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Worksheets

Chemical Equations

Total questions: 25

Worksheet time: 33mins

Name
Class
Date
1.

Identify the Reactants in this equation.

a)

A

b)

B

2.

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"

3.

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

a)

Reactant

b)

Product

4.
Why must we balance chemical equations? 
a)
Our teacher said so
b)
to abide by the law of conservation of energy
c)
to abide by the law of conservation of mass
5.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
6.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
7.
How many oxygen atoms are present in the following? 
4Ca(OH)2
a)
4
b)
6
c)
8
d)
1
8.
Which of the following shows the correct way to balance the chemical equation?
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.
9.

Identify the reaction type:

C2H6 + O2 --> CO2 + H2O

a)

Double replacement

b)

Synthesis

c)

Acid base

d)

Combustion

10.

Identify the reaction type for the following equation:

K + F2 --> KF

a)

Double replacement

b)

Single Replacement

c)

Synthesis

d)

Decomposition

11.

Identify the type of reaction:

ZnCl2 + Mg --> Zn + MgCl2

a)

Precipitate

b)

Single Replacement

c)

Double Replacement

d)

Decomposition

12.

PCl5 + ___ H2O → ___ HCl + H3PO4

a)

4, 5

b)

1, 6

c)

3, 8

d)

2,2

13.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
14.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
15.
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
16.

What kind of a chemical reaction is shown below?

Mg3(PO4)2 + H2  ⟶ Mg + H3PO4Mg_3\left(PO_4\right)_2\ +\ H_{2\ \ }\longrightarrow\ Mg\ +\ H_3PO_4

a)

Synthesis

b)

Single Replacement

c)

Double Replacement

d)

Combustion

17.

Identify the reaction type:

NaCl + KOH --> KCl + NaOH

a)

Double replacement

b)

Combustion

c)

Synthesis

d)

Single Replacement

18.

Identify the reaction type:

H2O2 --> H2O + O2

a)

Decomposition

b)

Synthesis

c)

Combustion

d)

Acid Base

19.
Based on the activity series, will this reaction occur?
Ni (s) + H2O (l) →
a)
Yes
b)
No
20.
Based on the activity series, will this reaction occur?
Br2 (l) + KI (aq) →
a)
Yes
b)
No
21.

Predict the product(s) of this reaction (don't worry about balancing):

Li + H2O →

a)

Li2O + H2

b)

LiO + H2

c)

LiOH + H2

d)

Li(OH)2

22.

Predict the product(s) of this reaction (don't worry about balancing):

Mg + HCl →

a)

MgHCl

b)

MgCl2 + H2

c)

MgCl2 + H

d)

MgCl + H2

23.

Calcium carbonate (CaCO3)

a)

Soluble

b)

Insoluble

24.

Identify the precipitate in the reaction:

2NaOH + MgCl2 → 2NaCl + Mg(OH)2

a)

NaOH

b)

MgCl2

c)

NaCl

d)

Mg(OH)2

25.

Identify the precipitate in the reaction:

Pb(NO3)2 + 2NaCl → 2NaNO3 + PbCl2

a)

Pb(NO3)2

b)

NaCl

c)

NaNO3

d)

PbCl2

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