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Chemical Reactions Review

Total questions: 38

Worksheet time: 23mins

Name
Class
Date
1.

Is this equation balanced? 
(Are there the same amount of H and O atoms on both sides of the equation?)

   H2O2→ H2O + O2H_2O_2\rightarrow\ H_2O\ +\ O_2  

a)

Yes

b)

No

2.

In the diagram, letter D represents a

a)

subscript

b)

coefficient

c)

product

d)

equation

3.

In the diagram, letter E represents a

a)

subscript

b)

coefficient

c)

product

d)

equation

4.
Which are the reactants in the equation shown?
a)
H2O and CO2
b)
O2 and CH4
5.

Which is the product in the reaction shown?

a)

Al2O3

b)

Al

c)

O2

6.
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
7.

How does the mass of products compare to the mass of reactants in a chemical reaction?

a)

reactants = products

b)

reactants > products

c)

reactants < products

8.

In the reaction shown below, 12 grams of AB break down into 8 grams of product A and an unknown amount of product B.


Using the law of conservation of mass, what will the mass of product B be?

a)

4 grams

b)

8 grams

c)

12 grams

d)

20 grams

9.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
10.
How many elements are in C6H12O6?
a)
1
b)
3
c)
12
d)
24
11.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
12.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
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.
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
15.
This is used to represent the number of each atom being represented. 
a)
A Exponent
b)
The Coefficient
c)
A Molecule
d)
The Subscript
16.

How many Oxygen (O) atoms are in one molecule of 2C2HO8Cl2

a)

2

b)

16

c)

8

d)

5

17.

How many molecules of KNO3 are shown?

a)

1

b)

2

c)

3

d)

4

18.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
19.

The process in which one or more substances are changed into new substances with different chemical and physical properties is called a _____

a)

chemical equation

b)

chemical change

c)

physical change

20.

Choose the correct coefficients that balance the following equation.

Ca + N2 --->Ca3N2

a)

1,3,3

b)

2,3,1

c)

3,1,1

d)

4,1,3

21.

What are the NEW substances produced in a chemical reaction called?

a)

reactants

b)

products

c)

polyatomic ions

d)

solutions

22.

Identify the reactants in this chemical reaction.

Ca + F2--> CaF2

a)

Ca

b)

F2

c)

Ca + F2

d)

CaF2

23.

Balance the following equation.

Al + S--> Al2S3

a)

2,2,1

b)

2,4,1

c)

2,3,1

d)

3,1,1

24.

Identify the product(s) in this chemical reaction.

Ca + F2 --> CaF2

a)

Ca

b)

F2

c)

CaF2

d)

Ca and F2

25.

Symbol, Formula, or Equation: C + O2 --> CO2

a)

Symbol

b)

Formula

c)

Equation

26.

Symbol, Formula, or Equation: Fe

a)

Symbol

b)

Formula

c)

Equation

27.

Symbol, Formula, or Equation: CaCo3

a)

Symbol

b)

Formula

c)

Equation

28.

True or False: Matter is not created or destroyed during a chemical reaction.

a)

True

b)

False

29.

A number written slightly below and to the right of a chemical symbol that shows how many atoms of an element are in a compound.

a)

Compound

b)

Coefficient

c)

Subscript

d)

Chemical Formula

30.

characteristics used to describe a substance

a)

Properties

b)

State

c)

Precipitate

d)

Reaction

31.

A solid that forms from a solution during a chemical reaction.

a)

Chemical Property

b)

Physical Property

c)

Chemical Reaction

d)

Precipitate

32.

a way to describe a chemical reaction using chemical formulas and other symbols

a)

Chemical Equation

b)

Reactant

c)

Product

d)

Conserve

33.

What can happen when the bonds between atoms are formed or broken?

a)

light is released

b)

heat is released

c)

gas is produced

d)

all of the above

34.

In a chemical reaction:

a)

The atoms of the reactants always stay together to form the products

b)

The atoms of the reactants unbond, rearrange, and then rebond to form the products

c)

New atoms are formed which combine to make the products

d)

Some atoms disappear while others multiply to form the products

35.

If the reactants on the left side of a chemical equation are C3H8 + 5O2, the products should be

a)

4CO2 + 3H2O

b)

3CO2 + 4H2O

c)

2CO2 + 3H2O

d)

3CO + 4H2O

36.

If two substances react and the temperature of the mixture decreases, the reaction is

a)

Exothermic

b)

Endothermic

c)

Idon'tknowthermic

d)

Nocluethermic

37.

Is the equation balanced?


SnO2 + 2 H2 → Sn + 2 H2O

a)

Yes

b)

No

38.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease

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