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.
-22 °F
C.
68 °F
D.
94 °F
E.
43 °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.
polar.
C.
nonpolar.
D.
dilute.
E.
saturated.
Question #3
The temperature of liquid nitrogen is -196 °C. What is the corresponding reading on the Kelvin scale?
A.
77 K
B.
146 K
C.
-127 K
D.
48 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.
0.0050 g
B.
2.0 g
C.
800. g
D.
200. g
E.
8.0 g
Question #5
A temperature of 41 °F is the same as
A.
5 °C.
B.
42 °C.
C.
16 °C.
D.
-9 °C.
E.
310 °C.
Question #6
Helium is a(n)
A.
compound.
B.
element.
C.
electron.
D.
heterogeneous mixture.
E.
homogeneous mixture.
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.
693 cal
B.
130. cal
C.
116 cal
D.
22500 cal
E.
4.62 cal
Question #8
Which of the following is not a characteristic of the solid state?
A.
particles are in fixed positions
B.
particles are moving very fast
C.
particles are close together
D.
has a definite volume
E.
has a definite shape
Question #9
Which of the following is an element?
A.
sugar
B.
iced tea
C.
water
D.
salt
E.
tin
Question #10
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.
change 1 g of the substance from the liquid to the solid state.
D.
change 1 g of the substance from the solid to the liquid state.
E.
convert 1 g of a solid to a gas.
Question #11
The mass percent concentration refers to
A.
grams of solute in 100 g of solvent.
B.
grams of solvent in 100 g of solution.
C.
grams of solute in 100 g of solution.
D.
grams of solute in 1 kg of solvent.
E.
grams of solute in 1 kg of solution.
Question #12
In a solution, the solvent
A.
can be a liquid or gas.
B.
is the substance present in the smallest concentration.
C.
is a liquid.
D.
is never a solid.
E.
can be a solid, liquid, or gas.
Question #13
The phrase "ability to do work" is a definition of
A.
cooling.
B.
calorie.
C.
energy.
D.
specific heat.
E.
heating.
Question #14
Which of the following would not be a physical change?
A.
tearing a piece of aluminum foil
B.
boiling water for soup
C.
freezing water to make ice cubes
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.
77 °C
B.
63 °C
C.
178 °C
D.
35 °C
E.
113 °C
Question #16
In water, a substance that ionizes completely in solution is called a
A.
nonelectrolyte.
B.
semiconductor.
C.
strong electrolyte.
D.
nonconductor.
E.
weak 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.
0.56 cal
B.
1.8 cal
C.
80. cal
D.
3.6 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.
470 kcal
B.
220 kcal
C.
240 kcal
D.
490 kcal
E.
54 kcal
Question #19
Gold in a ring is a(n)
A.
heterogeneous mixture.
B.
element.
C.
homogeneous mixture.
D.
compound.
E.
none of the above
Question #20
In which of the following would the particles move most rapidly?
A.
boiling water
B.
steam at 110 °C
C.
water at 20 °C
D.
ice at 0 °C
E.
ice at -20 °C
Question #21
Which one of the following properties describes a liquid?
A.
has its own shape
B.
There is essentially no interaction between the particles.
C.
fills the entire volume of the container
D.
particles move very rapidly
E.
particles are close together and move randomly
Question #22
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.
small relative to the size of the molecules.
D.
close relative to the size of the molecules.
E.
fixed relative to the size of the molecules.
Question #23
Coins in a piggy bank are an example of a(n)
A.
heterogeneous mixture.
B.
element.
C.
homogeneous mixture.
D.
compound.
E.
none of the above
Question #24
Which of the following is a physical change?
A.
fermenting grapes to produce wine
B.
digesting a meal
C.
baking a cake
D.
dry ice subliming
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 initial temperature
B.
the final 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.
pouring water into a vacuum-insulated bottle
B.
freezing water
C.
sublimation of dry ice
D.
melting ice
E.
vaporization of alcohol
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.
0.050%
B.
0.020%
C.
2.0%
D.
20%
E.
5.0%
Question #28
An example of kinetic energy is
A.
a tree.
B.
a coiled spring.
C.
running water.
D.
chemical energy.
E.
natural gas.
Question #29
On a heating curve a plateau corresponds to
A.
a change of state.
B.
the solid being broken into smaller pieces.
C.
a change in temperature of a gas.
D.
a change in temperature of a solid.
E.
a change in temperature of a liquid.
Question #30
Which of the following is a heterogeneous mixture?
A.
water
B.
sugar
C.
noodle soup
D.
carbon
E.
tea
Question #31
The physical state(s) present when a substance is melting is (are)
A.
solid + liquid.
B.
liquid.
C.
solid.
D.
liquid + gas.
E.
gas.
Question #32
650. J is the same amount of energy as ________.
A.
2.72 cal
B.
155 cal
C.
1550 cal
D.
2720 cal
E.
650. cal
Question #33
A heating curve illustrates
A.
the chemical changes that occur as the substance is heated.
B.
what a substance looks like as it is heated.
C.
the changes in the temperature and physical state of a substance as it is heated.
D.
what happens to the particles of a substance 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.
grinding coffee beans
B.
digesting a cheeseburger
C.
burning coal
D.
converting water to hydrogen and oxygen
E.
baking a cake
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.
deposition.
C.
boiling.
D.
evaporation.
E.
sublimation.
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.
125 mL
C.
0.0040 mL
D.
250 mL
E.
63 mL
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