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Balancing Chemical Equations Review

Total questions: 45

Worksheet time: 4hrs 45mins

Name
Class
Date
1.
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. 

2.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)

Reactants

b)

Products 

c)

Yields 

d)

Chemical Equation 

3.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)

Reactants

b)

Products 

c)

Yields 

d)

Chemical Equation 

4.
What is the total number of atoms present in 5Na3PO4
a)

5

b)

40

c)

55

d)

8

5.
What is the little number after an element in a chemical equation called.
Example: H2
a)

Coefficient 

b)

Subscript

c)

Atom

d)

Equation

6.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)

Yes!

b)

No!

7.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)

yes

b)

no

8.
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

9.
Is the following reaction balanced?
NaHCO3 --> Na2CO3 + H2O + CO2
a)

yes

b)

no

10.

Balance the following equation:

___ H2+ ___ O2→___ H2O

a)

1, 1, 3

b)

2, 2, 2

c)

1, 2, 1

d)

2,1, 2

11.

Balance the following equation:

___ Mg+ ___ O2→___ MgO

a)

1, 1, 3

b)

2, 1, 2

c)

1, 2, 1

d)

2, 2, 2

12.

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

13.
How many Mn atoms are found in the following compound?
3Cr(MnO4)6
a)

3

b)

4

c)

6

d)

18

14.
Balance this equation:
 2Li + Cl2 -> LiCl
a)

2Li + Cl2 -> 4LiCl2

b)

2Li + Cl2 -> LiCl2

c)

2Li + Cl2 -> 2LiCl

15.
Name the part in red:

H2 + O2 -> H2O
a)

Coefficient

b)

Product

c)

Yield

d)

Subscript

16.

The coefficient in 3H2O is

a)

6

b)

5

c)

2

d)

3

17.
How many atoms of carbon (C) are in C6H12O6?
a)

3

b)

6

c)

12

d)

24

18.

How many Sodium (Na) are in 3NaCl?

a)

1

b)

3

c)

6

19.
How many Hydrogen are in 4H2O?
a)

6

b)

8

c)

2

d)

4

20.

How many ELEMENTS are in C6H12O6?

a)

1

b)

2

c)

3

d)

4

21.

How many Oxygen atoms are in SO4?

a)

1

b)

2

c)

4

d)

8

22.
How many phosphorus atoms are in PO4?
a)
1
b)
2
c)
3
d)
4
23.
This is used to represent the amount of each atom in a molecule. What is the arrow pointing to?
a)
Exponent
b)
Coefficient
c)
Molecule
d)
Subscript
24.

What is the arrow in a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Reactant

b)

Product

c)

Yields

25.
What is the part of the chemical equation in green called? 
Fe + S --> FeS
a)

products

b)

reactants

c)

yield

d)

chemical formula

26.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
27.
Which is the correct formula for:
one carbon (C)
two oxygen (O)
a)
CO2
b)
CO
c)
C2O
d)
2CO
28.
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
29.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
30.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
31.

In a chemical reaction, the arrow stands for what?

a)

reactants

b)

yields or makes

c)

products

d)

Ask Stephen, he knows

32.

Chemical Reaction

a)

a substance formed as a result of a chemical reaction

b)

a change in matter that produces one or more new substances

c)

the process in which substances undergo chemical changes that result in the formation of new substances

d)

a substance that enters into a chemical reaction

33.

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

a)

5

b)

55

c)

40

d)

8

34.

Choose the coefficients that will correctly 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

35.
Why is the following chemical equation not balanced?
H2 + O2 --> H2O
a)
each side of the equation has a different number of oxygen atoms
b)
each side of the equation has a different number of hydrogen atoms
c)
each side has the same mass
36.

The subscript represents the number of ____________ in a chemical formula.

a)

reactants

b)

products

c)

atoms

d)

molecules

37.

Is the following equation balanced or unbalanced?   6CO2 + 6H2O  →  C6H12O6 + 6O26CO_2\ +\ 6H_2O\ \ \rightarrow\ \ C_6H_{12}O_6\ +\ 6O_2  

a)

balanced

b)

unbalanced

38.

Is the following equation balanced or unbalanced?   CH4 + O2  →  CO2 + 2H2OCH_4\ +\ O_2\ \ \rightarrow\ \ CO_2\ +\ 2H_2O  

a)

balanced

b)

unbalanced

39.

Is the following equation balanced or unbalanced?   SnO2 + 2H2  →  Sn + 2H2OSnO_2\ +\ 2H_2\ \ \rightarrow\ \ Sn\ +\ 2H_2O  

a)

balanced

b)

unbalanced

40.

Sodium and Bromine will make a _____ bond

a)

Ionic

b)

Hydrogen

c)

Covalent

d)

Exploding

41.

 

NaCl

a)

metallic

b)

covalent

c)

Ionic

42.

Hydrogen and Chlorine will from a ____ bond

a)

Unique

b)

bestie

c)

Covalent

d)

Ionic

43.

Beryllium and sulfur will form a ____ bond

a)

Covalent

b)

Metallic

c)

Ionic

d)

Unique

44.

MgO for a _____ Bond.

a)

Ionic

b)

Metallic

c)

Covalent

45.

Water, H2O

a)

Ionic

b)

Covalent

c)

Water

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