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Chemistry Unit: 4CH0 Paper: 2CR Write your name here Surname Other names Centre Number Candidate Number Pearson Edexcel International GCSE Chemistry Unit: 4CH0 Paper: 2CR Wednesday 13 June 2018 – Morning Paper Reference Time: 1 hour 4CH0/2CR You must have: Total Marks Ruler, calculator Instructions • Use black ink or ball-point pen. • Fill in the boxes at the top of this page with your name, centre number and candidate number. • Answer all questions. • Answer the questions in the spaces provided – there may be more space than you need. • Show all the steps in any calculations and state the units. • 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 . Information • The total mark for this paper is 60. • The marks for each question are shown in brackets – use this as a guide as to how much time to spend on each question. Advice • Read each question carefully before you start to answer it. • Write your answers neatly and in good English. • Try to answer every question. • Check your answers if you have time at the end. Turn over P53147A ©2018 Pearson Education Ltd. *P53147A0120* 1/1/1/1/1/1/ DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA *P53147A0220* 2 Answer ALL questions. 1 The table shows some information about five gases. Formula Boiling point Gas of molecule in °C chlorine Cl2 –35 oxygen O2 –183 carbon monoxide CO –191 nitrogen N2 –196 DO NOT WRITE IN THIS AREA WRITE IN DO NOT hydrogen H2 –253 Choose gases from the table to answer this question. You may use each gas once, more than once, or not at all. (a) Name the gas that is a compound. (1) .................................................................................................................................................................................................................................................................................... (b) Name the gas necessary for rusting to occur. (1) .................................................................................................................................................................................................................................................................................... (c) Name the gas that bleaches moist litmus paper. (1) DO NOT WRITE IN THIS AREA WRITE IN DO NOT .................................................................................................................................................................................................................................................................................... (d) Name the gas that has the highest percentage by volume in air. (1) .................................................................................................................................................................................................................................................................................... (e) Name the gas that has the highest boiling point. (1) .................................................................................................................................................................................................................................................................................... (f) Determine the two gases that have the same relative formula mass. (1) 1 ............................................................................................................................................................................................................................................................................... 2 ............................................................................................................................................................................................................................................................................... (Total for Question 1 = 6 marks) THIS AREA WRITE IN DO NOT 3 *P53147A0320* Turn over THIS AREA WRITE IN DO NOT 2 A student uses this apparatus to study the rate of the reaction between marble chips and dilute hydrochloric acid. cotton wool marble chips dilute hydrochloric acid balance She uses this method. THIS AREA WRITE IN DO NOT Ɣ place a conical flask on a balance Ɣ put 15 g of large marble chips in the flask Ɣ add 25 cm3 of dilute hydrochloric acid to the flask Ɣ record the mass of the flask and contents, and start a timer Ɣ record the mass of the flask and contents every 30 seconds until the reaction ends The equation for the reaction is → CaCO3(s) + 2HCl(aq) CaCl2(aq) + CO2(g) + H2O(l) (a) (i) Explain what happens to the mass of the flask and contents during the reaction. (2) .................................................................................................................................................................................................................................................................................... DO NOT WRITE IN THIS AREA WRITE IN DO NOT .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (ii) State why the reaction ends, even though some marble chips remain in the flask. (1) ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... 4 *P53147A0420* (iii) State how the student would know when the reaction has ended. (1) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (b) The student plots her results on a grid. 0.7 – 0.6 – DO NOT WRITE IN THIS AREA WRITE IN DO NOT 0.5 – loss in 0.4 – mass in g 0.3 – 0.2 – 0.1 – 0 – – – – – – – – – 0 2 4 6 8 10 12 14 time in minutes (i) At which time is the rate of reaction greatest? (1) DO NOT WRITE IN THIS AREA WRITE IN DO NOT A 1 minute B 4 minutes C 6 minutes D 8 minutes (ii) The student repeats the experiment with the same volume and concentration of acid, but with 15 g of smaller marble chips. On the grid, sketch the curve you would expect for this experiment. (2) THIS AREA WRITE IN DO NOT 5 *P53147A0520* Turn over THIS AREA WRITE IN DO NOT (c) Explain how decreasing the concentration of the hydrochloric acid affects the rate of reaction. Refer to particle collision theory in your answer. (3) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... ...................................................................................................................................................................................................................................................................................
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