Free Printable Balancing Chemical Equations

1.

Which problem is balanced?
(Check ALL answers)

a)

PbO₂ + 2H₂

b)

SO₂ + H₂0 --> H₂SO₄

c)

2Na + 2H₂O --> 2NaOH + H₂

2.

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

3.

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

a)

yes

b)

no

4.

Is the following equation balanced?
4Fe + 3O₂ --> 2Fe₂O₃

a)

yes

b)

no

5.

Is the following reaction balanced?
2CH₃OH + 3O₂ --> 2CO₂ + 4H₂O

a)

yes

b)

no

6.

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

7.

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

8.

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

9.

What is the total number of atoms present in 5Na₃PO₄

a)

5

b)

40

c)

55

d)

8

10.

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

Example: H₂

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

11.

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

12.

How many Oxygens are in this molecule?
(OH)₂

a)

4

b)

1

c)

2

d)

3

13.

What are the smaller numbers that you CANNOT change in a chemical equation?

a)

Coefficient

b)

Products

c)

Reactants

d)

Subscript

14.

What are the larger numbers that you CAN CHANGE in a chemical equation?

a)

Coefficient

b)

Products

c)

Reactants

d)

Subscripts

15.

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

16.

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.

17.

CaCO₃ represents a chemical

a)

Symbol

b)

Formula

c)

Subscript

d)

Reaction

18.

$FeS\ +\ HCl\ \rightarrow\ FeCl_2\ +\ H_2S\$ is a ________ chemical equation

a)

Balanced

b)

Unbalanced

19.

$CH_4\ +2O_2\ \rightarrow\ CO_2\ +2H_2O$ is a ________ chemical equation

a)

Balanced

b)

Unbalanced

20.

$FeCl_3\ +Na_3PO_4\ \rightarrow\ NaCl\ +FePO_4$ is a ________ chemical equation

a)

Balanced

b)

Unbalanced

21.

$FeCl_3\ +Na_3PO_4\ \rightarrow\ 3NaCl\ +FePO_4$ is a ________ chemical equation

a)

Balanced

b)

Unbalanced

22.

$HCl\ +\ NaOH\ \rightarrow\ NaCl\ +H_2O$ is a ________ chemical equation

a)

Balanced

b)

Unbalanced

23.

$HCl\ +\ 4NaOH\ \rightarrow\ NaCl\ +H_2O$ is a ________ chemical equation

a)

Balanced

b)

Unbalanced

24.

A ________ chemical equation contains an equal number of reactant and product atoms.

a)

Balanced

b)

Unbalanced

25.

An ________ chemical equation contains an unequal number of reactant and product atoms.

a)

Balanced

b)

Unbalanced

Balancing Chemical Equations

Total questions: 25

Worksheet time: 2hrs 23mins

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