wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

Physical Science Chapter 7 Review

Total questions: 137

Worksheet time: 7hrs 51mins

Name
Class
Date
1.

Which of the following changes will decrease the rate of a chemical reaction?

a)

increasing the temperature

b)

grinding a reactant into a fine powder

c)

stirring the reaction mixture

d)

decreasing the concentration of one of the reactants

2.

A reaction rate is the rate at which reactants change into products over time

a)

True

b)

false

3.

In a chemical reaction that is at equilibrium, which of the following is true?

a)

All of the reactants have been converted to products

b)

The reaction stops even though some reactants remain

c)

Forward and reverse reactions occur at the same rate

d)

All of the products are gases

4.

In the chemical reaction below, how could you shift the equilibrium toward water?

2H2 (g) + O2 (g) <--> 2H2O (g) + heat

a)

increase the temperature

b)

increase the pressure

c)

decrease the amount of oxygen

d)

add steam to the mixture

5.

During a chemical reaction, an input of energy is always required to

a)

break chemical bonds in a molecule

b)

build chemical bonds as a molecule forms

c)

separate products from reactants

d)

change reactants to the liquid phase so they can react

6.

In an exothermic reaction, the total chemical energy of the products added to the energy released by the reactions is

a)

less than the energy of the reactants

b)

equal to the chemical energy of the reactants

c)

greater than the chemical energy of the reactants

d)

not related to the chemical energy of the reactants

7.

Combustion is always an exothermic reaction

a)

true

b)

false

8.

Which of the following is a balanced chemical equation for the reaction of aluminum and ammonium perchlorate?

a)

Al + NH4ClO4 —› Al2O3 + NH4Cl

b)

4Al + 3NH4ClO4 —› 4Al2O3  + 3NH4Cl

c)

8Al + NH4ClO4 —› 4Al2O3 + NH4Cl

d)

8Al + 3NH4ClO4 —› 4Al2O3 + 3NH4Cl

9.

How many moles of NaCl (molar mass = 58.5) are there in a 10-gram sample?

a)

58 mol

b)

5.8 mol

c)

0.17 mol

d)

0.28 mol

10.

In the reaction shown below, how many grams of hydrogen are produced when 10 moles of potassium react with water?

2K + 2H2O —› 2KOH + H2

a)

2.5 g

b)

5 g

c)

10 g

d)

20 g

11.

In the chemical equation below, the reactants are carbon dioxide and water.

CH4 + 2O2 —› CO2  +2H2O

a)

true

b)

false

12.

Which of these statements best describes a double-replacement reaction?

a)

Two different compounds exchange positive ions and form two new compounds

b)

An element takes the place of another element in a compound

c)

One compound breaks down into two or more simpler substances

d)

Two or more substances react to form a single substance

13.

Which of the following statements about oxidation-reduction reactions is true?

a)

Oxidation-reduction reactions always involve a transfer of protons between atoms

b)

Oxidation is the process in which electrons are gained

c)

Oxidation and reduction always occur together

d)

Oxidation-reduction reactions always involve oxygen as one of the reactants

14.

What coefficients would balance the following equation?

__Al + __O2 → __Al2O3

a)

2Al + 3O2 → Al2O3

b)

2Al + 3O2 → 2Al2O3

c)

3Al + 3O2 → 2Al2O3

d)

4Al + 3O2 → 2Al2O3

15.

What coefficients would balance the following equation?

__C2H6 + __O2 → __CO2 + __H2O

a)

C2H6 + 5O2 → 2CO2 + 3H2O

b)

2C2H6 + 5O2 → 4CO2 + 6H2O

c)

2C2H6 + 7O2 → 4CO2 + 6H2O

d)

2C2H6 + 10O2 → 4CO2 + 6H2O

16.

Classify the chemical reaction shown here:

Mg + H2SO4 → MgSO4 + H2

a)

Combination

b)

Single replacement

c)

Decomposition

d)

Double replacement

17.

Classify the chemical reaction shown here:

CaCO3 → CaO + CO2

a)

Combination

b)

Single replacement

c)

Decomposition

d)

Double replacement

18.

Which of the following is an example of a double replacement reaction?

a)

3Fe + 2O2 → Fe3O4

b)

BaCl2 + K2CO3 → BaCO3 + 2KCl

c)

NiCO3 → NiO + CO2

d)

Cl2 + 2NaBr → 2NaCl + Br2

19.
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. 
20.
Is this balanced?...
Fe + S --> FeS
a)
YES!
b)
NO!
21.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
22.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
23.
Balance this equation-
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
24.
Balance this equation.
_CH4 + _O2 --> _CO2 + _H2O
a)
1,2,1,1
b)
2,1,2,1
c)
1,2,1,2
d)
0,2,0,2
25.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
26.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
27.
KNO3 --> KNO2 + O2
What coefficients are needed to balance the reaction?
a)
2, 2, 1
b)
2, 3, 2
c)
1, 2, 2
d)
1, 3, 1
28.
Which side of a chemical equation is the product side?
a)
Left (before the arrow)
b)
Right (after the arrow)
29.
Which side of a chemical equation is the reactant side?
a)
Left (before the arrow)
b)
Right (after the arrow)
30.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
31.
What is the arrow in a chemical equation...
H2 + O --> H2O
a)
Reactants
b)
Products 
c)
Produces
d)
Chemical Equation 
32.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
33.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
34.
How many Elements are in the compound C2H8O ?
a)
2
b)
1
c)
3
d)
0
35.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
36.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
37.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
38.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
39.
The blue numbers in the image below represent ________
a)
Charges
b)
coefficients
c)
subscripts
d)
none of the answers are correct
40.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
6
c)
8
d)
24
41.
Balance this equation:
P4+O2  -->  P2O3
a)
3 P4+ O2 --> 2 P2O3
b)
 P4+ O2 --> 2 P2O3
c)
 P4+ 3 O2 --> 2 P2O3
d)
 P4+ 2 O2 --> 3 P2O3
42.

Fill in the blanks with coefficient:

PCl5+_ H2O→_ HCl+H3PO4

a)

4, 5

b)

1, 6

c)

3, 8

d)

2,2

43.

Which equation is balanced?

a)

PbO2 + 2H2--> H2SO4

b)

SO2 + H20 --> H2SO4

c)

2Na + 2H2O --> 2NaOH + H2

d)

2Na + 2H2O --> 2NaOH + H

44.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
45.
Which side of a chemical equation is the reactant side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
46.
Which side of a chemical equation os the product side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
47.
Balance this equation.
_SnO2 +_H2-->_Sn +_H2O
a)
1,1,2,1
b)
1,2,1,1
c)
1,2,1,2
d)
1,2,2,1
48.
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
49.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
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.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
52.
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
53.
Balance this equation.
_CH4 + _O2 --> _CO2 + _H2O
a)
1,2,1,1
b)
2,1,2,1
c)
1,2,1,2
d)
0,2,0,2
54.
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
55.
When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced
a)
charge
b)
subscript
c)
random number
d)
coefficient
56.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
57.

The two sides of a chemical equation are called?

a)

Reactants (left) and Products (right)

b)

Ingredients (left) and Product (right)

c)

Cations and Anions

d)

Reactants (left) and Results (right)

58.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
59.

PCl5 + ___ H2O → ___ HCl + H3PO4

a)

4, 5

b)

1, 6

c)

3, 8

d)

2,2

60.

__ Al + __ FeO → Al2O2 + __ Fe

a)

1, 1, 2

b)

2,1,2

c)

2, 2, 2

d)

2,4,2

61.
 Mg  +  ___ HCl  →   MgCl2  +   H2
a)
1
b)
2
c)
3
d)
4
62.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
63.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
64.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__Na + __H2O --> __NaOH + __H2
a)
2,2 --> 2,1
b)
4,4 --> 4,1
c)
1,2 --> 2,4
d)
1,2 --> 2,1
65.

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?

__Ca + __H2O --> __Ca(OH)2 + __H2

a)
2,1 --> 2,1
b)
1,2 --> 1,1
c)
1,2 --> 2,4
d)
1,2 --> 2,1
66.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CO + __Fe2O3--> __Fe + __CO2
a)
3,1 --> 2,3
b)
3,2 --> 1,1
c)
3,2 --> 2,4
d)
3,2 --> 2,1
67.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CH4 + __O2 --> __CO2+ __H2O
a)
2,1 --> 2,1
b)
1,2 --> 1,1
c)
1,2 --> 1,2
d)
1,2 --> 2,1
68.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__AgNO3 + __H2S --> __Ag2S+ __HNO3
a)
2,1 --> 1,2
b)
1,2 --> 1,1
c)
1,2 --> 1,2
d)
1,2 --> 2,1
69.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__H2 + __S --> __H2S
a)
1,1 --> 1
b)
2,2 --> 2
c)
1,2 --> 1
d)
1,2 --> 2
70.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__H2SO3 + __KOH--> __H2O+ __K2SO3
a)
2,1 --> 2,1
b)
1,2 --> 1,1
c)
1,2 --> 1,2
d)
1,2 --> 2,1
71.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__Al + __O2--> __Al2O3
a)
4,1 --> 2
b)
4,3 --> 4
c)
3,4 --> 1
d)
4,3 --> 2
72.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__MnO2 + __HCl --> __MnCl2 + __H2O __Cl2
a)
4,1 --> 2,1,2
b)
1,2 --> 1,1,4
c)
1,4 --> 1,2,1
d)
1,4 --> 2,2,1
73.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__FeCl3 + __Ca(OH)2 --> __Fe(OH)3 + __CaCl2
a)
4,3--> 2,1
b)
3,2 --> 3,1
c)
2,3 --> 2,2
d)
2,3 --> 2,3
74.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
75.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
76.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
77.
Balance this equation
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
78.
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. 
79.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
80.
What is the arrow in a chemical equation...
H2 + O --> H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
81.
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
82.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
83.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
84.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
85.
When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced
a)
charge
b)
subscript
c)
random number
d)
coefficient
86.
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
87.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
88.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
89.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed.
b)
The total mass of the reactants is greater than the total mass of the products.
c)
The total mass of the reactants is less than the total mass of the products.
d)
Matter is not changed.
90.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CH4 + __O2 --> __CO2+ __H2O
a)
2,1 --> 2,1
b)
1,2 --> 1,1
c)
1,2 --> 1,2
d)
1,2 --> 2,1
91.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__AgNO3 + __H2S --> __Ag2S+ __HNO3
a)
2,1 --> 1,2
b)
1,2 --> 1,1
c)
1,2 --> 1,2
d)
1,2 --> 2,1
92.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__H2 + __S --> __H2S
a)
1,1 --> 1
b)
2,2 --> 2
c)
1,2 --> 1
d)
1,2 --> 2
93.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__H2SO3 + __KOH--> __H2O+ __K2SO3
a)
2,1 --> 2,1
b)
1,2 --> 1,1
c)
1,2 --> 1,2
d)
1,2 --> 2,1
94.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__Al + __O2--> __Al2O3
a)
4,1 --> 2
b)
4,3 --> 4
c)
3,4 --> 1
d)
4,3 --> 2
95.

What is the right part of a chemical equation called...

H2 + O2 --> H2O

a)

Reactants

b)

Products

c)

Yields

d)

Chemical Equation

96.

What is the arrow in a chemical equation...

H2 + O2 --> H2O

a)

Reactants

b)

Products

c)

Yields

d)

Chemical Equation

97.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
98.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
99.
2H2 + O2 --------> 2H2O What  are the reactants?
a)
----->
b)
2H2O
c)
2H2 +O2
100.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
101.
Number of C's in 2Na₂CO₃
a)
1
b)
2
c)
3
d)
5
102.
The number of Na's in Na₂CO₃
a)
1
b)
2
c)
3
d)
6
103.
How many Elements are in the compound C2H8O ?
a)
2
b)
1
c)
3
d)
0
104.
How many total atoms are in the compound C2H8O ?
a)
11
b)
2
c)
8
d)
1
105.
Number of N in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
106.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
107.
How many atoms of Hydrogen are in this compound
a)
1
b)
2
c)
3
d)
4
108.
How many atoms of Oxygen are in this compound?
a)
1
b)
2
c)
3
d)
4
109.
How many TOTAL atoms are in this compound?
H2C3O4N5
a)
5
b)
14
c)
15
d)
19
110.
A subscript is the small number below a(n) ________ that tells the number of _______ of that element.
a)
element symbol; atoms
b)
atom; element symbol
c)
subscript; protons
d)
compound; elements
111.

In the formula 3CO2 , what does the 3 represent?

a)

the subscript

b)

the atomic number

c)

the coefficient

d)

the atomic mass

112.
How many total atoms are in the compound C2H8O ?
a)
11
b)
2
c)
8
d)
1
113.

The law that states the total amount of matter cannot be created nor destroyed?

a)

law of electricity

b)

law of destruction of mass

c)

Law of conservation of matter

d)

law of relative matter

114.

These are the compounds you have at the beginning of the reaction

a)

products

b)

reactants

115.

A short easy way to show a chemical reaction

a)

chemical notation

b)

chemical equation

c)

chemical reaction

d)

chemical chart

116.

Indicates how many of an atom of a particular element are present.

a)

subscript

b)

mass number

c)

coefficient

d)

atomic number

117.

Indicates the total number of compounds/molecules present.

a)

mass number

b)

coefficient

c)

subscript

d)

symbol

118.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
119.
Which problem is balanced?
(Check ALL answers)
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
120.
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. 
121.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
122.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
123.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
124.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
125.
Is the following equation balanced?
4Fe + 3O2 --> 2Fe2O3
a)
yes
b)
no
126.
Is the following reaction balanced?
NaHCO3 --> Na2CO3 + H2O + CO2
a)
yes
b)
no
127.
Is the following reaction balanced?
2CH3OH + 3O2 --> 2CO2 + 4H2O
a)
yes
b)
no
128.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number in front of a chemical formula.
c)
The number in between the chemical symbols.
d)
The number behind a chemical formula.
129.
What is the part of the chemical equation in green called? 
Fe + S --> FeS
a)
products
b)
reactants
c)
yield
d)
chemical formula
130.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
131.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
132.
Element or compound?
H2O
a)
element
b)
compound
133.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
134.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
135.

Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe

a)

yes

b)

no

136.

Balance this equation

_Al +_HCl --> _H2 +_AlCl3

a)

2,6,3,2

b)

it's already balanced

c)

4,12,3,4

d)

2,1,4,5

137.

What is the Law of Conservation of Mass?

a)

It states that matter cannot be created or destroyed.

b)

It states that energy cannot be created or destroyed.

c)

It states that matter can be created or destroyed.

d)

It states that sound can be created or destroyed.

Similar Resources on Wayground

Unit 1 Summative Practice-Methods & Measurement

141 questions

Unit 1 Summative Practice-Methods & Measurement

quiz

Worksheet

•

9th Grade

General Revision for Grade 9

134 questions

General Revision for Grade 9

quiz

Worksheet

•

9th Grade

Unit 3: Vet Science

134 questions

Unit 3: Vet Science

quiz

Worksheet

•

10th - 12th Grade

DNA, RNA, Protein Synthesis, Mutations

133 questions

DNA, RNA, Protein Synthesis, Mutations

quiz

Worksheet

•

10th Grade

POTU - S1 Semester Exam Review

139 questions

POTU - S1 Semester Exam Review

quiz

Worksheet

•

9th Grade

Chem Unit 11-A

139 questions

Chem Unit 11-A

quiz

Worksheet

•

9th - 12th Grade

Europe Review

135 questions

Europe Review

quiz

Worksheet

•

6th - 9th Grade

PS 9 Semester One Exam Review January 2021

139 questions

PS 9 Semester One Exam Review January 2021

quiz

Worksheet

•

9th Grade