Section 6.1
Chemical Equations
Practice Test
1.
Changes in energy, color, and odor are indications that a _____________ has taken place.
a.
chemical reaction
b.
displacement reaction
c.
precipitation reaction
d.
separation reaction
Hint
2.
A description of a chemical reaction that includes the names of all reactants and products, but not the formulas, is called a ___________________.
a.
balanced equation
b.
chemical equation
c.
skeleton equation
d.
word equation
Hint
3.
The substances to the left of the reaction arrow are called _______________.
a.
gases
b.
precipitates
c.
products
d.
reactants
Hint
4.
The substances to the right of the reaction arrow are called _______________.
a.
products
b.
reactants
c.
gases
d.
precipitates
Hint
5.
A solid that forms from a solution during a chemical reaction is called a ______________.
a.
precipitate
b.
substrate
c.
reactant
d.
formate
Hint
6.
What is the missing product in this balanced equation describing the decomposition of water? 2H
2
O(l) + energy
O
2
(g) +
a.
2H
2
(g)
b.
H
2
O(g)
c.
H
2
(g)
d.
energy
Hint
7.
This type of chemical reaction has energy written as a product.
a.
endothermic
b.
energy-absorbing
c.
exothermic
d.
light-absorbing
Hint
8.
A number placed before a formula to indicate how many units of the substance are involved in a chemical reaction is called a ____________.
a.
coefficient
b.
substrate
c.
subscript
d.
superscript
Hint
9.
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.
1
b.
2
c.
3
d.
4
Hint
10.
A reaction between magnesium chloride and silver nitrate yields magnesium nitrate and silver chloride. What is the coefficient for magnesium nitrate in the balanced equation for the reaction?
a.
1
b.
2
c.
3
d.
4
Hint
