Chem 051 - Fundamentals of Chemistry » Winter 2021 » Exam 3
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Question #1
Carbohydrates and proteins have the same caloric value per gram.
A.
TRUE
B.
FALSE
Question #2
How many calories are required to raise the temperature of a 35.0 g sample of iron from 25 °C to 35 °C? Iron has a specific heat of 0.108 cal/g °C.
A.
93 cal
B.
1.1 cal
C.
38 cal
D.
3.8 cal
E.
130 cal
Question #3
Which of the following is a physical change?
A.
baking a cake
B.
a tomato ripening
C.
fermenting grapes to produce wine
D.
dry ice subliming
E.
digesting a meal
Question #4
At STP conditions, 11 g of SO2 have a volume of
A.
130 L.
B.
0.0076 L.
C.
22 L.
D.
250 L.
E.
3.8 L.
Question #5
On a heating curve a plateau corresponds to
A.
the solid being broken into smaller pieces.
B.
a change in temperature of a gas.
C.
a change in temperature of a solid.
D.
a change in temperature of a liquid.
E.
a change of state.
Question #6
A cyclopropane-oxygen mixture is used as an anesthetic. If the partial pressure of cyclopropane in the mixture is 330 mm Hg and the partial pressure of the oxygen is 1.0 atm, what is the total pressure of the mixture in torr?
A.
330 torr
B.
1.4 torr
C.
760 torr
D.
430 torr
E.
1100 torr
Question #7
Which of the following does not represent a step on the heating curve of water?
A.
The temperature of steam cannot exceed 100 °C.
B.
The temperature of ice remains at 0 °C as it melts.
C.
Both liquid water and ice are present at 0 °C.
D.
The temperature of liquid water remains at 100 °C as it boils.
E.
The temperature of liquid water increases linearly as it is heated.
Question #8
Raising the temperature of 10.0 g of water from 10.0 °C to 20.0 °C requires 100.0 cal of energy, while raising the temperature of 10.0 g of aluminum from 10.0 °C to 20.0 °C requires 22.0 cal. More calories are required to heat the water because
A.
10.0 °C is closer to the melting point of water than to the melting point of aluminum.
B.
ten grams of water occupies a larger volume than 10.0 g of aluminum.
C.
water has a larger specific heat than aluminum.
D.
water is a liquid and aluminum is a solid at 10.0 °C.
E.
water has a greater potential energy than aluminum.
Question #9
Coins in a piggy bank are an example of a(n)
A.
heterogeneous mixture.
B.
compound.
C.
homogeneous mixture.
D.
element.
E.
none of the above
Question #10
At STP, how many moles of helium would occupy 1.00 L?
A.
22.4 moles
B.
2.24 moles
C.
0.446 moles
D.
224 moles
E.
0.0446 moles
Question #11
A compound only contains one type of atom.
A.
TRUE
B.
FALSE
Question #12
What is the concentration, mass/volume percent (m/v), of a solution prepared from 50. g NaCl and 2.5 L of water?
A.
0.050%
B.
5.0%
C.
2.0%
D.
20%
E.
0.020%
Question #13
The unit of 1 atmosphere used to describe the pressure of a gas is equal to
A.
600 mm Hg.
B.
100 mm Hg.
C.
200 mm Hg.
D.
1 mm Hg.
E.
760 mm Hg.
Question #14
How many calories are required to increase the temperature of 13 g of alcohol from 11 °C to 23 °C? The specific heat of alcohol is 0.59 cal/g °C.
A.
170 cal
B.
0.63 cal
C.
0.54 cal
D.
92 cal
E.
83 cal
Question #15
A mixture is prepared by dissolving 2 g of KCl in 100 g of H2O. In this mixture, H2O is the
A.
solute.
B.
solid.
C.
solution.
D.
solvent.
E.
ionic compound.
Question #16
Which one of the following properties describes a liquid?
A.
particles move very rapidly
B.
has its own shape
C.
particles are close together and move randomly
D.
fills the entire volume of the container
E.
There is essentially no interaction between the particles.
Question #17
The pressure of 5.0 L of gas increases from 1.50 atm to 1240 mm Hg. What is the final volume of the gas, assuming constant temperature?
A.
4.6 L
B.
0.0060 L
C.
5.4 L
D.
5.0 L
E.
4100 L
Question #18
STP stands for 0 °C and 760 mm Hg.
A.
FALSE
B.
TRUE
Question #19
As heat is removed from a solid, its temperature decreases.
A.
TRUE
B.
FALSE
Question #20
Which of the following is an example of a physical change?
A.
digesting a cheeseburger
B.
converting water to hydrogen and oxygen
C.
baking a cake
D.
grinding coffee beans
E.
burning coal
Question #21
The force of gas particles against the walls of a container is called
A.
volume.
B.
temperature.
C.
density.
D.
pressure.
E.
quantity of gas.
Question #22
The physical state(s) present when a substance is melting is (are)
A.
solid.
B.
liquid + gas.
C.
liquid.
D.
solid + liquid.
E.
gas.
Question #23
Which of the following is an example of potential energy?
A.
a fan blade turning
B.
riding an exercise bike
C.
chewing food
D.
water stored in a reservoir
E.
burning wood
Question #24
When a solid is converted directly to a gas, the change of state is called
A.
melting.
B.
freezing.
C.
condensation.
D.
sublimation.
E.
boiling.
Question #25
Which of the following is a property of a solid?
A.
The interactions between its particles are very weak.
B.
It fills the volume of the container.
C.
The particles move at a rapid rate.
D.
It takes the shape of the container.
E.
The particles have fixed positions and are very close together.
Question #26
The dietary calorie(Cal) is equal to
A.
1000 calories.
B.
1 calorie.
C.
100 calories.
D.
10 calories.
E.
1000 kilocalories.
Question #27
A 5.00-L tank contains helium gas at 1.50 atm. What is the pressure of the gas in mm Hg?
A.
507 mm Hg
B.
760 mm Hg
C.
1140 mm Hg
D.
1.50 mm Hg
E.
3800 mm Hg
Question #28
The formation of a gas resulting from the escape of high-energy particles from the surface of a liquid is known as
A.
evaporation.
B.
melting.
C.
sublimation.
D.
deposition.
E.
boiling.
Question #29
The speed of gas molecules is related to the volume of the container.
A.
FALSE
B.
TRUE
Question #30
The pressure increases as the volume increases, if temperature does not change.
A.
TRUE
B.
FALSE
Question #31
The phrase "ability to do work" is a definition of
A.
energy.
B.
specific heat.
C.
cooling.
D.
heating.
E.
calorie.
Question #32
The specific heat of a substance is the amount of heat needed to
A.
convert 1 g of a liquid to gas.
B.
raise the temperature of 1 g of the substance by 1 °C.
C.
convert 1 g of a solid to a gas.
D.
change 1 g of the substance from the solid to the liquid state.
E.
change 1 g of the substance from the liquid to the solid state.
Question #33
If the heat of vaporization for water is 540 cal/g, how many kilocalories are released when 5.00 g of steam is converted to liquid at 100°C
A.
5.0 kcal
B.
540 kcal
C.
5.4 kcal
D.
2.7 kcal
E.
110 kcal
Question #34
According to Avogadro's law,
A.
the volume of a gas is inversely related to the number of moles at constant temperature and pressure.
B.
the volume of a gas is inversely related to the number of moles at standard temperature and pressure.
C.
the volume of a gas depends only on the temperature and pressure.
D.
the volume of a gas is directly related to the number of moles at constant temperature and pressure.
E.
the volume of a gas depends only on the number of moles in the sample.
Question #35
Which measurement describes the pressure of a gas?
A.
2.5 L
B.
725 mm Hg
C.
315 K
D.
0.45 moles
E.
1.2 g/L
Question #36
One gram of fat has less energy that one gram of protein.
A.
FALSE
B.
TRUE
Question #37
The mass percent concentration refers to
A.
grams of solute in 1 kg of solution.
B.
grams of solvent in 100 g of solution.
C.
grams of solute in 100 g of solvent.
D.
grams of solute in 1 kg of solvent.
E.
grams of solute in 100 g of solution.
Question #38
At STP, what is the volume of 1.0 mole of carbon dioxide?
A.
1.00 L
B.
12.2 L
C.
44.0 L
D.
273 L
E.
22.4 L
Question #39
The energy associated with the motion of particles in a substance is called
A.
temperature.
B.
electrical energy.
C.
potential energy.
D.
chemical energy.
E.
heat.
Question #40
What temperature scale is used in gas law calculations?
A.
either Celsius or Fahrenheit
B.
Celsius
C.
either Celsius or Kelvin
D.
Fahrenheit
E.
Kelvin
Question #41
In a gas, the distance between the particles is
A.
very close relative to the size of the molecules.
B.
very large relative to the size of the molecules.
C.
fixed relative to the size of the molecules.
D.
close relative to the size of the molecules.
E.
small relative to the size of the molecules.
Question #42
The pressure exerted by a gas on its container is inversely related to its Kelvin temperature.
A.
FALSE
B.
TRUE
Question #43
Rubbing alcohol is 70.% isopropyl alcohol by volume. How many mL of isopropyl alcohol are in a 1 pint (473 mL) container?
A.
330 mL
B.
70. mL
C.
0.15 mL
D.
470 mL
E.
680 mL
Question #44
The temperature of a 500. mL sample of gas increases from 150. K to 350. K. What is the final volume of the sample of gas, if the pressure in the container is kept constant?
A.
110. mL
B.
210. mL
C.
0.00474 mL
D.
1170 mL
E.
0.00950 mL
Question #45
At constant temperature, a sample of helium at 760. torr in a closed container was compressed from 5.00 L to 3.00 L. What was the new pressure exerted by the helium on its container?
A.
2280 torr
B.
3800 torr
C.
15.0 torr
D.
800. torr
E.
1270 torr
Question #46
One cup of kidney beans contains 15 g of protein, 1 g of fat, and 42 g of carbohydrate. How many kilocalories, to two significant figures, does this sample contain? (The caloric values are: 4 kcal/g for carbohydrate, 9 kcal/g for fat, and 4 kcal/g for protein.)
A.
520 kcal
B.
60. kcal
C.
240 kcal
D.
88 kcal
E.
230 kcal
Question #47
3.25 kcal is the same amount of energy as ________.
A.
13.6 J
B.
0.777 J
C.
777 J
D.
13600 J
E.
3.25 J
Question #48
The volume of 1 mole of any gas at STP is 22.4 L.
A.
FALSE
B.
TRUE
Question #49
Black coffee is a homogeneous mixture.
A.
TRUE
B.
FALSE
Question #50
A sample of nitrogen gas had a volume of 500. mL, a pressure in its closed container of 740 torr, and a temperature of 25 °C. What was the new volume of the gas when the temperature was changed to 50 °C and the new pressure was 760 torr?
A.
240 mL
B.
530 mL
C.
970 mL
D.
400 mL
E.
450 mL
Question #51
A gas sample contains 4.0 g of CH4 and 2.0 g of He. What is the volume of the sample at STP?
A.
5.6 L
B.
130 L
C.
30. L
D.
11 L
E.
17 L
Question #52
At 570. mm Hg and 25 °C, a gas sample has a volume of 2270 mL. What is the final pressure (in mm Hg) at a volume of 1250 mL and a temperature of 175 °C?
A.
690 mm Hg
B.
210 mm Hg
C.
7000 mm Hg
D.
470 mm Hg
E.
1560 mm Hg
Question #53
Which of the following is not a characteristic of the solid state?
A.
has a definite volume
B.
particles are close together
C.
has a definite shape
D.
particles are moving very fast
E.
particles are in fixed positions
Question #54
A gas contained in a steel tank has a pressure of 1.5 atm at a temperature of 320 K. What will be the gas pressure when the temperature changes to 450 K?
A.
1.5 atm
B.
1.1 atm
C.
0.94 atm
D.
0.47 atm
E.
2.1 atm
Question #55
The gas with an initial volume of 24.0 L at a pressure of 565 mmHg is compressed until the volume is 16.0 L. What is the final pressure of the gas, assuming the temperature does not change?
A.
500. mmHg
B.
377 mmHg
C.
760 mmHg
D.
848 mmHg
E.
465 mmHg
Question #56
Condensation occurs when a liquid is converted to a solid.
A.
TRUE
B.
FALSE
Question #57
What is the concentration, in mass percent (m/m), of a solution prepared from 50.0 g NaCl and 150.0 g of water?
A.
3.00%
B.
33.3%
C.
25.0%
D.
0.250%
E.
40.0%
Question #58
How many moles of neon occupy a volume of 14.3 L at STP?
A.
32.0 moles
B.
0.638 moles
C.
6.45 moles
D.
1.57 moles
E.
36.7 moles
Question #59
A cheeseburger from a fast food restaurant contains 19 g of fat, 20 g of carbohydrate, and 28 g of protein. How many kcal of energy does the cheeseburger contain? (The caloric values are: 4 kcal/g for carbohydrate, 9 kcal/g for fat, and 4 kcal/g for protein.) Give the answer to 2 significant figures.
A.
630 kcal
B.
280 kcal
C.
17 kcal
D.
70. kcal
E.
360 kcal
Question #60
As a solid melts, its temperature does not change
A.
TRUE
B.
FALSE
Question #61
A heating curve illustrates
A.
what happens to the heat applied as the temperature is increased.
B.
the changes in the temperature and physical state of a substance as it is heated.
C.
the chemical changes that occur as the substance is heated.
D.
what a substance looks like as it is heated.
E.
what happens to the particles of a substance as it is heated.
Question #62
The energy stored in chemical bonds is
A.
specific heat.
B.
kinetic energy.
C.
potential energy.
D.
a calorie.
E.
work.
Question #63
Which of the following is a physical change?
A.
natural gas burns
B.
food digests
C.
iron rusts
D.
sugar caramelizes
E.
ice melts
Question #64
A tank contains helium gas at 490 mm Hg, nitrogen gas at 0.75 atm, and neon at 520 torr. What is the total pressure in atm?
A.
1.0 x 103 atm
B.
1600 atm
C.
1.5 atm
D.
2.1 atm
E.
0.55 atm
Question #65
In which of the following would the particles move most rapidly?
A.
ice at 0 °C
B.
water at 20 °C
C.
steam at 110 °C
D.
boiling water
E.
ice at -20 °C
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