Worksheet: Balancing Chemical Equations

In this worksheet, we will practice balancing chemical equations and the shortcuts that can be made when balancing multiatom groups.

Q1:

Write a balanced molecular equation for the reaction of aluminum with oxygen.

  • A 4 A l + 3 O 2 A l O 2 2 3
  • B A l + O A l O 2 2
  • C A l + O A l O
  • D 2 A l + O 2 A l O 2
  • E 2 A l + 3 O A l O 2 3

Q2:

Write a balanced molecular equation for the reaction of silicon dioxide with hydrogen fluoride.

  • A S i O + 4 H F S i + 2 F + 2 H O 2 2 2
  • B 2 S i O + 2 H F 2 S i F + H O 2 2
  • C S i O + 2 H F S i + F + H O 2 2
  • D 2 S i O + 4 H F 2 S i F + 3 H O 2 4 2
  • E S i O + 4 H F S i F + 2 H O 2 4 2

Q3:

Write a balanced molecular equation for the reaction of water with sodium metal.

  • A N a + 2 H O N a O H + 2 H 2 2
  • B 3 N a + 3 H O 3 N a O H + 2 H 2 2
  • C 2 N a + H O 2 N a O H + 2 H 2 2
  • D 2 N a + 2 H O 2 N a O H + H 2 2
  • E N a + H O N a O H + H 2 2

Q4:

Write a balanced molecular equation for the reaction of magnesium with oxygen.

  • A M g + 2 O M g O 2
  • B 2 M g + O 2 M g O 2 2
  • C M g + O M g O 2 2
  • D M g + O M g O
  • E 2 M g + O 2 M g O 2

Q5:

Which of the following is a balanced chemical equation?

  • A 2 N a + 2 H O 2 N a O H + H 2 2
  • B 2 N a + H O 2 N a O H + H 2 2
  • C N a + 2 H O N a O H + 2 H 2 2
  • D N a + H O N a O H + H 2 2
  • E N a + 2 H O N a O H + H 2 2

Q6:

Which of the following is a balanced chemical equation?

  • A 8 F e + 4 O 4 F e O 2 2 3
  • B 4 F e + 2 O 2 F e O 2 2 3
  • C 2 F e + O F e O 2 2 3
  • D 4 F e + 3 O 2 F e O 2 2 3
  • E 8 F e + 5 O 4 F e O 2 2 3

Q7:

Give a balanced chemical equation for the reaction of hydrogen and iodine to form hydrogen iodide.

  • A H + I H I 2 2
  • B H + 2 I 2 H I 2 2
  • C 2 H + I 4 H I 2 2
  • D H + I 2 H I 2 2
  • E 2 H + I 2 H I 2 2

Q8:

Which of the following is a balanced chemical equation?

  • A 3 C u + 8 H N O 3 C u ( N O ) + 4 H O + 2 N O 3 3 2 2
  • B C u + 4 H N O C u ( N O ) + 2 H O + 2 N O 3 3 2 2
  • C 2 C u + 6 H N O 2 C u ( N O ) + 3 H O + 2 N O 3 3 2 2
  • D 3 C u + 1 0 H N O 3 C u ( N O ) + 5 H O + 4 N O 3 3 2 2

Q9:

Which of the following is a balanced chemical equation?

  • A 2 P t C l P t + + 2 C l 4 2
  • B 2 P t C l P t + + 4 C l 4 2
  • C P t C l P t + + 4 C l 4 2
  • D P t C l 2 P t + + 2 C l 4 2
  • E P t C l P t + + 2 C l 4 2

Q10:

Which of the following is a balanced chemical equation?

  • A P + 3 C l 4 P C l 4 2 3
  • B P + 6 C l 2 P C l 4 2 3
  • C P + 6 C l 4 P C l 4 2 3
  • D P + 4 C l 2 P C l 4 2 3
  • E P + 5 C l 4 P C l 4 2 3

Q11:

Which of the following is a balanced chemical equation?

  • A 2 ( N H ) C r O 2 C r O + 2 N + 5 H O 4 2 2 7 2 3 2 2
  • B ( N H ) C r O C r O + N + 4 H O 4 2 2 7 2 3 2 2
  • C ( N H ) C r O 2 C r O + 2 N + 4 H O 4 2 2 7 2 3 2 2
  • D 2 ( N H ) C r O 2 C r O + N + 8 H O 4 2 2 7 2 3 2 2
  • E ( N H ) C r O 2 C r O + 2 N + 3 H O 4 2 2 7 2 3 2 2

Q12:

Write a balanced molecular equation for the complete reaction of phosphoric acid with sodium hydroxide.

  • A H P O + 2 N a O H N a P O + 2 H O 2 4 2 4 2
  • B H P O + N a O H N a P O + 2 H O 3 4 4 2
  • C H P O + N a O H N a P O + 2 H O 3 3 3 2
  • D H P O + 3 N a O H N a P O + 3 H O 3 3 3 3 2
  • E H P O + 3 N a O H N a P O + 3 H O 3 4 3 4 2

Q13:

Write a balanced molecular equation for the complete combustion of butane.

  • A C H + 6 O 4 C O + 4 H O 4 1 0 2 2 2
  • B 2 C H + 1 5 O 8 C O + 1 4 H O 4 1 0 2 2 2
  • C 2 C H + 1 3 O 8 C O + 1 0 H O 4 1 0 2 2 2
  • D 2 C H + 1 1 O 8 C O + 6 H O 4 1 0 2 2 2
  • E C H + 6 O 4 C O + 5 H O 4 1 0 2 2 2

Q14:

Write a balanced molecular equation describing the thermal decomposition of calcium carbonate.

  • A C a ( C O ) C a O + 2 C O 3 2 2 2
  • B 2 C a C O 2 C a O + C O 3 2
  • C C a ( C O ) C a O + 4 C O 3 2 2
  • D C a C O C a O + C O 3
  • E C a C O C a O + C O 3 2

Q15:

Which of the following is a balanced chemical equation?

  • A 2 C H O H + 3 O 2 C O + 2 H O 3 2 2 2
  • B 2 C H O H + 4 O 2 C O + 3 H O 3 2 2 2
  • C C H O H + 2 O C O + 2 H O 3 2 2 2
  • D C H O H + O C O + 2 H O 3 2 2 2
  • E 2 C H O H + 3 O 2 C O + 4 H O 3 2 2 2

Q16:

Which of the following is a balanced chemical equation?

  • A P C l + 2 H O P O C l + 4 H C l 5 2 3
  • B 2 P C l + H O 2 P O C l + 4 H C l 5 2 3
  • C P C l + 3 H O P O C l + H C l 5 2 3
  • D P C l + H O P O C l + 4 H C l 5 2 3
  • E P C l + H O P O C l + 2 H C l 5 2 3

Q17:

Ammonium nitrate is produced from nitrogen in two reaction steps.

Write a balanced molecular equation for the first step, a reduction–oxidation reaction.

  • A 2 N + 6 H O 4 N H + 3 O 2 2 3 2
  • B N + 6 H C l 2 N H + 3 C l 2 3 2
  • C N + 3 H 2 N H 2 2 3
  • D N + 3 H S 2 N H + S 2 2 3
  • E N + 3 H O 2 N H + 3 O 2 2 2 3 2

Write a balanced molecular equation for the second step, an acid–base reaction.

  • A N H + H N O N H N O 3 2 4 2
  • B N H + H N O N H N O 3 3 4 3
  • C 2 N H + 6 N a O H N H N O + 3 N a O + 4 H 3 4 3 2 2
  • D 2 N H + 2 H O N H N O + 3 H 3 2 4 2 2
  • E N H + N a N O + H O N H N O + N a O H 3 3 2 4 3

Q18:

Gallium(III) bromide can be produced by the reaction of gallium with bromine. Write a balanced molecular equation for this reaction, including state symbols.

  • A G a ( ) + B r ( ) G a B r ( ) l l s 2 2
  • B 4 G a ( ) + 3 B r ( ) 2 G a B r ( ) l l s 2 2 3
  • C 3 G a ( ) + 4 B r ( ) 3 G a B r ( ) l l s 2 3
  • D 2 G a ( ) + 3 B r ( ) 2 G a B r ( ) l l s 2 3
  • E 6 G a ( ) + 4 B r ( ) 3 G a B r ( ) l l l 2 2 3

Q19:

The appearance of fireworks often results from the decomposition of barium nitrate or potassium chlorate.

Write a balanced equation for the decomposition of barium nitrate into barium oxide, nitrogen, and oxygen.

  • A 4 B a N O 2 B a O + 4 N + 5 O 3 2 2
  • B 2 B a ( N O ) 2 B a O + 2 N + 5 O 3 2 2 2
  • C B a ( N O ) B a O + N + 3 O 3 2 2 2
  • D 2 B a N O B a O + N + 3 O 3 2 2 2
  • E 2 B a ( N O ) 2 B a O + 4 N + 6 O 3 2 2

Write a balanced equation for the decomposition of potassium chlorate into potassium chloride and oxygen.

  • A 3 K C l O 3 K C l + 2 O 2
  • B 2 K C l O 2 K C l + O 2
  • C 2 K C l O 4 K C l + 3 O 2 2 3 2
  • D 2 K C l O 2 K C l + 3 O 3 2
  • E 3 K C l O 3 K C l + 4 O 3 2

Q20:

Which of the following is a balanced chemical equation?

  • A 3 N + 5 O 3 N O 2 2 2 5
  • B 2 N + 5 O 2 N O 2 2 2 5
  • C 3 N + 7 O 3 N O 2 2 2 5
  • D 2 N + 3 O 2 N O 2 2 2 5
  • E N + 3 O N O 2 2 2 5

Q21:

Which of the following is a balanced chemical equation?

  • A N H N O N + O + 2 H O 4 3 2 2 2
  • B 2 N H N O N + O + 4 H O 4 3 2 2 2
  • C N H N O N + 3 O + H O 4 3 2 2 2
  • D 2 N H N O 2 N + 3 O + 2 H O 4 3 2 2 2
  • E 2 N H N O 2 N + O + 4 H O 4 3 2 2 2

Q22:

Write a balanced chemical equation, including state symbols, for the electrolysis of molten potassium iodide at 700C.

  • A 2 K I ( ) 2 K ( ) + I ( ) . l l s 2
  • B 2 K I ( ) 2 K ( ) + I ( ) . l s g 2
  • C 2 K I ( ) 2 K ( ) + I ( ) . l l g 2
  • D K I ( ) K ( ) + I ( ) . l s g
  • E K I ( ) K ( ) + I ( ) . l s s

Q23:

What is the balanced chemical equation for the complete combustion of hydrazine (NH)24? One product is nitrogen.

  • A N H + O N + 2 H O 2 4 2 2 2
  • B N H + O N + H O 2 4 2 2 2
  • C N H + O 2 N + 2 H O 2 4 2 2
  • D N H + 2 O N + 4 H O 2 4 2 2 2
  • E N H + O 2 N + H O 2 4 2 2

Q24:

What is the balanced chemical equation for the complete combustion of methane (CH)4?

  • A 2 C H + 3 O 2 C O + 4 H O 4 2 2
  • B C H + 2 O C O + H O 4 2 2 2
  • C C H + 2 O C O + 2 H O 4 2 2 2
  • D C H + O C O + 2 H O 4 2 2 2
  • E 3 C H + 5 O C O + 2 C O + 6 H O 4 2 2 2

Q25:

Which of the following is not a balanced chemical equation?

  • A 3 H C l O H C l O + H O + 2 C l O 3 4 2 2
  • B 3 H C l O H C l O + H O + C l + 2 O 3 4 2 2 2
  • C 8 H C l O 4 H C l O + 2 H O + 2 C l O + C l + O 3 4 2 2 2 2
  • D 2 H C l O H O + C l + 2 O 3 2 2 2
  • E 5 H C l O 3 H C l O + H O + C l + O 3 4 2 2 2

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