Starter quiz
- When wood burns it reacts with which gas?
- carbon dioxide
- water vapour
- oxygen ✓
- nitrogen
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- When a fuel containing carbon is burnt which gas will be produced?
- nitrogen
- oxygen
- argon
- carbon dioxide ✓
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- What is a chemical test for carbon dioxide?
- bubble through limewater and it will turn cloudy ✓
- place a glowing splint in the gas and it will relight
- white anhydrous copper sulfate crystals will turn blue
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- What is the scientific name for burning?
- respiration
- photosynthesis
- combustion ✓
- precipitation
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- Which of the following are examples of fossil fuels?
- crude oil ✓
- nuclear fuel
- natural gas ✓
- coal ✓
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- Match the scientific key terms with the correct definition
- hydrocarbons⇔molecules made of hydrogen and carbon atoms only ✓
- conservation of mass⇔the total mass of reactants equals the total mass of products formed ✓
- exothermic reactions⇔chemical reactions in which thermal energy is given out ✓
- fossil fuels⇔fuels made over millions of years from dead plants and animals ✓
Exit quiz
- What word is used to describe the chemical combination of a substance with oxygen involving the production of heat and light?
- 'combustion' ✓
- What are possible products for the complete combustion of methane (a hydrocarbon)?
- carbon dioxide + water ✓
- carbon monoxide + water
- carbon + water
- methane + oxygen
- carbon dioxide + hydrogen
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- What are possible products for the incomplete combustion of butane (a hydrocarbon)?
- carbon dioxide + water
- carbon monoxide + water ✓
- carbon + water ✓
- butane + oxygen
- carbon dioxide + hydrogen
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- The chemical test for which gas is to relight a glowing splint?
- 'oxygen' ✓
- True or false? Complete combustion releases larger amounts of energy than incomplete combustion of the same fuel.
- True ✓
- False
- Which of the following shows a correctly balanced equation for the complete combustion of propene (C₃H₆)?
- 2C₃H₆ + 9O₂ → CO₂ + 6H₂O
- 2C₃H₆ + O₂ → 6CO₂ + 6H₂O
- 2C3H6 + 9O₂ → 6CO2 + 6H2O
- 2C₃H₆ + 9O₂ → 6CO₂ + 6H₂O ✓
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Worksheet
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Lesson Details
Key learning points
- Combustion is the chemical combination of a substance with oxygen, involving the production of heat and light.
- Complete combustion of fuels (like hydrocarbons) involve the production of carbon dioxide and water.
- The chemical test for oxygen is a combustion reaction, involving relighting a glowing splint.
- Incomplete combustion produces carbon particulates (soot) and carbon monoxide due to reduced oxygen levels.
Common misconception
All combustion is complete, producing only CO₂ and water.
Highlight the differences between complete and incomplete combustion.
Keywords
Combustion - Combustion is an exothermic reaction where a substance reacts with oxygen.
Complete combustion - The complete combustion of fuels, such as hydrocarbons, occurs when enough oxygen is present to convert all the fuel into carbon dioxide and water.
Hydrocarbons - Hydrocarbons are compounds containing only hydrogen and carbon atoms.
Incomplete combustion - Incomplete combustion is when a substance reacts only partially with oxygen, such as when carbon burns in air, producing carbon dioxide, carbon monoxide and soot (unburnt carbon).
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