Free Printable Chemistry: Balancing Equations

Worksheets

Chemistry: Balancing Equations

Total questions: 25

Worksheet time: 1hrs 19mins

Name

Class

Date

What is a coefficient?

The small number on the right of the chemical symbol.

The large number to the left of a formula.

Which side of a chemical equation is the product side?

Left (before the arrow)

Right (after the arrow)

Which side of a chemical equation is the reactant side?

Left (before the arrow)

Right (after the arrow)

Which problem is balanced?

PbO₂ + 2H₂

SO₂ + H₂0 --> H₂SO₄

2Na + 2H₂O --> 2NaOH + H₂

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

Yes

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

Coefficient

Subscript

Atom

Equation

What is the arrow in a chemical equation...
H_{2 +}O --> H₂O

Reactants

Products

Produces

Chemical Equation

Balance this equation
_Zn+_HCl-->_ZnCl₂+_H₂

1,1,2,1

1,1,1,2

1,2,1,1

2,1,1,1

Balance this equation.
_Mg + _Cl₂--> _MgCl₂

1, 2,1

already balanced

2,1,1

1,1,2

10.

What does the Law of Conservation of Mass state?

Matter cannot be gained or lost in a chemical reaction.

Matter can only be lost in a chemical reaction.

Matter can only be gained in a chemical reaction.

Matter can be gained and lost in a chemical reaction.

11.

Is this balanced?...
Fe + S --> FeS

YES!

NO!

12.

KNO₃ --> KNO₂ + O₂
What coefficients are needed to balance the reaction?

2, 2, 1

2, 3, 2

1, 2, 2

1, 3, 1

13.

Balance this equation-
__P₄+ __O₂--> __P₂O₃

it is already balanced

2, 1, 3

1, 2, 3

1, 3, 2

14.

Balance this equation.
_Mg + _Cl₂--> _MgCl₂

1, 2,1

already balanced

2,1,1

1,1,2

15.

Balance this equation.
_CH₄ + _O₂--> _CO₂+ _H₂O

1,2,1,1

2,1,2,1

1,2,1,2

0,2,0,2

16.

Fill in the blanks with coefficient:

PCl₅+_ H₂O→_ HCl+H₃PO₄

4, 5

1, 6

3, 8

2,2

17.

Which equation is balanced?

PbO₂ + 2H₂--> H₂SO₄

SO₂ + H₂0 --> H₂SO₄

2Na + 2H₂O --> 2NaOH + H₂

2Na + 2H₂O --> 2NaOH + H

18.

Balance this equation
_Zn+_HCl-->_ZnCl₂+_H₂

1,1,2,1

1,1,1,2

1,2,1,1

2,1,1,1

19.

Balance this equation.
_Mg + _Cl₂--> _MgCl₂

1, 2,1

already balanced

2,1,1

1,1,2

20.

Balance this equation:
P₄+O₂--> P₂O₃

3 P₄+ O₂--> 2 P₂O₃

P₄+ O₂--> 2 P₂O₃

P₄+ 3 O₂--> 2 P₂O₃

P₄+ 2 O₂--> 3 P₂O₃

21.

2NaClO₃ (s) → 2NaCl (s) + 3O₂ (g)

12.00 moles of NaClO₃ will produce how many grams of O₂?

NaClO₃ = 106.44 g/mol ; O₂ = 32.00 g/mol

256 g of O₂

576 g of O₂

288 g of O₂

384 g of O₂

22.

From the reaction: B₂H₆ + 3O₂ -->2 HBO₂ + 2 H₂O

What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

B₂H₆ = 27.68 g/mol

13.8 g O₂

3.91 mol of O₂

125 g O₂

41.7 g O₂

23.

Balance this reaction: ____ RbNO₃ + ____ BeF₂ ----> ____ Be(NO₃)₂ + ____ RbF

1,1,1,1

1,2,1,1

2,1,1,2

2,1,2,1

24.

For the reaction represented by the equation Cl₂ + 2KBr → Br₂ + 2KCl, how many grams of potassium chloride can be produced from 356 grams potassium bromide? (atomic masses: K=39 Cl=35.5 Br=80)

749 g

223 g

479 g

814 g

25.

Use the following equation: 2NaOH(aq) + H₂SO₄(aq) --> 2H₂O(l) + Na₂SO₄(aq) How many grams of sodium sulfate (MW 142g/mol) will be formed if you start with 200 grams of sodium hydroxide (MW 40g/mol) ?

150 g Na₂SO₄

593 g Na₂SO₄

330 g Na₂SO₄

355 g Na₂SO₄

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Chemistry: Balancing Equations

Total questions: 25

Worksheet time: 1hrs 19mins

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