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Worksheets

Chemical Equations

Total questions: 40

Worksheet time: 34mins

Name
Class
Date
1.

How many oxygen atoms are present in the following chemical formula?


4Ca(OH)2

a)

4

b)

6

c)

8

d)

1

2.

How many atoms of pretend element E are there in this silly chemical formula?


2E2Fg3Hi4

a)

4

b)

2

c)

1

d)

3

3.
Which of the following can be broken apart in a chemical reaction? 
a)
Noble gases
b)
Molecules and compounds
c)
only molecules
d)
only compounds 
4.

Determine what number goes in the blank to balance the chemical equation below.


2KI + ____Cl2 → 2KCl + I2

a)

1

b)

2

c)

3

d)

4

5.

What numerical coefficient should go in the blank space below to balance the chemical equation?


2Al +____ HCl → 2AlCl3 + 3H2

a)

2

b)

4

c)

3

d)

6

6.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
7.
CaCO3 represents a chemical
a)
Symbol
b)
Formula
c)
Subscript
d)
Reaction
8.
The substances listed on the left side of a chemical equation are the
a)
Products
b)
Coefficients
c)
Precipitates
d)
Reactants
9.

In chemical reactions, what does the principle of conservation of mass/matter mean?

a)

Matter is not created or destroyed.

b)

The total mass of the reactants is greater than the total mass of the products.

c)

The total mass of the reactants is less than the total mass of the products.

d)

Matter is not changed.

10.
Identify the reactant(s) and product(s) of the reaction.
a)
All three are reactants and none are products.
b)
Hydrogen and water are the reactants, and oxygen is the product.
c)
Water and oxygen are the reactants, and hydrogen is the product.
d)
Hydrogen and oxygen are the reactants, and water is the product.
11.
How many Oxygen (O) atoms are in 2C2HO8Cl2
a)
2
b)
16
c)
8
d)
5
12.
Which is the Law of Conservation of Matter?
a)
matter cannot be created or destroyed, it only changes form
b)
matter can be created but it cannot be destroyed, it never changes form
c)
matter can be destroyed but it cannot be created, it usually just changes form
d)
matter is an unproven theory created by Hans Geiger
13.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
14.

How many hydrogen atoms are there in 4H2O?

a)

6

b)

8

c)

2

d)

4

15.

Which of the following choices shows the correctly balanced chemical equation below?


Fe + O2 -> Fe2O3

a)

4Fe + 3O2 -> 2Fe2O3

b)

2 Fe + 3O2 -> Fe2O6

c)

4 Fe + O6 -> 2Fe2O3

d)

None of the options are correctly balanced.

16.

How many HCl molecules do you need to balance this equation?


Mg + __HCl ---> MgCl2 + H2

a)

1

b)

2

c)

3

d)

4

17.

Balance the following equation:


_Al +_HCl --> _H2 +_AlCl3

a)

2, 6, 3, 2

b)

it is already balanced

c)

4, 12, 3, 4

d)

2, 1, 4, 5

18.

Identify the Reactants in this equation.

a)

A

b)

B

19.

What state of matter is this substance?

a)

solid

b)

liquid

c)

gas

d)

aqueous

20.

Identify the number in blue.

a)

Product

b)

Reactant

c)

Coefficient

d)

Subscript

21.

In what state is this substance?

a)

solid precipitate

b)

dissolved in water

c)

released as a gas

d)

liquid

22.

How many atoms of nitrogen are in the compound shown above?

a)

1

b)

2

c)

3

d)

4

23.

What are the blue numbers called?

a)

oxidation numbers

b)

subscripts

c)

group numbers

d)

product numbers

24.

How many atoms of nitrogen are present in this molecule?

a)

1

b)

2

c)

3

d)

4

25.

Which compound is formed as a precipitate in this reaction?

a)

Pb(NO3)2

b)

KI

c)

PbI2

d)

KNO3

26.

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"

27.

Is the compound in the pink box a Reactant or a Product?

a)

Reactant

b)

Product

28.
CaCO3 represents a chemical
a)
Symbol
b)
Formula
c)
Subscript
d)
Reaction
29.

What type of reaction is represented by the equation below?


4Si + S8 --> 2Si2S4

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Double displacement

30.

What type of reaction is represented by the equation below?


3Ca + 2AlCl3 --> 3CaCl2 + 2Al

a)

Synthesis

b)

Decomposition

c)

Single diplacement

d)

Double displacement

31.

What type of reaction is represented by the equation below?


2Pb(NO3)2 --> 2PbO + 4NO2 + O2

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Combustion

32.

What type of reaction is represented by the equation below?


3Mg + N2 --> Mg3N2

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Combustion

33.

What type of reaction is represented by the equation below?


2NO2 --> N2 + 2O2

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Combustion

34.

What type of reaction is represented by the equation below?


P4 + 3O2 --> 2P2O3

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Combustion

35.

What type of reaction is represented by the equation below?


C4H12 + O2 --> CO2 + H2O

a)

Synthesis

b)

Combustion

c)

Single Replacement

d)

Double Replacement

36.

What type of reaction is represented by the equation below?


NH3 + HCl ---> NH4Cl

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

37.
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
38.

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


Choose the correctly balanced equation below that represents the word equation above.

a)

2Mg(s) + O2(g)→ 2MgO(s)

b)

Mg(s) + O(g) → MgO(s)

c)

2Mg(s) + CO2(g) → 2MgO(s) + C(s)

d)

2Mg(s) + O2(g) → Mg2O2(s)

39.

Sodium reacts with chlorine to produce sodium chloride.


Choose the correctly balanced equation below that represents the word equation above.

a)

NaCl(s) → Cl(g) + Na(s)

b)

Na(s) + CO2(g) → NaCO2(s)

c)

2Na(s) + Cl2(g) → 2NaCl(s)

d)

Na(s) + Cl(g) → NaCl

40.

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


Choose the correctly balanced equation below that represents the word equation above.

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)

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