information in answer is relevant, clear, organised and presented in a structured and coherent format. Specialist terms are used appropriately. Few, if any, errors in grammar, punctuation and spelling. (5-6 marks) Level 2 Answer identifies at least one correct condition and applies limited knowledge of cracking to explain why at least one fraction from the table could be cracked. For the most part the information is relevant and presented in a structured and coherent format. Specialist terms are used for the most part appropriately. There are occasional errors in grammar, punctuation and spelling. (3-4 marks) 1 Answer includes one condition and some idea about using cracking to make more useful products. Answer may be simplistic. There may be limited use of specialist terms. Errors of grammar, punctuation and spelling prevent communication of the science. (1-2 marks) 0 Insufficient or irrelevant science. Answer not worthy of credit. (0 marks) cracking converts large hydrocarbon molecules into smaller ones cracking converts less useful hydrocarbons into more useful hydrocarbons cracking converts named fractions that are in excess into named fractions that are in short supply e.g. bitumen or paraffin into petrol or diesel the table shows that petrol and diesel are in short supply the table shows that bitumen and paraffin are in excess and that these are large molecules B1C1P1 Specimen – H Cracking is an important reaction that takes place within an oil refinery. Cracking converts large hydrocarbon molecules into more useful smaller hydrocarbon molecules.
symbol equations, the importance of some of the products formed. For the most part the information is relevant and presented in a structured and coherent format. Specialist terms are used for the most part appropriately. There are occasional errors in grammar, punctuation and spelling. (3-4 marks) Level 1 Answer attempts an explanation to include at least one reason for cracking and an idea of possible products. Answer may be simplistic. There may be limited use of specialist terms. Errors of grammar, punctuation and spelling prevent communication of the science. (1-2 0 Insufficient or irrelevant science. Answer not worthy of credit. (0 marks) Equations can use molecular, structural or displayed formulae Get many products because any of the carbon-carbon bonds in hexadecane can break B1C1P1 Jan 2012 - F Mark Scheme:
Mark Scheme: Jun 2012 C1C2C3 – Higher Mark Scheme: B2C2P2 Specimen F Mark Scheme: Level 3 Detailed description of Earth structure, including all the main parts of the Earth, and the effects of plate movement. All information in answer is relevant, clear, organised and presented in a structured and coherent format. Specialist terms are used appropriately. Few, if any, errors in grammar, punctuation and spelling. (5-6 marks) Level 2 Limited description of structure with some reference to the effects of plate movement. For the most part the information is relevant and presented in a structured and coherent format. Specialist terms are used for the most part appropriately. There are occasional errors in grammar, punctuation and spelling. (3-4 marks) Level 1 Identifies some parts of the Earth and recognises that tectonic plates move. Answer may be simplistic. There may be limited use of specialist terms. Errors of grammar, punctuation and spelling prevent communication of the science. 6 Relevant points include: Earth is a sphere Earth is made up of core, thin, rocky crust and mantle core contains iron beneath the surface there is molten rock called magma tectonic plates move (very slowly or about 2.5cm per year) tectonic plate movement causes volcanoes tectonic plate movement causes earthquakes idea of over millions of years movement results in the formation of continents allow tectonic plate movement causes mountain ranges to be formed allow higher level answers involving convection currents in the mantle, that crust is less dense than the mantle or a description of the lithosphere