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Chemical Reactions

Total questions: 79

Worksheet time: 2hrs 21mins

Name
Class
Date
1.

Determine the number of moles of AlNO3 that are in 264 g of the compound.

a)

2.97 mol

b)

3.45 mol

c)

2.73 mol

d)

1.86 mol

2.

Find the mass of 5.82 mol of MgCl2. Round to the nearest tenth.

a)

552.9 g

b)

436.8 g

c)

55.2 g

d)

555.9 g

3.

Determine the amount of moles in CuBr that are in 276.9 g of the compound.

a)

3.2 mol

b)

1.7 mol

c)

2.1 mol

d)

1.9 mol

4.

Find the mass of 3.8 mol of H2O. Round to the nearest tenth.

a)

57.9 g

b)

54.8 g

c)

68.4 g

d)

62.3 g

5.

How do we know a chemical reaction has taken place?

a)

Substances change in appearance

b)

Substances change in size

c)

Substances change in states, like from a liquid into a solid.

d)

New substances are formed

6.

Which of the following is a reactant in the following equation?


O2 + C6H12O6 > CO2 + H2O

a)

CO2

b)

H2O

c)

O2

7.

Which of the following is a product in the following equation?


O2 + C6H12O6 > CO2 + H2O

a)

CO2

b)

C6H12O6

c)

O2

8.

Substances that start a chemical reaction are known as the

a)

reactants

b)

products

c)

chemicals

d)

substances

9.

Substances created, or made, during a chemical reaction are known as the

a)

reactants

b)

products

c)

chemicals

d)

substances

10.

The law of conservation of mass can be demonstrated by a chemical reaction. Which of the following models of a chemical reaction best represents the law of conservation of mass?

a)
b)
c)
d)
11.

When carbon and oxygen combine chemically, the mass of the product is

a)

greater than the mass of the carbon plus the mass of the oxygen

b)

equal to the mass of the carbon plus the oxygen

c)

equal to the mass of the carbon

d)

less than the mass of the carbon

12.

The equation below shows the products formed when a solution of silver nitrate (AgNO3) reacts with a solution of sodium chloride (NaCl).

AgNO3 + NaCl → NaNO3 + AgCl


In this equation, the total mass of the reactants is

a)

greater than the total mass of the products

b)

equal to the total mass of the products

c)

equal to the mass of AgCl

d)

less than the mass of AgCl

13.
Which of the following equations demonstrates an actual chemical reaction that forms a new substance?
a)
A
b)
B
c)
C
d)
D
14.
All of the following reactions are correctly balanced except-
a)
A
b)
B
c)
C
d)
D
15.
Which of the following symbols is not a correct indication of the phase of a substance in a reaction? 
a)
(s)=solid
b)
(g)=grams
c)
(l)=liquid
d)
(aq)= aqueous
16.

Which is the correct chemical equation for the following: Solid Zn reacts with silver (I) chloride to produce Zinc (II) chloride and silver metal

a)

Zn + AgCl → ZnCl2 + Ag

b)

ZnCl2 + Ag → Zn + AgCl

c)

ZnCl2 + Ag2 → Zn + AgCl

d)

Zn2Cl + Ag → Zn + AgCl

17.

Which is the correct chemical equation for the following: Barium Chloride combined with sodium sulfide yields barium sulfide and sodium chloride

a)

BaCl + NaS → BaS+ NaCl

b)

BaCl2 + Na2S → BaS+ NaCl

c)

BaS+ NaCl → BaCl + NaS

d)

BaCl2 + Na2S → BaS+ NaCl2

18.
This appears on the left side of a chemical formula, and represents how many molecules there are. 
a)
An Atom
b)
The Subscript
c)
A Molecule
d)
The Coefficient
19.
How many oxygen atoms are in this chemical formula?
a)
7 oxygen atoms
b)
4 oxygen atoms
c)
3 oxygen atoms
d)
1 oxygen atoms
20.
How many molecules are in this chemical formula?
a)
5 molecules
b)
4 molecules
c)
2 molecules
d)
6 molecules
21.
__Na3PO4+__KOH v→ __NaOH + __ K3PO4
a)
1, 3, 3,1
b)
2, 2, 3,1 
c)
1, 2, 2,1
d)
3, 3, 3,1
22.
How many elements are in C6H12O6?
a)
6
b)
12
c)
3
d)
24
23.
The red numbers in the image below represent ________.
a)
subscripts
b)
coefficients
c)
I don't know.
d)
None of the answers are correct.
24.
The blue numbers in the image below represent ________.
a)
I don't know.
b)
coefficients
c)
subscripts
d)
None of the answers are correct.
25.
Is the following equation balanced or unbalanced?
Fe + S --> FeS
a)
balanced
b)
unbalanced
26.
How many oxygens are in Al₂(SO₄)₃?
a)
4
b)
12
c)
7
d)
24
27.
How many hydrogens are in 4H2O?
a)
6
b)
8
c)
2
d)
4
28.
Na3PO4 +  KOH ---> NaOH +  K3PO4
a)
1 Na3PO4+3 KOH
--->
3 NaOH +  1 K3PO4
b)
2 Na3PO4+2 KOH
--->
3 NaOH +  1 K3PO4
c)
1 Na3PO4+2 KOH
--->
2 NaOH +  1 K3PO4
d)
3 Na3PO4+3 KOH
--->
3 NaOH +  1 K3PO4
29.

What state of matter is this substance?

a)

solid

b)

liquid

c)

gas

d)

aqueous

30.

In what state is this substance?

a)

solid precipitate

b)

dissolved in water

c)

released as a gas

d)

liquid

31.

How many atoms of nitrogen are shown above?

a)

1

b)

2

c)

3

d)

4

32.

What are the blue numbers called?

a)

oxidation numbers

b)

subscripts

c)

group numbers

d)

product numbers

33.

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"

34.
How many oxygen atoms are present in the following? 
4Ca(OH)2
a)
4
b)
6
c)
8
d)
1
35.

Translate the following chemical equation into a sentence:

Mg (s) + 2HNO3 (aq) --> Mg(NO3)2 (aq) + H2 (g)

a)

Magnesium and hydrogen nitrate react to produce magnesium nitrate and hydrogen.

b)

Solid magnesium and nitric acid react to produce aqueous magnesium nitrate and hydrogen gas.

c)

Magnesium ribbon and aqueous hydrogen nitrate react to produce a magnesium nitrate precipitate and hydrogen grams.

d)

Smooth magnesium and aquaceous nitrate acid react to produce aquaceous magnesium nitrate reacts with hydrogen gas.

36.
___C3H8 +___O2 --> ___CO2 + ___H2O
a)
1,5,3,4
b)
2,10,6,8
c)
already balanced
d)
1,5,5,4
37.
__Al + __Fe3N2 -->__AlN + __Fe
a)
already balanced
b)
4,2,4,6
c)
2,1,2,3
d)
1,2,1,3
38.
__Na + __Cl2 --> __NaCl
a)
1,1,2
b)
2,1,2
c)
2,1,1
d)
already balanced
39.
__H2O2 --> __H2O + __O2
a)
already balanced
b)
2,1,1
c)
2,2,1
d)
2,1,2
40.
__BF3 + __Li2SO3 --> __B2(SO3)3 + __LiF
a)
2,3,1,3
b)
2,3,1,6
c)
4,4,2,12
d)
3,3,1,9
41.
The number of atoms you begin with in a chemical reaction ...
a)
must be the same as the number of  atoms you end with
b)
must be an even number
c)
can be different to the number you finish with
d)
changes depending on how much energy is formed
42.

Which type of reaction is:

2 NH3 + H2SO4 → (NH4)2SO4

a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Double Displacement
43.

Which type of reaction is:

2 H3AsO4 → As2O5 + 3 H2O

a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Combustion
44.
Which type of reaction is: C2H4 + 3 O2 → 2 CO2 + 2 H2O
a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Combustion
45.

Which type of reaction is:

4 (NH4)3PO4 + 3 Pb(NO3)4 → 12 NH4NO3 + Pb3(PO4)4

a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Double Displacement
46.

Which type of reaction is:

2 K + MgBr2 → 2 KBr + Mg

a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Double Displacement
47.
Provides evidence that a chemical reaction has occurred. 
a)
dissolving 
b)
melting
c)
formation of a gas
d)
bending
48.
Fill in the blanks with coefficient:
PCl5+_ H2O→_ HCl+H3PO4
a)
4, 5
b)
1, 6
c)
3, 8
d)
2,2
49.
Balance this 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
50.

The two sides of a chemical equation are called?

a)

Reactants (left) and Products (right)

b)

Ingredients (left) and Product (right)

c)

Cations and Anions

d)

Reactants (left) and Results (right)

51.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
52.
__Al + __Fe3N2 -->__AlN + __Fe
a)
already balanced
b)
4,2,4,6
c)
2,1,2,3
d)
1,2,1,3
53.
__BF3 + __Li2SO3 --> __B2(SO3)3 + __LiF
a)
2,3,1,3
b)
2,3,1,6
c)
4,4,2,12
d)
3,3,1,9
54.
The number of atoms you begin with in a chemical reaction ...
a)
must be the same as the number of  atoms you end with
b)
must be an even number
c)
can be different to the number you finish with
d)
changes depending on how much energy is formed
55.
Fill in the blanks with coefficient:
PCl5+_ H2O→_ HCl+H3PO4
a)
4, 5
b)
1, 6
c)
3, 8
d)
2,2
56.
Balance this 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
57.

Is the following equation balanced?

4Fe + 3O2 ---> 2Fe2O3

a)

YES

b)

NO

58.

Is the following equation balanced?

Al + O2 ---> 2Al2O3

a)

YES

b)

NO

59.
2 NH3+ 1 H2SO4 ----> 1 (NH4)2SO4
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
60.
CaCO3 ----> CaO + CO2
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
61.
Pb + FeSO4 ----> PbSO4 + Fe
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
62.
Na3PO4 + 3 KOH ----> 3 NaOH + K3PO4
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
63.

What type of reaction is the following:
C11H24+17O2−> 11CO2 + 12H2OC_{11}H_{24}+17O_2->\ 11CO_2\ +\ 12H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

64.

Identify the following chemical reaction.

2 NaBr + 1 Ca(OH)2 ----> 1 CaBr2 + 2 NaOH

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

65.

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

66.

Identify the following chemical reaction.

Pb + FeSO4 ----> PbSO4 + Fe

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

67.

What reaction has the following general formula:

AB --> A + B

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

68.

What reaction has the following general formula:

A + CD --> C + AD

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

69.

What reaction has the following general formula:

AB + CD --> CB + AD

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

70.

What reaction has the following general formula:

A + B --> AB

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

71.
N2 + 3H2 ---> 2NH3
If 3 moles of N2 reacts with 9 moles of H2, how many moles of NH3 will be produced.
a)
2
b)
4
c)
6
d)
12
72.
2Al2O3 ---> 4Al + 3O2
How many moles of Al2O3 is required to produce 10 moles of Al?
a)
4
b)
5
c)
10
d)
7
73.
2KClO3 ---> 2KCl + 3O2
If you start with 3 moles of KClO3, how many moles of O2 will be produced?
a)
1
b)
2.5
c)
3.0
d)
4.5
74.
How much will one mole of Na2S weight?
a)
77.99
b)
55.00
c)
87.01
d)
22.99
75.
How much will 2 moles of FeO2 weigh?
a)
127.7
b)
143.7
c)
175.70
d)
55.85
76.

Select the correct molar ratio taken from this balanced equation:


4 Al + 3 O2 --> 2 Al2O3

a)

1 mol Al = 1 mol Al2O3

b)

4 Al = 2 Al2O3

c)

4 mol Al = 2 mol Al2O3

d)

4 mol Al = 2 mol Al

77.

Select the correct molar ratio taken from this balanced equation:


1 N­2 + 3 H2 --> 2 NH3

a)

1 N­2 = 3 H2

b)

1 mol N­2 = 2 mol NH3

c)

2 mol N­2 = 1 mol NH3

d)

3 mol N­2 = 3 mol NH3

78.
2 KClO3 → 2 KCl + 3 O2
How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely?
a)
6.7 mol
b)
1.0 mol
c)
10.1 mol
d)
4.5 mol
79.
CH4 + 2 O2 → CO2 + 2 H2O
How many moles of carbon dioxide are produced from the combustion of 110 g of CH4?
a)
13.7 mol
b)
2.75 mol
c)
6.11 mol
d)
6.85 mol

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