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Chemistry is the study of the composition, behaviour and properties of matter, and of the elements of the earth and its atmosphere. Unit 2 resources (2009 - 2017 specification) unit 2 revision pack topic 1 - basic organic concepts and hydrocarbons this topic covers 21 basic concepts and hydrocarbons (except percentage yield and atom economy) basic concepts in organic chemistry hw (mark scheme) alkanes hw (mark scheme) alkenes hw (mark scheme. These revision notes and practice questions on how to do percentage yield chemical calculations and worked examples should prove useful for the new aqa, edexcel and ocr gcse (9–1) chemistry science courses. Ocr a chemistry - complete resources for as/1st year of a-level 5 41 customer reviews author: created by resources and a scheme of work for the entire 1st year of the ocr a chemistry a-level course (or the whole as course) however, can be adapted for other a-level chemistry specifications 59-percentage-yield-and-makinga.
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