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Chemical Reactions Review Pt.1

Total questions: 78

Worksheet time: 3hrs 56mins

Name
Class
Date
1.

Determine whether the following equation is balanced or unbalanced. 4P +5O2 ---> 2P2O5

a)

Balanced

b)

Unbalanced

2.

Determine whether the following equations is balanced or unbalanced. H4 + O2 ---> 2H2O

a)

Balanced

b)

Unbalanced

3.

Determined whether the following equation is balanced or unbalanced. Ag + O2 ---> 2Ag2O

a)

Balanced

b)

Unbalanced

4.

Determine whether the following equation is balanced or unbalanced. H2 + Br2 ---> 2HBr

a)

Balanced

b)

Unbalanced

5.

Determine whether the following equation is balanced or unbalanced. 2Fe + 3Cl2 ---> FeCl3

a)

Balanced

b)

Unbalanced

6.

Determine whether the following equations is balanced or unbalanced. S8 + O2 ---> 8SO3

a)

Balanced

b)

Unbalanced

7.

Which coefficients would balance this chemical equation? _Fe2O3 ---> _Fe + _O2

a)

2,1,2

b)

2,4,3

c)

1,1,1

d)

1,3,2

8.
_AgNO3 + _Cu →_Cu(NO3)2 + _Ag
a)
2 AgNO3 + 2 Cu → 3 Cu(NO3)2 + 1 Ag
b)
2 AgNO3 + 1 Cu → 1 Cu(NO3)2 + 2 Ag
c)
1 AgNO3 + 2 Cu → 2 Cu(NO3)2 + 1 Ag
d)
3 AgNO3 + 2 Cu → 3 Cu(NO3)2 + 2 Ag
9.
_BaS + _PtF2 → _BaF2 + _PtS
a)
1 BaS + 1 PtF2 → 1 BaF2 + 1 PtS
b)
4 BaS + 2 PtF2 → 1 BaF2 +  1 PtS
c)
1 BaS + 2 PtF2→ 2 BaF2 +  2 PtS
d)
1 BaS + 3 PtF2 →1 BaF2 +  2 PtS
10.
_Al + _HCl →_H2 + _AlCl3
a)
2 Al + 2 HCl → 2 H2 + 6 AlCl3
b)
3 Al + 3 HCl → 6 H2 + 2 AlCl3
c)
1 Al + 1 HCl → 3 H2 + 1 AlCl3
d)
2 Al + 6 HCl → 3 H2 + 2 AlCl3
11.

Which of the pictures below shows a balanced representation of

H2 + O2 → H2O?

a)
b)
c)
d)
12.
__C6H12O6 + __O2 --> __H2O + __CO2
a)
1,6,6,6
b)
already balanced
c)
1,6,1,6
d)
2,12,12,12
13.
__H2O + __CO2 --> __C7H8 + __O2
a)
4,7,1,9
b)
4,7,1,7
c)
2,3,1,3
d)
already balanced
14.
__NaClO3 --> __NaCl + __O2
a)
2,2,2
b)
2,2,3
c)
3,2,2
d)
1,2,3
15.
__(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
16.
__BF3 + __Li2SO3 --> __B2(SO3)3 + __LiF
a)
2,3,1,3
b)
2,3,1,6
c)
4,4,2,12
d)
3,3,1,9
17.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
18.

Which equation is balanced?

a)

PbO2 + 2H2

b)

SO2 + H20 --> H2SO4

c)

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

19.
Which of the following equations are correctly balanced?
a)
12CO2 +H2O --> C6H12O6 + O2
b)
CO2 + 9H2O --> C6H12O6 + O2
c)
CO2 + H2O --> 3C6H12O6 + O2
d)
6CO2 + 6H2O --> C6H12O6 + 6O2
20.
Which number should go in the blank?
Mn + _ HNO3 → Mn(NO3)2 + H2
a)
1
b)
2
c)
3
d)
0
21.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
22.

Balance this equation...

Sb2S3 + O2 --> Sb + SO2

a)

It is balanced

b)

Sb2S3 + 3O2 --> 2Sb + 3SO2

c)

Sb2S3 + O2 --> 2Sb + SO2

d)

Sb2S3 + O2 --> 2Sb + 3SO2

23.

Name this reaction type, Cl2 + 2KI --> I2 + 2KCl

a)

Combination

b)

Single Replacement

c)

Double Replacement

d)

Decomposition

24.

Name this reaction type, CO2 + H2O --> H2CO3

a)

Decomposition

b)

Single Replacement

c)

Combination

d)

Combustion

25.

What does (aq) mean after a formula?

a)

solid

b)

liquid

c)

gas

d)

dissolved in water

26.

What type of reaction is this?

2 C6H14 + 19 O2 → 12 CO2 + 14 H2O

a)

Single Replacement

b)

Double Replacement

c)

Combustion

d)

Decomposition

27.

What type of chemical reaction is this:

Ag+S−−−>Ag2SAg+S--->Ag_2S  

a)

Combination

b)

Decomposition

c)

Single replacement

d)

Combustion

e)

Double replacement

28.

What type of reaction is this?

KNO3(s)−−−>KNO2(s)+O2(g)KNO_{3(s)}--->KNO_{2(s)}+O_{2(g)}  

a)

Combination

b)

Decomposition

c)

Single replacement

d)

Combustion

e)

Double replacement

29.

Classify the reaction by type:

Cl2+KBr−−−>KCl+Br2Cl_2+KBr--->KCl+Br_2  

a)

Combination

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

30.

Classify the following reaction:

HCl+NaOH−−−>H2O+NaClHCl+NaOH--->H_2O+NaCl  

a)

Combination

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

31.
Pb(NO3)2  +  KI --> PbI2 + KNO3
What type of reaction is this? 
a)
Synthesis 
b)
Decomposition 
c)
Single Replacement
d)
Double Replacement 
32.
__Na  +  O2 ----->  __Na2O
Type of reaction? 
Balance it too. :)
a)
Synthesis, 2Na /  4Na2O
b)
Decomposition, 4Na /  2Na2O
c)
Synthesis, 4Na /  2Na2O
d)
Decomposition, 2Na /  4Na2O
33.
What type of reaction is this?  
__H2O2 ---->  __H2O + O2
a)
Synthesis
b)
Decomposition 
c)
Single Replacement
d)
Combustion 
34.
Balance this chemical reaction......?  
__H2O2 ---->  __H2O + O2
a)
2H2O2  //  2H2O
b)
1H2O2  //  2H2O
c)
2H2O2  //  1H2O
d)
H2O2  //  2H2O
35.
__NaClO3 --> __NaCl + __O2
a)
2,2,2
b)
2,2,3
c)
3,2,2
d)
1,2,3
36.
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
37.
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
38.
Balance this equation:
Al2O3 -> Al + O2 
a)
2Al2O3 -> 2Al + 3O2 
b)
2Al2O3 -> 4Al + 3O2 
c)
3Al2O3 -> 2Al + O2 
d)
2Al2O3 -> 3Al + 2O2 
39.
The following is what type of reaction:
PbCl2 + AgNO3 → Pb(NO3)2 + AgCl
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
40.
The following is what type of reaction:
NH3 + HCl  → NH4Cl
a)
Synthesis
b)
Decomposition
c)
Single Replacement Replacement
d)
Double Replacement Replacement
41.
What type of chemical reaction is this?
Al(OH)3 → Al2O3  + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
42.

After balancing the reaction below, what would be the ratio of the coefficients?


___C3H8 + ___O2 → ___CO2 + ___H2O

a)

5 : 1 : 4 : 3

b)

4 : 5 : 1 : 3

c)

1 : 5 : 3 : 4

d)

3 : 4 : 5 : 1

43.

Which of the following reactions is a single replacement reaction?


(A) N2 + H2 → 2NH3

(B) Fe2O3 +2Al → Al2O3 + 2Fe

(C) PbCO3 → PbO + CO2

(D) N2 + O2 → H2O + NH4NO3

a)

A

b)

B

c)

C

d)

D

44.

After balancing the reaction below, what would be the ratio of the coefficients?


__Al(HCO3)3+__AlPO4→__Al2(CO3)3+__H3PO4

a)

2 : 2 : 1 : 1

b)

1 : 1 : 2 : 1

c)

1 : 1 : 1 : 1

d)

2 : 1 : 1 : 2

45.

Which of the following reactions is a decomposition reaction?


(A) N2 + H2 → 2NH3

(B) Fe2O3 +2Al → Al2O3 + 2Fe

(C) PbCO3 → PbO + CO2

(D) N2 + O2 → H2O + NH4NO3

a)

A

b)

B

c)

C

d)

D

46.

Which of the following are examples of double replacement reactions?


(Check all that apply.)

a)

HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)

b)

2H2O(l) → H2(g) + O2(g)

c)

Cu(s) + 2AgNO3(aq) → 2Ag(s) + Cu(NO3)2(aq)

d)

BaCl2(aq) + 2AgNO3(aq) → 2AgCl(s) + Ba(NO3)2(aq)

47.

Classify the following reaction:

HCl+NaOH−−−>H2O+NaClHCl+NaOH--->H_2O+NaCl  

a)

Combination

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

48.

C4H8+O2−−−>CO2+H2OC_4H_8+O_2--->CO_2+H_2O  

What type of reaction is:

a)

Double replacement

b)

Combustion

c)

Combination

d)

Decomposition

e)

Single replacement

49.

Classify the reaction by type:

Cl2+KBr−−−>KCl+Br2Cl_2+KBr--->KCl+Br_2  

a)

Combination

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

50.
Balance this reaction: ____ RbNO3 + ____ BeF2 ----> ____ Be(NO3)2 + ____ RbF
a)
1,1,1,1
b)
1,2,1,1
c)
2,1,1,2
d)
2,1,2,1
51.
Balance this reaction: ____ C5H14 + ____ O2 ----> ____ CO2 + ____ H2O
a)
1,8,5,7
b)
2,12,5,14
c)
3,27,15,24
d)
2,17,10,14
52.

How many elements are in this chemical formula?

HCl

a)

1

b)

2

c)

3

d)

4

53.

How many atoms of Carbon are in this formula? C6 H12O6C_{6\ }H_{12}O_6  

a)

6

b)

1

c)

12

54.

What is the total number of atoms in this formula? H2O2H_2O_2  

a)

2

b)

4

c)

3

55.

How many atoms does Nitrogen (N) have in the following molecule? AgNO3AgNO_3  

a)

1

b)

2

c)

3

d)

4

56.

3MnSO33MnSO_3 + MnI4MnI_4 →\rightarrow

The above are reactants in a chemical reaction. How many atoms of oxygen?

a)

3

b)

1

c)

9

57.

2 Fe(C5H5)22\ Fe\left(C_5H_5\right)_2 How many atoms of carbon? (Answer with number only)

(a)  

58.

Fe(C5H5)3Fe\left(C_5H_5\right)_3 How many atoms of hydrogen? (Answer with number only)

(a)  

59.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
60.

What is the total number of atoms in this chemical formula? C8H3NaBr12C_8H_3NaBr_{12}  

a)

18

b)

12

c)

25

d)

24

61.

How many oxygen are in Ca(OH)2

a)

2

b)

1

c)

0

d)

4

62.

How many atoms are there in Aluminium oxide?

a)

2

b)

6

c)

5

d)

3

63.

How many atoms are there in calcium carbonate?

a)

2

b)

4

c)

5

d)

3

64.

The small numbers under and to the right of element symbols in a formula are called _________________.

a)

element symbols

b)

exponents

c)

coefficients

d)

subscripts

65.

The large numbers before a chemical formula that are used as multipliers are known as __________________.

a)

element symbols

b)

exponents

c)

coefficients

d)

subscripts

66.

The materials we end with in a reaction are known as __________________.

a)

chemicals

b)

reactants

c)

products

d)

creations

67.

The materials we start with in a reaction are known as __________________.

a)

chemicals

b)

reactants

c)

products

d)

creations

68.
Balance the equation:
Si(OH)4+NaBr--> SiBr4+NaOH
a)
Si(OH)4+2NaBr--> SiBr4+NaOH
b)
Si(OH)4+4NaBr--> SiBr4+4NaOH
c)
Si(OH)4+NaBr--> SiBr4+4NaOH
d)
Si(OH)4+2NaBr--> SiBr4+2NaOH
69.

Which is the correct coefficient to balance this equation, NH4NO2 → N2 + H2O?

a)

1,1,2

b)

1,3,3

c)

3,2,1

d)

1,3,2

70.

What state of matter is this substance?

a)

solid

b)

liquid

c)

gas

d)

aqueous

71.

In what state is this substance?

a)

solid precipitate

b)

dissolved in water

c)

released as a gas

d)

liquid

72.

What does the symbol inside the circle mean?

a)

"yields, or produces"

b)

"dissolved in water"

c)

"forms a precipitate"

d)

"released as a gas"

73.

An arrow symbol that shows a reaction has taken place. The reactants have reacted to produce a new substance. (the product)

a)

yield

b)

compound

c)

precipitate

d)

product

74.

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

a)

physical change

b)

property

c)

precipitate

d)

product

75.

Which of the following are evidence of chemical change?

a)

change in color

b)

melting

c)

freezing

d)

production of a gas

e)

precipitate

76.

color change, change in temperature, the release of energy (heat, light, or sound), forms a precipitate, produces a gas.

a)

evidences of chemical change

b)

evidences of physical change

c)

reaction

d)

equation

77.

Number eight (8) is indicating ____ of the equation.

a)

solid

b)

liquid

c)

gas

d)

aqueous

78.

The number four (4) represents which part of the equation?

a)

aqueous

b)

gas

c)

liquid

d)

solid

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