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Practice: Chemical Equations

Total questions: 85

Worksheet time: 4hrs 15mins

Name
Class
Date
1.

How many HCl molecules do you need to balance this equation?

2Mg + ​ (a)   HCl ---> 2MgCl2 + 2H2

Choose from the below words
4
1
2
3
2.

What coefficient should be used to make the following equation balanced?

N2+O2--> __?__NO

a)

1

b)

2

c)

3

d)

4

3.

Drag and drop the coefficients that balance this equation 2 FeFe   + ​ (a)   Cl2Cl_2  ---->  ​ (b)     FeCl3FeCl_3  

Choose from the below words
3
2
4.

Balance this equation ​ (a)   N2 + ​ (b)   H2 --> ​ (c)   NH3

Choose from the below words
1
3
2
5.

Balance this equation. _CF4 + _Br2 → _CBr4 + _F2

a)

3,1,2,1

b)

1,2,1,2

c)

2,2,2,2

6.

According to the Law of Conservation of Mass (Matter), Matter cannot be ​ (a)   or ​ (b)   , it can only be ​ (c)   . This means however many atoms of an element we have before a reaction must be ​ (d)   to the number after a reaction.

Choose from the below words
created
destroyed
changed
equal
7.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
8.
What is the little number after an element in a chemical equation called.
Example: H2
a)

Coefficient 

b)

Subscript

c)

Atom

d)

Equation

9.
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

10.

In 3P2O5, there are ​ (a)   phosphorus (P) atoms and ​ (b)   oxygen (O) atoms.

Choose from the below words
6
15
8
3
12
21
11.

What's unbalanced about this equation? 

Al + O2 --> Al2O3

a)

Oxygen (O) only

b)

Aluminum (Al) only

c)

Both oxygen and aluminum

d)

Nothing; it is balanced.

12.

What is wrong with how this student balanced the equation?

Original equation: Ag + O2 ---> Ag2O

Solution: Ag + O2 ---> 2Ag2O

a)

They changed the molecular structure of the products/reactants.

b)

The silver (Ag) still isn't balanced.

c)

The oxygen (O) still isn't balanced.

d)

They left out the reactants.

13.

Balance this equation:

​ (a)   Fe + ​ (b)   O2 --> ​ (c)   Fe2O3

Choose from the below words
4
3
2
1
0
14.

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.

15.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number in front of a chemical formula.
c)
The number in between the chemical symbols.
d)
The number behind a chemical formula.
16.
What is the part of the chemical equation in green called? 
Fe + S --> FeS
a)
products
b)
reactants
c)
yield
d)
chemical formula
17.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
18.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
19.
Which problem is balanced?
(Check ALL answers)
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
20.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
21.
Element or compound?
H2O
a)
element
b)
compound
22.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
23.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
24.

Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe

a)

yes

b)

no

25.

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

26.
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. 
27.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
28.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
29.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
30.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
31.
Is the following equation balanced?
4Fe + 3O2 --> 2Fe2O3
a)
yes
b)
no
32.
Is the following reaction balanced?
NaHCO3 --> Na2CO3 + H2O + CO2
a)
yes
b)
no
33.
Is the following reaction balanced?
2CH3OH + 3O2 --> 2CO2 + 4H2O
a)
yes
b)
no
34.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
35.

Which equation is balanced?

a)

PbO2 + 2H2

b)

SO2 + H20 --> H2SO4

c)

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

36.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
37.

What law governs the balancing of chemical equations?

a)

Law of Energy

b)

Law of Conservation of Matter/Mass

c)

Law of Gravity

d)

Law of Matter Movement

38.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
39.

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

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?

__AgNO3 + __H2S --> __Ag2S+ __HNO3

a)

2,1 --> 1,2

b)

1,2 --> 1,1

c)

1,2 --> 1,2

d)

1,2 --> 2,1

43.

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

44.

What are the coefficients that would properly balance this equation?

__Al + __O2--> __Al2O3

a)

4,1 --> 2

b)

4,3 --> 4

c)

3,4 --> 1

d)

4,3 --> 2

45.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
46.

Determine the coefficients to make the following equation balanced?

__N2 + __O2--> __NO

a)

1, 1, 1

b)

1, 1, 2

c)

2, 2, 2

d)

1, 2, 2

47.

Determine the coefficients to balance the 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

48.

Balance the the following 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

49.
Which number should go in the blank?
Mn + _ HNO3 → Mn(NO3)2 + H2
a)
1
b)
2
c)
3
d)
0
50.
Which number should go in the blank?
Al(NO3)3 + _  NaOH -> Al(OH)3 + 3 NaNO3
a)
1
b)
2
c)
3
d)
0
51.
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
52.
The numbers needed to balance the equation are:
a)
2, 7, 6, 4
b)
2, 1, 3, 2
c)
1, 1, 3, 2
d)
2, 3, 1, 3
53.
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
54.

The Law of Conservation of Matter

a)

tells how many atoms of an element are contained in one molecule or formula unit.

b)

the starting materials in a chemical reaction

c)

the new substances that are formed in a chemical reaction

d)

A law stating that atoms are not created or destroyed during a chemical reaction.

55.

Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe

a)

yes

b)

no

56.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
57.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
58.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
59.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
60.
How many Mn atoms are found in the following compound?
3Cr(MnO4)6
a)
3
b)
4
c)
6
d)
18
61.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
62.
Balance this equation:
 2Li + Cl2 -> LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li + Cl2 -> 2LiCl
63.
Name the part in red:

H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Yield
d)
Subscript
64.
Is the following equation balanced or unbalanced ? 
Al + O2 --> Al2O3
a)
Balanced
b)
Unbalanced
65.

Which of the coefficients could be used to balance this equation?

__Ag2O →__ Ag +___O2

a)

2,4,1

b)

1,1,1

c)

2,1,2

d)

2,2,2

66.
How many Oxygens are in this molecule? 
(OH)2
a)
4
b)
1
c)
2
d)
3
67.
What are the smaller numbers that you CANNOT change in a chemical equation? 
a)
Coefficient
b)
Products
c)
Reactants
d)
Subscript
68.
What are the larger numbers that you CAN CHANGE in a chemical equation? 
a)
Coefficient 
b)
Products
c)
Reactants
d)
Subscripts
69.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
70.
Pb(NO3)2  +  KI --> PbI2 + KNO3
What type of reaction is this? 
a)
Synthesis 
b)
Decomposition 
c)
Single Replacement
d)
Double Replacement 
71.
__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
72.
What type of reaction is this?  
__H2O2 ---->  __H2O + O2
a)
Synthesis
b)
Decomposition 
c)
Single Replacement
d)
Combustion 
73.
What law governs the balancing of chemical equations? 
a)
Law of Energy
b)
Law of Conservation of Matter/Mass
c)
Law of Gravity
d)
Law of Matter Movement 
74.
Balance this chemical reaction......?  
__H2O2 ---->  __H2O + O2
a)
2H2O2  //  2H2O
b)
1H2O2  //  2H2O
c)
2H2O2  //  1H2O
d)
H2O2  //  2H2O
75.
Why is it called the Law of Conservation of Matter/Mass? 
a)
Energy is created and destroyed 
b)
Energy is never created, nor destroyed-- it always moves 
c)
Energy moves between particles
d)
Energy stops moving at the end of the universe 
76.

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

a)

Balanced

b)

Unbalanced

77.

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

a)

Balanced

b)

Unbalanced

78.

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

a)

Balanced

b)

Unbalanced

79.

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

a)

Balanced

b)

Unbalanced

80.

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

a)

Balanced

b)

Unbalanced

81.

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

a)

Balanced

b)

Unbalanced

82.

In order for an equation to be balanced, there must be ...

a)

an equal amount of atoms on both sides

b)

a greater mass on the product side

c)

a greater mass on the reactant side

d)

elements with the same atomic # on both sides

83.

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

84.

Which coefficients would balance this chemical equation? _K + _Cl2 ---> _KCl

a)

1,1,1

b)

1,2,2

c)

1,1,2

d)

2,1,2

85.

Which of the following equations is balanced?

a)

P4 + 3O2 ---> 2P2O3

b)

N4 + 3F2 ---> 2NF3

c)

2LiF + Br2 ---> 2LiBr + F4

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