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WorksheetsBalancing Chemical Equations
Total questions: 22
Worksheet time: 31mins
Name
Class
Date
1.
The substances at the beginning of a chemical equation are called the ____.
A + B --> AB
A + B --> AB
a)
product
b)
yield
c)
chemical symbol
d)
reactants
2.
In a chemical reaction, everything to the right of the arrow is called _____.
A + B --> AB
A + B --> AB
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
3.
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.
4.
The red numbers in the image represent _____.
a)
subscripts
b)
coefficients
c)
charges
d)
oxidation states
5.
The blue numbers in the image represent ________.
a)
charges
b)
coefficients
c)
subscripts
d)
oxidation states
6.
What does the arrow in a chemical equation stand for?
H2 + O --> H2O
H2 + O --> H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
7.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
8.
Balance this equation.
_CH4 + _O2 --> _CO2 + _H2O
_CH4 + _O2 --> _CO2 + _H2O
a)
1,2,1,1
b)
2,1,2,1
c)
1,2,1,2
d)
0,2,0,2
9.
What type of reaction is this?
3Ca + 2AlCl3 --> 3CaCl2 + 2Al
3Ca + 2AlCl3 --> 3CaCl2 + 2Al
a)
Synthesis
b)
Decomposition
c)
Single displacement
d)
Double displacement
10.
What type of reaction is this?
3KOH + H3PO4 --> K3PO4 + 3H2O
3KOH + H3PO4 --> K3PO4 + 3H2O
a)
Synthesis
b)
Decomposition
c)
Single displacement
d)
Double displacement
11.
What type of reaction is this?
2Pb(NO3)2 --> 2PbO + 4NO2 + O2
2Pb(NO3)2 --> 2PbO + 4NO2 + O2
a)
Synthesis
b)
Decomposition
c)
Single displacement
d)
Decombustion
12.
What type of reaction is this?
C3H6O + 4 O2 -->3 CO2 + 3 H2O
C3H6O + 4 O2 -->3 CO2 + 3 H2O
a)
single replacement
b)
synthesis
c)
combustion
d)
decombustion
13.
Balance this equation: H2 + N2 → NH3
a)
H2 + 4N2 → NH3
b)
H2 + 3N2 → 2NH3
c)
3H2 + N2 → 2NH3
d)
2H2 + 2N2 → 2NH3
14.
_P4+_O2 → _P2O3
a)
3 P4+1 O2 → 2 P2O3
b)
1 P4+1 O2 → 2 P2O3
c)
1 P4+ 3 O2 → 2 P2O3
d)
1 P4+ 2 O2 → 3 P2O3
15.
__Na + __Cl2 --> __NaCl
a)
1,1,2
b)
2,1,2
c)
2,1,1
d)
already balanced
16.
__NaClO3 --> __NaCl + __O2
a)
2,2,2
b)
2,2,3
c)
3,2,2
d)
1,2,3
17.
__Al + __Fe3N2 -->__AlN + __Fe
a)
already balanced
b)
4,2,4,6
c)
2,1,2,3
d)
1,2,1,3
18.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
19.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
20.
Balance this equation...
Sb2S3 + O2 --> Sb + SO2
Sb2S3 + O2 --> Sb + SO2
a)
It is balanced
b)
Sb2S3 + 3O2 --> 2Sb + 3SO2
c)
Sb2S3 + O2 --> 2Sb + SO2
d)
I don't know...Oh well!
21.
____ Na3PO4 + ____ KOH --->____ NaOH + ____ K3PO4
a)
1,2,1,2
b)
1,3,3,1
c)
1,1,1,1
d)
2,6,6,2
22.
____ AgNO3 + ____ Cu ---> ____ Cu(NO3)2 + ____ Ag
a)
4,2,1,2
b)
1,1,1,1
c)
1,2,1,2
d)
2,1,1,2
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