Matter—Properties and Changes
Practice Test
1.
Which of the following is not a chemical change?
a.
freezing of water
b.
rusting of iron
c.
burning a piece of wood
d.
placing iron in hydrochloric acid and producing hydrogen gas
2.
Properties that are dependent on the amount of substance present are ________.
a.
intensive properties
b.
extensive properties
c.
external properties
d.
chemical properties
3.
A technique that uses the differences in boiling point to separate homogeneous mixtures is _________.
a.
crystallization
b.
filtration
c.
distillation
d.
chromatography
4.
Fe
2
O
3
is a(n) _____________.
a.
homogeneous mixture
b.
compound
c.
heterogeneous mixture
d.
element
5.
How would you read the following chemical reaction?
2Cu + O
2
→ 2CuO
a.
copper yields oxygen and copper(II) oxide
b.
copper(II) oxide yields oxygen and copper
c.
oxygen yields copper and copper(II) oxide
d.
copper and oxygen yield copper(II) oxide
6.
Sucrose is composed of carbon, hydrogen, and oxygen. Which of the following data is not needed in order to determine the percent by mass of the three elements?
Analysis Data of Two Copper Compounds
Compound
% Cu
% Cl
Mass copper (g)100.0 g
of compound
Mass chlorine (g) 100.0 g
of compound
Mass ratio
mass Cu
————
mass Cl
I
64.20
35.80
64.20
35.80
1.793 g Cu/1 g Cl
II
47.27
52.73
47.27
52.73
0.8964 g Cu/1 g Cl
a.
atomic numbers of the elements
b.
total mass of the sucrose sample
c.
mass of hydrogen in sucrose sample
d.
mass of carbon in sucrose sample
7.
A material that cannot be broken down further by chemical means is a(n) ________.
a.
element
b.
mixture
c.
compound
d.
substance
8.
Periods are ___________ on the periodic table.
a.
right to left diagonals
b.
left to right diagonals
c.
horizontal rows
d.
vertical columns
9.
The statement, "Mass can neither be created nor destroyed" is the ____________.
a.
law of conservation of mass
b.
law of conservation of energy
c.
law of multiple proportions
d.
law of gravity
10.
A heterogeneous mixture is poured through a piece of filter paper that is positioned over a beaker. What is the substance that is collected in the beaker?
a.
heterogeneous mixture
b.
Not enough information is given.
c.
solid
d.
solution
11.
How can you tell when the following reaction is balanced?
2Cu + O
2
→ 2CuO
a.
volume of reactants = mass of products
b.
mass of reactants = volume of products
c.
volume of reactants = volume of products
d.
mass of the reactants = mass of products
12.
In the following chemical reaction, how do you classify hydrogen and oxygen?
2H
2
+ O
2
→ 2H
2
O
a.
reactants
b.
products
c.
chemical properties
d.
physical changes
13.
What type of property is observed when milk sours?
a.
an intensive property
b.
an extensive property
c.
a physical property
d.
a chemical property
14.
Matter that has a uniform and unchanging composition is a ___________.
a.
vapor
b.
mixture
c.
substance
d.
solid
15.
A solution of solids is a(n)___________.
a.
heterogeneous mixture
b.
alloy
c.
filtration
d.
pure metal
16.
When one substance changes identity, it exhibits a(n) __________.
a.
physical property
b.
chemical property
c.
intensive property
d.
extensive property
17.
Elements on the left side of the periodic table are _______.
a.
nonmetals
b.
metalloids
c.
compounds
d.
metals
18.
Which of the following is a heterogeneous mixture?
a.
sugar
b.
samples of nitrogen and oxygen in the same container
c.
samples of argon and iron in the same container
d.
sugar in water
19.
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 changes of state but not to chemical reactions.
b.
The law of conservation of mass applies to substitution and displacement reactions, but not to combustion reactions.
c.
The ash has the same mass as the log, although a large percentage of it blows away.
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.
20.
Which of the following methods of separating mixtures is best if the solution cannot be saturated and is temperature-sensitive?
a.
distillation
b.
crystallization
c.
chromatography
d.
combustion
