Matter—Properties and Changes
Practice Test
1.
A vapor is a _________.
a.
solid
b.
liquid
c.
gas
d.
condensed state
2.
How can the law of conservation of mass apply to a burning log, if all that remains of it is ash?
a.
The law of conservation of mass applies to substitution and displacement reactions, but not to combustion reactions.
b.
The masses of the gases and water vapor released into the air by the combustion reaction plus the mass of ash equal the mass of the log before burning.
c.
The ash has the same mass as the log, although a large percentage of it blows away.
d.
The law of conservation of mass applies to changes of state but not to chemical reactions.
3.
A material that cannot be broken down further by chemical means is a(n) ________.
a.
compound
b.
element
c.
substance
d.
mixture
4.
Two items that must be worn during any laboratory experiment are ___________.
a.
safety goggles and fire-proof mitts
b.
gloves and a lab apron
c.
safety goggles and a lab apron
d.
rubber gloves and a face shield
5.
A solution of solids is a(n)___________.
a.
alloy
b.
filtration
c.
pure metal
d.
heterogeneous mixture
6.
How is the slope of a linear graph calculated?
a.
slope = (x
2
– x
1
) / (y
2
– y
1
)
b.
slope = (y
2
– y
1
) x 100
c.
slope = (y
2
– y
1
) / (x
2
– x
1
)
d.
slope = (x
2
– x
1
) / 100
7.
What is the name given to a set of controlled observations that test a proposed explanation?
a.
hypothesis
b.
experiment
c.
conclusion
d.
theory
8.
How many milliliters are there in 1.0 microliter?
a.
1.0 x 10
-3
mL
b.
1.0 x 10
-2
mL
c.
1.0 x 10
-1
mL
d.
1.0 x 10
-4
mL
9.
A characteristic that can be observed or measured without changing the sample’s composition is ________________.
a.
a gaseous property
b.
a crystalline property
c.
a chemical property
d.
a physical property
10.
Dimensional analysis is a method of problem-solving that focuses on ________ .
a.
error
b.
units
c.
accuracy
d.
precision
11.
The representation of data on graph that resembles a pizza is a _________.
a.
bar graph
b.
line graph
c.
circle graph
d.
inverse
12.
A judgment based upon the results of an experiment is a _____________.
a.
theory
b.
hypothesis
c.
variable
d.
conclusion
13.
Which of the following is not a significant figure?
a.
zeros to the left of the first significant digit
b.
a value of 1 through 9
c.
a zero between two digits that have values of 1 through 9
d.
zeros to the right of a significant digit when a decimal point is present
14.
In the following chemical reaction, how do you classify hydrogen and oxygen?
2H
2
+ O
2
→ 2H
2
O
a.
products
b.
chemical properties
c.
reactants
d.
physical changes
15.
How many significant figures will there be when the density value is calculated from the following data? mass = 24.47g; volume =13.2 mL
a.
2
b.
5
c.
4
d.
3
16.
Elements on the left side of the periodic table are _______.
a.
nonmetals
b.
metals
c.
metalloids
d.
compounds
17.
When a laboratory session ends, you must always ___________.
a.
eat or drink in the laboratory
b.
wash your hands
c.
wash your eyes in the eye-wash fountain
d.
take a shower in the chemical hazard shower
18.
A sample of gold has a mass of 15.7 g and displaces 0.81 cm
3
of water in a graduated cylinder. What is the density of gold?
a.
19.3 g/cm
3
b.
14.9 g/cm
3
c.
.05 g/cm
3
d.
0.81 g/cm
3
19.
Which of the following methods of separating mixtures is best if the solution cannot be saturated and is temperature-sensitive?
a.
chromatography
b.
crystallization
c.
distillation
d.
combustion
20.
What volume is occupied by 16.4 g of mercury? The density of mercury is 13.6 g/mL.
a.
0.829 mL
b.
30.0 mL
c.
223 mL
d.
1.21 mL
