WorksheetsBalancing Chemical Equations
Total questions: 15
Worksheet time: 24mins
Name
Class
Date
1.
How many Oxygens are in this molecule?
(OH)2
(OH)2
a)
4
b)
1
c)
2
d)
3
2.
What are the smaller numbers that you CANNOT change in a chemical equation?
a)
Coefficient
b)
Products
c)
Reactants
d)
Subscript
3.
What are the larger numbers that you CAN CHANGE in a chemical equation?
a)
Coefficient
b)
Products
c)
Reactants
d)
Subscripts
4.
What law governs the balancing of chemical equations?
a)
Law of Energy
b)
Law of Conservation of Matter/Mass
c)
Law of Gravity
d)
Law of Matter Movement
5.
What is the Law of Conservation of Mass?
a)
It states that no matter can be created or destroyed.
b)
It states that no energy can be created or destroyed.
c)
It states that matter can be created or destroyed.
d)
It states that no sound can be created or destroyed.
6.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number in front of a chemical formula.
c)
The number in between the chemical symbols.
d)
The number behind a chemical formula.
7.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
8.
How many HCl molecules do you need to balance this equation?
Mg + __HCl ---> MgCl2 + H2
Mg + __HCl ---> MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
9.
Is this balanced?
Al + O2 → 2Al2O3
Al + O2 → 2Al2O3
a)
Yes
b)
No
10.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
11.
CaCO3 represents a chemical
a)
Symbol
b)
Formula
c)
Subscript
d)
Reaction
12.
The substances listed on the left side of a chemical equation are the
a)
Products
b)
Coefficients
c)
Precipitates
d)
Reactants
13.
In balancing chemical equations, we change
a)
Coefficients
b)
Subscripts
c)
Both can be changed
d)
None can be changed
14.
Which number should go in the blank?
Al(NO3)3 + _ NaOH -> Al(OH)3 + 3 NaNO3
Al(NO3)3 + _ NaOH -> Al(OH)3 + 3 NaNO3
a)
1
b)
2
c)
3
d)
0
15.
If 100 grams of vinegar and 5 grams of baking soda are poured in a container, a small amount of gas will be produced. What will the final mass of the products be if the gas is trapped in the container?
a)
100 g
b)
104 g
c)
105 g
d)
110 g
100 %
