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Worksheets

Chemical Reactions

Total questions: 155

Worksheet time: 5hrs 46mins

Name
Class
Date
1.

​ (a)   C2H6 + ​ (b)   O2 --> ​ (c)   H2O + ​ (d)   CO2

Choose from the below words

7

6

2

4

2.

​ (a)   HClO4 + P4O10 --> ​ (b)   H3PO4 + ​ (c)   Cl2O7

Choose from the below words

12

4

6

3.

​ (a)   N2 + ​ (b)   O2 + 2H2O --> ​ (c)   HNO3

Choose from the below words

2

5

4

3

6

4.

​ (a)   CaCl2 + ​ (b)   Na3PO4 --> Ca3(PO4)2 + ​ (c)   NaCl

Choose from the below words

3

2

6

4

5.

​ (a)   FeS + ​ (b)   O2 --> ​ (c)   Fe2O3 + 4SO2

Choose from the below words

4

7

2

3

6.

​ (a)   C3H8 + ​ (b)   O2 --> ​ ​ (c)   CO2 + ​ (d)   H2O

Choose from the below words

1

5

4

3

2

7.

What is the missing coefficient?
__SeCl + 2O2 --> 2SeO2 + Cl2

a)

1

b)

2

c)

3

d)

4

8.

15.6 grams of lead(II) nitrate is in a test tube. A 4.8-g sample of potassium iodide is an Erlenmeyer flask. The substance in the test tube is poured into the Erlenmeyer flask so that the two substances react. What is the mass of the combined products?

a)

20.4 g

b)

10.8 g

c)

4.8 g

d)

136 g

9.

Pb(NO3)2 + 2KI --> PbI2 + __KNO3

a)

1

b)

2

c)

3

d)

4

10.

HCl + NaOH --> NaCl + H2O

Categorize the following

NaCl

H2O

HCl

NaOH

Products
Reactants
11.

4P + 5O2 --> 2P2O5

Categorize the following

P

O2

P2O5

reactants
products
12.

2Fe(OH)3 --> Fe2O3 + 3H2O

Categorize the following

Fe2O3

H2O

Fe(OH)3

products
reactants
13.

4NH3 + 5O2 --> 4NO + 6H2O

Categorize the following

NH3

O2

NO

H2O

reactants
products
14.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
15.

In the reaction Pb(NO3)2 + 2KI --> PbI2 + 2KNO3, what is the role of KI?

a)

Solvent

b)

Catalyst

c)

Product

d)

Reactant

16.

​ (a)   AlCl3 + ​ (b)   K2SO4 --> Al2(SO4)3 + ​ (c)   KCl

Choose from the below words
2
3
6
4
17.

How many oxygens?

Al2(SO4)3

18.

How many aluminums?

Al2(SO4)3

19.

How many sulfurs?

Al2(SO4)3

20.

How many calciums?

Ca3(PO4)2

21.

How many phosphorus atoms?

Ca3(PO4)2

22.

How many oxygen atoms?

Ca3(PO4)2

23.

Na2O + Ca(NO3)3 --> CaO + __NaNO3

a)

1

b)

2

c)

3

d)

4

24.

2Na + __Cl2 --> 2NaCl

a)

1

b)

2

c)

3

d)

4

25.

_K2SO4 + _Na2O --> _Na2SO4 + _K2O

a)

1, 2, 1, 2

b)

1, 2, 2, 1

c)

1, 1, 1, 1

d)

2, 1, 1, 2

26.

_Ca(NO3)2 + _AlCl3 --> _CaCl2 + _Al(NO3)3

a)

2, 3, 2, 3

b)

3, 2, 3, 2

c)

1, 3, 2, 3

d)

3, 2, 2, 3

27.

_NaCl + _H2SO4 --> _Na2SO4 + _HCl

a)

2, 1, 1, 2

b)

2, 1, 2, 1

c)

1, 2, 1, 2

d)

3, 1, 2, 1

28.

_Cl2 + _Na2O --> _O2 + _NaCl

a)

2, 2, 1, 4

b)

2, 1, 2, 4

c)

1, 2, 1, 4

d)

2, 1, 1, 2

29.

​ (a)   Na + ​ (b)   K2SO4 --> Na2SO4 + 2K

Choose from the below words
2
1
30.

Ca(NO3)2 + K2SO4 --> ​ (a)   CaSO4 + ​ (b)   KNO3

Choose from the below words
1
2
3
31.

Is this equation balanced?

a)

Yes

b)

No

32.

To balance an equation you should:

a)

ONLY change subscripts.

b)

ONLY change coefficients.

c)

Change BOTH subscripts and coefficients.

33.

Is this equation balanced?

a)

Yes

b)

No

34.

_Fe + _O2 --> _Fe2O3

a)

4, 3, 2

b)

2, 1, 1

c)

1, 1, 1

d)

3, 2, 1

35.

_C3H8 + _O2 --> _CO2 + _H2O

a)

1, 5, 2, 4

b)

2, 5, 3, 4

c)

1, 4, 3, 4

d)

1, 5, 3, 4

36.

Which of the following is a balanced equation?

a)

H2 + O2 --> H2O

b)

H2 + 2O2 --> H2O

c)

2H2 + O2 --> 2H2O

d)

2H2 + 2O2 --> 2H2O

37.

AlCl3 + ​ (a)   Na --> ​ (b)   Al + 3NaCl

Choose from the below words
3
1
2
38.

​ (a)   Ca(NO3)2 + ​ (b)   AlCl3 --> 3CaCl2 + 2Al(NO3)3

Choose from the below words
3
2
39.

​ (a)   H3PO4 +​ (b)   Ca(OH)2 --> ​ (c)   Ca3(PO4)2 +​ (d)   H2O

Choose from the below words
2
3
1
6
40.

Which reactant is needed to balance this equation and follow the law of conservation of mass?

​ (a)   + FeCl2 --> 2AgCl + Fe(NO3)2

Choose from the below words
2AgNO3
2Ag(NO3)4
Fe2Cl2
Fe3NO2
41.

In this chemical equation, if the coefficient in front of "Na" were changed to 4, what coefficient in front of NaCl would be needed to balance this equation?

42.

What are the respective coefficients needed to balance this equation?

_N2(g) + H2(g) --> _NH3(g)

a)

1, 1, 1

b)

1, 2, 3

c)

1, 3, 2

d)

3, 3, 2

43.

In a laboratory, students added some sodium hydrogen carbonate solution to the bottom of a flask. Then, a small test tube was filled with acetic acid and placed in the flask and massed. The students mixed the the test tube solution with the solution in the flask resulting in a reaction that produced sodium acetate, water, and carbon dioxide gas. The mass was taken again after the reaction. The reaction is illustrated here. The mass of the reactants does not equal the products in the reaction between sodium hydrogen carbonate and acetic acid pictured above. Given the law of conservation of mass, which states mass cannot be created or destroyed, why is there a difference in mass?

a)

Student error in recording masses.

b)

The acid used up the sodium hydrogen carbonate

c)

The reaction was exothermic and warm glass has a lower mass than cool glass.

d)

The carbon dioxide escaped because the flask was not stoppered.

44.

Which statement of the following are true regarding the equation listed below?

Fe + CuCl2 → FeCl2 + Cu

a)

The equation is balanced.

b)

The equation is not balanced.

45.

_NH3 + O2  → _N2 + _H2O

After correctly balancing this chemical equation, what coefficient will go before NH3?

46.
47.

​ (a)   PbS(s) + ​ (b)   O2(g) --> 2PbO(s) + 2SO2(g)

Choose from the below words
2
3
1
4
48.

​ (a)   C2H4(g) + ​ (b)   O2(g) --> ​ (c)   CO2(g) + 2H2O(g)

Choose from the below words
1
3
2
49.

_C2H6 + _O2 --> _CO2 + _H2O

a)

2, 5, 3, 4

b)

1, 5, 2, 4

c)

2, 7, 4, 6

d)

1, 3, 2, 3

50.

_Al + _O2 --> _Al2O3

a)

3, 2, 1

b)

2, 1, 1

c)

2, 3, 1

d)

4, 3, 2

51.

Matter can not be created nor destroyed: it can only be

a)


Destroyed a little bit

b)

Transformed, changed

c)

Invisible

d)

None of the above

52.

The number to the lower side of an element is a 

a)

Subscript

b)

Coefficient

c)

Superscript

d)

Charge

53.

The number in front of a compound or element is a 

(a)  

54.

A chemical reaction is balanced when

a)

both sides have the same elements

b)

Same subscripts

c)

Both sides have the same  number of atoms

d)

Same coefficients

55.

Which of these is not a chemical reaction?

a)


Burning of wood

b)

Mixing vinegar and baking soda

c)

Milk going bad

d)

Melting of ice

56.

If a reaction starts with 20g of reactants it should produce 

a)

a total of 40g of products

b)

a total of 80 g of products

c)


a total of 10g of products

d)

a total of 20g of products

57.

What is the Law of Conservation of mass?

a)


Mass is created in a chemical reaction

b)

New chemicals formed from a chemical reaction have a larger overall mass than the original reactants

c)

Mass is never created or destroyed

d)

Mass is created in a physical change

58.

When sodium and chlorine combine to form sodium chloride, sodium chloride is the:

a)

product

b)

reactant

59.

Maria fills a bowl with 200 g of water. She puts the bowl of water in the freezer, and the water freezes. Which will most likely be the mass of the frozen water?

a)


50 g

b)

200 g

c)

100 g

d)

400 g

60.

How many atoms do you have in the compound 2MgCl2?

a)

2

b)

6

c)

4

d)

8

61.

How many atoms do you have in the chemical formula 2Mg(ClO3)2?

a)

2

b)

9

c)

7

d)

18

62.

Law of conservation of mass states the amounts of atoms in the reactants and the products...

a)

Increase

b)


Stay the same

c)

Decrease

d)


No correct answer

63.

Does the equation H2+O2 →H2O follow the Law of Conservation of Mass?

a)

Yes, because the atoms are equal.

b)

No, because there are more atoms in the product.

c)

No, because more info is needed.

d)

No, because there are more atoms in the reactant.

64.

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 mass is the same

c)

the product is half the mass of the reactants

d)

the mass changes depending on the reaction

65.

When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced

a)

charge

b)

random number

c)

coefficient

d)

subscript

66.

PCl5 + ​ (a)   H2O --> ​ (b)   HCl + H3PO4

Choose from the below words
4
5
3
67.

Which equation is balanced?

a)

PbO2 + 2H2--> H2SO4

b)

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

c)

SO2 + H20 --> H2SO4

d)

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

68.

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

69.

_Zn + _HCl --> ZnCl2 + _H2

a)

1, 1, 2, 1

b)

1, 2, 1, 1

c)

1, 1, 1, 2

d)

2, 1, 1, 1

70.

_Mg + _Cl2 --> _MgCl2

a)

1, 2, 1

b)

2, 1, 1

c)

1, 1, 2

d)

already balanced

71.

How many atoms of aluminum are on each side of the following equation:

4Al + 3O2 --> 2Al2 O3

72.

​ (a)   P4 + ​ (b)   O2 --> ​ (c)   P2O3

Choose from the below words
1
3
2
73.

​ (a)   Mg(OH)2 + ​ (b)   HCl --> MgCl2 + 2H2O

Choose from the below words
1
2
4
6
74.

2AgI + Na2S --> ​ (a)   Ag2S +​ (b)   NaI

Choose from the below words
1
2
3
4
75.

PCl5 + ​ (a)   H2O --> H3PO4 + ​ (b)   HCl

Choose from the below words
4
5
1
2
3
76.
4Si + S8 --> 2Si2S4
a)
Synthesis
b)
Decomposition
c)

Single replacement

d)

Double replacement

77.
3Ca + 2AlCl3 --> 3CaCl2 + 2Al
a)
Synthesis
b)
Decomposition
c)

Single replacement

d)

Double replacement

78.
3KOH + H3PO4 --> K3PO4 + 3H2O
a)
Synthesis 
b)
Decomposition
c)

Single replacement

d)

Double replacement

79.
2Pb(NO3)2 --> 2PbO + 4NO2 + O2
a)
Synthesis 
b)
Decomposition
c)

Single replacement

d)
Combustion
80.
3Mg + N2 --> Mg3N2
a)
Synthesis 
b)
Decomposition
c)

Single replacement

d)
Combustion
81.
2NO2 --> N2 + 2O2
a)
Synthesis
b)
Decomposition
c)

Single replacement

d)
Combustion
82.
P4 + 3O2 --> 2P2O3
a)
Synthesis 
b)
Decomposition
c)

Single replacement

d)
Combustion
83.
Fe + H2SO4 --> Fe2(SO4)3 + H2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
84.
Which reaction type is the following: C5H10O4 + O2 --> CO2 + H2O
a)
Decomposition
b)
Single Replacement
c)
Combustion
d)
Double Replacement
85.
Which of the following is the general formula for a decomposition reaction?
a)
A + B  → AB
b)
AB → A + B
c)
AB + C → AC + B
d)
AB + CD → AC + BD
86.
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
87.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
88.
Balance this equation:
 __Li + __Cl2 -> __LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li +  Cl2 -> 2LiCl
89.
C4H12 + O2 --> CO2 + H2O
a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
90.
H2SO4 + Fe -->H2 + FeSO4
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
91.
PbCl2 + AgNO3 ---> Pb(NO3)2 + AgCl 
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
92.
NH3 + HCl ---> NH4Cl 
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
93.
Which chemical reaction switches 2 elements?
a)
Double Replacement
b)
Single Replacement
c)
Combustion
d)
Decomposition
94.
Which chemical reaction takes place when 2 substances react to form a single product?
a)
Decomposition
b)
Double Replacement
c)
Single Replacement
d)
Synthesis
95.
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
96.

What is the coefficient of O2 when the equation _C4H10 + _O2 --> _CO2 + _H2O is balanced?

a)

5

b)

6

c)

10

d)

8

97.

Which of the following is a balanced chemical equation?

a)

2H2 + O2 --> 2H2O

b)

H2 + O2 --> H2O

c)

2H2 + 2O2 --> 2H2O

d)

H2 + 2O2 --> H2O2

98.
What is decomposition?
a)
putting substances together
b)
breaking substances apart
c)
element replacing another element in a compoud
d)
burning of a subtance
99.
What type of chemical reaction is this?
Al(OH)3 → Al2O3  + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
100.
Ions in two compounds switch. 
a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
101.
3Ca + 2AlCl3 --> 3CaCl2 + 2Al
a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Double Displacement
102.
One reactant into several products.
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
103.
Which of the following is an example of a chemical change?
a)
melting a stick of butter
b)
dissolving salt in water
c)
using magnesium to displace hydrogen gas from water
104.
Which generalized equation represents a synthesis reaction?
a)
A + BC → AC+ B
b)
A + B → AB
c)
AB → A + B
105.
Which generalized equation represents a single displacement reaction?
a)
A + BC → AC+ B
b)
A + B → AB
c)
AB → A + B
106.

What type of reaction is taking place in this picture?

a)

Synthesis

b)
Decomposition
c)

Single Replacement

d)

Double Replacement

e)

Combustion

107.

Classify each of these chemical reactions.

Categorize the following

2MnI3 --> 2Mn + 3I2

2Al + 3CuSO4 --> Al2(SO4)3 + 3Cu

2Na + S --> Na2S

2KCl + F2 --> Cl2 + 2KF

2Mg + O2 -- 2MgO

HCl + NaOH --> NaCl + H2O

H2O --> H2 + O2

2FeBr3 + 3H2SO4 --> Fe2(SO4)3 + 6HBr

Synthesis
Single Replacement
Double Replacement
Decomposition
108.

Classify each chemical reaction.

Categorize the following

C3H8 + 5O2 --> 3CO2 + 4H2O

Al(NO3)3 + 3NaOH --> Al(OH)3 + 3NaNO3

4Al + 3O2 --> 2Al2O3

2HgO --> 2Hg + O2

Combustion
Double Replacement
Synthesis
Decomposition
109.

​ 6CO2 + ​ (a)   H2O + energy--> ​ (b)   C6H12O6 +​ 6O2

Choose from the below words
6
1
2
4
3
110.

​ (a)   Al + ​ (b)   O2 --> ​ (c)   Al2O3

Choose from the below words
4
3
2
111.

Which of the following is a balanced equation?

a)

CH4 + 3O2 --> CO2 + 2H2O

b)

2CH4 + O2 --> CO2 + 2H2O

c)

CH4 + O2 --> CO2 + H2O

d)

CH4 + 2O2 --> CO2 + 2H2O

112.

How many atoms are present in the compound 3CaCO3?

a)

9

b)

3

c)

15

d)

18

113.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
114.
Balance this equation...
HgO --> Hg + O2
a)
It is balanced 
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
d)
I don't know...Oh well!
115.
What happens in ALL chemical changes?
a)
Change in state of matter
b)
A new substance is formed
c)
Bubbles are produced
d)
An explosion
116.
Is the following equation balanced or unbalanced?
Fe + S --> FeS
a)
balanced
b)
unbalanced
117.

In reactions, products must be equal to..

a)

Products

b)

Reactants

c)

Starters

d)

Enders

118.

According to the law of conservation of mass, how does the amount of each element on the product side compare to each element on the reactant side?

a)

The amount of atoms on each side is equal

b)

The amount of atoms on the product side is greater

c)

The amount of atoms on the reactant side is greater

d)

Depends on the reaction

119.

Balance the following chemical equation:

____KClO3 → ____KCl + ____O2

a)

2KClO3 → 4KCl + O2

b)

4KClO3 → 2KCl + 3O2

c)

2KClO3 → 2KCl + 3O2

120.

Which reaction type is the following:

C5H10 + O2 --> CO2 + H2O

a)

Decomposition

b)

Synthesis

c)

Complete Combustion

d)

Double Replacement

121.
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.
122.
In any chemical reaction, the mass of the products is always:
a)
slightly less than the mass of the reactants
b)
much less than the mass of the reactants
c)
the same as the mass of the reactants
d)
greater than the mass of the reactants
123.
Your mother used pancake mix, eggs, and milk to make pancakes.  Which of these is the product?
a)
the pancake mix
b)
the eggs
c)
the milk
d)
the pancakes
124.
How do chemical reactions turn substances into new substances?
a)
with burning acid
b)
the molecules mix together and create new substances
c)
the atoms break apart and combine back together in new ways
d)
the ionic compounds mix in water to form solutions
125.
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
126.

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)
127.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
128.
Which problem is balanced?
(Check ALL answers)
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
129.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
130.

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

131.
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
132.

Balance the following equation:

___ Mg+ ___ O2→___ MgO

a)

1, 1, 3

b)

2, 1, 2

c)

1, 2, 1

d)

2, 2, 2

133.

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

134.
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
135.
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
136.

​ H3PO4 + ​ (a)   KOH --> K3PO4 + ​ 3H2O

Choose from the below words
3
2
4
5
137.

​ (a)   K + ​ (b)   B2O3 --> ​ (c)   K2O +​ (d)   B

Choose from the below words
6
1
3
2
138.

​ (a)   Na + ​ (b)   NaNO3 --> ​ (c)   Na2O + ​ (d)   N2

Choose from the below words
10
2
6
1
139.

​ (a)   Na + ​ (b)   O2 --> ​ (c)   Na2O

Choose from the below words
4
1
2
140.

​ (a)   Al + ​ (b)   S8 --> ​ (c)   Al2S3

Choose from the below words
16
3
8
2
141.

What type of reaction?

4C + S8 --> 4CS2

(a)  

142.

What type of reaction?

2H3PO4 + 3Mg(OH)2 --> Mg3(PO4)2 + 6H2O

(a)  

143.

What type of reaction?

KOH + HBr --> KBr + H2O

(a)  

144.

What type of reaction?

6Cs + N2 --> 2Cs3N

(a)  

145.

What type of reaction?

2C6H6 + 15O2 --> 12CO2 + 6H2O

(a)  

146.

What type of reaction?

2C10H22 + 31O2 --> 20CO2 + 22H2O

(a)  

147.

What type of reaction?

3Li + AlCl3 --> 3LiCl + Al

(a)  

148.

What type of reaction?

NH3 + HCl --> NH4Cl

(a)  

149.

What type of reaction?

2KNO3 --> 2KNO2 + O2

(a)  

150.

What type of reaction?

2Al + 3H2SO4 --> Al2(SO4)3 + 3H3

(a)  

151.

What type of reaction?

3BaF2 + 2K3PO4 --> Ba3(PO4)2 + 6KF

(a)  

152.

What type of reaction?

CaCO3 --> CaO + O2

(a)  

153.

What type of reaction?

2HgO (s) --> 2Hg (l) + O2 (g)

(a)  

154.

What type of reaction?

2NaOH (s) --> Na2O (s) + H2O (g)

(a)  

155.

What type of reaction?

CH4 + 2O2 --> CO2 + 2H2O

(a)  

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