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?

  • A2CO+3HO22
  • B2CO+2HO22
  • CCO+2HO22
  • DCO+3HO22

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?

  • AHO,CO22
  • BCO,HO2
  • CCO,O22
  • DHO,CO2
  • ECO,HO22

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?

  • ACH+OCO+HO422232
  • BCH+OCO+2HO422
  • CCH+OC+2HO42212
  • DCH+2OCO+2HO4222
  • ECH+OCHOH42312

Q8:

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

  • ACHCHOH+2O2CO+3HO32222
  • BCHCHOH+O2CO+3HO3222272
  • CCHCHOH+O2C+3HO322232
  • DCHCHOH+2O2CO+3HO3222
  • ECHCHOH+3O2CO+3HO32222

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?

  • A4, 4
  • B3, 2
  • C3, 3
  • D2, 3
  • E3, 4

Q10:

Which of the following equations illustrates a complete combustion reaction?

  • AEthaneoxygenethanol+
  • BMethaneoxygencarbonmonoxidewater++
  • CCarbondioxidewaterGlucoseoxygen++
  • DGlucoseoxygencarbonmonoxidewater++
  • EEthaneoxygencarbondioxidewater++

Q11:

Which of the following is the correct balanced symbol equation for the complete combustion of heptane?

  • ACH+8O7CO+8HO+716222energy
  • BCH+11O7CO+8HO+energy716222
  • CCH+11O7CO+8HO+716222energy
  • DCH+11O8CO+7HO+716222energy
  • ECH+OCO+HO+716222energy

Q12:

Which of the following statements is true?

  • AComplete combustion produces carbon monoxide and water as the major products.
  • BComplete combustion needs a high amount of energy to occur.
  • CComplete combustion produces a low amount of energy.
  • DComplete combustion is the complete oxidation of fuel.
  • EComplete combustion is the partial oxidation of fuel.

Q13:

Fill in the blank: Complete combustion reactions release energy to the surroundings and so are said to be .

  • Asingle-replacement reactions
  • Bprecipitation reactions
  • Cendothermic reactions
  • Dneutralization reactions
  • Eexothermic reactions

Q14:

Fill in the blank: Complete combustion reactions are easy to recognize because the products are always .

  • Acarbon dioxide and water
  • Bcarbonic acid and water
  • Ccarbon and water
  • Doxygen and water
  • Ecarbon monoxide and water

Q15:

Fill in the blank: Complete combustion of hydrocarbons occurs if enough is present.

  • Acarbon monoxide
  • Bhydrogen
  • Coxygen
  • Dhydrogen peroxide
  • Ecarbon dioxide

Q16:

Which of the following statements is false?

  • AComplete combustion produces carbon dioxide and water as the major products.
  • BComplete combustion is the complete oxidation of fuel.
  • CComplete combustion produces a high amount of energy.
  • DComplete combustion occurs when a sufficient amount of O2 is available.
  • EComplete combustion occurs when an insufficient amount of O2 is available.

Q17:

What is the complete word equation for the complete combustion of CH4?

  • AMethanecarbondioxideoxygenwater++
  • BMethaneoxygencarbondioxidewater++
  • CMethaneoxygensaltwater++
  • DMethaneoxygencarbonmonoxidewater++
  • EMethaneoxygencarboxylicacidwater++

Q18:

Which of the following statements does not describe a complete combustion reaction?

  • AComplete combustion reactions release more energy than they consume.
  • BComplete combustion requires a sufficient amount of oxygen to occur.
  • CThe products of complete combustion reactions are carbon dioxide and water.
  • DComplete combustion reactions consume more energy than they release.
  • EComplete combustion reactions are a type of exothermic reaction.

Q19:

An experiment was carried out to determine the products of the combustion of a hydrocarbon, as shown in the diagram below. If the hydrocarbon was burned with a sufficient amount of oxygen, what will happen to the limewater?

  • ANo change will occur.
  • BThe limewater will turn milky due to the presence of CO2 gas.
  • CA white precipitate will be formed.
  • DThe limewater will turn yellow due to the presence of CO2 gas.
  • EThe limewater will turn milky due to the presence of CO gas.

Q20:

The diagram below shows an experiment to determine the products of the combustion of a hydrocarbon. After some time, the limewater turns milky due to the presence of CO2 gas. What type of reaction does this experiment represent?

  • ANeutralization reaction
  • BDisplacement reaction
  • CDecomposition reaction
  • DComplete combustion reaction
  • EPrecipitation reaction

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