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?

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

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?

  • AC
  • BCO2
  • CHO2
  • DCO
  • EHO22

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?

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

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

Q12:

Which of the following statements is true?

  • AIncomplete combustion produces a high amount of energy.
  • BIncomplete combustion occurs when a high amount of O2 is available.
  • CIncomplete combustion is the complete oxidation of fuel.
  • DIncomplete combustion produces carbon dioxide and water as the only products.
  • EIncomplete combustion is the partial oxidation of fuel.

Q13:

What are the main products formed during incomplete combustion?

  • ACO+HO+C22 (soot)
  • BHO+CO2
  • CCO+C (soot)
  • DCO+HO22
  • ECO+HO+C2 (soot)

Q14:

What is the environmental impact of incomplete combustion reactions?

  • AGlobal warming from carbon and smoke
  • BAir pollution from carbon dioxide and water
  • CAir pollution from carbon dioxide and smoke
  • DAir pollution from carbon monoxide and smoke
  • EGlobal warming from carbon dioxide

Q15:

Which of the following statements is false?

  • AIncomplete combustion produces CO+HO+C2 (soot) as byproducts.
  • BIncomplete combustion produces a poisonous gas.
  • CIncomplete combustion is the complete oxidation of fuel.
  • DIncomplete combustion is the partial oxidation of fuel.
  • EIncomplete combustion occurs when there is not enough amount of O2 available.

Q16:

Fill in the blank: Incomplete combustion of hydrocarbons occurs if not enough is present.

  • Ahydrogen
  • Bcarbon monoxide
  • Chydrogen peroxide
  • Dcarbon dioxide
  • Eoxygen

Q17:

During incomplete combustion of a hydrocarbon the carbon atoms react with oxygen to produce instead of .

  • Acarbon monoxide, carbon dioxide
  • Bcarbon monoxide, water
  • Ccarboxylic acid, carbon monoxide
  • Dcarbon dioxide, carbon monoxide
  • Ecarbon dioxide, water

Q18:

Fill in the blank: In incomplete combustion, a flame is usually produced, while in complete combustion, a flame is produced.

  • Ablue, orange
  • Bblack, blue
  • Corange, yellow
  • Dred, yellow
  • Eyellow, blue

Q19:

Methane is a simple hydrocarbon. Complete the following word equation to show what happens when methane is incompletely combusted. Methane++

  • Aoxygen, carboxylic acid, water
  • Boxygen, carbon, hydrogen
  • Coxygen, carbon monoxide, carbon dioxide
  • Doxygen, carbon monoxide, water
  • Eoxygen, carbon dioxide, water

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.