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Balancing Chemical Equations

Total questions: 77

Worksheet time: 1hrs 28mins

Name
Class
Date
1.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
2.

Which equation is balanced?

a)

PbO2 + 2H2

b)

SO2 + H20 --> H2SO4

c)

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

3.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
4.

What law governs the balancing of chemical equations?

a)

Law of Energy

b)

Law of Conservation of Matter/Mass

c)

Law of Gravity

d)

Law of Matter Movement

5.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
6.

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

7.
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
8.

What are the coefficients that would properly balance this 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

9.

What are the coefficients that would properly balance this equation?

__H2 + __S --> __H2S

a)

1,1 --> 1

b)

2,2 --> 2

c)

1,2 --> 1

d)

1,2 --> 2

10.

What are the coefficients that would properly balance this equation?

__Al + __O2--> __Al2O3

a)

4,1 --> 2

b)

4,3 --> 4

c)

3,4 --> 1

d)

4,3 --> 2

11.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
12.

Determine the coefficients to make the following equation balanced?

__N2 + __O2--> __NO

a)

1, 1, 1

b)

1, 1, 2

c)

2, 2, 2

d)

1, 2, 2

13.

Determine the coefficients to balance the 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.

Balance the the following equation.

__Zn+__HCl -->__ZnCl2 +__H2

a)

1,1,2,1

b)

1,1,1,2

c)

1,2,1,1

d)

2,1,1,1

15.
Which number should go in the blank?
Mn + _ HNO3 → Mn(NO3)2 + H2
a)
1
b)
2
c)
3
d)
0
16.
Which number should go in the blank?
Al(NO3)3 + _  NaOH -> Al(OH)3 + 3 NaNO3
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
a)
1
b)
2
c)
3
d)
0
18.
The numbers needed to balance the equation are:
a)
1, 1, 1, 2
b)
1, 1, 2, 2
c)
1, 1, 1, 1
d)
2, 3, 1, 3
19.
The numbers needed to balance the equation are:
a)
2, 7, 6, 4
b)
2, 1, 3, 2
c)
1, 1, 3, 2
d)
2, 3, 1, 3
20.
The numbers needed to balance the equation are:
a)
2, 7, 6, 4
b)
2, 1, 3, 2
c)
3, 1, 1, 3
d)
2, 3, 1, 3
21.
The numbers needed to balance the equation are:
a)
2, 7, 6, 4
b)
2, 1, 3, 2
c)
3, 1, 1, 3
d)
2, 3, 1, 3
22.

Chemical Reaction

a)

a substance formed as a result of a chemical reaction

b)

a change in matter that produces one or more new substances

c)

the process in which substances undergo chemical changes that result in the formation of new substances

d)

a substance that enters into a chemical reaction

23.

Chemical Equation

a)

A representation of a chemical reaction

b)

the starting materials in a chemical reaction

c)

the new substances that are formed in a chemical reaction

d)

tells how many atoms, molecules, or formula units take part in a reaction

24.

The Law of Conservation of Matter

a)

tells how many atoms of an element are contained in one molecule or formula unit.

b)

the starting materials in a chemical reaction

c)

the new substances that are formed in a chemical reaction

d)

A law stating that atoms are not created or destroyed during a chemical reaction.

25.

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

26.

The coefficient in 3H2O is

a)

6

b)

5

c)

2

d)

3

27.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
28.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
29.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
30.
Balance this equation...
HgO --> 2Hg + O2
a)
It is balanced 
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
31.
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
32.

How many valence electrons does magnesium have?

a)

6

b)

12

c)

2

d)

10

33.

What are valence electrons?

a)

electrons in the outermost energy level

b)

electrons in the innermost energy level

c)

positively charged ions

d)

energy used for attraction in a shell

34.

How many valence electrons does elements in group 16 have?

a)

16

b)

1

c)

6

d)

0

35.

What is a cation?

a)

a negatively charged ion

b)

an ion with many charges

c)

a positively charged ion

36.

What is an anion?

a)

a positively charged ion

b)

a negatively charged ion

c)

a neutral charged ion

37.

What does the symbol inside the circle mean?

a)

"yields, or produces"

b)

"dissolved in water"

c)

"forms a precipitate"

d)

"released as a gas"

38.

Balance this equation, CaCO3(s) → CaO(s) + CO2(g)?

a)

3,1,2

b)

1,1,1

c)

1,3,1

d)

2,6,3

39.

Write a balanced chemical equation for the following reaction.


Iron metal reacts with water to form Fe3O4 and hydrogen gas.

4 lines
40.
Balance this equation:
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
41.
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.
42.

Ca + AlCl3 --> CaCl2 + Al

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

43.

3Mg + N2 --> Mg3N2

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

44.

NO2 --> N2 + O2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

double replacement

45.

AgF + CaCl2 ---> AgCl + CaF2

a)

double replacement

b)

decomposition

c)

single replacement

d)

synthesis

46.

Which type of reaction is described in the following equation:

C3H8 + 5O2 → 3CO2 + 4H2O

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

47.
The substances listed on the left side of a chemical equation are the
a)
Products
b)
Coefficients
c)
Precipitates
d)
Reactants
48.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
49.

What physical state symbol should be included for glucose?

a)

(s) - solid

b)

(l) - liquid

c)

(g) - gas

d)

(aq) - aqueous

50.

What physical state symbol should be included for oxygen?

a)

(s) - solid

b)

(l) - liquid

c)

(g) - gas

d)

(aq) - aqueous

51.

What physical state symbol should be included for carbon dioxide?

a)

(s) - solid

b)

(l) - liquid

c)

(g) - gas

d)

(aq) - aqueous

52.

Why does oxygen's symbol have a subscript "2"?

a)

Because it is monoatomic.

b)

Because it is diatomic.

c)

Because it is triatomic.

53.

The coefficient in 3H2O is

a)

6

b)

5

c)

2

d)

3

54.

What is the little number after an element in a chemical equation called?

Example: H2

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

55.

What is the number before a chemical formula called?

Example: 2H2 + O2 ---> 2H2O

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

56.
This is used to represent the amount of each atom in a molecule. What is the arrow pointing to?
a)
Exponent
b)
Coefficient
c)
Molecule
d)
Subscript
57.

Write the equation for the following:

nickel (III) hydroxide reacts with copper to form nickel and copper (II) hydroxide

a)

Ni(OH) + Cu → Ni + Cu(OH)

b)

NiOH3 + Cu → Ni + CuOH2

c)

Ni(OH)3 + Cu → Ni + Cu(OH)2

d)

Ni(OH)3 + Cu2+ → Ni3+ + Cu(OH)2

58.
What will weigh more when a chemical change is complete?  The reactants before the chemical reaction, or the product after the reaction is complete?
a)
They both will weigh the same
b)
The product always weighs more than the reactant
c)
The reactant will weigh more than the product
d)
They both will loose mass after the reaction
59.

Write the equation for the following:

calcium reacts with oxygen to form calcium oxide

a)

Ca + O → CaO

b)

Ca + O2 → CaO

c)

Ca2+ + O2 → CaO

d)

Ca2+ + O → CaO

60.

Write the equation for the following:

nickel (III) hydroxide reacts with copper to form nickel and copper (II) hydroxide

a)

Ni(OH) + Cu → Ni + Cu(OH)

b)

NiOH3 + Cu → Ni + CuOH2

c)

Ni(OH)3 + Cu → Ni + Cu(OH)2

d)

Ni(OH)3 + Cu2+ → Ni3+ + Cu(OH)2

61.

Write the equation for the following:

copper (II) chloride reacts lithium carbonate to form lithium chloride and copper (II) carbonate

a)

CuCl2 + Li2CO3 → LiCl + CuCO3

b)

Cu2+Cl1- + Li1+CO32- → Li1+Cl1- + Cu2+CO32-

c)

Cu2Cl + Li(CO3)2 → LiCl + Cu2(CO3)2

d)

CuCl + LiCO3 → LiCl + CuCO3

62.

Write the equation for the following:

fluorine and sodium chloride react to form sodium fluorine and chlorine.

a)

F + NaCl → NaF + Cl

b)

F + Na1+Cl1- → Na1+F1- + Cl

c)

F2 + Na1+Cl1- → Na1+F1- + Cl2

d)

F2 + NaCl → NaF + Cl2

63.

Write the net ionic equation for the following:

Na2SO4(aq) + AgNO3(aq) → Ag2SO4(s) + NaNO3

a)

Ag1+ + SO42- → Ag2SO4(s)

b)

2Ag1+ + SO42- → Ag2SO4(s)

c)

Ag + SO4 → Ag2SO4(s)

d)

No Reaction

64.

Write the net ionic equation for the following:

lithium hydroxide and barium nitrate react to form solid barium hydroxide and lithium nitrate

a)

LiOH + Ba(NO3)2 → LiNO3 + Ba(OH)2

b)

Ba2+ + OH1- → Ba(OH)

c)

Ba2+ + OH1- → Ba(OH)2

d)

Ba2+ + 2OH1- → Ba(OH)2

65.

Write the net ionic equation for the following:

lithium hydroxide and potassium carbonate reacts to form aqueous lithium carbonate and aqueous potassium hydroxide

a)

LiOH + K2CO3 → Li2CO3 + KOH

b)

K1+ + OH1- → KOH

c)

2Li1+ + CO32- → Li2CO3

d)

No Reaction

66.

Write the net ionic equation for the following:

lithium hydroxide and potassium carbonate reacts to form aqueous lithium carbonate and aqueous potassium hydroxide

a)

LiOH + K2CO3 → Li2CO3 + KOH

b)

K1+ + OH1- → KOH

c)

2Li1+ + CO32- → Li2CO3

d)

No Reaction

67.

Translate the word equation below.

Sulfur Trioxide reacts with Water to form Sulfuric Acid (H2SO4).

a)

SO3 + H2O → H2SO4SO_3\ +\ H_2O\ \rightarrow\ H_2SO_4

b)

SO3 → H2O + H2SO4SO_3\ \rightarrow\ H_2O\ +\ H_2SO_4

c)

SO2 + H2O → H2SO4SO_2\ +\ H_2O\ \rightarrow\ H_2SO_4

d)

SO → H2O + H2SO4SO\ \rightarrow\ H_2O\ +\ H_2SO_4

68.

Translate the word equation below.

Carbon Dioxide and Hydrogen react to form Methane (CH4) and Water

a)

CO2 + H2O → CH4 +H2 CO_{2_{\ }}+\ H_2O\ \rightarrow\ CH_4\ +H_2\

b)

CO2 → H2 + CH4 + H2OCO_2\ \rightarrow\ H_2\ +\ CH_4\ +\ H_2O

c)

CO2 + H2 + CH4 → H2OCO_2\ \ +\ H_2\ +\ CH_4\ \ \rightarrow\ H_2O

d)

CO2 + H2 → CH4 + H2OCO_2\ \ +\ H_2\ \rightarrow\ CH_4\ +\ H_2O

69.

Translate the word equation below.

Hydrogen and Carbon Dioxide react to form Carbonic Acid (H2CO3).

a)

H + CO2 → H2CO3H\ +\ CO_2\ \rightarrow\ H_2CO_3

b)

H → CO2 + H2CO3H\ \rightarrow\ CO_2\ +\ H_2CO_{3_{ }}

c)

H2 + CO2 → H2CO3H_2\ +\ CO_2\ \rightarrow\ H_2CO_3

d)

H2 → CO2 + H2CO3H_2\ \rightarrow\ CO_2\ +\ H_2CO_3

70.

Translate the word equation below.

Aluminum and Hydrochloric Acid (HCl) react to form Aluminum Chloride and Hydrogen

a)

Al + HCl → AlCl3 → H2Al\ +\ HCl\ \rightarrow\ AlCl_3\ \rightarrow\ H_2

b)

Al + HCl → AlCl + H2Al\ +\ HCl\ \rightarrow\ AlCl\ +\ H_2

c)

Al + HCl → AlCl3 + H2Al\ +\ HCl\ \rightarrow\ AlCl_3\ +\ H_2

d)

Al + HCl → AlCl + HAl\ +\ HCl\ \rightarrow\ AlCl\ +\ H

71.

___ AlBr3 + ___ Cl2 ----> ___ AlCl3 +___ Br2

a)

2, 2, 3, 3

b)

2, 3, 2, 3

c)

2, 3, 3, 2

d)

1, 2, 3, 4

72.

___ H2 +___O2 ----> ____ H2O

a)

1, 2, 2

b)

2, 2, 1

c)

1, 2, 3

d)

2, 1, 2

73.

____ H2 + ____ N2 ----> ____ NH3

a)

1, 2, 3

b)

3, 1, 2

c)

3, 2, 1

d)

1, 3, 2

74.

Give the correct coefficients to balance the following chemical equation:

_ KClO3 ----> _ KCl + _ O2

(a)  

75.
What are the smaller numbers that you CANNOT change in a chemical equation? 
a)
Coefficient
b)
Products
c)
Reactants
d)
Subscript
76.
What are the larger numbers that you CAN CHANGE in a chemical equation? 
a)
Coefficient 
b)
Products
c)
Reactants
d)
Subscripts
77.
Balance this chemical reaction......?  
__H2O2 ---->  __H2O + O2
a)
2H2O2  //  2H2O
b)
1H2O2  //  2H2O
c)
2H2O2  //  1H2O
d)
H2O2  //  2H2O

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