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Chemical Reactions Test Review

Total questions: 45

Worksheet time: 58mins

Name
Class
Date
1.

What type of reaction is this:

4Si + S8 --> 2Si2S4

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Double displacement

2.

What type of reaction is this:

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

a)

Synthesis

b)

Decomposition

c)

Single diplacement

d)

Double displacement

3.

What type of reaction is this:

3KOH + H3PO4 --> K3PO4 + 3H2O

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Double displacement

4.

What type of reaction is this:

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

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Combustion

5.

What type of reaction is this:

3Mg + N2 --> Mg3N2

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Combustion

6.

What type of reaction is this:

2NO2 --> N2 + 2O2

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Combustion

7.

What type of reaction is this:

2Fe + 3H2SO4 --> Fe2(SO4)3 + 2H2

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Combustion

8.
Which chemical reaction switches 2 elements?
a)
Double Replacement
b)
Single Replacement
c)
Combustion
d)
Decomposition
9.
AB + CD = AD + CB
a)
Double Replacement
b)
Single Replacement
c)
Combustion
d)
Decomposition
10.
In a chemical equation, is it true that -
a)
the reactant side and product side can have different numbers of atoms for each element
b)
there can be different elements on the reactant side and the product side
c)
an element or compound must be accompanied by a phase change
d)
the coefficients indicate the number of molecules of each reactant used and the number of molecules of each product made
11.
The reactants are on the left side of the chemical equation.
a)
True
b)
False
12.
Two clear colorless solutions were combined.
The student observed that the temperature changed from 25 •C to 23 •C when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?
a)
One of the original compounds came out of solution
b)
The solutions reacted chemically
c)
Some of the water froze into ice crystals
d)
Rapid evaporation of water occurred, leaving a solid
13.
In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
a)
H3PO4
b)
H2SO4
c)
HCIO3
d)
H20
14.
All of the following reactions are correctly balanced except-
a)
A
b)
B
c)
C
d)
D
15.

In a ___________change, a substance changes into a different substance.

a)

Physical

b)

Chemical

16.

How many F atoms are in this compound?

6MgF2

a)

2

b)

6

c)

8

d)

12

17.
___C3H8 +___O2 --> ___CO2 + ___H2O
a)
1,5,3,4
b)
2,10,6,8
c)
already balanced
d)
1,5,5,4
18.
__Al + __Fe3N2 -->__AlN + __Fe
a)
already balanced
b)
4,2,4,6
c)
2,1,2,3
d)
1,2,1,3
19.
__Na + __Cl2 --> __NaCl
a)
1,1,2
b)
2,1,2
c)
2,1,1
d)
already balanced
20.
__H2O2 --> __H2O + __O2
a)
already balanced
b)
2,1,1
c)
2,2,1
d)
2,1,2
21.
__H2O + __CO2 --> __C7H8 + __O2
a)
4,7,1,9
b)
4,7,1,7
c)
2,3,1,3
d)
already balanced
22.
__(NH4)3PO4 + __Pb(NO3)4 --> __Pb3(PO4)4 + __NH4NO3
a)
2,1,1,6
b)
1,2,2,3
c)
4,3,1,12
d)
4,2,1,12
23.

A material used to decrease the rate of a chemical reaction...

a)

Fuel

b)

Enzyme

c)

Catalyst

d)

Inhibitor

24.

A shorter way to show a chemical reaction, using symbols instead of words, is called a

a)

symbol

b)

subscript

c)

Chemical Equation

d)

chemical formula

25.

which two of these are opposites?

a)

precipitate and synthesis reaction

b)

single replacement and double replacement

c)

decomposition and single replacement reaction

d)

synthesis and decomposition reaction

26.

A chemical reaction that absorbs energy in the form of heat is described as ...

a)

unbalanced

b)

endothermic

c)

exothermic

d)

combustion

27.

The minimum amount of energy needed to start a reaction is the ....

a)

endothermic energy

b)

chemical energy

c)

activation energy

d)

exothermic energy

28.

What tells us how many molecules there are in a chemical equation?

a)

coefficient

b)

yield

c)

subscript

d)

elements

29.

A chemical reaction that releases energy in the form of heat is an _____________ reaction.

a)

endothermic

b)

exothermic

30.

Why do products have different properties than the reactants?

a)

They have the same properties

b)

atoms are destroyed to make new substances

c)

atoms are gained to make new substances

d)

atoms rearrange to create a new substance

31.
An ending substance that is made during a chemical reaction is called
a)
Reactant
b)
Product
c)
Atom
d)
Molecule
32.
The number of atoms on one side of a chemical equation is equal to
a)
a molecule of a substance
b)
the amount of gas released during a chemical reaction
c)
the number of atoms on the other side of a chemical equation
d)
all of the matter that exists in the universe
33.
How many hydrogen atoms are in this chemical formula: 
a)
4 hydrogen atoms
b)
1 hydrogen atom
c)
2 hydrogen atoms
d)
3 hydrogen atoms
34.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
35.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
d)
1
36.
Which of the following is true about the atoms involved in a chemical reaction?
a)
The same number of each type of atom will be present before and after a chemical reaction
b)
Some of the atoms present before the reaction will be lost during a chemical reaction
c)
Some of the atoms will be hcanged into a different type of atom by a chemical reaction
d)
During a chemical reaction, atoms will always be combined into much larger molecules
37.
How do you know Baking Soda and Vinegar reaction was endothermic?
a)
The temperature increases (goes up)
b)
The temperature descreases (goes down)
c)
The temperature stays the same
38.
Which of the above chemical reactions shows an exothermic reaction?
a)
Hydrogen Peroxide and Yeast
b)
Baking Soda and Vinegar 
c)
Iodine and Liquid Starch
39.

What is a rapid reaction between oxygen and fuel?

a)

endothermic

b)

exothermic

c)

combustion

d)

redox reaction

40.

What is a number placed in front of a chemical formula in a chemical equation?

a)

multiplier

b)

coefficient

c)

subscript

d)

least common multiple

41.

What are numbers written below a symbol that show the numbers of atoms of an element present in a compound?

a)

chemical formula

b)

chemical equations

c)

coefficient

d)

subscript

42.

What is it when 2 or more substances combine to make a more complex substance?

a)

synthesis reaction

b)

decomposition reaction

c)

replacement reaction

d)

double replacement reaction

43.

What is a reaction in which a compound is broken down into simpler substances?

a)

synthesis reaction

b)

decomposition reaction

c)

replacement reaction

d)

double replacement reaction

44.
How many Oxygen (O) atoms are in 2C2HO8Cl2
a)
2
b)
16
c)
8
d)
5
45.
__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

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