Presentation on theme: "COMBUSTION Describe the process of combustion"— Presentation transcript:
1 COMBUSTION Describe the process of combustion Write word and symbol equations for combustion reactions.
2 Starter Suggest one use for each fuel: Natural gas Petrol Diesel KeroseneHeating oil
3 To describe the process of combustion. If you light a candle and put jar over it, what do you predict will happen? Can you explain this?Fuel ( e.g hydrocarbon) and oxygen. Oxidation reactionSo, what are needed?What type of reaction is this?Why do we burn things?
4 To describe the process of combustion. Crude oil can be separated by fractional distillation. The oil is evaporated and the hydrocarbon chains of different lengths condense at different temperatures:Fractions with low boiling points condense at the topFractions with high boiling points condense at the bottom
5 What happens when fossil fuels burn? The apparatus below is used to test what is made when the hydrocarbon wax burns…Suctionpumpice-waterCandle wax is thehydrocarbon hereLime waterLiquid collectedcan be tested withanhydrous cobalt chloridepaper (bluepink).any hydrocarbon + oxygen water + carbon dioxide
6 To describe the process of combustion. Complete combustion- With enough oxygenIncomplete combustion- without enough oxygen
9 To write word and symbol equations for combustion reactions. Methane + Oxygen Carbon Dioxide + WaterCH4 + 2O2 -> CO2 + 2H2OMethane + Oxygen -> Carbon Monoxide + Water2CH4 + 3O2 -> 2CO + 4H2ONow work through the questions on page 223 of your SciPad
10 To know possible fuels that can be used in the home.
11 In the back of your books, see how many questions you can answer without looking at your notes Success criteria-Describe the process of combustionWrite word and symbol equations for combustion reactions.State 3 fuels we use daily.What happens when fuels burn?What is complete combustion?Word equation-Symbol equation-What is incomplete combustion?What is a problem with burning fossil fuels?