Worksheet: Complete Combustion

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

Q1:

Fill in the blank: The combustion of methane gas forms and water.

  • Acarbon suboxide
  • Bcarbon dioxide
  • Ccarbon monoxide
  • Doxalic acid

Q2:

Which of the following is the yield of the reaction of CH+2O42?

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

Q3:

What are the products of the complete combustion of a hydrocarbon?

  • ACarbon + hydrogen
  • BCarbon dioxide + water
  • CCarbon monoxide + water
  • DCarbon + water
  • ECarbon dioxide + hydrogen peroxide

Q4:

Gas barbecues often use propane gas as a fuel source. The equation for the complete combustion of propane is shown. CH+5O3+4382

Which two chemicals, in the correct order, are missing?

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

Q5:

What type of reaction forms carbon dioxide and water from ethane burning in oxygen?

  • ADistillation
  • BPrecipitation
  • CDisplacement
  • DCombustion
  • ENeutralization

Q6:

Combustion reactions give out a lot of energy. Which of the following statements describes this phenomenon?

  • AEnergy is required to break bonds in the reactants and spreads out to the surroundings.
  • BThe number of bonds broken in the reactants is less than the number of bonds formed in the products.
  • CThe energy released from bonds breaking in the reactants is greater than the energy absorbed by bonds forming in the products.
  • DThe energy released from bonds forming in the products is greater than the energy required to break bonds in the reactants.
  • EThe energy released from bonds forming in the products is less than the energy required to break bonds in the reactants.

Q7:

Which equation represents a balanced symbol equation for the complete combustion of methane?

  • A C H + O C O + H O 4 2 2 2 3 2
  • B C H + O C O + 2 H O 4 2 2
  • C C H + O C + 2 H O 4 2 2 1 2
  • D C H + 2 O C O + 2 H O 4 2 2 2
  • E C H + O C H O H 4 2 3 1 2

Q8:

Which equation represents a balanced symbol equation for the complete combustion of ethanol?

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

Q9:

The equation below shows the complete combustion of butene. CH+6OCO+HO48222𝑥𝑦 Which two numbers replace 𝑥 and 𝑦, respectively, to balance the equation?

  • A 4 , 4
  • B 3 , 2
  • C 3 , 3
  • D 2 , 3
  • E 3 , 4

Q10:

Which of the following equations illustrates a complete combustion reaction?

  • A E t h a n e o x y g e n e t h a n o l +
  • B M e t h a n e o x y g e n c a r b o n m o n o x i d e w a t e r + +
  • C C a r b o n d i o x i d e w a t e r G l u c o s e o x y g e n + +
  • D G l u c o s e o x y g e n c a r b o n m o n o x i d e w a t e r + +
  • E E t h a n e o x y g e n c a r b o n d i o x i d e w a t e r + +

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