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Balancing and Identifying Chemical Reactions

Total questions: 101

Worksheet time: 2hrs 52mins

Name
Class
Date
1.

Which equation is balanced?

a)

PbO2 + 2H2

b)

SO2 + H20 --> H2SO4

c)

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

2.

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

3.
The numbers needed to balance the equation are:
a)
1, 1, 1, 2
b)
1, 1, 2, 2
c)
1, 1, 1, 1
d)
2, 3, 1, 3
4.
The numbers needed to balance the equation are:
a)
2, 7, 6, 4
b)
2, 1, 3, 2
c)
3, 1, 1, 3
d)
2, 3, 1, 3
5.

Reactions that have hydrocarbons (CH4) and oxygen as reactants and carbon dioxide and water as products

a)

Conservation of Mass

b)

combustion

c)

double replacement

d)

decomposition

6.

When two or more substances combine to form a more complex substance

a)

compound

b)

double replacement

c)

synthesis

d)

catalyst

7.

Breaks down compounds into simpler products. Starts with one reactant and ends with 2 or more products

a)

decomposition

b)

synthesis

c)

combustion

d)

single replacement

8.

One compound and a free element that recombine to yield a new compound and a new free element

a)

combustion

b)

synthesis

c)

decomposition

d)

single replacement

9.

Starts with two compounds as reactants, that recombine to form two new compounds as products

a)

compound

b)

catalyst

c)

combustion

d)

double replacement

10.

Which type of chemical reaction is this:

Mg + O2 ------- MgO

a)

synthesis

b)

decomposition

c)

combustion

d)

single replacement

11.

Which type of chemical reaction is this:

HgO ------- Hg + O

a)

synthesis

b)

double replacement

c)

combustion

d)

decomposition

12.

Which type of chemical reaction is this:

C2H4 + 3O2 -------- 2CO2 + 2H2O

a)

double replacement

b)

decomposition

c)

combustion

d)

synthesis

13.

Which type of chemical reaction is this:

FeCl2 + K2S --------- FeS + 2KCl

a)

synthesis

b)

double replacement

c)

combustion

d)

single replacement

14.

Which type of chemical reaction is this:

3Fe + 4H2O -------- Fe3O4 + 4H2

a)

synthesis

b)

single replacement

c)

decomposition

d)

double replacement

15.

What is the left part of a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical equation

16.

What is the right part of a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical Equation

17.

How many Mn atoms are found in the following compound?

2MnO4

a)

1

b)

2

c)

4

d)

8

18.

Is the following equation balanced?

Al + O2 ---> 2Al2O3

a)

YES

b)

NO

19.

What is the number before a chemical formula called?

Example: 2H2 + O2 ---> 2H2O

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

20.

Balance this equation:

H2 + Cl2 ---> HCl

a)

It is balanced.

b)

H2 + Cl2 ---> 2HCl

c)

3H2 + Cl2 ---> 6HCl

d)

H2 + 3Cl2 ---> 6HCl

21.

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.

22.

What are the numbers that you CANNOT change in a chemical equation? 

a)
Coefficient
b)
Products
c)
Reactants
d)

Subscripts

23.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
24.

What reaction has the following general formula:

A + CD --> C + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

25.

What reaction has the following general formula:

AB + CD --> CB + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

26.

What type of reaction is the equation C + O2 → CO2?

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

27.

What type of reaction is the equation

Cu + 2Ag(NO3) → 2Ag + Cu(NO3)

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

28.

What type of reaction is the equation


MgCl2 + Li2CO3 → MgCO3 + 2 LiCl

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

29.
If reaction starts with 20g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
30.
When balancing equations what does
 -->
mean?
a)
subscript
b)
equals
c)
it is just an arrow
d)
yield
31.
The coefficient in  3H2O is
a)
6
b)
2
c)
3
d)
5
32.

How many atoms of Carbon are in the following formula?

3C2H6

a)

3

b)

6

c)

9

d)

18

33.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
34.
How many total atoms are represented?         4Al2O3
a)
2
b)
8
c)
5
d)
20
35.
A chemical reaction is balanced when
a)
both sides have the same elements
b)
Both sides have the same  number of atoms
c)
Same subscripts
d)
Same coefficients
36.

Balance this reaction: ____ GaF3 + ____ Cs ---> ____ CsF + ____ Ga

a)

1,1,3,1

b)

1,2,3,1

c)

2,3,3,1

d)

1,3,3,1

37.

Balancing this reaction: ____ CH4 + ____ O2 ---> ____ CO2 + ____ H2O

a)

2,1,3,1

b)

1,2,1,2

c)

1,2,2,1

d)

2,1,1,2

38.
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
39.
Balance this equation,            Al2O3 ---> Al + O2 
a)
Cannot be balanced
b)
2Al2O3 ---> 2Al + 3O2 
c)
2Al2O3 ---> 4Al + 3O2 
d)
3Al2O3 ---> 2Al + O2 
40.
_K + _Cl2 →_KCl
a)
2 K + 16 Cl2 → 8 KCl
b)
2 K + 1 Cl2 → 2 KCl
c)
3 K + 4 Cl2 → 3 KCl
d)
1 K + 1 Cl2 →1 KCl
41.
Which of the following is an unbalanced equation?
a)
CaCO3 --> CaO + CO2
b)
PbO2 + 2H2-->2Pb + H2O
c)
2Na+ 2H2O-->2NaOH + H2
d)
CS2 + 2O2 --> CO2 + 2SO2
42.

_P4+_O2 → _P2O3

a)

3 P4+1 O2 → 2 P2O3

b)

1 P4+1 O2 → 2 P2O3

c)

1 P4+ 3 O2 → 2 P2O3

d)

1 P4+ 2 O2 → 3 P2O3

43.

What are the coefficients that will balance the skeleton equation below?

__MgS + __O₂ → __MgO + __SO₂

a)

3,2,2,3

b)

2,3,2,2

c)

2,3,2,3

d)

3,2,2,1

44.

What type of reaction is the following:
3CuS +2Al −> Al2S3+3Cu3CuS\ +2Al\ ->\ Al_2S_3+3Cu

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

45.

What type of reaction is the following:
2KI −> 2K + I22KI\ ->\ 2K\ +\ I_2  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

46.

What type of reaction is the following:
C11H24+17O2−> 11CO2 + 12H2OC_{11}H_{24}+17O_2->\ 11CO_2\ +\ 12H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

47.

What type of reaction is the following:
BaCl2+2KI −> 2KCl + BaI2BaCl_2+2KI\ ->\ 2KCl\ +\ BaI_2  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

48.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

49.

What reaction has the following general formula:
CxHy + O2 −>CO2 + H2OC_xH_y\ +\ O_2\ ->CO_{2\ }+\ H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

50.

What reaction has the following general formula:

AB + CD --> CB + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

51.

What reaction has the following general formula:

AB --> A + B

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

52.

What reaction has the following general formula:

A + CD --> C + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

53.

Which type of chemical reaction is this:

3Fe + 4H2O -----> Fe3O4 + 4H2

a)

synthesis

b)

single replacement

c)

decomposition

d)

double replacement

54.

Which type of chemical reaction is this:

C2H4 + 3O2 -----> 2CO2 + 2H2O

a)

double replacement

b)

decomposition

c)

combustion

d)

synthesis

55.
Which side of a chemical equation os the product side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
56.
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
57.
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
58.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
59.
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
60.
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
61.
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
62.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
63.
Which problem is balanced?
a)

1 PbO2 + 2 H2

b)

1 SO2 + 2 H20 --> 2 H2SO4

c)
2Na + 2H2O --> 2NaOH + H2
64.

__ HCl + __ Ca(OH)2 --> __CaCl2 + __H2O

a)

1,1,1,1

b)

1,2,1,2

c)

2,1,1,2

d)

4,2,2,4

65.

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

a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
66.

3 Pb + 2 H3PO4 ----> 3 H2 + 1 Pb3(PO4)2

a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
67.

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

a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
68.

3 HBr + 1 Al(OH)3 ----> 3 H­2O + 1 AlBr3

a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
69.

2 AgNO3 + 1 Cu ----> 1 Cu(NO3)2 + 2 Ag

a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
70.

2 C5H5 + 1 Fe ----> 1 Fe(C5H5)2

a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
71.

1 SeCl6 + 1 O2 ----> 1 SeO2 + 3 Cl2

a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
72.

2 MgI2 + 1 Mn(SO3)2 ----> 2 MgSO3 + 1 MnI4

a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
73.

1 CaO3  ----> 1 CaO + 1 CO2

a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
74.

2 NO2 ----> 2 O2 + 1 N2

a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
75.

__ Pb + __FeSO4 ----> __PbSO4 + __Fe

a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
76.

1 CaCO3 ----> 1 CaO + 1 CO2

a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
77.

1 P4 +  3 O2 ----> 2 P2O3

a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
78.

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

a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
79.

Is the following equation balanced?

Al + O2 ---> 2Al2O3

a)

YES

b)

NO

80.

What is the number before a chemical formula called?

Example: 2H2 + O2 ---> 2H2O

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

81.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
82.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
83.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
84.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
85.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
86.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
87.

Balance the following equation:

___ H2+ ___ O2→___ H2O

a)

1, 1, 3

b)

2, 2, 2

c)

1, 2, 1

d)

2,1, 2

88.

Balance the following equation:

___ SeCl6+ ___ O2→___ SeO2+____Cl2

a)

1, 1, 1, 3

b)

2, 1, 2, 1

c)

1, 2, 1, 2

d)

2, 2, 2, 4

89.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
90.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
91.
Element or compound?
H2O
a)
Element
b)
Compound
92.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
93.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
94.
In a chemical reaction, everything to the rightof the arrow is called ______________.
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
95.
A + B → AB : is the general form for which reaction type?
a)
Double Replacement
b)
Synthesis
c)
Combustion
d)
Decomposition
96.
Identify this type of reaction,
Cl2 + 2KI -->  I2 + 2KCl
a)
Synthesis
b)
Single Replacement
c)
Double Replacement
d)
Decomposition
97.
Which reaction type is the following: AgF + CaCl2 --> AgCl + CaF2
a)
Decomposition
b)
Single Replacement
c)
Synthesis
d)
Double Replacement
98.

3Mg + N2 --> Mg3N2

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

99.
Balancing this reaction: ____ CH4 + ____ O2 ---> ____ CO2 + ____ H2O
a)
2,1,3,1
b)
1,2,1,2
c)
1,2,2,1
d)
2,1,1,2
100.
Balance this reaction: ____ NaF + ____ Br2 ---> ____ NaBr + ____ F2
a)
3,1,2,1
b)
1,2,3,4
c)
2,1,2,1
d)
1,2,1,2
101.
__H2O2 --> __H2O + __O2
a)
already balanced
b)
2,1,1
c)
2,2,1
d)
2,1,2

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