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Chapter 2 Exam

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
Which of the following observations is qualitative?
a.
A chemical reaction was complete in 2.3 seconds.
b.
The solid had a mass of 23.4 grams.
c.
The pH of a liquid was 5.
d.
Salt crystals formed as the liquid evaporated.
 

 2. 
A statement that can be tested experimentally is a
a.
variable.
c.
generalization.
b.
model.
d.
hypothesis.
 

 3. 
Standards of measurement are chosen because they
a.
can be related to everyday objects.
b.
are reproducible in another laboratory.
c.
cannot be destroyed by any common physical or chemical means.
d.
are easily changed.
 

 4. 
Which of these statements does not describe a measurement standard?
a.
Measurement standards avoid ambiguity.
b.
Measurement standards must be unchanging.
c.
A standard can be easily changed to suit the experiment.
d.
Confusion is eliminated when the correct measurement is applied.
 

 5. 
Which of these is not an SI base unit?
a.
kilogram
c.
liter
b.
second
d.
Kelvin
 

 6. 
The metric unit for length that is closest to the diameter of a pencil is the
a.
micrometer.
c.
centimeter.
b.
millimeter.
d.
decimeter.
 

 7. 
The symbol mm represents
a.
micrometer.
c.
milliliter.
b.
millimeter.
d.
meter.
 

 8. 
Which of these metric units is used to measure mass?
a.
m
c.
g
b.
mm
d.
L
 

 9. 
The liter is defined as
a.
1000 m3.
c.
1000 g3.
b.
1000 cm3.
d.
1000 c3.
 

 10. 
The standard base unit for mass is the
a.
gram.
c.
meter.
b.
cubic centimeter.
d.
kilogram.
 

 11. 
A volume of 1 milliliter is equivalent to
a.
1 cubic centimeter.
c.
1 liter.
b.
1 gram.
d.
10–1 cubic decimeters.
 

 12. 
Which of these is a measure of the amount of material?
a.
density
c.
volume
b.
weight
d.
mass
 

 13. 
The density of aluminum is 2.70 g/cm3. What is the mass of a solid piece of aluminum with a volume of 1.50 cm3?
a.
0.556 g
c.
4.05 g
b.
1.80 g
d.
4.20 g
 

 14. 
How many minutes are in 1 week?
a.
168 min
c.
10 080 min
b.
1440 min
d.
100 800 min
 

 15. 
The measurement 0.035550 g rounded off to two significant figures would be
a.
0.03 g.
c.
0.036 g.
b.
0.35 g.
d.
3.5 ´ 102 g.
 

 16. 
When adding numbers, the sum should be rounded so that the final digit is in the same place as the
a.
rightmost digit of the numbers added.
b.
last digit in the longest number added.
c.
leftmost digit of the numbers added.
d.
leftmost digit of the shortest number added.
 

 17. 
Which of these measurements has been expressed to four significant figures?
a.
0.0020 mm
c.
30.00 mm
b.
0.0402 mm
d.
402.10 mm
 

 18. 
Using a metric ruler with 1 mm divisions, the sides of a rectangular piece of plywood were measured as 3.54 cm and 4.85 cm, which corresponds to an area of 17.1690 cm2. Which of these shows the area expressed correctly?
a.
17.1 cm2.
c.
17.17 cm2.
b.
17.169 cm2.
d.
17.2 cm2.
 

 19. 
Three samples of 1.12 g, 1.8 g, and 1.562 g are mixed together. The combined mass of the three samples, expressed to the correct number of significant figures, would be recorded as
a.
4.4 g.
c.
4.482 g.
b.
4.48 g.
d.
4.5 g.
 

 20. 
The product of 13 cm and 5.7 cm is correctly reported as
a.
74 cm2.
c.
74.1 cm2.
b.
74.0 cm2.
d.
75 cm2.
 

 21. 
How many significant figures would the answer to the following calculation have?

3.475 ´ 1.97 + 2.4712 is
a.
2
c.
4
b.
3
d.
5
 

 22. 
When 1.92 ´ 10–6 kg is divided by 6.8 ´ 102 mL, the quotient equals
a.
2.8 ´ 10–4 kg/mL.
c.
2.8 ´ 10–8 kg/mL.
b.
2.8 ´ 10–5 kg/mL.
d.
2.8 ´ 10–9 kg/mL.
 

 23. 
When 6.02 ´ 1023 is multiplied by 9.1 ´ 10–31, the product is
a.
4.3 ´ 10–8.
c.
4.3 ´ 10–7.
b.
4.3 ´ 1054.
d.
4.3 ´ 10–53.
 

 24. 
If values for x and y vary as an inverse proportion,
a.
their quotient is a constant.
c.
their product is a constant.
b.
their graph is a parabola.
d.
their graph is a straight line.
 

 25. 
Two variables are inversely proportional if their ____ has a constant value.
a.
sum
c.
product
b.
difference
d.
quotient
 



 
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