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Chemical Reactions Review

Total questions: 50

Worksheet time: 40mins

Name
Class
Date
1.

In a combustion reaction one of the products is

a)

a hydrocarbon

b)

carbon dioxide

c)

oxygen

d)

nitrogen

2.
What must be balanced in a chemical reaction?
a)
moles
b)
molecules
c)
coefficients
d)
atoms
3.
When one compound is broken up into multiple products, that type of reaction is...
a)
combination
b)
decomposition
c)
single replacement
d)
double replacement
4.
Name one diatomic molecule
a)
hydrogen
b)
neon
c)
carbon
d)
sodium
5.
Which of the following indicates a chemical change?
a)
Change in state of matter
b)
Temperature change
c)
Change in size 
d)
Change in shape
6.

Fizzing, foaming, and burning are all examples of

a)

physical change

b)

chemical change

7.

The formation of a solid when two liquids combine is called?

a)

Solidification

b)

Freezing

c)

Precipitate

d)

Solubility

8.

Which of the following could indicate that a chemical change took place?

a)

Change in color

b)

Production of Energy

c)

Formation of Gas

d)

All are correct

9.

Ms. Bristol measured the mass of a closed beaker containing several ice cubes. The mass was 100g. An hour later, after the ice cubes had melted, Ms. Bristol measured the mass of the beaker again. What was the mass of the beaker of water the second time?

a)

50 g

b)

75 g

c)

100 g

d)

150 g

10.

According to the Law of Conservation of Mass,

a)

matter is always created in a chemical reaction

b)

matter is always destroyed in a chemical reaction

c)

matter is created and then destroyed in a chemical reaction

d)

matter is not created or destroyed in a chemical reaction

11.

Substances that start a chemical reaction are known as the

a)

reactants

b)

products

c)

chemicals

d)

substances

12.

Substances created, or made, during a chemical reaction are known as the

a)

reactants

b)

products

c)

chemicals

d)

substances

13.

The law of conservation of mass can be demonstrated by a chemical reaction. Which of the following models of a chemical reaction best represents the law of conservation of mass?

a)
b)
c)
d)
14.

In the diagram, letter D represents a

a)

subscript

b)

coefficient

c)

product

d)

equation

15.

In the diagram, letter E represents a

a)

subscript

b)

coefficient

c)

product

d)

equation

16.

Which is the product in the reaction shown?

a)

Al2O3

b)

Al

c)

O2

17.
Which are the reactants in the equation shown?
a)
H2O and CO2
b)
O2 and CH4
18.
What describes the reactant atoms in the equation shown?
a)
Al= 4, O= 3
b)
Al= 1, O= 1
c)
Al= 4, O= 6
d)
Al= 6, O= 1
19.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
20.
How many elements are in C6H12O6?
a)
1
b)
3
c)
12
d)
24
21.
This appears on the left side of a chemical formula, and represents how many molecules there are. 
a)
An Atom
b)
The Subscript
c)
A Molecule
d)
The Coefficient
22.
This is used to represent the number of each atom being represented. 
a)
A Exponent
b)
The Coefficient
c)
A Molecule
d)
The Subscript
23.

How many molecules of KNO3 are shown?

a)

1

b)

2

c)

3

d)

4

24.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
25.
In an endothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released 
26.
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.
27.
Balance this equation...
HgO --> Hg + O2
a)
It is balanced 
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
d)
I don't know...Oh well!
28.

Which reaction type is the following:

C5H10 + O2 --> CO2 + H2O

a)

Decomposition

b)

Synthesis

c)

Complete Combustion

d)

Double Replacement

29.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
30.
Which of the following reactions is balanced?
a)
2CH4 + O2 -> CO2 + H2O
b)
CH4 + 2O2 -> CO2 + H2O
c)
CH4 + 2O2 -> CO2 + 2H2O
d)
None of the chemical equations are balanced.
31.
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2
32.

P4 + 3 O2 ----> 2 P2O3

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

33.

MgCl2 + Li2CO3 ----> MgCO3 + 2 LiCl

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

34.

CaCO3 ----> CaO + CO2

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

35.

Pb + FeSO4 ----> PbSO4 + Fe

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

36.

1 Li3N + 3 NH4NO3 ----> 3 LiNO3 + 1 (NH4)3N

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

37.

2 NH3+ 1 H2SO4 ----> 1 (NH4)2SO4

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

38.

2 NaBr + 1 Ca(OH)2 ----> 1 CaBr2 + 2 NaOH

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

39.

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

a)

Synthesis (combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

40.
Sydnee mixes a solution of baking soda and water. The initial temperature of the solution is 22⁰C. She adds 10mL of vinegar and takes the temperature again. The final temperature is 17⁰C. Which of the following is true?
a)
The reaction is exothermic
b)
The reaction is endothermic
c)
ΔH is negative
d)
The reaction lost heat to the environment.
41.

If a chemical substance has been dissolved in water, what symbol would be used to represent the solution?

a)

(s)

b)

(g)

c)

(l)

d)

(aq)

42.

Which of the following is TRUE about ionic compounds?

a)

They have low melting and boiling points.

b)

They can conduct electricity in the solid state.

c)

They are stronger than covalent bonds.

d)

They are usually formed from 2 metals.

43.
What will be the chemical formula for 
K and N
a)
K3N
b)
KN
c)
KN3
d)
K2N
44.
__(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
45.

How many atoms in all are in a molecule of serotonin?

C10H12N2O

a)
22
b)
24
c)
25
d)
4
46.
What is one way to increase the speed of a reaction?
a)
Increase temperature 
b)
You cannot speed up a reaction
c)
Lower temperature
d)
Add an inhibitor
47.

Balance the following:

__ C7H14 + __ O2 → __ CO2 + __ H2O

a)

1, 14, 7, 7

b)

1, 13, 7, 7

c)

2, 21, 14, 14

d)

2, 19, 14, 14

48.

What does the above symbol mean

a)

a catalyst has been added to a reaction

b)

heat has been added to a reaction

c)

it is an aqueous solution

d)

it is a reversible reaction

49.

When one element replaces another in a compound.

a)

combustion

b)

synthesis

c)

single replacement

d)

double replacement

50.

When H₂O₂ is left out it will decompose into water and carbon dioxide. KMnO₄ can be used to speed up this reaction. KMnO₄ is a ___________.

a)

Product

b)

Reactant

c)

Inhibitor

d)

Catalyst

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