5.7.1.3 Some properties of Recall how boiling point, 1 Students can investigate Video clips: Describe trends in hydrocarbons depend on viscosity and flammability the flammability of heavy properties of boiling point, the size of their change with increasing paraffin oil (alkane), viscosity and flammability molecules, including molecular size. butane and pentane on a of hydrocarbons with boiling point, viscosity deflagrating spoon and increasing molecular size. and flammability. These Write balanced equations observing the colour of properties influence how for the complete the flame. Describe the products of hydrocarbons are used combustion of as fuels. hydrocarbons with a combustion of alkanes Compare this with given formula. products of a Bunsen using a balanced equation. The combustion of flame (methane) with hydrocarbon fuels Knowledge of trends in both the air hole open releases energy. During properties of and closed (combustion combustion, the carbon hydrocarbons is limited apparatus with limewater and hydrogen in the fuels to: and condensing tube). are oxidised. The boiling points complete combustion of a viscosity hydrocarbon produces flammability. carbon dioxide and water. WS 1.2, 4.1 5.7.1.4 Hydrocarbons can be Describe in general terms 2 Describe the process of Demonstrate cracking Video clips broken down (cracked) to the conditions used for cracking. liquid paraffin over YouTube: produce smaller, more catalytic cracking and aluminium oxide: useful molecules. steam cracking. Write balanced symbol equations for the cracking Cracking can be done by Recall the colour change of alkanes given the Or class can do this various methods when bromine reacts formulae of the reactants practical on a including catalytic with an alkene. and products. microscale: cracking and steam cracking. Balance chemical Describe examples to equations as examples of illustrate the usefulness of Use bromine water to The products of cracking cracking given the cracking. identify alkenes and include alkanes and
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 Describe trends in properties of boiling point, viscosity and flammability of hydrocarbons with increasing molecular size. Describe the products of combustion of alkanes using a balanced equation. Students can investigate the flammability of heavy paraffin oil (alkane), butane and pentane on a deflagrating spoon and observing the colour of the flame. Compare this with products of a Bunsen flame (methane) with both the air hole open and closed (combustion apparatus with limewater and condensing tube). 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. The products of cracking include alkanes and Describe in general terms the conditions used for catalytic cracking and steam cracking. Recall the colour change when bromine reacts with an alkene. Balance chemical equations as examples of cracking given the 2 Describe the process of cracking. Write balanced symbol equations for the cracking of alkanes given the formulae of the reactants and products. Describe examples to illustrate the usefulness of cracking. Demonstrate cracking liquid paraffin over aluminium oxide: Or class can do this practical on a microscale: Use bromine water to identify alkenes and Video clips YouTube:
AQA-8464F-SOW-ORGANIC.DOCX