2022 pearson june booklet + mark scheme Edexcel International GCSE (9–1) 4CH1/2C Chemistry UNIT: 4CH1 PAPER: 2C

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Answer ALL questions. Some questions must be answered with a cross in a box . If you change your mind about an answer, put a line through the box and then mark your new answer with a cross . 1 This... question is about gases in the atmosphere. The box gives the names of some gases. argon carbon dioxide hydrogen nitrogen oxygen water vapour (a) Choose gases from the box to answer these questions. (i) Identify the least reactive gas in the atmosphere. (1) .................................................................................................................................................................................................................................................................................... (ii) Identify the most abundant gas in the atmosphere. (1) .................................................................................................................................................................................................................................................................................... (iii) Identify the gas that is not normally found in the atmosphere. (1) .................................................................................................................................................................................................................................................................................... (b) State an environmental problem caused by increasing amounts of carbon dioxide in the atmosphere. (1) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (c) Describe a test for carbon dioxide. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (Total for Question 1 = 6 marks)4 *P70947A0420*  2 (a) The diagram shows two pieces of apparatus, X and Y. 50 40 30 20 10 25 cm3 cm3 X Y (i) Give the name of each piece of apparatus. (2) X ............................................................................................................................................................................................................................................................................... Y ................................................................................................................................................................................................................................................................................ (ii) In a titration, a student adds 25.0 cm3 of barium hydroxide solution to a conical flask. Give a reason why it is better to use Y rather than X. (1) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (b) The student uses methyl orange indicator in the titration. (i) State the colour of methyl orange in barium hydroxide solution. (1) .................................................................................................................................................................................................................................................................................... (ii) Give a reason why universal indicator is not suitable for use in a titration. (1) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................... [Show More]

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