wayground logo

Free Printable Worksheets

NEW

Font size

S
M
L
XL
Worksheets

U7 Chemical Reactions Review

Total questions: 65

Worksheet time: 2hrs 28mins

Name
Class
Date
1.
Which side of a chemical equation is the product side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
2.
The blue numbers in the image below represent ________
a)
Charges
b)
coefficients
c)
subscripts
d)
none of the answers are correct
3.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
6
c)
8
d)
24
4.
How many Al atoms are in this compound?         4Al2O3
a)
2
b)
8
c)
6
d)
4
5.
___________________ are the elements are compounds that leave (are formed in) a chemical
reaction.
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
6.
What is the arrow in a chemical equation...
H2 + O --> H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
7.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
8.
Which side of a chemical equation is the reactant side?
a)
Left (before the arrow sign)
b)
Right (after the arrow sign)
9.
How many Oxygen (O) atoms are in 2C2HO8Cl2
a)
2
b)
16
c)
8
d)
5
10.
How many Hydrogen (H) atoms are in NH3O5
a)
3
b)
4
c)
5
d)
1
11.
How many molecules of Carbon are in the following formula? 3C2H6
a)
3
b)
6
c)
12
d)
18
12.
Given the equation:
2Na + S --> Na2S
Name the reactant(s).
a)
Na only
b)
S only
c)
Na2S only
d)
Na and S
13.
Given the equation:
2Na + S --> Na2S
Name the product(s).
a)
Na only
b)
S only
c)
Na2S only
d)
Na and S
14.
What type of reaction occurs between an element and a compound?
Zn + 2HCl --> ZnCl2 + H2
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
15.
What kind of reaction is this:
2H2 + O2 --> 2H2O
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
16.
What kind of reaction is this:
4Fe  +  3O2 →   2Fe2O3 
a)
Synthesis
b)
Decomposition
c)
Single Replacement 
d)
Double Replacement
17.
What kind of reaction is this:
2H2O2 →2 H2O + O2
a)
Synthesis
b)
Decomposition
c)
Single Replacement 
d)
Combustion
18.
What kind of reaction is this:
2C3H7OH +9O2 -> 6CO2 + 8H2O
a)
Double Replacement
b)
Combustion
c)
Single Replacement
d)
Decomposition
19.
What kind of reaction is this:
Fe + CuSO4 -> Cu + FeSO4
a)
Double Replacement
b)
Decompostion
c)
Single Replacement
d)
Combustion
20.
The reaction below is an example of?
AgNO3 + NaCl → AgCl + NaNO3
a)
Single Replacement
b)
Double Replacement
c)
Decomposition
d)
Combustion
21.
What kind of reaction is this:
 CaCO3 + Ag2SO4 → CaSO4 + Ag2CO3 
a)
Decomposition
b)
Single Replacement
c)
Double Replacement
d)
Combustion
22.
An element plus additional element reacts to form one product is an example of which type of chemical reaction? 
a)
combustion
b)
decomposition 
c)
synthesis 
d)
single replacement
23.
Which type of reaction takes place in the presence of oxygen and produces carbon dioxide and water?
a)
double replacement 
b)
decomposition 
c)
combustion 
d)
single replacement
24.
Which type of reaction can be recognized by the general pattern?
A + BC--> AC + B
a)
Decomposition
b)
Combustion
c)
Single Replacement
d)
Double Replacement
25.
Which type of reaction involves one element and one compound reacting?
a)
Single Replacement
b)
Double Replacement
c)
Combustion
d)
Synthesis
26.
What type of reaction is illustrated below?
2HI --> H2  +  I2
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
27.
Classify
HI → H2 + I2
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
28.
Classify
Zn + H2S → ZnS + H2
a)
synthesis
b)
combustion
c)
single replacement
d)
double replacement
29.
Classify
CH4 + O2 → CO2 + H2O 
a)
single replacement
b)
double replacement
c)
synthesis
d)
combustion
30.
Classify
FeS + HCl → H2S + FeCl2
a)
synthesis
b)
combustion
c)
single replacement
d)
double replacement
31.
Which of the following general formulas represents a single-displacement reaction?
a)
AB → A + B   
b)
A + B → AB
c)
A + BC → AC + B
d)
AB + CD → AD + CB
32.
The formula AB → A+B represents what type of chemical reaction?
a)
synthesis
b)
decomposition
c)
single displacement
d)
double replacement
33.
Two Reactants and One Product
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
34.
One element replaces another in a compound.
a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
35.
Ions in two compounds switch. 
a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
36.

PCl5 + ___ H2O → ___ HCl + H3PO4

a)

4, 5

b)

1, 6

c)

3, 8

d)

2,2

37.

__ Al + __ FeO → Al2O2 + __ Fe

a)

1, 1, 2

b)

2,1,2

c)

2, 2, 2

d)

2,4,2

38.
 Mg  +  ___ HCl  →   MgCl2  +   H2
a)
1
b)
2
c)
3
d)
4
39.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
40.
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
41.
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. 
42.
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
43.
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
44.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
45.
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
46.

All of these exist as diatomic molecules except...

a)

F

b)

N

c)

O

d)

S

47.

Are molecules of two atoms of the same element. Elements found is nature this way are, H2, O2, N2, F2, Cl2, Br2 and I2.

a)

valance electrons

b)

atomic mass

c)

atomic weight

d)

diatomic molecules

48.

In reaction A +B --> C, reactants A + B have a total mass of 9g. What is the mass of product C?

a)

4g

b)

5g

c)

9g

d)

14g

49.

In reaction A +B --> C, reactant A has a mass of 4g and product C has a mass of 9g. What is the mass of reactant B

a)

4g

b)

5g

c)

9g

d)

14g

50.

In reaction A +B --> C, reactant B has a mass of 9g and product C has a mass of 14g. What is the mass of reactant A?

a)

4g

b)

5g

c)

9g

d)

14g

51.

24 g of magnesium reacts with 38 g of fluorine to produce ______ g of magnesium fluoride

a)

14

b)

24

c)

38

d)

62

52.

12.67 g of Carbon reacts with 25.33 g of oxygen to produce ______ g of Carbon Dioxide

a)

14

b)

24

c)

38

d)

62

53.

How many sulfur atoms must be present in the products after a reaction between the following reactants: 2SO2 +2H2O22SO_2\ +2H_2O_2  

a)

2

b)

3

c)

4

d)

8

54.
ΔH value in an endothermic reaction is a positive number.
a)
True
b)
False
55.

What is the Heat of Reaction ΔH\Delta H  for this reaction?

a)

-200 KJ

b)

200 KJ

c)

400 KJ

d)

-300 KJ

56.

How much activation energy is needed for this reaction?

a)

300 KJ

b)

500 KJ

c)

400 KJ

d)

100 KJ

57.

Are the products or reactants of this reaction storing more energy in their chemical bonds?

a)

Both storing the same

b)

No way to tell

c)

Products

d)

Reactants

58.

What type of reaction is this?

a)

Exothermic

b)

Endothermic

c)

Energy Producing

d)

No way to tell

59.

What kind of equation is this: 2KI + MgCl2 + 200KJ ----> 2KCl + MgI2

a)

Endothermic

b)

Exothermic

60.

How can you tell this reaction is exothermic: MgO + CaS ----> CaO + MgS + 200 KJ

a)

Energy is written on the products side

b)

Energy is being released

c)

Less energy is stored on product side

d)

All of these tell me

61.

What do you call the energy that is required to start a reaction?

a)

Alternative energy

b)

Activation energy

c)

Atmospheric energy

62.
When iron nails get rusty, heat is released.  What process is this?
a)
Exothermic
b)
Endothermic
63.

A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true?

a)

It is an exothermic reaction

b)

It is an endothermic reaction

64.

O2(g) + 2 H2 (g) → 2 H2O (g) + EnergyO_2\left(g\right)\ +\ 2\ H_2\ \left(g\right)\ \rightarrow\ 2\ H_2O\ \left(g\right)\ +\ Energy  

a)

endothermic

b)

exothermic

65.

6 CO2+ 6 H2O + Energy → C6H12O6 + 6 O26\ CO_2+\ 6\ H_2O\ +\ Energy\ \rightarrow\ C_6H_{12}O_6\ +\ 6\ O_2

a)

endothermic reaction

b)

exothermic reaction

Similar Resources on Wayground

Let's Review! 2nd Semester

62 questions

Let's Review! 2nd Semester

quiz

Worksheet

•

10th Grade

Periodic Table Test

70 questions

Periodic Table Test

quiz

Worksheet

•

9th - 12th Grade

042 e- configurations

60 questions

042 e- configurations

quiz

Worksheet

•

10th - 12th Grade

18.1.1 P Rates and Factors

66 questions

18.1.1 P Rates and Factors

quiz

Worksheet

•

10th Grade - University

Chemistry Exam #7 Review Ionic and Covalent Bonding

69 questions

Chemistry Exam #7 Review Ionic and Covalent Bonding

quiz

Worksheet

•

10th Grade

Matter $ Properties of the Matter

61 questions

Matter $ Properties of the Matter

quiz

Worksheet

•

6th - 12th Grade

Stoichiometry Practice

64 questions

Stoichiometry Practice

quiz

Worksheet

•

10th - 12th Grade

Midterm Review

68 questions

Midterm Review

quiz

Worksheet

•

10th Grade