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