Chemical Reactions and Equations
Practice Test
1.
A mystery compound dissolves in water to produce a solution that does not conduct electricity. The compound cannot be __________.
a.
sodium chloride
b.
benzene
c.
butane
d.
ethanol
2.
This scientist arranged some elements in triads based on their atomic masses and other properties.
a.
Dobereiner
b.
Newlands
c.
Mendeleev
d.
Einstein
3.
In natural waste-disposal processes, atoms are ___________.
a.
destroyed
b.
created
c.
made into aluminum
d.
recycled
4.
In a ______________ reaction, two or more substances react to form a single product.
a.
decomposition
b.
double displacement
c.
synthesis
d.
gas-producing
5.
What is the coefficient for NaOH in the equation that describes its reaction with CO
2
to produce Na
2
CO
3
and H
2
O?
a.
4
b.
2
c.
1
d.
3
6.
Calcium atoms tend to react to form _______ ions.
a.
1+
b.
6-
c.
4-
d.
2+
7.
When hydrogen and oxygen react to form water, ______________.
a.
energy is absorbed
b.
energy is released
c.
the reaction is endothermic
d.
the mass increases
8.
What type of reaction occurs when potassium and chlorine gas produce potassium chloride?
a.
synthesis
b.
replacement
c.
combustion
d.
decomposition
9.
In a conductor such as silver, valence electrons are free to move to produce _____________.
a.
electrical potential
b.
copper atoms
c.
nuclei
d.
an electric current
10.
A substance that increases the rate of a chemical reaction without being permanently changed or consumed is called ______________.
a.
an equilibrate
b.
a product
c.
a reactant
d.
a catalyst
11.
What is the formula for lithium carbonate?
a.
LiCO
b.
Li
3
CO
2
c.
LiCO
3
d.
Li
2
CO
3
12.
Changes in energy, color, and odor are indications that a _____________ has taken place.
a.
precipitation reaction
b.
chemical reaction
c.
displacement reaction
d.
separation reaction
13.
Which of the following is a chemical property of iron?
a.
It rusts.
b.
It conducts electricity.
c.
It is a solid at room temperature.
d.
Its density is 7.87 g/mL.
14.
These elements have six electrons in their outermost energy levels.
a.
Cr, Mo, and W
b.
He, Ne, and Ar
c.
O, S, and Se
d.
Cr, Mn, and Fe
15.
What element makes up approximately 65% of your body by mass?
a.
calcium
b.
oxygen
c.
hydrogen
d.
nitrogen
16.
This compound is commonly found in all three states of matter on Earth's surface.
a.
iron oxide
b.
carbon dioxide
c.
water
d.
sodium chloride
17.
The two routes for nitrogen fixation in nature are __________.
a.
bacteria and the water cycle
b.
lightning and ultraviolet radiation
c.
lightning and ozone formation
d.
bacteria and lightning
18.
Which pair of elements would you expect to have similar properties?
a.
Li and Fe
b.
F and Ne
c.
Mg and Ti
d.
Si and Ge
19.
Molten sodium chloride conducts electricity because ______________________.
a.
the chlorine atoms carry a charge
b.
the ions are free to move
c.
chlorine gas escapes
d.
solid sodium conducts, too
20.
Adding reactants causes an equilbrium to ______________.
a.
shift to the left
b.
shift to the right
c.
shift in both directions simultaneously
d.
remain unchanged
