230_F09_exam1_blank - CHEM 230 F09 Exam 1 p1 Name*Note this...

CHEM 230 F09 Exam 1 p1 Name:_____________________
*Note this exam proved to be too long for 90 minutes. It also include questions on Gibbs free
energy and spontaneity which we will not have time to cover before the first exam this Winter, so
you can save those questions for Exam 2.
For questions 1-17, place the correct letter (or other information requested) on the answer sheet.
1) In an experiment a gas is heated up and gains 65 J of heat from the surroundings. As the gas
heats up, it does work on the surroundings equal to 22J. What are q , w , and Δ U for the
conditions described in this experiment?
2) Which of the following are TRUE:
The behavior of a real gas is expected to deviate from that of an ideal gas when:
(1) The temperature of the gas is very high.
(2) The pressure of the gas is much higher than 1 atm.
(3) The compression factor of the gas = 1.
(4) Several different kinds of gases are present in the same container.
A. (1) only
B. (2) only
C. (3) only
D. (3) and (4)
E. All are false
3) Based on the kinetic theory of gases, the rate of diffusion of N
2
at 25
o
C would be _______
times that of CO
2
at 75
o
C .
4) A marshmallow (which contains air trapped in tiny cells in its elastic carbohydrate structure)
is placed inside a glass container. A vacuum pump connected to the container is used to remove
air from the container. What change if any is observed in the marshmallow?
A. It is compressed and gets smaller.
B. It expands and gets larger
C. It stays the same size.
5) The same mass of each element/compound listed below is used to fill a balloon at atmospheric
pressure and room temperature. The balloon containing which element/compound will be the
largest?

6) To which series of molecules below would you assign the ordered sequence of van der Waals
a and b parameters. It may help you to know that for HCl, a is 3.716 and for HBr, a is 4.510.