Please open the attached file for the list of questions.
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Unit 5 Test
Name:______________ Date:__________
R = 8.314 kPa•L/mol-K 760 mmHg = 101.325 kPa
Part A: Multiple Choice
Circle the letter corresponding to the best answer.
(Knowledge and Understanding = 15 marks)
1. The mathematical statement: “V is directly proportional to n” is equivalent to:
a) Vn = constant.
b) V/n = constant.
c) V+n = constant.
d) V = constant and n = constant.
2. Which of the following is least important in determining the physical behaviour of a gas?
a) chemical composition.
b) temperature.
c) pressure.
d) volume.
e) number of moles.
3. The vapour pressure of a liquid depends on the,
a) area of the exposed surface of the liquid.
b) temperature of the liquid.
c) volume of the container above the liquid.
d) atmospheric pressure.
4. Which is an incorrect ending to the following statement?
According to the kinetic molecular theory:
a) molecules of a gas never collide with each other.
b) the average kinetic energy of the gas molecules is directly proportional to the Kelvin
temperature.
c) collisions are perfectly elastic.
d) collisions between the molecules and the walls of the vessel produce the pressure
of the gas.
e) an ideal gas is composed of molecules that doe not attract each other.
5. Real gases behave most like ideal gases when,
a) the pressure is high and the temperature is low.
b) the pressure is low and the temperature is high.
c) the pressure is low and the temperature is low.
d) the pressure is high and temperature is high.
6. If a sealed one litre jar of gas is cooled, the molecules,
a) move farther apart.
b) collide.
c) increase their vibrational motion.
d) move more slowly.
7. Charles’ Gas Law can be represented by the equation,
a) V1T2 = V2T1
b) V2T2 = V1T1
c) V1P1 = V2P2
d) V1P2 = V2P1
8. The most abundant gas in the earth’s atmosphere is,
a) oxygen.
b) carbon dioxide.
c) water vapour.
d) nitrogen.
9. At constant volume, the pressure of a gas Y increases with temperature because:
a) the molecules of Y move faster.
b) the volume increases.
c) collisions of Y molecules are more elastic.
d) the mass of Y increases.
10. Molecules in the liquid state experience,
a) rotational motion only.
b) vibrational and limited rotational motion only.
c) translational motion only.
d) vibrational, rotational and translational motion.
11. Molecules are always,
a) colourless.
b) made of oxygen.
c) diatomic.
d) in motion.
12. Which of the following statements best accounts for the fact that gases can be easily
compressed?
a) Molecules occupy space.
b) The collisions of molecules are elastic.
c) Molecules of gases are in constant motion.
d) Molecules of gases are relatively far from each other.
13. The state of matter which exhibits definite volume but not definite shape is
a) liquid.
b) gas.
c) solid.
d) fluid.
14. If 2 containers of ideal gases under the same conditions of temperature and pressure
have the same number of molecules, the gas samples must also,
a) be of the same substance.
b) have the same numbers of atoms.
c) have the same mass.
d) have the same volume.
15. Avogadro’s principle states that equal volumes of all gases at the same temperature
and pressure,
a) contain the same number of molecules.
b) contain the same number of atoms.
c) contain the same number of ions.
d) contain the same number of elements.
Part B: Problems
Show your solutions in the space provided below each question.
Thinking marks = 5 x 2 = 10 marks
1. The total pressure in a gas tank is 4000 kPa. Two gases equally produce ¾ of the total
pressure. Find the pressure of the third gas in the tank.
2. A sample of oxygen occupies 11.0 mL under a pressure of 100 kPa at a temperature of
15 °C. What volume will it occupy under at 25 °C?
3. A 100 W light bulb has a volume of 180.0 cm3 at STP. The light bulb is turned on and
the heated glass expands slightly, changing the volume of the bulb to 181.5 cm3 with an
internal pressure of 214.5 kPa. What is the internal temperature of a hot light bulb? 1 cm3 =
1mL
4. A sample of gas has a volume of 150 mL at 260 K and 92.3 kPa. What will the new
volume be at 376 K and 123 kPa?
5. A balloon contains 2.0 L of helium gas at STP. Find the mass of helium present.
