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BALANCING, EXOTHERMIC AND ENDOTHERMIC REACTIONS

Total questions: 20

Worksheet time: 30mins

Name
Class
Date
1.

Balance this equation:

H2 + Cl2 ---> HCl

a)

It is balanced.

b)

H2 + Cl2 ---> 2HCl

c)

3H2 + Cl2 ---> 6HCl

d)

H2 + 3Cl2 ---> 6HCl

2.

Balance this equation:

HgO ---> 2Hg + O2

a)

It is balanced.

b)

2HgO ---> 2Hg + O2

c)

2HgO ---> Hg + O2

d)

HgO ---> Hg + 2O2

3.
What is the Law of Conservation of Mass?
a)
It states that no matter can be created or destroyed.
b)
It states that no energy can be created or destroyed.
c)
It states that matter can be created or destroyed.
d)
It states that no sound can be created or destroyed.
4.

Determine whether the following equations is balanced or unbalanced. S8 + O2 ---> 8SO3

a)

Balanced

b)

Unbalanced

5.

Which coefficients would balance this chemical equation? _Fe2O3 ---> _Fe + _O2

a)

2,1,2

b)

2,4,3

c)

1,1,1

d)

1,3,2

6.

Which of the following equations is balanced?

a)

P4 + 3O2 ---> 2P2O3

b)

N4 + 3F2 ---> 2NF3

c)

2LiF + Br2 ---> 2LiBr + F4

7.
The substances listed on the left side of a chemical equation are the
a)
Products
b)
Coefficients
c)
Precipitates
d)
Reactants
8.
In balancing chemical equations, we change
a)
Coefficients
b)
Subscripts
c)
Both can be changed
d)
None can be changed
9.

If 100 grams of vinegar and 5 grams of baking soda are poured in a container, a small amount of gas will be produced. What will the final mass of the products be if the gas is trapped in the container?

a)

100 g

b)

104 g

c)

105 g

d)

110 g

10.

Balance the following equation:

___ Mg+ ___ O2→___ MgO

a)

1, 1, 3

b)

2, 1, 2

c)

1, 2, 1

d)

2, 2, 2

11.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
12.
In an exothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released
13.
In an endothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released 
14.
The Thermite reaction is used to weld railway lines. Is it an endothermic or exothermic reaction?
a)
Exothermic
b)
Endothermic
15.
What type of reaction occurs in a hand warmer
a)
exothermic
b)
endothermic
16.
A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true? 
a)
The temperature changed 
b)
It is an endothermic reaction
c)
It is an exothermic reaction 
d)
Two of the answers are correct 
17.
Is photosynthesis an exothermic or endothermic reaction?
a)
Endothermic
b)
Exothermic
c)
Neither
18.

Fireworks are an example of

a)

exothermic

b)

endothermic

c)

both

d)

none

19.

Energy is released during the process of cellular respiration. This is an example of an ___________ reaction.

a)

endothermic

b)

exothermic

20.
In an endothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released 

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