WorksheetsChemical Equations Balanced or Unbalanced
Total questions: 20
Worksheet time: 20mins
Name
Class
Date
1.
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
2.
Balance this equation-
__P4 + __O2 --> __P2O3
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
3.
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
4.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__AgNO3 + __H2S --> __Ag2S+ __HNO3
a)
2,1 --> 1,2
b)
1,2 --> 1,1
c)
1,2 --> 1,2
d)
1,2 --> 2,1
5.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__FeCl3 + __Ca(OH)2 --> __Fe(OH)3 + __CaCl2
a)
4,3--> 2,1
b)
3,2 --> 3,1
c)
2,3 --> 2,2
d)
2,3 --> 2,3
6.
What is the sum of the coefficients when the following equation is correctly balanced?
___ As2O5 + ___ H2O → ___ H3AsO4
a)
5
b)
6
c)
10
d)
12
7.
CO + ___H2 --> CH4 + H2O
a)
1
b)
2
c)
3
d)
4
8.
2NaCl + CaO --> ___Na2O + CaCl2
a)
1
b)
2
c)
3
d)
4
9.
4Ag + O2 --> ___Ag2O
a)
1
b)
2
c)
3
d)
4
10.
3Pb(NO3)2 + 2Na3PO4 --> ___Pb3(PO4)2 + 6NaNO3
a)
1
b)
2
c)
3
d)
4
11.
2H2 + O2 --> ___H2O
a)
1
b)
2
c)
3
d)
4
12.
2NH3 + 3CuO --> N2 + ___Cu + 3H2O
a)
1
b)
2
c)
3
d)
4
13.
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.
14.
What is the part of the chemical equation in green called?
Fe + S --> FeS
Fe + S --> FeS
a)
products
b)
reactants
c)
yield
d)
chemical formula
15.
What is the little number after an element in a chemical equation called.
Example: H2
Example: H2
a)
Coefficient
b)
Subscript
c)
Atom
d)
Equation
16.
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
_CF4 + _Br2 -- _CBr4 + _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2
17.
Which coefficients balance this equation:
NH3 + O2 ----> NO + H2O
NH3 + O2 ----> NO + H2O
a)
2,3,5,6
b)
5,5,4,6
c)
4,6,4,5
d)
4,5,4,6
18.
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
19.
What is the arrow in a chemical equation...
H2 + O --> H2O
H2 + O --> H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
20.
Balance this equation.
_SnO2 +_H2-->_Sn +_H2O
_SnO2 +_H2-->_Sn +_H2O
a)
1,1,2,1
b)
1,2,1,1
c)
1,2,1,2
d)
1,2,2,1
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