167/ACCBD Version Quiz 1 Measurement lyon (51900)
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001 (part 1 of 2) 10.0 points
What does the term intensive property of a
substance mean?
1. A chemical property of a substance that
is independent of the amount of material examined.
2. A chemical property of a substance that
is dependent upon the amount of material
examined.
3. A physical property of a substance that
is dependent upon the amount of material
examined.
4. A physical property of a substance that is
independent of the amount of material examined. correct
Explanation:
002 (part 2 of 2) 10.0 points
Which of the following pairs are both intensive
properties of a substance?
1. temperature and volume
2. density and mass
3. mass and volume
4. density and temperature correct
Explanation:
003 10.0 points
The major importance of signicant gures is
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1. to assist in conversion to metric units.
2. All of these answers are correct.
3. to show the degree of uncertainty or precision in measurements. correct
4. to make it easier to round o numbers.
5. to provide a logical strategy for dimensional analysis.
Explanation:
The major importance of signicant gures
is to show the degree of uncertainty or precision in measurements.
004 10.0 points
Keeping in mind the rules for signicant g6.28126 106 m3
.
ures, divide
7.66 103 m
1. 82.0 108 m2
2. 8.20 108 m2 correct
3. 0.820 105 m2
4. 0.820 104 m2
5. 8.20 106 m2
6. 82.0 109 m2
Explanation:
quotient of given values = ?
6.28126 106 m3
= 8.20 108 m2
3 m
7.66 10
005 10.0 points
A chemist determined in a set of experiments
that the density of magnesium metal was 1.68
g/cm3 , 1.67 g/cm3 , 1.69 g/cm3 , and 1.69
g/cm3 . The accepted value for its density
is 1.89 g/cm3 . You would conclude that the
chemists data is
1. qualitative, but not quantative.
Version 167/ACCBD Quiz 1 Measurement lyon (51900)
2
1. graduated cylinder
2. precise and accurate.
2. buret
3. precise, but not accurate. correct
3. beaker correct
4. neither precise nor accurate.
4. pipet
5. accurate, but not precise.
Explanation:
The data is precise because the numbers
resemble each other closely, however the data
is not accurate because it is not close to the
actual value.
006 10.0 points
When one changes substance into one or more
new substances, it has exhibited a
Explanation:
A beaker is the least precise device to measure liquid volumes.
009 10.0 points
All of the following are characteristic properties of oxygen. Which one is a chemical
property?
1. Elemental oxygen exists as a diatomic gas
at room temperature.
1. physical change.
2. chemical property.
3. chemical change. correct
4. chemical reaction.
Explanation:
Denition
007 10.0 points
What is the density of a wood block that has
a mass of 97.5 g and measures 12 cm 3.33
cm 4.2 cm? (Use signicant digits.)
2. Oxygen makes up about 20% of our atmosphere.
3. Oxygen boils at 183 C.
4. Oxygen can combine with metals. correct
Explanation:
Chemical properties are exhibited as matter undergoes a chemical changes. A chemical
property of the metal is that it can combine
with oxygen, releasing energy in the process.
A chemical property of oxygen is that it can
combine with the metal.
1. 0.581 g/cm3
2. 0.58 g/cm3 correct
3. 1.723538 g/cm3
4. 1.72 g/cm3
5. 0.5809381 g/cm3
Explanation:
008 10.0 points
Which is the LEAST precise of these devices
for measuring liquid volumes?
010 10.0 points
Assume that the volume and pressure are constant and the same for both measurements.
Also assume both measurements are accurate.
If the density of a substance is measured
twice at dierent temperatures, the density of
the substance may change.
1. True correct
2. False
Explanation:
At constant temperature and pressure, the
density of a substance remains constant. Den-
Version 167/ACCBD Quiz 1 Measurement lyon (51900)
sity is an intensive property, which is independent of the amount of matter. E.g. Regardless
of the volume or the mass of two dierent samples of pure water, the density is the same for
both samples if the temperature is the same
for both samples.
However, density is a function of temperature because volume varies with temperature,
whereas the mass remains constant. Therefore, the density of the substance may be different if the density of the samples is measured
at dierent temperatures. Small variations in
temperature do not usually change the density to any signicant degree if the substance
is a solid or non volatile liquid. Since we do
not know the state (or kind) of the substance
or the magnitude of the temperature dierence, we must assume that the densities may
be dierent after the two measurements.
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