXT PAGE
02112010/CAPE/SPEC/2017