Chem 1020 2012 Final

(CHEM1020)[2012](f)final~mhlamab^_32848.pdf downloaded by cptsang from http://petergao.net/ustpastpaper/down.php?course=CHEM1020&id=0 at 2014-10-19 05:13:38. Academic use within HKUST only.

The Hong Kong University of Science and Technology

DEPARTMENT OF CHEMISTRY

Name:

Student ID:

(Last name, First name)

Chem 1020

General Chemistry 1B

Final Examination

Date: Wednesday, December 12th, 2012

Time Allowed:

120 minutes

Total Points:

100 points

-

1

(CHEM1020)[2012](f)final~mhlamab^_32848.pdf downloaded by cptsang from http://petergao.net/ustpastpaper/down.php?course=CHEM1020&id=0 at 2014-10-19 05:13:38. Academic use within HKUST only.

Section I. Multiple Choices [2 points each, 64 points total]

For each question, select the most appropriate answer by either writing the letter out in

the empty box OR by circling your choice.

1.

The diatomic molecule Ne2 appears not to exist. Based on the molecular orbital

theory, it is probably because

A) Ne2 is not magnetic and therefore is un-stable.

B) the overlap of the p orbitals leads only to antibonding molecular orbitals.

C) the number of bonding electrons equals the number of antibonding electrons

resulting in zero bonds in Ne2.

D) more than one of them

2.

For a particular process in which q = –17 kJ and w = 21 kJ. Which of the following

statement(s) is/are false?

A)

B)

C)

D)

E)

3.

An increase in the temperature of the reactants causes an increase in the rate of

reaction. The best explanation is: As the temperature increases:

A)

B)

C)

D)

E)

4.

Heat flows from the system to the surroundings.

The system does work on the surroundings.

E = +4 kJ

The process is exothermic.

None of the above is false.

the concentration of reactants increases.

the activation energy decreases.

the collision frequency increases.

the fraction of collisions with total kinetic energy > Ea increases.

the activation energy increases.

Which of the following...