NEW
Font size
S
M
L
XL
WorksheetsBalancing Chemical Equations Test
Total questions: 20
Worksheet time: 40mins
Name
Class
Date
1.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
2.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
3.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
4.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
5.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
6.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
7.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
8.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction.
9.
Which of the following is an unbalanced equation?
a)
CaCO3 --> CaO + CO2
b)
PbO2 + 2H2-->2Pb + H2O
c)
2Na+ 2H2O-->2NaOH + H2
d)
CS2 + 2O2 --> CO2 + 2SO2
10.
When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced
a)
charge
b)
subscript
c)
random number
d)
coefficient
11.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
12.
A sealed test tube containing 8 grams of iron filings and 5 grams of sulfur is heated until the material in the test tube glows bright red. What is the mass of products?
a)
Mass is less than 13 grams
b)
Mass is equal to 13 grams
c)
Mass is greater than 13 grams
d)
Mass cannot be measured
13.
Can matter be created or destroyed?
a)
Yes, it can be created.
b)
Yes, it can be destroyed.
c)
No, matter is always conserved
d)
None of these
14.
If four hydrogen atoms react with two hydrogen atoms, how many atoms will be in the product?
a)
6
b)
4
c)
8
d)
2
15.
Balance this equation:
HgO ---> 2Hg + O2
a)
It is balanced.
b)
2HgO ---> 2Hg + O2
c)
2HgO ---> Hg + O2
d)
HgO ---> Hg + 2O2
16.
Balanced this equation:
Sb2S3 + O2 ---> Sb + SO2
a)
It is balanced.
b)
Sb2S3 + O2 ---> 2Sb + SO2
c)
Sb2S3 + 3O2 ---> 2Sb + 3SO2
d)
3Sb2S3 + 3O2 ---> 2Sb + SO2
17.
Balance the following equation:
___ H2+ ___ O2→___ H2O
a)
1, 1, 3
b)
2, 2, 2
c)
1, 2, 1
d)
2,1, 2
18.
Balance the following equation:
___ SeCl6+ ___ O2→___ SeO2+____Cl2
a)
1, 1, 1, 3
b)
2, 1, 2, 1
c)
1, 2, 1, 2
d)
2, 2, 2, 4
19.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
20.
Balance this equation
_N2 + _H2 --> _NH3
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
Reset
