5.7.1.3 Some properties of Recall how boiling point, 1 Explain the properties of Investigate the properties of Video clips: hydrocarbons depend on the viscosity and hydrocarbons in relation to different hydrocarbons in size of their molecules, flammability change with intermolecular forces. terms of boiling point, including boiling point, increasing molecular viscosity and flammability viscosity and flammability. size. Write balanced symbol with increasing molecular These properties influence equations for the size. how hydrocarbons are used Write balanced combustion of hydrocarbon as fuels. equations for the fuels. Identify the products of complete combustion of combustion of alkanes. The combustion of hydrocarbons with a Describe the balanced hydrocarbon fuels releases given formula. symbol equation including energy. During combustion, moles present, reactants the carbon and hydrogen in Knowledge of trends in and products. the fuels are oxidised. The properties of complete combustion of a hydrocarbons is limited hydrocarbon produces to: carbon dioxide and water. boiling points viscosity flammability. WS 1.2, 4.1 5.7.1.4 Hydrocarbons can be broken Describe in general 1 Describe the process of Demo or practical: crack Video clips down (cracked) to produce terms the conditions cracking. paraffin over porous clay YouTube: smaller, more useful used for catalytic pot. molecules. cracking and steam Explain the process of cracking. cracking. Use bromine water to Cracking can be done by identify alkenes. various methods including Recall the colour Write balanced symbol catalytic cracking and steam change when bromine equations for the cracking Test for unsaturation in cracking. water reacts with an of alkanes. other compounds. alkene.
5.7.1.3 Some properties of hydrocarbons depend on the size of their molecules, including boiling point, viscosity and flammability. These properties influence how hydrocarbons are used as fuels. The combustion of hydrocarbon fuels releases energy. During combustion, the carbon and hydrogen in the fuels are oxidised. The complete combustion of a hydrocarbon produces carbon dioxide and water. Recall how boiling point, viscosity and flammability change with increasing molecular size. Write balanced equations for the complete combustion of hydrocarbons with a given formula. Knowledge of trends in properties of hydrocarbons is limited to: boiling points viscosity flammability. WS 1.2, 4.1 1 Explain the properties of hydrocarbons in relation to intermolecular forces. Write balanced symbol equations for the combustion of hydrocarbon fuels. Describe the balanced symbol equation including moles present, reactants and products. Investigate the properties of different hydrocarbons in terms of boiling point, viscosity and flammability with increasing molecular size. Identify the products of combustion of alkanes. Video clips: 5.7.1.4 Hydrocarbons can be broken down (cracked) to produce smaller, more useful molecules. Cracking can be done by various methods including catalytic cracking and steam cracking. Describe in general terms the conditions used for catalytic cracking and steam cracking. Recall the colour change when bromine water reacts with an alkene. 1 Describe the process of cracking. Explain the process of cracking. Write balanced symbol equations for the cracking of alkanes. Demo or practical: crack paraffin over porous clay pot. Use bromine water to identify alkenes. Test for unsaturation in other compounds. Video clips YouTube:
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