Lesson Worksheet: Incomplete Combustion of Hydrocarbons Chemistry

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

Question 1

Which of the following combustion reactions is incomplete?

  • AC+OCO22
  • BCH+OC+2HO422
  • CCH+3O2CO+2HO24222
  • D2CH+5O4CO+2HO22222
  • E2CH+7O4CO+6HO26222

Question 2

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

  • AFuel
  • BLight
  • CHeat
  • DWater
  • EOxygen

Question 3

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

Question 4

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

  • AC
  • BCO2
  • CHO2
  • DCO
  • EHO22

Question 5

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.

Question 6

Choose the three numbers that, 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

Question 7

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

  • ACH+3O6CO+6H61222
  • BCH+6O6CO+6H6122
  • CCH+12O6CO+6HO6122
  • DCH+9O6CO+6HO612222
  • ECH+6O6CO+6HO61222

Question 8

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

Question 9

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.

Question 10

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

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

This lesson includes 9 additional questions for subscribers.

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