Section 1.2
Properties and Changes of Matter
Practice Test
1.
Which of the following is a chemical property of iron?
a.
It conducts electricity.
b.
Its density is 7.87 g/mL.
c.
It is a solid at room temperature.
d.
It rusts.
Hint
2.
An exothermic reaction is one that _______________.
a.
absorbs energy
b.
causes a color change
c.
gives off energy
d.
produces a solid
Hint
3.
This substance decomposes to produce carbon, hydrogen, and oxygen. It may be ______________.
a.
ammonia
b.
bronze
c.
sucrose
d.
table salt
Hint
4.
A volatile substance is one that ____________________ at room temperature.
a.
changes to a gas easily
b.
condenses
c.
decomposes readily
d.
freezes readily
Hint
5.
When water decomposes into hydrogen and oxygen, the mass _____________.
a.
decreases
b.
decreases if the temperature exceeds 100oC.
c.
increases
d.
remains constant
Hint
6.
An object has a mass of 20.0 g and a volume of 10.0 mL. What is its density?
a.
0.500 g/mL
b.
2.00 g/mL
c.
10.0 mL
d.
20.0 g
Hint
7.
The density of cork is _______________.
a.
less than 1.00 g/mL
b.
1.00 g/mL
c.
more than 1.00 g/mL
d.
11.34 1.00 g/mL
Hint
8.
The color of a substance is called a __________.
a.
chemical change
b.
chemical property
c.
physical change
d.
physical property
Hint
9.
What element makes up approximately 65% of your body by mass?
a.
calcium
b.
hydrogen
c.
nitrogen
d.
oxygen
Hint
10.
The capacity to do work is called ________.
a.
energy
b.
mass
c.
volume
d.
density
Hint
11.
Photosynthesis is _______________.
a.
endothermic
b.
exothermic
c.
a physical change
d.
a substance
Hint
12.
Crushing a substance ____________.
a.
is a chemical change
b.
is a physical change
c.
decreases its melting point
d.
increases its density
Hint
13.
When water reacts with baking powder, _______ gas is produced.
a.
ammonia
b.
carbon dioxide
c.
helium
d.
nitrogen
Hint
14.
A sample of gold has a mass of 15.7 g and displaces 0.81 cm3 of water in a graduated cylinder. What is the density of gold?
a.
.05 g/cm3
b.
0.81 g/cm3
c.
14.9 g/cm3
d.
19.3 g/cm3
Hint
15.
How can the law of conservation of mass apply to a burning log, if all that remains of it is ash?
a.
The ash has the same mass as the log, although a large percentage of it blows away.
b.
The law of conservation of mass applies to changes of state but not to chemical reactions.
c.
The law of conservation of mass applies to substitution and displacement reactions, but not to combustion reactions.
d.
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.
Hint
