OCR Study guides, Class notes & Summaries

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OCR A Level Chemistry A (H432) Chemistry B (H433) PAG 5: Synthesis of an organic liquid Practice Exam Questions and Mark Scheme 1. Ethanol is oxidised to ethanoic acid using acidified potassium dichromate(IV) solution. The reaction is heated under reflux using the equipment shown in the diagram below. What is the reason for heating under reflux? A. to ensure even heating B. to prevent any substances escaping C. to boil the mixture at a higher temperature D. to allow efficient mixing Yo...

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OCR 2023 Classical Civilisation H408/34: Democracy and the Athenians A Level Question Paper & Mark Scheme (Merged)

Define what is meant by abstraction. Abstraction means removing unnecessary details to focus on the important elements. What is an algorithm? An algorithm is a step-by-step procedure for solving problems. Brainpower Read More Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:01 / 0:15 Full screen An algorithm can be written and displayed as plain, written text. State two other ways of displaying algorithms. Pseudocode Flow diagrams Defi...

This is the final mark scheme

This is the final mark scheme

This is the final mark scheme