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Winter break review Balancing equations

Total questions: 45

Worksheet time: 2hrs 30mins

Name
Class
Date
1.

what is a reactant?

a)

a volatile chemical

b)

a dangerous substance

c)

the substance(s) you start with in a chemical reaction

d)

the substance(s) you end with in a chemical reaction

2.

what is a product?

a)

a volatile chemical

b)

a dangerous substance

c)

the substance(s) you start with in a chemical reaction

d)

the substance(s) you end with in a chemical reaction

3.

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

4.

What mathematical function do coefficients perform in a balanced equation?

a)

addition

b)

multiplication

c)

subtraction

d)

division

5.

When the equation is balanced what are the correct coefficients?



a)

1, 1, 2

b)

 1, 3, 1

c)

2, 2, 3

d)

2, 3, 2

6.

What are the correct coefficients when the equation is balanced?

a)

2, 3, 4

b)

4, 3, 2

c)

1, 1, 2

d)

2, 1, 1

7.

Which of the following is an example of a synthesis reaction?

a)
b)
c)
d)
8.

Which of the following is an example of a decomposition reaction?

a)
b)
c)
d)
9.

Which of the following is an example of a single replacement reaction?

a)
b)
c)
d)
10.

Which of the following is an example of a double replacement reaction?

a)
b)
c)
d)
11.

The red numbers in the image represent

a)

subscripts

b)

coeffiecients

c)

roman numerals

d)

none of the answer options are correct

12.

The blue numbers in the image represent

a)

subscripts

b)

coeffiecients

c)

roman numerals

d)

none of the answer options are correct

13.

When balanced, the correct coefficients for the equation are:

a)

1, 3, 3, 1

b)

1, 3, 2, 1

c)

2, 3, 3, 1

d)

1, 1, 3, 1

14.

When balanced, the correct coefficients for the equation are:

a)

2, 1, 3, 1

b)

1, 2, 1, 2

c)

1, 2, 2, 1

d)

2, 1, 1, 2

15.

When balanced, the correct coefficients for the equation are:

a)

3, 1, 2, 1

b)

1, 2, 3, 4

c)

2, 1, 2, 1

d)

1, 2, 1, 1

16.

When balanced, the correct coefficients for the reaction are:

a)

1, 1, 1, 1

b)

1, 2, 1, 1

c)

2, 1, 1, 2

d)

2, 1, 2, 1

17.

When balanced, the correct coefficients for the reaction are:

a)

1, 1, 1, 1

b)

1, 2, 1, 1

c)

2, 1, 1, 2

d)

2, 1, 2, 1

18.

When balanced, the correct coefficients are:

a)

2, 2, 2

b)

2, 2, 3

c)

3, 2, 2

d)

1, 2, 3

19.

Why must the number of atoms on either side of the arrow be equal to each other in a chemical equation?

a)

to abide by the law of conservation of energy

b)

to abide by law of conservation of mass

c)

to abide by the law of fundamental equations

d)

because everything must be even for the universe to stay in balance

20.

When balancing a chemical equation, you can only change _________, you can never change _______!

a)

coefficients, subscripts

b)

subscripts, coefficients

c)

formulas, subscripts

d)

coefficients, formula units

21.

What type of reaction involves a fuel being burned in the presence of oxygen in order to produce carbon dioxide and water?

a)

single replacement

b)

synthesis

c)

double replacement

d)

combustion

22.
Two Reactants and One Product
a)
Decomposition
b)
Combination
c)
Combustion
d)
Single Replacement
23.
CxHy +O2 --> H2O + CO2
a)
Decomposition
b)
Double replacement
c)
Combustion
d)
Single Replacement
24.
Always starts with a hydrocarbon that reacts with oxygen and produces carbon dioxide and water. 
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
25.
One reactant into several products.
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
26.
One element replaces another in a compound.
a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
27.
What is the type of reaction shown at the top?
a)
Combination
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
28.
This pictures simulates what type of reaction?
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
29.
What type a reaction is taking place in this picture?
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
30.
What does (aq) mean in a chemical reaction?
a)
Ag
b)
silver
c)
aqualirious
d)
aqueous
31.
The following reaction is an example of what reaction type? 
CoCO3 → CoO + CO2
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
32.
Si + S8 --> Si2S4
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
33.
KOH + H3PO4 --> K3PO4 + H2O
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
34.
Pb(NO3)2 --> PbO + NO2 + O2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
35.
What are the products in the following chemical equation? 
2H2 + O2   -->   2H2O
a)
H2
b)
O2
c)
2H2 + O2
d)
2H2O
36.
What are always the product(s) for the combustion of a hydrocarbon?
a)
O2
b)
Acids and Bases
c)
H2O and CO2
d)
H2 and C
37.
When balancing equations what does
 -->
mean?
a)
subscript
b)
equals
c)
it is just an arrow
d)
yield
38.
What is the left part of a chemical equation called?
H2 + O → H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
39.
What is the right part of a chemical equation called?
H2 + O → H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
40.
Switching one substance for another
a)
Displacement
b)
Synthesis
c)
Decomposition
d)
Oxidation
41.
Breaking down a substance into simpler substances
a)
Displacement
b)
Synthesis
c)
Decomposition
d)
Oxidation
42.
Combining substances to form a new substance
a)
Displacement
b)
Synthesis
c)
Decomposition
d)
Oxidation
43.
Which coefficients are required to correctly balance the equation: 
C2S2 + O2 → CO2 + S2O
a)
1, 2, 3, 2
b)
2, 5, 4, 2 
c)
2, 4, 5, 2
d)
2, 3, 5, 2 
44.
Balance this equation:
 2Li + Cl2 -> LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li + Cl2 -> 2LiCl
45.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__H2 + __S --> __H2S
a)
1,1 --> 1
b)
2,2 --> 2
c)
1,2 --> 1
d)
1,2 --> 2

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