Worksheet: Incomplete Combustion of Hydrocarbons

In this worksheet, we will practice describing the incomplete combustion of hydrocarbons by writing, balancing, and interpreting chemical equations.

Q1:

Which of the following combustion reactions is incomplete?

  • A C + O C O 2 2
  • B C H + O C + 2 H O 4 2 2
  • C C H + 3 O 2 C O + 2 H O 2 4 2 2 2
  • D 2 C H + 5 O 4 C O + 2 H O 2 2 2 2 2
  • E 2 C H + 7 O 4 C O + 6 H O 2 6 2 2 2

Q2:

For a fuel to undergo incomplete combustion, which of the following must be present in insufficient quantities?

  • AFuel
  • BLight
  • CHeat
  • DWater
  • EOxygen

Q3:

Which toxic, colorless and odorless gas may be produced by the incomplete combustion of a hydrocarbon?

  • ASulfur dioxide
  • BHydrogen peroxide
  • CCarbon dioxide
  • DCarbon monoxide
  • ESteam

Q4:

Which of the following compounds is least likely to be produced during the incomplete combustion of a hydrocarbon?

  • A C
  • B C O 2
  • C H O 2
  • D C O
  • E H O 2 2

Q5:

Why is carbon monoxide a poisonous gas?

  • AIt irritates mucous membranes in the eyes.
  • BIt causes suffocation.
  • CIt irritates the respiratory tract.
  • DIt inhibits the ability of the blood to carry oxygen.
  • EIt causes blindness.

Q6:

Which three numbers in the correct order balance the following incomplete combustion reaction? CH+OCO+CO+HO38222𝑥𝑦𝑧

  • A2, 1, 2
  • B4, 4, 2
  • C2, 2, 4
  • D4, 2, 4
  • E2, 2, 2

Q7:

Hexane was burnt in a crucible and incomplete combustion occurred. Which equation represents incomplete combustion?

  • A C H + 3 O 6 C O + 6 H 6 1 2 2 2
  • B C H + 6 O 6 C O + 6 H 6 1 2 2
  • C C H + 1 2 O 6 C O + 6 H O 6 1 2 2
  • D C H + 9 O 6 C O + 6 H O 6 1 2 2 2 2
  • E C H + 6 O 6 C O + 6 H O 6 1 2 2 2

Q8:

Which of the following word equations represents the incomplete combustion of methane?

  • AMethane + oxygen → carbon monoxide + hydrogen
  • BMethane + oxygen → carbon monoxide + water
  • CMethane + oxygen → carbon dioxide + hydrogen
  • DMethane + oxygen → carbon dioxide + water
  • EMethane + water → carbon dioxide + hydrogen

Q9:

Which of the following can only be produced from an incomplete combustion reaction?

  • ASmaller hydrocarbons
  • BMethane
  • CHydrogen
  • DCarbon
  • ECarbon dioxide

Q10:

Which of the following observations is a difference between a complete and an incomplete combustion reaction?

  • AA dirty flame is observed.
  • BMore energy is produced.
  • CSoot is formed.
  • DA toxic gas is formed.
  • EBlack smoke is formed.

Q11:

Which poisonous gas, produced by incomplete combustion, is monitored by gas detectors fitted in some homes?

  • AMethane
  • BOxygen
  • CWater vapor
  • DCarbon dioxide
  • ECarbon monoxide

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