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Worksheets

Chemical Reaction Practice

Total questions: 156

Worksheet time: 3hrs 48mins

Name
Class
Date
1.

What is the left part of a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical equation

2.

What is the right part of a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical Equation

3.

What is the total number of atoms present in 5Na3PO4?

a)

5

b)

55

c)

40

d)

8

4.

How many Mn atoms are found in the following compound?

2MnO4

a)

1

b)

2

c)

4

d)

8

5.

What is the little number after an element in a chemical equation called?

Example: H2

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

6.

Is the following equation balanced?

Al + O2 ---> 2Al2O3

a)

YES

b)

NO

7.

How many elements are in C6H12O6?

a)

1

b)

2

c)

3

d)

4

8.

What is the number before a chemical formula called?

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

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

9.

Is the following equation balanced?

2C2H2 + 5O2 ---> 4CO2 + 2H2O

a)

YES

b)

NO

10.

Is the following equation balanced?

4Fe + 3O2 ---> 2Fe2O3

a)

YES

b)

NO

11.

Is the following equation balanced?

NaHCO3 ---> Na2CO3 + H2O + CO2

a)

YES

b)

NO

12.

Which of the following equations are correctly balanced?

a)

12CO2 + H2O ---> C6H12O6 + O2

b)

CO2 + H2O ---> 3C6H12O6 + O2

c)

CO2 + 9H2O ---> C6H12O6 + O2

d)

6CO2 + 6H2O ---> C6H12O6 + 6O2

13.

Balance this equation:

H2 + Cl2 ---> HCl

(a)  

14.

Balanced this equation:

Sb2S3 + O2 ---> Sb + SO2

(a)  

15.

How many Oxygen atoms are in 2SO4?

a)

1

b)

2

c)

4

d)

8

16.
How many Oxygens are in this molecule? 
(OH)2
a)
4
b)
1
c)
2
d)
3
17.
What are the smaller numbers that you CANNOT change in a chemical equation? 
a)
Coefficient
b)
Products
c)
Reactants
d)
Subscript
18.
What are the larger numbers that you CAN CHANGE in a chemical equation? 
a)
Coefficient 
b)
Products
c)
Reactants
d)
Subscripts
19.

Balance this chemical reaction......?   __H2O2 ---->  __H2O + __O2

(a)  

20.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
21.

Which equation is balanced?

a)

PbO2 + 2H2

b)

SO2 + H20 --> H2SO4

c)

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

22.

Balance this equation

_Al +_HCl --> _H2 +_AlCl3

(a)  

23.

What are the coefficients that would properly balance this equation?

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

(a)  

24.

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CO + __Fe2O3--> __Fe + __CO2


(a)  

25.

What are the coefficients that would properly balance this equation?

__AgNO3 + __H2S --> __Ag2S+ __HNO3

(a)  

26.

What are the coefficients that would properly balance this equation?

__Al + __O2--> __Al2O3

(a)  

27.

Balance the the following equation.

__Zn+__HCl -->__ZnCl2 +__H2

(a)  

28.

The numbers needed to balance the equation are:

(a)  

29.

The numbers needed to balance the equation are:

(a)  

30.

The numbers needed to balance the equation are:

(a)  

31.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
32.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
33.
How many Mn atoms are found in the following compound?
3Cr(MnO4)6
a)
3
b)
4
c)
6
d)
18
34.

How many Hydrogen atoms are in 4H2O?

a)

6

b)

8

c)

2

d)

4

35.

How many Magnesium atoms are in 10MgCl2?

a)

10

b)

5

c)

20

d)

12

36.
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.
37.
Which of the following reactions is balanced?
a)
2CH4 + O2 -> CO2 + H2O
b)
CH4 + 2O2 -> CO2 + H2O
c)
CH4 + 2O2 -> CO2 + 2H2O
d)
None of the chemical equations are balanced.
38.
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
39.
Which coefficients balance this equation:
NH3  +  O2 ---->   NO  + H2O
a)
2,3,5,6
b)
5,5,4,6
c)
4,6,4,5
d)
4,5,4,6
40.

What are the coefficients that would properly balance this 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

41.
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
42.

What are the coefficients that would properly balance this equation?

__H2 + __S --> __H2S

a)

1,1 --> 1

b)

2,2 --> 2

c)

1,2 --> 1

d)

1,2 --> 2

43.
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
44.

The numbers needed to balance the equation are:

(a)  

45.

The numbers needed to balance the equation are:

(a)  

46.

Is the following equation balanced?

Al + O2 --> 2Al2O3

a)

Yes!

b)

No!

47.

Is the following equation balanced?

2C2H2 + 5O2 --> 4CO2 + 2H2O

a)

Yes!

b)

No!

48.

Is the following equation balanced?

NaHCO3 --> Na2CO3 + H2O + CO2

a)

Yes!

b)

No!

49.

The coefficient in 3H2O is

a)

6

b)

5

c)

2

d)

3

50.

…N2+…H2 → …NH3\ldots N_2+\ldots H_2\ \rightarrow\ \ldots NH_3  

(a)  

51.

…KClO3 → …KCl + …O2\ldots KClO_3\ \rightarrow\ \ldots KCl\ +\ \ldots O_2  

(a)  

52.

…NaCl + …F2 → …NaF +…Cl2\ldots NaCl\ +\ \ldots F_2\ \rightarrow\ \ldots NaF\ +\ldots Cl_2  

(a)  

53.

…H2 +…O2 → …H2O\ldots H_2\ +\ldots O_2\ \rightarrow\ \ldots H_2O  

(a)  

54.

…CH4 + …O2 → …CO2 + …H2O\ldots CH_4\ +\ \ldots O_2\ \rightarrow\ \ldots CO_2\ +\ \ldots H_2O  

(a)  

55.

…C3H8 + …O2 → …CO2 + …H2O\ldots C_3H_8\ +\ \ldots O_2\ \rightarrow\ \ldots CO_2\ +\ \ldots H_2O  

(a)  

56.

…P + …O2 → …P2O5\ldots P\ +\ \ldots O_2\ \rightarrow\ \ldots P_2O_5  

(a)  

57.

…S8 + …O2 → …SO3\ldots S_8\ +\ \ldots O_2\ \rightarrow\ \ldots SO_3  

(a)  

58.

…Na + …H2O → …NaOH + …H2\ldots Na\ +\ \ldots H_2O\ \rightarrow\ \ldots NaOH\ +\ \ldots H_2  

(a)  

59.

…HNO3 + …NaHCO3 → …NaNO3 + …H2O + …CO2\ldots HNO_3\ +\ \ldots NaHCO_3\ \rightarrow\ \ldots NaNO_3\ +\ \ldots H_2O\ +\ \ldots CO_2  

(a)  

60.

 Balance the following equation: C4H8+O2−−−>CO2+H2OC_4H_8+O_2--->CO_2+H_2O (Type the correct coefficients separated by commas and no spaces example: 1,1,1,1)



(a)  

61.

Balance the following equation:

Ag+S−−−>Ag2SAg+S--->Ag_2S  



(a)  

62.

Balance the equation:

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



(a)  

63.

Balance the following chemical reaction:

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



(a)  

64.

Balance the following equation:

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



(a)  

65.
Balance this equation,            
Al2O3 --> Al + O2 
a)
Cannot be balanced
b)
2Al2O3 --> 2Al+3O2 
c)
2Al2O3--> 4Al+3O2 
d)
3Al2O3--> 2Al+O2 
66.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
67.
Which is the correct formula for:
one carbon (C)
two oxygen (O)
a)
CO2
b)
CO
c)
C2O
d)
2CO
68.
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
69.
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
70.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
71.

In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?

a)

2Mg and O2

b)

2MgO

c)

2Mg and 2MgO

d)

O2 and 2MgO

72.
In a chemical reaction, everything to the rightof the arrow is called ______________.
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
73.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
74.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
75.

In a chemical reaction, the arrow stands for what?

a)

reactants

b)

yields or makes

c)

products

d)

Ask Stephen, he knows

76.

_________________________ are the starting substances in a chemical reaction.

a)

products

b)

reactants

c)

coefficients

d)

subscripts

77.

___________________________ are the new substances that are formed during a chemical reaction.

a)

products

b)

reactants

c)

coefficients

d)

subscripts

78.

The large numbers in front of a chemical formula that are used to balance a chemical equation are called

a)

products

b)

reactants

c)

coefficients

d)

subscripts

79.

The number and type of atoms on each side of a chemical equations must be

a)

equal

b)

different

c)

doubled

d)

tripled

80.

The Law of ____________________________ states that atoms can neither be created nor destroyed in a chemical reaction.

a)

Conservation of Energy

b)

Conservation of Matter

c)

Gravity

d)

Moments

81.

___________________ are numbers that are in a formula and follow the element symbol. They are never changed to balance a chemical equation.

a)

products

b)

reactants

c)

coefficients

d)

subscripts

82.

How many carbon atoms are in the following formula? 2C6H12O6

a)

6

b)

12

c)

18

d)

24

83.

How many atoms of oxygen are in the following formula? Al(NO3)3

a)

1

b)

3

c)

6

d)

9

84.

____Ca + ____O2 → ____CaO

a)

1,2,1

b)

1,1,1

c)

2,1,1

d)

2,1,2

85.

____Na2O + ____H2O → ____NaOH

a)

1,1,1

b)

1,1,2

c)

2,1,1

d)

2,1,2

86.

____Na2CO3 → ____Na2O + ____CO2

a)

1,1,1

b)

1,2,1

c)

2,1,1

d)

2,2,1

87.

____C4H8 + ____O2 → ____CO2 + ____H2O

a)

1,6,4,4

b)

2,3,4,6

c)

4,5,6,7

d)

2,3,2,3

88.

___Fe2O3 + ___HCl → ___FeCl3 + ___H2O

a)

1,4,3,2

b)

1,6,2,3

c)

2,4,6,7

d)

3,4,2,3

89.

____C5H12 + ____O2 → ____CO2 + ____H2O

a)

2,4,5,7

b)

1,4,6,8

c)

1,8,5,6

d)

3,2,5,3

90.

____NH3 + ____O2 → ____NO + ____H2O

a)

2,3,4,5

b)

3,4,5,6

c)

4,5,4,6

d)

4,5,6,7

91.

____HNO3 → ____NO2 + ____H2O + ____O2

a)

4,4,2,1

b)

1,2,4,3

c)

3,4,2,1

d)

4,1,4,1

92.

How many elements are in C6H12O6? (be careful on this one... think periodic table)

a)

6

b)

24

c)

3

d)

12

93.
Two Reactants and One Product
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
94.
One reactant into several products.
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
95.
One element replaces another in a compound.
a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
96.
Always starts with a Hydrocarbon that reacts with oxygen and produces carbon dioxide and water. 
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
97.

The metal ions in two compounds switch.

a)

Synthesis

b)

Combustion

c)

Single Replacement

d)

Double Replacement

98.

What is the type of reaction shown above?

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

99.

Identify the reaction type:

C2H6 + O2 --> CO2 + H2O

a)

Double replacement

b)

Synthesis

c)

Acid base

d)

Combustion

100.

Identify the reaction type for the following equation:

K + F2 --> KF

a)

Double replacement

b)

Single Replacement

c)

Synthesis

d)

Decomposition

101.

Identify the type of reaction:

ZnCl2 + Mg --> Zn + MgCl2

a)

Precipitate

b)

Single Replacement

c)

Double Replacement

d)

Decomposition

102.

PCl5 + ___ H2O → ___ HCl + H3PO4

a)

4, 5

b)

1, 6

c)

3, 8

d)

2,2

103.

__ Al + __ FeO → Al2O2 + __ Fe

a)

1, 1, 2

b)

2,1,2

c)

2, 2, 2

d)

2,4,2

104.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
105.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
106.
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
107.

Which of the following changes would you consider to be a chemical change?

a)

A. Candle wax solidifies when it is cooled.

b)

B. Baking soda is combined with vinegar

c)

C. Ice melts.

d)

D. Paper turned into pieces.

108.

All of the following are chemical reactions EXCEPT ___

a)

A. burning of paper

b)

B. potassium fluoride and calcium nitrate are mixed.

c)

C. sodium hydroxide is added to nitric acid

d)

D. freezing of potassium nitrate solution.

109.

The correct coefficients for the equation are

a)

A. 2, 2, 3

b)

B. 3, 2, 2

c)

C. 2, 3, 2

d)

D. 2, 1, 3

110.

Balancing a chemical equation involves ____

a)

A. adjusting the subscripts

b)

B. adjusting both subscripts and coefficients

c)

C. adjusting the coefficients

d)

D. adjusting the masses of reactants and products

111.

What is the meaning of the illustration as used in a chemical equation?

a)

A. yields

b)

B. reacts with

c)

C. heat is applied

d)

D. gas

112.

Which of these is incorrect interpretation of this balanced equation?

a)
b)
c)
d)
113.

In a chemical reaction, the mass of the products is _____

a)

A. less than the mass of the reactants.

b)

B. greater than the mass of the reactants.

c)

C. equal to the mass of the reactants.

d)

D. undetermined

114.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
115.
Is this balanced?...
Fe + S --> FeS
a)
YES!
b)
NO!
116.
Is this balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
NO!
117.
Balance this equation...
Sb2S3 + O2 --> Sb + SO2
a)
It is balanced
b)
Sb2S3 + 3O2 --> 2Sb + 3SO2
c)
Sb2S3 + O2 --> 2Sb + SO2
d)
I don't know...Oh well!
118.
Which coefficients balance this equation:
NH3  +  O2 ---->   NO  + H2O
a)
2,3,5,6
b)
5,5,4,6
c)
4,6,4,5
d)
4,5,4,6
119.

Which type of chemical reaction has two or more reactants to make one product?

a)

combustion

b)

single displacement

c)

double displacement

d)

synthesis

e)

decomposition

120.

Identify the following chemical reaction.

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

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

121.

Identify the following chemical reaction.

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

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

122.

Identify the following chemical reaction.

Pb + FeSO4 ----> PbSO4 + Fe

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

123.

What reaction has the following general formula:

AB --> A + B

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

124.

What reaction has the following general formula:

A + CD --> C + AD

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

125.

What reaction has the following general formula:

AB + CD --> CB + AD

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

126.

What reaction has the following general formula:

A + B --> AB

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

127.

Which chemical reaction always starts with a hydrocarbon that reacts with oxygen and produces carbon dioxide and water?

a)

Decomposition

b)

Synthesis

c)

Combustion

d)

Single Replacement

128.
In a chemical reaction, everything to the right of the arrow is called ______________.
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
129.

What is a synthesis reaction?

a)

When a complex substance breaks down into new and simpler substances

b)

When there is one substance replacing another substance

c)

When simpler substances combine together and react to form a new and complex substance

d)

When two substances are switched after a chemical reaction occurs

130.

What is a decomposition reaction?

a)

When a complex substance breaks down into new and simpler substances

b)

When there is one substance replacing another substance

c)

When simpler substances combine together and react to form a new and complex substance

d)

When two substances are switched after a chemical reaction occurs

131.

What is a combustion reaction?

a)

When chemicals react with fire.

b)

An explosive reaction.

c)

fuel + oxygen --> water + carbon dioxide

d)

fuel + carbon dioxide --> water + oxygen

132.

What type of reaction is this?

a)

a synthesis reaction

b)

a decomposition reaction

c)

a single replacement reaction

d)

a double replacement reaction

e)

a combustion reaction

133.

What type of reaction is this?

a)

a synthesis reaction

b)

a decomposition reaction

c)

a single replacement reaction

d)

a double replacement reaction

e)

a combustion reaction

134.

What type of reaction is this?

a)

a synthesis reaction

b)

a decomposition reaction

c)

a single replacement reaction

d)

a double replacement reaction

e)

a combustion reaction

135.
2 NaBr + 1 Ca(OH)2 ----> 1 CaBr2 + 2 NaOH
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
136.
2 NH3+ 1 H2SO4 ----> 1 (NH4)2SO4
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
137.
3 Pb + 2 H3PO4 ----> 3 H2 + 1 Pb3(PO4)2
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
138.
1 Li3N + 3 NH4NO3 ----> 3 LiNO3 + 1 (NH4)3N
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
139.
3 HBr + 1 Al(OH)3 ----> 3 H­2O + 1 AlBr3
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
140.
Na3PO4 + 3 KOH ----> 3 NaOH + K3PO4
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
141.
Pb + FeSO4 ----> PbSO4 + Fe
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
142.
CaCO3 ----> CaO + CO2
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
143.
MgCl2 + Li2CO3 ----> MgCO3 + 2 LiCl
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
144.
2 RbNO3 + BeF2 ----> Be(NO3)2 + 2 RbF
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
145.
2 NO2 ----> 2 O2 + N2
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
146.

What type of reaction involves one element replacing another element in a compound?

a)

Single Replacement Reaction

b)

Double Replacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

147.

What type of reaction is this?

a)

single replacement

b)

double replacement

c)

synthesis

d)

decomposition

148.

Identify the following chemical reaction.

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

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

149.

Which phrase describes what happens to atoms in a chemical reaction?

a)

never lost or gained, just rearranged

b)

sometimes lost, never rearranged

c)

sometimes lost, gained, or rearranged

d)

lost or gained, never rearranged

150.
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
151.
Which of the following examples shows that a chemical reaction has occurred? 
a)
A rock breaks into smaller pieces when it is struck with a hammer.
b)
Rust forms on a hammer that has been left outside to long. 
c)
A cup of water turns pink when a few drops of red food coloring are added. 
d)
A solid is formed when heat is removed from a sample of water. 
152.
Hydrogen peroxide breaks down to form water and oxygen gas. Which observation is evidence that a chemical reaction has occurred?
a)
The mass of the solution remains the same.
b)
 Phase changes are observed.
c)
 The color of the solution remains clear.
d)
The temperature of the solution increases. 
153.
Which of the following is an example that includes evidence of a chemical reaction?
a)
A sample of zinc is placed in water and it settles to the bottom
b)
A solid block of ice is heated and it completely melts into a liquid. 
c)
Sugar that is burned gives off an odor and turns brown and then black.
d)
A tomato is placed into a blender and chopped up into smaller pieces.
154.
Evidence of a chemical reactions is anything that shows - 
a)
a new substance has formed
b)
a solid dissolved in a liquid
c)
interaction between 2 gases
d)
a change in the state of matter
155.
Which of the following is NOT evidence that that a chemical reaction has occurred?
a)
produces light/heat
b)
production of a gas
c)
formation of a precipitate
d)
melting
156.

In a ___________change, a substance changes into a different substance.

a)

Physical

b)

Chemical

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