THE GAS LAWS
Directions: For each of the following questions, choose the number that best answers the
question and place it on your answer sheet.
Multiple Choice
1.
2.
3.
What is –100C on the Kelvin scale?
1) 253 K
2) 273 K
3) 283 K
4) +10 K
To change Kelvin temperature to Centigrade temperature
1) add 273;
2) subtract 100;
3) subtract 273;
4) add 373;
5) none of these
5) multiply by 5/9.
To change Centigrade temperature to Kelvin temperature 1) add 273;
2) subtract
100;
3) subtract 273;
4) add 373;
5) multipy by 9/5 and add 32.
4.
The expression “a cubic foot of air” is unsatisfactory because 1) air volume is negligible;
2) air has a very low density;
3) gas volume is dependent on its temperature;
4) gas
volume is difficult to measure; 5) the metric system is more exact.
5.
A toy balloon tends to become spherical when inflated because: 1) gases exert pressure
equally in all directions;
2) the balloon contains carbon dioxide;
3) air tends to be
permeable;
4) the rubber used in balloons contains impurities.
6.
Which gas occupies the largest volume?
1) Gas A: 2 moles at 760 mm and 546 K
3) Gas C: 1 mole at 380 mm and 273 K
2) Gas B: 1 mole at 760 mm and 273 K
4) Gas D: 2 moles at 760 mm and 273 K
7.
A gas has a volume of 100 ml. at a temperature of 270C. At constant pressure, what
volume does this gas occupy at standard temperature?
1) 10.7 ml.
2) 81.9 ml.
3) 91.0 ml.
4) 109.9 ml.
5) 819.0 ml.
8.
Which gas contains molecules with the highest average kinetic energy?
1) Gas A: 2 moles at 273 K
3) Gas C: 1 mole at 500 K
2) Gas B: 1 mole at 293 K
4) Gas D: 2 moles at 546 K
9. At standard pressure, which has the highest average kinetic energy?
1) H2O(g) at 1100C
3) H2O(l) at 250C
0
2) H2O(s) at -10 C
4) H2O(l)  H2O(g) at 700C
5) none of these
10.
Calculate the volume that will be occupied by 360 mL. of hydrogen, measured at 800
mmHg, when the pressure is changed to 720 mmHg.
1) 400 ml.
2) 470 ml.
3) 324 ml.
4) 198 ml.
5) none of these
A gas sample is at 350C. If the pressure remains unchanged, which temperature will cause a
decrease in volume of this gas?
1) 510F
2) 380C
3) 308 K
4) none of these
11.
12. The temperature of a sample of helium gas is a measure of its
1) kinetic and potential energy.
3) average kinetic energy.
2) average potential energy.
4) total potential energy.
13.
If the volume which a certain number of gas molecules occupies remains constant as the
temperature is lowered, then the pressure exerted by this number of molecules
1) remains constant;
2) steadily decreases;
3) steadily increases;
4) first increases and then decreases.
14.
If the temperature is kept constant, what is the new pressure of a gas in terms of the
volume and the original pressure?
1) P2V1
2) V2P1
3) V2V1
4) P1V1
5) none of these
V2
V1
P2
V2
Given 100 ml of gas collected when the temperature is 270C. What volume will this gas
occupy at 1270C if the pressure is constant?
1) 75.0 ml.
2) 470.4 ml.
3) 940.8 ml.
4) 1,200.0 ml.
5 ) none of these
15.
16. Increasing the temperature causes the rate of motion of molecules to
1) increase;
2) decrease;
3) either increase or decrease;
4) remain unchanged.
17.
Doubling the pressure on a gas at the same time that its Kelvin temperature is doubled
causes its volume to
1) decrease by 1/2;
2) decrease by 1/4;
3) remain the same;
4) increase by two times;
5) increase by 4 times.
18.
A gas has a volume of 38.0 ml. when the pressure is 680 mmHg. If the temperature is
constant, what volume will the gas occupy at standard pressure of 1 atm?
1) 1,360.0 ml.
2) 42.5 ml.
3) 34.0 ml.
4) 24.5 ml.
5) none of these
19.
Equal volumes of ideal gases contain the same number of molecules, provided the gases
have equal 1) masses;
2) pressures;
3) temperatures;
4) temperatures
and pressures; 5) masses and temperatures.
20.
A gas has a volume of 91 ml at a temperature of 910C. This gas is kept at constant pressure
but its temperature is reduced to 00C. At this temperature the volume of the gas will be
approximately 1) unchanged;
2) 0 ml;
3) 120 ml;
4) 68 ml.
21.
Calculate the volume that will be occupied by 350 ml. of oxygen, measured at 720 mm,
when the pressure is changed to 630 mm.
1) 200 ml.
2) 270 ml.
3) 306 ml.
4) 360 ml.
5) 400 ml.
22. The pressure exerted by a gas is due to
1) the chemical nature of the container;
2) the color of the gas;
3) the height of the container above sea level;
4) the
diameter of the gas molecules;
5) the collisions of the gas molecules with the
walls of the container.
23.
A cylinder equipped with a movable piston contains 50.0 ml. of a gas. What is the new
volume when the pressure is doubled at constant temperature?
1) 25.0 ml.
2) 50.0 ml.
3) 75.0 ml.
4) 100 ml.
24.
At S.T.P. a volume of air measures 600 ml. Temperature remaining constant, if the
pressure changes to 620 mm, the new volume will be:
1) 500 ml;
2) 490 ml;
3) 735 ml;
4) 820 ml;
5) none of these.
25.
The pressure of a given quantity of gas must increase if
1) the temperature and
volume increase;
2) the temperature and the volume decrease;
3) the temperature
increases and the volume decreases;
4) the temperature decreases and the
volume increases.
26.
If the volume of a gas were decreased in a closed container by increasing the pressure, the
mass would
1) become smaller;
2) become larger;
3) stay the same;
4) increase and then decrease.
27.
If the volume of a gas were increased in a closed container by increasing the temperature,
the mass would
1) become larger;
2) become smaller;
3) decrease
and then increase;
4) stay the same.
28.
What pressure is necessary to convert 330 liters of CO2 at 750 mm. pressure to 420 liters?
The temperature is not changed.
1) 184.8 mm.
2) 589.3 mm.
3) 954.5 mm.
4) none of these
29. The vapor pressure of 25 ml. of water at 250C will be the same as:
1) 50 ml. of water at 250C.
3) 12.5 ml. of water at 500C.
0
2) 25 ml. of water at 50 C.
4) 50 ml. of water at l2.50C.
30.
A sample of gas at 1.00 atmosphere of pressure occupies a volume of 500 liters. If the
volume is decreased to 125 liters and the temperature is held constant, what is the new
pressure in atmospheres?
1) 0.25 atm.
2) 2.00 atm.
3) 1.25 atm.
4) 4.00 atm.
31.
A gas occupies a volume of 2.0 cubic feet at 13 atm. How many cubic feet does this gas
occupy at 1.0 atm, when the temperature is kept constant?
1) 6.5 cu.ft.
2) 13 cu.ft
3) 15 cu.ft
4) 18.2 cu.ft.
5) 26 cu.ft.
A volume of air at 50C measures 150 ml. Pressure remaining constant, if the temperature
goes up 100C, the new volume will be:
1) 145 ml;
2) 155 ml;
3) 500 ml;
4) 125 ml.
32.
A gas sample is at 220C. If the pressure remains unchanged, which temperature will
increase the volume of this gas?
1) 420F
2) 251 K
3) 295 K
4) all of these
5) none of these
33.
Find the temperature capable of expanding 2.5 liters of chlorine at 180C and 0.9 atm. to 5.2
liters. No change in pressure took place.
1) 37.4 K
2) 140.0 K
3) 380.6 K
4) 605.3 K
34.
What temperature is required to change 175 ml. of a gas at 260C to 150 ml. The pressure is
not changed.
1)-16.70C
2) 22.30C
3) 24.50C
4) 348.80C
5) none of these
35.
A gas sample is at 100C. If the pressure remains constant, the volume will increase when
the temperature is changed to
1) 263 K;
2) 283 K;
3) 200F;
4) none of these.
36.
37. As the temperature of a gas increases, the molecules
1) move more rapidly;
2) exert less pressure;
3) occupy a smaller volume;
4) lose energy.
38. As a liquid evaporates from an open container at 700C,
1) the liquid becomes
warmer; 2) the molecules of the liquid decompose;
3) molecules return to
the surface as fast as they leave;
4) the vapor molecules have greater kinetic
energy than the liquid molecules remaining.
39.
At constant temperature, what pressure is used to reduce 220 liters of nitrogen at 2.5
atmospheres to 190 liters?
1) 2.9 atm.
2) 20.2 atm.
3) 57.9 atm.
4) 16,720 atm.
40.
At S.T.P. a sample of air measures 6 ml. Temperature remaining constant, the sample will
have a volume of 3 ml. when the pressure is: 1) 1 atmosphere;
2) 2 atmospheres;
3) 3 atmospheres;
4) 4 atmospheres.
41. Variations in the volume of a given substance are most marked when the substance is
1) a liquid;
2) a solid;
3) a gas;
4) a crystalline material.
A gas has a volume of 182 ml at a temperature of 1820C. The gas is kept atconstant
pressure but its temperature is increased to 2730C. At this temperature the volume of the
gas will be approximately
1) unchanged;
2) 273 ml;
3) 546 ml;
4) 152 ml;
5) 218 ml.
42.
43.
If the pressure exerted on a certain number of gas molecules remains constant while the
temperature decreases, then the volume occupied
1) remains
constant;
2) steadily increases;
3) steadily decreases;
4) first increases
and then decreases;
5) first decreases and then increases.
44.
If the pressure remains the same, find the new temperature needed to convert 410 ml. of a
gas at 550C to 500 ml.
1) 67.10C
2) 82.30C
3) 127.00C
4) 268.90C
45. Which of the following is a principle of the kinetic-molecular theory?
1) Molecules of a gas bond together following collisions.
2) As temperature decreases, gas molecules maintain constant velocities.
3) Strong forces of attraction exist between molecules of a gas.
4) The distances between molecules of a gas are much greater than the diameters
of the molecules.
46.
A gas has a volume of 57 ml. when the pressure is 640 mm. What volume will the gas
occupy at standard pressure when the temperature is unchanged?
1) 36 ml.
2) 48 ml.
3) 56 ml.
4) 67.7 ml.
5) 81.5 ml.
47.
If the volume which a certain number of gas molecules occupies remains constant, as the
temperature is raised the pressure exerted by the gas
1) remains constant;
2) steadily increases;
3) steadily decreases;
4) first decreases and then increases;
5) first increases and then decreases.
48.
If the volume of a gas were increased in a closed container by reducing the pressure, the
mass would 1) become larger;
2) stay the same;
3) become smaller;
4) increase and then decrease.
49.
If the volume of a gas is constant, express P2 to show the temperature change of a gas is
directly proportional to the change in pressure.
1) T1 x P1
2) P2 x T2
3) T2 x P1
4) Ti x P2
5) none of these
T2
T1
T1
T2
50. If 100 ml. of a gas at -730C are heated to 270C, what is the new volume?
1) -37 ml.
2) 47 ml.
3) 85 ml.
4) 150 ml.
5) 167 ml.
Hydrogen has a volume of 400 ml at 270C. At standard temperature the expression representing the volume is:
1) 400 x 27
2) 400 x 760
3) 760 x 400
4) 400 x 273
27
27
300
300
51.
A volume of air at 200C measures 200 ml. Pressure remaining constant, if the temperature
drops to 00C, the new volume will be:
1) 100 ml;
2) 186 ml;
3) 214 ml;
4) 200 ml.
52.
Given 100 ml of gas collected when the temperature is -230C. If the pressure is kept
constant, what volume will the gas occupy at 270C?
1) 48 ml.
2) 84 ml.
3) 90 ml.
4) 120 ml.
5) 150 ml.
53.
A gas collected when the temperature is 110C and the pressure is 710 mm measures 1,480
ml. Calculate its volume at 200C and 740 mm.
1) 750 ml.
2) 975 ml.
3) 1,350 ml.
4) 1,465 ml.
54.
A gas occupies a volume of 2.0 liters at S.T.P. At a temperature of 200C and a pressure of
2.0 atmospheres the new volume will be:
1) 0.93 liter;
2) 1.07 liters;
3) 1.35 liters;
4) 2.68 liters;
5) 4.29 liters.
55.
ANSWERS:
[1]
5
[12] 3
[23] 1
[34] 4
[45] 4
[2]
3
[13] 2
[24] 3
[35] 1
[46] 2
[3]
1
[14] 4
[25] 3
[36] 4
[47] 2
[4]
3
[15] 5
[26] 3
[37] 1
[48] 2
[5]
1
[16] 1
[27] 4
[38] 4
[49] 3
[6]
1
[17] 3
[28] 2
[39] 1
[50] 4
[7]
3
[18] 3
[29] 1
[40] 2
[51] 4
[8]
4
[19] 4
[30] 4
[41] 3
[52] 2
[9]
1
[20] 4
[31] 5
[42] 5
[53] 4
[10] 1
[21] 5
[32] 2
[43] 3
[54] 4
[11] 1
[22] 5
[33] 5
[44] 3
[55] 2