Chemistry: The Science of Matter
Practice Test
1.
Crushing a substance ____________.
a.
is a chemical change
b.
increases its density
c.
is a physical change
d.
decreases its melting point
2.
This substance decomposes to produce carbon, hydrogen, and oxygen. It may be ______________.
a.
sucrose
b.
table salt
c.
bronze
d.
ammonia
3.
An exothermic reaction is one that _______________.
a.
produces a solid
b.
causes a color change
c.
gives off energy
d.
absorbs energy
4.
What element makes up approximately 65% of your body by mass?
a.
hydrogen
b.
oxygen
c.
calcium
d.
nitrogen
5.
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.
0.81 g/cm3
b.
19.3 g/cm3
c.
14.9 g/cm3
d.
.05 g/cm3
6.
Which of the following is a chemical property of iron?
a.
Its density is 7.87 g/mL.
b.
It conducts electricity.
c.
It rusts.
d.
It is a solid at room temperature.
7.
The density of cork is _______________.
a.
11.34 1.00 g/mL
b.
less than 1.00 g/mL
c.
more than 1.00 g/mL
d.
1.00 g/mL
8.
The color of a substance is called a __________.
a.
chemical change
b.
physical property
c.
chemical property
d.
physical change
9.
An object has a mass of 20.0 g and a volume of 10.0 mL. What is its density?
a.
2.00 g/mL
b.
20.0 g
c.
10.0 mL
d.
0.500 g/mL
10.
Photosynthesis is _______________.
a.
a physical change
b.
exothermic
c.
endothermic
d.
a substance
