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Balancing Equations and Reaction Types

Total questions: 72

Worksheet time: 3hrs 45mins

Name
Class
Date
1.

Balance the following equation:

__ HCl + __ NaOH → __NaCl + __H2O

a)

2 HCl +2 NaOH → 2 NaCl + 3 H2O

2, 2, 2, 3

b)

1 HCl + 2 NaOH → 1 NaCl + 2H2O

1, 2, 1, 2

c)

2 HCl + 6 NaOH → 4 NaCl + 1 H2O

2,6,4,1

d)

1 HCl + 1 NaOH → 1 NaCl + 1 H2O

1, 1, 1, 1

2.

Balance the following equation:

__ H3PO4 + __ KOH → __ K3PO4 + __ H2O

a)

1 H3PO4 + 3 KOH → 1 K3PO4 + 3 H2O

1, 3, 1, 3

b)

3 H3PO4 + 3 KOH → 1 K3PO4 + 1 H2O

3, 3, 1, 1

c)

3 H3PO4 + 1 KOH → 3 K3PO4 + 1 H2O

3, 1, 3, 1

d)

6 H3PO4 + 2 KOH → 6 K3PO4 + 2 H2O

6, 2, 6, 2

3.

Balance the following equation:

__ K + __ B2O3 → __ K2O + __ B

a)

2, 3, 1, 6

b)

6, 1, 3, 2

c)

1, 2, 3, 6

d)

2, 6, 3, 1

4.

Balance the following equation:

__ Na + __ NaNO3 → __Na2O + __N2

a)

6, 1, 2, 5

b)

10, 2, 6, 1

c)

5, 3, 1, 2

d)

20, 4, 12, 2

5.

Balance the following equation:

__ C + __ S8 → __ CS2

a)

4, 4, 1

b)

2, 2, 1

c)

4, 1, 4

d)

2, 1, 2

6.

You are given some Sodium (Na) and Oxygen (O2) and asked to combine them to form Sodium Oxide (Na2O). What is the balanced skeleton equation?

__ Na + __ O2 → __Na2O

a)

4 Na + 1 O2 → 2Na2O

b)

8 Na + 2 O2 → 4Na2O

c)

3 Na + 2 O2 → 2Na2O

d)

1 Na + 2 O2 → 4Na2O

7.

Balance the following equation:

__ N2 + __ O2 → __ N2O5

a)

2, 5, 2

b)

5, 2, 2

c)

4, 10, 4

d)

6, 3, 4

8.

Balance the following equation:

__ H3PO4 + __ Mg(OH)2 → __ Mg3(PO4)2 + __H2O

a)

6, 2, 1, 3

b)

4, 4, 1, 7

c)

2, 3, 1, 6

d)

1, 6, 9, 4

9.

Balance the following equation:

__ NaOH + __ H2CO3 → __ Na2CO3 + __ H2O

a)

1, 2, 1, 2

b)

4, 2, 2, 4

c)

1, 3, 1, 3

d)

2, 1, 1, 2

10.

Balance the following equation:

__ KOH + __ HBr → __ KBr + __ H2O

a)

8, 8, 2, 2

b)

1, 1, 1, 1

c)

4, 2, 2, 4

d)

2, 2, 2, 2

11.

Gunner and Mason are in a chemistry lab. They are given some Sodium (Na) and Oxygen (O2) and asked to react them to form Sodium Oxide (Na2O). Balance the following equation:

__ Na + __ O2 → __Na2O

a)

2 Na + 4 O2 → 1 Na2O

2, 4, 1

b)

4 Na + 1 O2 → 2 Na2O

4, 1, 2

c)

8 Na + 2 O2 → 4Na2O

8, 2, 4

d)

9 Na +1 O2 → 3Na2O

9, 1, 3

12.

Balance the following equation:

__ Al + __ S8 → __Al2S3

a)

3, 8, 16

b)

32, 6, 16

c)

8, 16, 1

d)

16, 3, 8

13.

Balance the following equation:

__ Cs + __ N2 → __ Cs3N

a)

1, 6, 2

b)

6, 1, 2

c)

12, 2, 4

d)

2, 1, 6

14.

Balance the following equation:

__ Mg + __ Cl2 → __ MgCl2

a)

1, 1, 1

b)

2, 2, 2

c)

1, 2, 1

d)

3, 2, 1

15.

Balance the following equation:

__ Rb + __ RbNO3 → __ Rb2O + __ N2

a)

10, 2, 6, 1

b)

1, 6, 2, 10

c)

6, 2, 10, 1

d)

3, 5, 7, 6

16.

You are trying to create ammonia (NH3) by combining nitrogen (N2) and hydrogen (H2). Balance the following equation:

__ N2 + __ H2 → __ NH3

a)

2, 3, 1

b)

2, 1, 3

c)

3, 1, 2

d)

1, 3, 2

17.

Balance the following equation:

__ C10H22 + __ O2 → __ CO2 + __ H2O

a)

22, 31, 20, 2

b)

31, 20, 2, 22

c)

2, 31, 20, 22

d)

20, 22, 2, 31

18.

Balance the following equation:

__ Al(OH)3 + __ HBr → __ AlBr3 + __ H2O

a)

1, 1, 3, 3

b)

1, 3, 1, 3

c)

3, 1, 3, 1

d)

3, 3, 1, 1

19.
Balance this equation...
H2 + Cl2 --> HCl
a)
It is balanced 
b)
3H2 + Cl2 --> 6H2Cl
c)
H2 + Cl2 --> 2HCl
20.
Balance this equation...
HgO --> Hg + O2
a)
It is balanced 
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
21.

Identify the type of reaction shown.

a)

Single replacement

b)

Double replacement

c)

Combustion

d)

Synthesis

22.

Identify the type of reaction shown.

a)

Single replacement

b)

Double replacement

c)

Combustion

d)

Synthesis

23.

Identify the type of reaction shown.

a)

Single replacement

b)

Double replacement

c)

Combustion

d)

Decomposition

24.

Identify the type of reaction shown.

a)

Single replacement

b)

Double replacement

c)

Synthesis

d)

Decomposition

25.

Identify the type of reaction shown.

a)

Single replacement

b)

Double replacement

c)

Synthesis

d)

Decomposition

26.

Identify the following chemical reaction.

3 HBr + 1 Al(OH)3 ----> 3 H­2O + 1 AlBr3

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

27.

Identify the following chemical reaction.

Pb + FeSO4 ----> PbSO4 + Fe

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

28.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

29.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

30.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

31.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

32.

What is the general reaction scheme for a decomposition reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

A + CD --> C + AD

d)

AB + CD --> CB + AD

e)

CxHy+O2 −> CO2+H2OC_xH_y+O_2\ ->\ CO_2+H_2O

33.
4Si + S8 --> 2Si2S4
a)
Synthesis
b)
Decomposition
c)
Single displacement
d)
Double displacement
34.
3Ca + 2AlCl3 --> 3CaCl2 + 2Al
a)
Synthesis
b)
Decomposition
c)
Single diplacement
d)
Double displacement
35.
3KOH + H3PO4 --> K3PO4 + 3H2O
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Double displacement
36.
2Pb(NO3)2 --> 2PbO + 4NO2 + O2
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Combustion
37.
4Si + S8 --> 2Si2S4
a)
Synthesis
b)
Decomposition
c)
Single displacement
d)
Double displacement
38.
3Ca + 2AlCl3 --> 3CaCl2 + 2Al
a)
Synthesis
b)
Decomposition
c)
Single diplacement
d)
Double displacement
39.
3KOH + H3PO4 --> K3PO4 + 3H2O
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Double displacement
40.
2Pb(NO3)2 --> 2PbO + 4NO2 + O2
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Combustion
41.
3Mg + N2 --> Mg3N2
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Combustion
42.
2NO2 --> N2 + 2O2
a)
Synthesis
b)
Decomposition
c)
Single displacement
d)
Combustion
43.
P4 + 3O2 --> 2P2O3
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Combustion
44.
Fe + H2SO4 --> Fe2(SO4)3 + H2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
45.
Which of the following is the general formula for a decomposition reaction?
a)
A + B  → AB
b)
AB → A + B
c)
AB + C → AC + B
d)
AB + CD → AC + BD
46.
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
47.
Balance this equation:
 __Li + __Cl2 -> __LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li +  Cl2 -> 2LiCl
48.
H2SO4 + Fe -->H2 + FeSO4
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
49.
PbCl2 + AgNO3 ---> Pb(NO3)2 + AgCl 
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
50.
NH3 + HCl ---> NH4Cl 
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
51.
Which chemical reaction switches 2 elements?
a)
Double Replacement
b)
Single Replacement
c)
Combustion
d)
Decomposition
52.
Which chemical reaction takes place when 2 substances react to form a single product?
a)
Decomposition
b)
Double Replacement
c)
Single Replacement
d)
Synthesis
53.
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
54.

Which of the following chemical equations is correctly balanced? More than one answer may be correct.

a)

2 Li  +  O2  →  LiO2

b)

Ag  +  2 HCl  →  AgCl  +  H2

c)

2 C3H6  +  9 O2  →  6 CO2  +  6 H2O

d)

MgCl2  →  Mg  + Cl2

55.

Potassium (K) combines with magnesium bromide (MgBr2) to form potassium bromide (KBr) and magnesium (Mg) during a chemical reaction.

Which of the following shows the balanced chemical equation for this reaction?

a)

2K + MgBr  >  

2KBr + Mg

b)

2K + MgBr2  >  2KBr + Mg

c)

K + MgBr2  > 

KBr + Mg

d)

K + MgBr2  >  KBr2 + Mg

56.

The chemical reaction shown below shows lead chloride decomposing into lead and chlorine.

PbCl2 --> Pb + Cl2

Does the chemical reaction shown obey the law of conservation of mass?

a)

No, because a new molecule is produced.

b)

No, because one particle breaks into two particles.

c)

Yes, because the equation is balanced.

d)

Yes, because the number of molecules of Cl2 and atoms of Pb are equal.

57.

Balance this equation... H2 + Cl2 --> HCl

a)

It is balanced

b)

H2 + Cl2 --> 2HCl

c)

3H2 + Cl2 --> 6H2Cl

58.

Which of the following shows the correct way to balance the chemical equation?

Fe + O2 -> Fe2O3

a)

4Fe+3O2 --> 2Fe2O3

b)

2Fe + 3O2 -> Fe2O6

c)

4Fe+O6 --> 2Fe2O3

59.

Balance this equation. CF4 + Br2 --> CBr4 + F2

a)

2CF4 + Br2 --> 2CBr4 + F2

2,1,2,1

b)

CF4 + 2Br2 --> CBr4 + 2F2

1,2,1,2

c)

CF4 + 2Br2 --> 2CBr4 + F2

1,2,2,1

d)

2CF4 + 2Br2 --> 2CBr4 + 2F2

2,2,2,2

60.

Which skeleton equation is balanced correctly?

a)

PbO2 + 2H2

b)

SO2 + H2O --> H2SO4

c)

2Na + 2H2O --> 2NaOH + H2

61.

Iron reacts with sulfur to produce iron(II) sulfide powder.

a)
2Fe(s) + S(s) → Fe2S(s)
b)
Fe(s) + S(s) → FeS(s)
c)
Fe(s) + S(g) → FeS(s)
d)
4Fe(s) + S2(g) → 2Fe2S
62.

When lead reacts with oxygen, a yellow lead(II) oxide powder is produced.

a)
2Pb(s) + O2(g) → 2PbO(s)
b)
Pb(s) + O2(g) → PbO2(aq)
c)
4Pb(s) + O2(g) → 2Pb2O(g)
d)
Pb(s) + O(g) → PbO(s)
63.

When hydrogen reacts with sulfur, a smelly gas call hydrogen sulfide is produced:

a)
H2(g) + 2S(s) → 2HS
b)
H2(g) + S(s) → H2S(g)
c)
H(g) + S(s) → HS(g)
d)
2H(g) + S(s) → H2S(g)
64.

Magnesium can be burned in oxygen to produce solid magnesium oxide.

a)

Mg + O2→ MgO

b)

Mg+ O→ MgO

c)

Mg + CO2 → MgO + C

d)

Mg + O2→ Mg2O2

65.

Hydrogen gas and nitrogen monoxide gas forms water and nitrogen gas.

a)

H2 + NO --> H2O + N2

b)

H + NO --> H2O + N

c)

H2 + N2O3 --> H2O + N2

d)

H + NO --> H2O + N2

66.

Potassium chlorate solid when heated produces potassium chloride solid and oxygen gas.

a)

KClO3 + heat --> KCl + O2

b)

PClO3 + heat --> PCl + O2

c)

KClO3 + heat --> KCl + O

d)

KCl + heat --> KCl + O2

67.

sodium phosphate and calcium chloride produce calcium phosphate and sodium chloride

a)

Na3PO4 + CaCl2 --> Ca3(PO4)2 + NaCl

b)

Na3PO4 + CaCl2 --> Ca4PO2 + NaCl

c)

NaPO4 + CaCl2 --> Ca(PO4)2 + NaCl

d)

NaPO4 + CaCl2 --> Ca2(PO4)3 + NaCl

68.

Aluminum bromide and chlorine gas produce aluminum chloride and bromine gas.

a)

AlBr3 + Cl2 --> AlCl3 + Br2

b)

AlBr3 + Cl --> AlCl3 + Br

c)

Al3Br + Cl --> Al3Cl + Br2

d)

AlBr3 + Cl2 --> AlCl3 + Br

69.

Barium metal and water yields barium hydroxide and hydrogen gas

a)

Ba + H2O --> Ba(OH)2 + H2

b)

Ba2 + H2O --> Ba(OH)2 + H

c)

Ba + H2O --> BaOH2 + H

d)

Ba2 --> Ba(OH)2 + H2

70.

Hydrogen gas and chlorine gas produce hydrogen chloride

a)

H2 + Cl2 --> HCl

b)

H + Cl --> HCl

c)

H2 + Cl2 --> H2Cl2

d)

H + Cl --> H2Cl

71.

Aluminum and oxygen produces aluminum oxide

a)

Al + O2 --> Al2O3

b)

Al + O --> Al2O3

c)

Al3 + O2 --> Al2O3

d)

Al + O --> AlO

72.

Copper and silver sulfate produces copper (II) sulfate and silver

a)

Cu + Ag2SO4 --> CuSO4 + Ag

b)

Cu2 + Ag2SO4 --> CuSO4 + Ag

c)

Cu + Ag2S --> CuS + Ag

d)

Cu2 + AgSO4 --> CuSO4 + Ag2

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