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...Write your name here surname other names edexcel certificate centre number candidate international gcse chemistry unit kch ch paper c tuesday may morning reference time hour you must have total marks ruler calculator instructions t use black ink or ball point pen fill in the boxes at top of this page with and answer all questions spaces provided there be more space than need show steps any calculations state units information mark for is each question are shown brackets as a guide to how much spend on advice read carefully before start it keep an eye answers neatly good english try every check if end turn over pa pearson education ltd blank many chemical reactions occur atmosphere pie chart shows relative amounts some gases air i label gas that makes up most ii what approximate percentage oxygen place cross one box iii words from complete sentences about word used once not diatomic dense neon nitrogen unreactive water argon called noble because very vapour varies weather...