The Mole
Practice Test
1.
What is the percent composition of carbon dioxide CO
2
?
a.
73% C and 27% O
b.
50% C and 50% O
c.
27% C and 73% O
d.
33% C and 66% O
2.
Below is a list of common prefixes used in the SI and metric systems. Included with each is an abbreviation and a definition. Which set contains an error?
a.
centi c 10
-2
b.
deci d 10
-1
c.
mega m 10
6
d.
micro μ 10
-6
3.
What is the SI base unit used to measure the amount of a substance?
a.
kilogram
b.
mole
c.
kelvin
d.
meter
4.
What mass of iron is contained in 62.8 grams of pyrite FeS
2
?
a.
40.3 g
b.
29.2 g
c.
58.5 g
d.
31.7 g
5.
A unit that is defined by a combination of base units is a(n) ________________.
a.
derived unit
b.
metric unit
c.
SI unit
d.
English unit
6.
How many atoms of carbon are in a pure sample of carbon having a mass of 72.0 g?
Element
Molar Mass (g/mol)
Hydrogen
1.01
Carbon
12.01
Chlorine
35.45
a.
3.6 x 10
23
b.
36 x 10
24
c.
3.6 x 10
24
d.
4.33 x 10
25
7.
What is the correct word equation for the chemical equation 2Fe(s) + 3Cl
2
(g) → 2FeCl
3
(s)?
a.
Solid iron and chlorine gas react to produce solid iron chloride.
b.
Aqueous iron and chlorine gas react to produce aqueous iron chlorate.
c.
Solid iron and chlorine gas react to produce solid iron chlorate.
d.
Aqueous iron and chlorine gas react to produce solid iron chlorate.
8.
The components of a chemical equation that are left after the spectator ions are removed are the ____________.
a.
products
b.
participating ions
c.
reactants
d.
spectator ions
9.
How many milliliters are there in 1.0 microliter?
a.
1.0 x 10
-2
mL
b.
1.0 x 10
-1
mL
c.
1.0 x 10
-4
mL
d.
1.0 x 10
-3
mL
10.
Calculate the number of moles of hydrogen atoms in 4.75 mol sulfuric acid.
a.
9.50 mol
b.
4.75 mol
c.
33.2 mol
d.
2.38 mol
11.
Which word indicates that two water molecules are associated with a substance in a chemical compound?
a.
di
-
b.
mono
-
c.
tri
-
d.
an
-
12.
What is the correct chemical formula for barium hydroxide octahydrate?
Prefix
Molecules H
2
O
Mono-
1
Di-
2
Tri-
3
Tetra-
4
Penta-
5
Hexa-
6
Hepta-
7
Octa-
8
Deca-
10
a.
Ba(OH)
2
. H
2
O
b.
Ba(OH)
2
. 8H
2
O
c.
Ba . 8(OH)
2
d.
8Ba(OH)
2
. H
2
O
13.
How many molecules of ammonia are present in 34.0 g of ammonia NH(
3
)?
a.
1.77 x 10
22
b.
1.20 x 10
24
c.
34
d.
6.02 x 10
23
14.
Determine the number of atoms in 3.54 mol S.
a.
1.70 x 10
23
b.
2.13 x 10
23
c.
1.70 x 10
24
d.
2.13 x 10
24
15.
What is the area in square millimeters of a rectangle that is 7.431 cm long and 23.33 mm wide?
a.
173.4 mm
2
b.
1734 mm
2
c.
1.734 mm
2
d.
17.34 mm
2
16.
Which of the following components will always be produced during a chemical reaction between an acid and a base?
a.
water
b.
an acid
c.
a base
d.
a gas
17.
The major physical indicator of a combustion reaction is _______.
a.
cold
b.
the formation of a precipitate
c.
heat
d.
a color change in solution
18.
A balanced chemical equation is a direct presentation of the ___________.
a.
law of conservation of momentum
b.
law of conservation of mass
c.
law of conservation of energy
d.
ideal gas law
19.
The following chemical equation is classified as a ______________.
CaCO
3
→ CaO + CO
2
a.
single-replacement reaction
b.
synthesis reaction
c.
decomposition reaction
d.
double-replacement reaction
