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...Cambridge igcse chemistry paper theory extended february march hour minutes you must answer on the question no additional materials are needed instructions all questions use a black or dark blue pen may an hb pencil for any diagrams graphs write your name centre number and candidate in boxes at top of page to each space provided do not erasable correction fluid bar codes calculator should show working appropriate units information total mark this is marks part shown brackets periodic table printed document has pages blank indicated ib rp ucles b fraction leaving c refinery gas mixture hydrocarbons one butane h i suggest names two other gases ii w rite chemical equation complete combustion iii toxic produced by incomplete f m d gasoline kerosene both fuels they have different properties describe differences given viscosity fuel flammability what difference molecules causes these e hydrogen cells can be used power vehicles word overall reaction that takes place cell meant term electrolys...