Carbon compounds as fuels and feedstock Organic chemistry Revision…

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37 objective pages available

Crude oil, hydrocarbons and alkanes10 objectives

Describe crude oil as a finite resource found in rocks.
Explain that crude oil is the remains of an ancient biomass consisting mainly of plankton buried in mud.
Describe crude oil as a mixture of a very large number of compounds.
State that most of the compounds in crude oil are hydrocarbons.
State that most hydrocarbons in crude oil are alkanes.
State the general formula for the homologous series of alkanes as CnH2n+2.
Recall the first four members of the alkanes as methane, ethane, propane and butane.
Represent alkane molecules in displayed, structural and molecular formula forms.
Recognise substances as alkanes from their formulae.
Use molecular modelling kits to make models of alkane molecules. (WS 1.2)

Fractional distillation and petrochemicals7 objectives

Explain that crude oil hydrocarbons may be separated into fractions by fractional distillation.
Explain that each fraction contains molecules with a similar number of carbon atoms.
Explain that fractions can be processed to produce fuels and feedstock for the petrochemical industry.
Identify common fuels produced from crude oil, such as petrol, diesel oil, kerosene, heavy fuel oil and liquefied petroleum gases.
Identify useful materials produced by the petrochemical industry, such as solvents, lubricants, polymers and detergents.
Explain that the diversity of carbon compounds comes from carbon atoms forming families of similar compounds.
Explain how fractional distillation works in terms of evaporation and condensation.

Properties and combustion of hydrocarbons9 objectives

State that some properties of hydrocarbons depend on the size of their molecules, including boiling point, viscosity and flammability.
Recall how boiling point changes with increasing molecular size.
Recall how viscosity changes with increasing molecular size.
Recall how flammability changes with increasing molecular size.
Explain that combustion of hydrocarbon fuels releases energy.
Explain that carbon and hydrogen in hydrocarbon fuels are oxidised during combustion.
State that complete combustion of a hydrocarbon produces carbon dioxide and water.
Write balanced equations for the complete combustion of hydrocarbons with a given formula.
Investigate the properties of different hydrocarbons. (WS 1.2, 4.1)

Cracking and alkenes11 objectives

Explain that hydrocarbons can be cracked to produce smaller, more useful molecules.
Describe catalytic cracking and steam cracking as methods of cracking.
Describe in general terms the conditions used for catalytic cracking and steam cracking.
State that the products of cracking include alkanes and alkenes.
Explain that alkenes are more reactive than alkanes.
Explain that bromine water is used as a test for alkenes.
Recall the colour change when bromine water reacts with an alkene.
Explain that some cracked products are useful as fuels because there is a high demand for fuels with small molecules.
Explain that alkenes are used to produce polymers and as starting materials for the production of many other chemicals.
Balance chemical equations as examples of cracking when given the formulae of the reactants and products.
Give examples to illustrate the usefulness of cracking and explain how modern life depends on the uses of hydrocarbons.

finite resourcecrude oilCrude oilBiomassHydrocarbonCrude OilalkanesAlkaneHomologous seriesMethaneMolecular FormulaMolecular modelling kits

Understand Crude Oil's Nature: Remember to remember that crude oil is a finite resource found in rocks, and emphasize its limited availability in your answers. Link the answer to Crude oil, hydrocarbons and alkanes, keep the formula or organic family precise, and avoid mixing alkanes, alkenes, cracking, combustion, monomers, and polymers.
Link ancient biomass to modern fuels: When answering, start by naming the ancient biomass (plankton) and explain that it was buried in mud, then highlight how this organic matter was transformed into crude oil through heat and pressure over millions of years.

Finite resource misconception: Explain that crude oil is a finite resource formed over millions of years from ancient biomass and cannot be replenished on a human timescale.
Misunderstanding Crude Oil Formation: Emphasize that crude oil specifically originates from the remains of ancient biomass, primarily plankton, which were buried in mud over millions of years.

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