WorksheetsBALANCING OF CHEMICAL EQUATIONS MARCH 1ST
Total questions: 30
Worksheet time: 1hrs 12mins
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.
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
5.
Balance this chemical reaction......?
__H2O2 ----> __H2O + O2
__H2O2 ----> __H2O + O2
a)
2H2O2 // 2H2O
b)
1H2O2 // 2H2O
c)
2H2O2 // 1H2O
d)
H2O2 // 2H2O
6.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
7.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
8.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
9.
How many Mn atoms are found in the following compound?
3Cr(MnO4)6
3Cr(MnO4)6
a)
3
b)
4
c)
6
d)
18
10.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
11.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
12.
Which of the following equations are correctly balanced?
a)
12CO2 +H2O --> C6H12O6 + O2
b)
CO2 + 9H2O --> C6H12O6 + O2
c)
CO2 + H2O --> 3C6H12O6 + O2
d)
6CO2 + 6H2O --> C6H12O6 + 6O2
13.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
a)
2,6,3,2
b)
it's already balanced
c)
4,12,3,4
d)
2,1,4,5
14.
Which number should go in the blank?
_ H2 + O2 -> 2 H2O
_ H2 + O2 -> 2 H2O
a)
1
b)
2
c)
3
d)
0
15.
Which number should go in the blank?
2 Na+ _ Cl2 -> 2 NaCl
2 Na+ _ Cl2 -> 2 NaCl
a)
1
b)
2
c)
3
d)
0
16.
Which number should go in the blank?
Mn + _ HNO3 → Mn(NO3)2 + H2
Mn + _ HNO3 → Mn(NO3)2 + H2
a)
1
b)
2
c)
3
d)
0
17.
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
18.
Balance the following equation:
___ H2+ ___ O2→___ H2O
a)
1, 1, 3
b)
2, 2, 2
c)
1, 2, 1
d)
2,1, 2
19.
Balance the following equation:
___ Mg+ ___ O2→___ MgO
a)
1, 1, 3
b)
2, 1, 2
c)
1, 2, 1
d)
2, 2, 2
20.
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
21.
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
22.
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
23.
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
24.
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
25.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CO + __Fe2O3--> __Fe + __CO2
a)
3,1 --> 2,3
b)
3,2 --> 1,1
c)
3,2 --> 2,4
d)
3,2 --> 2,1
26.
PCl5 + ___ H2O → ___ HCl + H3PO4
a)
4, 5
b)
1, 6
c)
3, 8
d)
2,2
27.
__ Al + __ FeO → Al2O2 + __ Fe
a)
1, 1, 2
b)
2,1,2
c)
2, 2, 2
d)
2,4,2
28.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__H2 + __S --> __H2S
a)
1,1 --> 1
b)
2,2 --> 2
c)
1,2 --> 1
d)
1,2 --> 2
29.
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
30.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__Na + __H2O --> __NaOH + __H2
a)
2,2 --> 2,1
b)
4,4 --> 4,1
c)
1,2 --> 2,4
d)
1,2 --> 2,1
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