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

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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 The ... diagram shows the sub‑atomic particles in an atom of an element. + + + + – + – – –– P Q R S (a) (i) Give the name of each of the sub‑atomic particles labelled P, Q and R. (3) P ............................................................................................................................................................................................................................................................................... Q .............................................................................................................................................................................................................................................................................. R ............................................................................................................................................................................................................................................................................... (ii) Give the name of the part of the atom labelled S. (1) .................................................................................................................................................................................................................................................................................... (b) Give the name of this element. (1) .................................................................................................................................................................................................................................................................................... (Total for Question 1 = 5 marks)4 *P70948A0420*  2 A potassium permanganate crystal is placed in a beaker of water. potassium permanganate crystal After several days a coloured solution forms. (a) Give the names of the two processes that cause the coloured solution to form. (2) 1 ............................................................................................................................................................................................................................................................................... 2 ............................................................................................................................................................................................................................................................................... (b) The formula of potassium permanganate is KMnO4 (i) How many different types of atom are in KMnO4? (1) A 3 B 4 C 6 D 7 (ii) Calculate the relative formula mass (Mr) of KMnO4 (1) M r = .............................................................. (c) Potassium permanganate can be used as an oxidising agent. State what is meant by the term oxidising agent. (1 [Show More]

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