WorksheetsBalancing Equations
Total questions: 24
Worksheet time: 19mins
Name
Class
Date
1.
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
2.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
3.
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
4.
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.
5.
N2 + H2 = NH4
a)
Balanced
b)
Unbalanced
6.
Fill in the blanks with coefficient:
PCl5+_ H2O→_ HCl+H3PO4
PCl5+_ H2O→_ HCl+H3PO4
a)
4, 5
b)
1, 6
c)
3, 8
d)
2,2
7.
Which side of a chemical equation is the product side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
8.
Which problem is balanced?
a)
PbO2 + 2H2--> H2SO4
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
d)
2Na + 2H2O --> 2NaOH + H
9.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
10.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
11.
The blue numbers in the image below represent ________
a)
Charges
b)
coefficients
c)
subscripts
d)
none of the answers are correct
12.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
6
c)
8
d)
24
13.
Balance this equation:
P4+O2 --> P2O3
P4+O2 --> P2O3
a)
3 P4+ O2 --> 2 P2O3
b)
P4+ O2 --> 2 P2O3
c)
P4+ 3 O2 --> 2 P2O3
d)
P4+ 2 O2 --> 3 P2O3
14.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
15.
Balance this equation,
Al2O3 --> Al + O2
Al2O3 --> Al + O2
a)
Cannot be balanced
b)
2Al2O3 --> 2Al+3O2
c)
2Al2O3--> 4Al+3O2
d)
3Al2O3--> 2Al+O2
16.
Balance the equation:
Si(OH)4+NaBr--> SiBr4+NaOH
Si(OH)4+NaBr--> SiBr4+NaOH
a)
Si(OH)4+2NaBr--> SiBr4+NaOH
b)
Si(OH)4+4NaBr--> SiBr4+4NaOH
c)
Si(OH)4+NaBr--> SiBr4+4NaOH
d)
Si(OH)4+2NaBr--> SiBr4+2NaOH
17.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
d)
Left side is balanced
18.
Finish a blalanced equation:
Mg(OH)2 --> __________
Mg(OH)2 --> __________
a)
Mg(OH)2 --> MgOH
b)
Mg(OH)2 --> MgO+ H2O
c)
Mg(OH)2 --> MgO+ H2
d)
Mg(OH)2 --> Mg+ H2O
19.
Which elements are(is) not balanced?
LiNO3 +CaBr2 --> Ca(NO3)2 + LiBr
LiNO3 +CaBr2 --> Ca(NO3)2 + LiBr
a)
Li
b)
Ca and Li
c)
O and N
d)
Ca
20.
Which of the following has the most number of O?
a)
2Mg3(PO4)2
b)
4AlPO4
c)
3Al(NO3)3
d)
15KOH
21.
___ SnO₂ + ___ H₂ → ___ Sn + ___ H₂O
a)
SnO₂ + 2 H₂ → Sn + 2 H₂O
b)
2 H₂ → Sn + 2 H₂O
c)
SnO₂ + H₂ → Sn + 2 H₂O 2
d)
SnO₂ + H₂ → 2Sn + H₂O
22.
2P + 3Br2 → 2PBr3
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
23.
Zn + 2HCl → ZnCl2 + H2
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
24.
2KOH + CuSO4 → K2SO4 + Cu(OH)2
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
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