Chem 051 - Fundamentals of Chemistry » Winter 2021 » Homework Week 3
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Question #1
If the temperature is 20. °C, what is the corresponding temperature on the Fahrenheit scale?
A.
43 °F
B.
94 °F
C.
239 °F
D.
68 °F
E.
-22 °F
Question #2
When some of the sugar added to iced tea remains undissolved at the bottom of the glass, the solution is
A.
unsaturated.
B.
saturated.
C.
dilute.
D.
nonpolar.
E.
polar.
Question #3
The temperature of liquid nitrogen is -196 °C. What is the corresponding reading on the Kelvin scale?
A.
77 K
B.
-91 K
C.
48 K
D.
146 K
E.
-127 K
Question #4
How many grams of glucose are needed to prepare 400. mL of a 2.0%(m/v) glucose solution?
A.
2.0 g
B.
0.0050 g
C.
200. g
D.
8.0 g
E.
800. g
Question #5
A temperature of 41 °F is the same as
A.
-9 °C.
B.
16 °C.
C.
5 °C.
D.
42 °C.
E.
310 °C.
Question #6
Helium is a(n)
A.
heterogeneous mixture.
B.
electron.
C.
compound.
D.
homogeneous mixture.
E.
element.
Question #7
How many calories are required to raise the temperature of a 150. g sample of gold from 25 °C to 175 °C? The specific heat of gold is 0.0308 cal/g °C.
A.
116 cal
B.
693 cal
C.
130. cal
D.
4.62 cal
E.
22500 cal
Question #8
Which of the following is not a characteristic of the solid state?
A.
particles are close together
B.
has a definite shape
C.
has a definite volume
D.
particles are moving very fast
E.
particles are in fixed positions
Question #9
Which of the following is an element?
A.
water
B.
salt
C.
tin
D.
iced tea
E.
sugar
Question #10
The specific heat of a substance is the amount of heat needed to
A.
change 1 g of the substance from the liquid to the solid state.
B.
convert 1 g of a solid to a gas.
C.
convert 1 g of a liquid to gas.
D.
raise the temperature of 1 g of the substance by 1 °C.
E.
change 1 g of the substance from the solid to the liquid state.
Question #11
The mass percent concentration refers to
A.
grams of solute in 100 g of solution.
B.
grams of solute in 1 kg of solvent.
C.
grams of solute in 1 kg of solution.
D.
grams of solvent in 100 g of solution.
E.
grams of solute in 100 g of solvent.
Question #12
In a solution, the solvent
A.
can be a solid, liquid, or gas.
B.
is the substance present in the smallest concentration.
C.
is never a solid.
D.
is a liquid.
E.
can be a liquid or gas.
Question #13
The phrase "ability to do work" is a definition of
A.
calorie.
B.
cooling.
C.
specific heat.
D.
heating.
E.
energy.
Question #14
Which of the following would not be a physical change?
A.
freezing water to make ice cubes
B.
tearing a piece of aluminum foil
C.
boiling water for soup
D.
melting gold to make jewelry
E.
burning gasoline in a lawnmower
Question #15
On a hot day, the thermometer read 95 °F. What is the temperature in degrees Celsius?
A.
178 °C
B.
63 °C
C.
77 °C
D.
35 °C
E.
113 °C
Question #16
In water, a substance that ionizes completely in solution is called a
A.
semiconductor.
B.
weak electrolyte.
C.
nonconductor.
D.
nonelectrolyte.
E.
strong electrolyte.
Question #17
If the heat of fusion for water is 80. cal/g, how many calories are needed to melt 45.0 g of ice at 0 °C?
A.
3.6 cal
B.
80. cal
C.
1.8 cal
D.
0.56 cal
E.
3.6 x 103 cal
Question #18
A serving of fish contains 50 g protein and 4 g of fat. If protein has a caloric value of 4 kcal/g and fat has 9 kcal/g, how many kcal are in the serving? Give the answer to 2 significant figures.
A.
54 kcal
B.
470 kcal
C.
220 kcal
D.
490 kcal
E.
240 kcal
Question #19
Gold in a ring is a(n)
A.
compound.
B.
homogeneous mixture.
C.
element.
D.
heterogeneous mixture.
E.
none of the above
Question #20
In which of the following would the particles move most rapidly?
A.
boiling water
B.
ice at -20 °C
C.
water at 20 °C
D.
steam at 110 °C
E.
ice at 0 °C
Question #21
Which one of the following properties describes a liquid?
A.
There is essentially no interaction between the particles.
B.
particles move very rapidly
C.
fills the entire volume of the container
D.
has its own shape
E.
particles are close together and move randomly
Question #22
In a gas, the distance between the particles is
A.
close relative to the size of the molecules.
B.
very close relative to the size of the molecules.
C.
small relative to the size of the molecules.
D.
fixed relative to the size of the molecules.
E.
very large relative to the size of the molecules.
Question #23
Coins in a piggy bank are an example of a(n)
A.
compound.
B.
homogeneous mixture.
C.
element.
D.
heterogeneous mixture.
E.
none of the above
Question #24
Which of the following is a physical change?
A.
baking a cake
B.
a tomato ripening
C.
fermenting grapes to produce wine
D.
digesting a meal
E.
dry ice subliming
Question #25
Which of the following quantities is not required to calculate the amount of heat energy required to heat water from 25 °C to 55 °C?
A.
the specific heat of water
B.
the mass of the water sample
C.
the final temperature
D.
the initial temperature
E.
the heat of vaporization for water
Question #26
Which of the following does not involve a change of state?
A.
freezing water
B.
sublimation of dry ice
C.
melting ice
D.
vaporization of alcohol
E.
pouring water into a vacuum-insulated bottle
Question #27
What is the concentration, mass/volume percent (m/v), of a solution prepared from 50. g NaCl and 2.5 L of water?
A.
20%
B.
2.0%
C.
0.050%
D.
0.020%
E.
5.0%
Question #28
An example of kinetic energy is
A.
a tree.
B.
running water.
C.
natural gas.
D.
a coiled spring.
E.
chemical energy.
Question #29
On a heating curve a plateau corresponds to
A.
a change in temperature of a liquid.
B.
a change in temperature of a solid.
C.
a change of state.
D.
the solid being broken into smaller pieces.
E.
a change in temperature of a gas.
Question #30
Which of the following is a heterogeneous mixture?
A.
sugar
B.
noodle soup
C.
carbon
D.
water
E.
tea
Question #31
The physical state(s) present when a substance is melting is (are)
A.
gas.
B.
solid + liquid.
C.
liquid + gas.
D.
solid.
E.
liquid.
Question #32
650. J is the same amount of energy as ________.
A.
2.72 cal
B.
650. cal
C.
2720 cal
D.
1550 cal
E.
155 cal
Question #33
A heating curve illustrates
A.
the changes in the temperature and physical state of a substance as it is heated.
B.
the chemical changes that occur as the substance is heated.
C.
what happens to the particles of a substance as it is heated.
D.
what a substance looks like as it is heated.
E.
what happens to the heat applied as the temperature is increased.
Question #34
Which of the following is an example of a physical change?
A.
converting water to hydrogen and oxygen
B.
baking a cake
C.
grinding coffee beans
D.
burning coal
E.
digesting a cheeseburger
Question #35
The formation of a gas resulting from the escape of high-energy particles from the surface of a liquid is known as
A.
deposition.
B.
evaporation.
C.
sublimation.
D.
boiling.
E.
melting.
Question #36
What volume of 2.5% (m/v) KOH can be prepared from 125 mL of a 5.0% KOH solution?
A.
0.10 mL
B.
63 mL
C.
125 mL
D.
0.0040 mL
E.
250 mL
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