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Chemical reactions test practice

Total questions: 103

Worksheet time: 34mins

Name
Class
Date
1.

The following pattern represents which type of reaction?

A + B --> AB

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

2.

The following pattern represents which type of reaction?

AB --> A + B

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

3.

The following pattern represents which type of reaction?

A + BY --> AY + B

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

4.

The following pattern represents which type of reaction?

AX + BY --> AY + BX

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

5.

The following pattern represents which type of reaction?

Fuel + O2 --> CO2 + H2O

a)

Synthesis

b)

Combustion

c)

Single Replacement

d)

Double Replacement

6.

During a ______________________________, two reactants exchange cations or anions to yield new products. 


a)

Synthesis Reaction

b)

Decomposition Reaction

c)

Singe Replacement Reaction

d)

Double Replacement Reaction

7.

In a ______________________________, two or more elements or molecules form a single compound on the product side. 



a)

Synthesis Reaction

b)

Decomposition Reaction

c)

Singe Replacement Reaction

d)

Double Replacement Reaction

8.

During a ______________________________, one ion or atom replaces another in a compound. 




a)

Synthesis Reaction

b)

Decomposition Reaction

c)

Singe Replacement Reaction

d)

Double Replacement Reaction

9.


In a ____________________ a single compound is broken into two or more simpler substances.


a)

Synthesis Reaction

b)

Decomposition Reaction

c)

Singe Replacement Reaction

d)

Double Replacement Reaction

10.


During a ________________ a compound and oxygen react to produce heat and new products (CO2 and H2O).





a)

Combustion Reaction

b)

Decomposition Reaction

c)

Singe Replacement Reaction

d)

Double Replacement Reaction

11.

The following reaction represents which type of chemical reaction:

Mg + HF --> MgF2 + H2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

12.

The following reaction represents which type of chemical reaction:

Na2S + HCl --> NaCl + H2S

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

13.

The following reaction represents which type of chemical reaction:

H2 + Cl2 --> HCl

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

14.

The following reaction represents which type of chemical reaction:

CO2 --> C + O2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

15.

The following reaction represents which type of chemical reaction:

C4H10 + O2 --> CO2 + H2O

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Combustion

16.

Which of the following is the correct way to balance this equation?

Zn + HCl --> ZnCl2 + H2

a)

2 Zn + 2 HCl --> 2 ZnCl2 + 2 H2

b)

1 Zn + 2 HCl --> 1 ZnCl2 + 2 H2

c)

1 Zn + 2 HCl --> 1 ZnCl2 + 1 H2

d)

1 Zn + 1 HCl --> 1 ZnCl2 + 1 H2

17.

The following reaction represents which type of chemical reaction:

2 H2O --> 2 H2 + O2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

18.

The following pattern represents which type of reaction?

AB + CD --> AD + CB

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

19.

During a ______________________________, a compound breaks down into two or more simpler substances.


a)

Synthesis Reaction

b)

Decomposition Reaction

c)

Single Replacement Reaction

d)

Double Replacement Reaction

20.

The following reaction represents which type of chemical reaction:

2 Na + Cl2 --> 2 NaCl

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

21.

Which type of reaction is represented by the following equation?

2 H2O2 --> 2 H2O + O2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

22.

In a ____________________ reaction, two compounds exchange ions to form two new compounds.

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

23.

Which type of reaction is represented by the following equation?

2 KClO3 --> 2 KCl + 3 O2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

24.

The following reaction represents which type of chemical reaction:

2 H2 + O2 --> 2 H2O

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

25.

During a ______________________________, a single element replaces another element in a compound.


a)

Synthesis Reaction

b)

Decomposition Reaction

c)

Single Replacement Reaction

d)

Double Replacement Reaction

26.
What is decomposition?
a)
putting substances together
b)
breaking substances apart
c)

element displacing another element in a compound

d)

burning of a substance

27.
Two Reactants and One Product
a)
Decomposition
b)

Combination/Synthesis

c)
Combustion
d)

Single Displacement

28.
4Si   + S8   -->   2Si2S4
a)

Combination/Synthesis

b)
Decomposition
c)
Single Displacement
d)
Double Displacement
29.
Which of the following is the general formula for a decomposition reaction?
a)
A + B  → AB
b)
AB → A + B
c)
AB + C → AC + B
d)
AB + CD → AC + BD
30.
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
31.

What reaction has the following general formula:

A + B --> AB

a)

Combination/Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

e)

Combustion

32.

Why does thermal decomposition need heat energy

a)

to make bonds

b)

to break bonds

c)

to make water

d)

to work as a catalyst

33.

A combination reaction can be recognized because it has...

a)

only one product

b)

only one reactant

c)

2 or more reactants and 2 or more products

d)

the presence of a catalyst

34.
Si + S8 --> Si2S4
a)

Combination (Synthesis)

b)

Decomposition

c)

Single replacement

d)

Double replacement

35.

Which of the following is an example of a combination (synthesis) reaction?

a)

AgNO3 + NaCl → AgCl + NaNO3

b)

2H2 + O2 → 2H2O

c)

2H2O → 2H2 + O2

d)

Zn + CuSO4 → ZnSO4 + Cu

36.

What is always true about the products of a decomposition reaction?

a)

They are always elements

b)

There is only one product

c)

There are always two or more products

d)

They are always compounds

37.

Which statement best describes a combination reaction?

a)

One compound breaks down into simpler substances

b)

Two or more substances react to form a single product

c)

An element replaces another in a compound

d)

Two compounds exchange ions to form new compounds

38.

Which of the following best describes a decomposition reaction?

a)

An element replaces another in a compound

b)

Two compounds exchange ions

c)

Two substances combine to form a single product

d)

One substance splits into two or more simpler substances

39.

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

a)

Zn + CuSO4 → ZnSO4 + Cu

b)

NaOH + HCl → NaCl + H2O

c)

H2 + Cl2 → 2HCl

d)

2KClO3 → 2KCl + 3O2

40.

What is always true about the reactants in a combination (synthesis) reaction?

a)

There are two or more reactants

b)

They are always elements

c)

There is only one reactant

d)

They are always compounds

41.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
42.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
43.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
44.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
45.
Balance this 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
46.
Balance this equation-
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
47.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
48.
When the equation H2O2 --> H2O + O2 is completely balanced, the coefficient for water is 
a)
5
b)
8
c)
3
d)
4
49.
When the equation NH3 + O2 --> HNO3 + H2O is completely balanced using smallest whole numbers, the coefficient of O2 would be
a)
1
b)
2
c)
3
d)
4
50.
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. 
51.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
52.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
53.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
54.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
55.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
56.
What is the number before a chemical formula called?
Ex: 2H2 + O2 --> 2H2O
a)
Coefficient
b)
Subscript
c)
Atom
d)
Equation
57.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
58.
Is the following equation balanced?
4Fe + 3O2 --> 2Fe2O3
a)
yes
b)
no
59.
Is the following reaction balanced?
2CH3OH + 3O2 --> 2CO2 + 4H2O
a)
yes
b)
no
60.
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.
61.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
62.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
63.

Balance the equation

? Ag2O -> ? Ag + ? O2

a)

2,4,1

b)

2,3,2

c)

3,3,2

d)

it is already balanced

64.
The rate of a chemical reaction is NOT affected by which of the following:
a)
temperature
b)
concentration
c)
particle size (surface area)
d)
All of these affect reaction rates
65.
The rate of a reaction increases as temperature__________________.
a)
Decreases
b)
Increases
c)
Stays the Same
66.
Products will form faster if____________
a)
the particle size of the reactants are larger.
b)
temperature is decreased.
c)
concentration of the reactants are increased.
d)
the reaction is not stirred.
67.
A ______________ is a substance that increases the rate of a reaction without being used up during the reaction. 
a)
catalyst
b)
product
c)
reactant
d)
solute
68.
Smaller particle size allows for a _________ surface area to be exposed for the reaction.
a)
larger
b)
smaller
69.
The ___________ the surface area of the reactants, the faster the reaction rate.
a)
larger 
b)
smaller
70.
Increasing the temperature will increase the kinetic energy of particles, therefore increasing the collisions between particles.
a)
false
b)
true
71.
Usually lowering the temperature will slow down a reaction.
a)
false
b)
true
72.
Increasing the concentration of the reactants will slow down the reaction.
a)
false 
b)
true
73.

________ is the measure of how much area of an

object is exposed.

a)

Surface Area

b)

Catalyst

c)

Temperature

d)

Concentration

74.

Grains of sugar have a greater _______ than a solid cube of

sugar of the same mass, and therefore will dissolve quicker in water.

a)

Surface Area

b)

Catalyst

c)

Temperature

d)

Concentratrion

75.

Pick the TWO (2) options that will INCREASE the rate of a reaction.

a)

Reducing Heat

b)

Adding Catalyst

c)

Adding Heat

d)

Removing Catalyst

76.

Which of the following will lower the rate

of reaction?

a)

adding an enzyme to the reaction

b)

decreasing the temperature from 40°C to

10°C

c)

breaking a chunk of calcium up into

smaller pieces

d)

increasing the amount of solute

dissolved in a solution

77.

Which factors affect the rate of a reaction? (select all that apply)

a)

temperature

b)

concentration

c)

size

d)

pressure

e)

catalyst

78.

Increase in temperature causes the particles to

a)

slow down

b)

move faster

c)

stay apart from each other

d)

move in the correct order

79.

Why does a higher concentration increase the rate of reaction?

a)

it increases the amount of reactants

b)

it lowers the activation energy

c)

it increases the energy of reactant particles

d)

it increases the frequency of collision

80.

Why does a higher temperature increase the rate of a reaction?

a)

It increases both the frequency collision and energy of reactant particles

b)

It only increases the frequency of collision

c)

It only increases the energy of reactant particles

d)

It reduces the activation energy of the reaction

81.
What is the rate of reaction?
a)
How fast a reaction is 
b)
How big a reaction is
c)
How loud a reaction is
d)
How much gas a reaction produces
82.

Increasing pressure causes the reacting particles

a)

to bond together

b)

to repel from each other

c)

gain more kinetic energy

d)

to move closer together

83.

Increasing the temperature gives particles more __________.

a)

time

b)

energy

c)

space

d)

frequency

84.
Which of the following slows down the rate of a chemical reaction?
a)
Place the reactants in hot water
b)
Place the products in ice bath
c)
Place the reactants in a ice bath
d)
Keep stirring the reactants with a stirring rod
85.
What makes an effective collision?
a)
When molecules collide.
b)
When molecules collide with the proper orientation.
c)
When molecules collide with proper orientation and enough kinetic energy.
d)
High Temperature.
86.

The major theory of reaction rate is called

a)

Collision theory

b)

Crash theory

c)

Newton's laws

d)

Thermodynamics

87.

When surface area is decreased the rate of reaction...

a)

Decreases, because there are LESS possible sites for correct collisions

b)

Increases, because there are LESS possible sites for correct collisions

c)

Decreases, because there are MORE possible sites for correct collisions

d)

Increases, because there are MORE possible sites for correct collisions

88.

The rate of a reaction is measured by how fast a reactant is used up or how fast a _______is formed.

a)

product

b)

catalyst

89.
Why don't all collisions between particles cause a reaction?
a)
the particles also need to collide with a catalyst
b)
not all the particles collide with enough energy
c)
not all the particles collide at a high enough temperature
d)
the particles need to collide with each other twice
90.
Increasing the concentration increases the speed of reaction by
a)
lowering activation energy
b)
increasing collisions
c)
speeding up the reactants
d)
exposing more reactant
91.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
92.
In a chemical reaction, everything to the right of the arrow is called ______________.
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
93.
What are Chemical Reactions?
a)
It's when you mix substances.
b)
a process in which atoms rearrange to form new substances
c)
When something bubbles.
d)
letter and numbers showing the types and number of atoms
94.
Which of the following describes a precipitate?
a)
a liquid forms when a block of metal is heated
b)
a solid forms when one liquid is poured into another
c)
a gas forms when a solid is placed in a liquid
d)
bubbles form when an acid is poured on a rock
95.

The _____ describes the atoms in a compound.

a)

Chemical Equation

b)

Chemical Formula

c)

Chemical Symbol

d)

Coefficient

96.

Which is the correct formula for:

3 Hydrogen (H)

1 Sulfur (S)

4 Oxygen (O)

a)

H3SO4

b)

HSO4

c)

H4S3O

d)

H2O

97.

How many TOTAL atoms are in:

H2SO4

a)

6

b)

5

c)

7

d)

3

98.

How many nitrogen atoms are there?

a)

4

b)

8

c)

10

d)

20

99.
How many oxygen atoms in total are in 
CuSO4⋅5H2O
a)
1
b)
2
c)
5
d)
9
100.
How many oxygen atoms in 
Mg(NO3)2
a)
1
b)
2
c)
3
d)
6
101.

4CF2Cl2

a)

C = 4, F = 4, Cl = 2

b)

C = 1, F = 8, Cl = 8

c)

C = 4, F = 8, Cl = 8

d)

C = 1, F = 4, Cl = 8

102.

The Law of Conservation of Mass says that matter can neither be __________ or __________.

a)

created; destroyed

b)

recycled; renewed

c)

subtracted; added

d)

joined; separated

103.
What does the principle of conservation of mass mean?
a)
The total mass of the reactants is more than the products
b)
Matter is not created or destroyed
c)
The total mass of the reactants is less than the products

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