CHEM 162 EXAM 1 PRACTICE TEST QUESTIONS AND ANSWERS

CHEM 162 EXAM 1 PRACTICE TEST
QUESTIONS AND ANSWERS



For the reaction: X + Y → Z ; the rate law is: rate = k[X]2[Y]. To double the reaction
rate :
A. double the concentration of Z
B. double the concentration of Y
C. double the concentration of X - Correct Answers -double the concentration of Y

115 grams of H2SO4 is dissolved in 500.0mL of water. What is the Normality of the
resulting solution? (assume all H+ enter the solution)
A. 2.3
B. 4.7
C. 11.5 - Correct Answers -B. 4.7

The density of CO2 gas at STP is:

A. 986 g/L
B. 1.96 g/L
C. 0.509 g/L - Correct Answers -B. 1.96 g/L

Some elements are more reactive than others

True
False - Correct Answers -True

500mL of a gas at 25.0oC will have a volume of 1.20L at:

A. 124 K
B. 900 K
C. 442 oC - Correct Answers -C. 442 oC

The initial volume of a gas cylinder is 750.0 mL. If the pressure of a gas inside the
cylinder changes from 840.0 mmHg to 360.0 mmHg, what is the final volume the gas
occupies?

A. 630.0 mL
B. 321.4 mL
C. 3.151 L

, D. 1.750 L
E. none of the above - Correct Answers -D. 1.750 L

At STP, 12.69 g of a noble gas occupies 14.09 L. What is the identity of the noble gas?
A. Ar
B. He
C. Kr
D. Ne
E. not enough information - Correct Answers -D. Ne

A barometer uses mercury because:
A. it is a convenient, safe, lightweight material.
B. it is the only liquid metal at room temperature.
C. it is the traditional substance used, water could be as easily used.
D. the density of mercury is very large which allows the barometer to be short.
E. All of the above are true. - Correct Answers -D. the density of mercury is very large
which allows the barometer to be short.

You need to prepare 2.00 L of 0.100 M Na2CO3 solution. The best procedure is to
weigh out
A. 10.6 g Na2CO3 and add water until the final solution has a volume of 2.00 L.
B. 10.6 g Na2CO3 and add 2.00 L of water to it.
C. 21.2 g Na2CO3 and add water until the final solution has a volume of 2.00 L.
D. 21.2 g Na2CO3 and add 2.00 L of water to it. - Correct Answers -C. 21.2 g Na2CO3
and add water until the final solution has a volume of 2.00 L

A possible rate law for: SO2Cl2 → SO2 + Cl2 is:

A. rate = k[SO2Cl2]X
B. rate = k[SO2Cl2]y[Cl2]X
C. rate = k[SO2]y[Cl2]X - Correct Answers -A. rate = k[SO2Cl2]X

The pressure of a gas is 1216 mmHg. What is its pressure in atm?

A. 1960 atm
B. 912000 atm
C. 1.6 atm - Correct Answers -C. 1.6 atm

O2 gas at 25oC has pressure of 1.1 atm has density of:

A. 0.0019 g/L
B. 0.72 g/L
C. 1.4 g/L - Correct Answers -C. 1.4 g/L

One mole O2(g) at 0oC and 1atm pressure will have a volume of 22.4L