Pearson Edexcel Level 1 /Level 2 GCSE (9-1 Time 1 hour 10 minutes Paper reference 1 SCO/2CH Combined Science PAPER 5 Higher Tier

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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 quest ... ions in the spaces provided – there may be more space than you need. • Calculators may be used. • Any diagrams may NOT be accurately drawn, unless otherwise indicated. • You must show all your working out with your answer clearly identified at the end of your solution. 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. • In questions marked with an asterisk (*), marks will be awarded for your ability to structure your answer logically, showing how the points that you make are related or follow on from each other where appropriate. • There is a periodic table on the back cover of the paper. Advice • Read each question carefully before you start to answer it. • Try to answer every question. • Check your answers if you have time at the end. You must have: Calculator, ruler Combined Science PAPER 5 Higher Tier Time 1 hour 10 minutes 1SC0/2CH Pearson Edexcel Level 1/Level 2 GCSE (9–1) *P69474A0220* 2  Answer ALL questions. Write your answers in the spaces provided. 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 A student used the apparatus in Figure 1 to investigate the rate of the reaction between a metal and dilute hydrochloric acid. Pieces of the metal were placed in dilute hydrochloric acid in the flask, and the total volume of gas produced was measured every minute. hydrogen dilute hydrochloric acid metal pieces 250cm3 measuring cylinder trough water Figure 1 (a) Figure 2 shows a graph of the student’s results. volume of hydrogen in cm3 time in minutes 0 2 4 6 8 10 70 60 50 40 30 20 10 0 Figure 2 *P69474A0320* Turn over 3  (i) Name a piece of apparatus that would be better to measure the volume of gas produced, instead of the 250cm3 measuring cylinder. Give a reason for your answer. (2) name of apparatus .................................................................................................................................................................................................................................................................................... reason .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (ii) Calculate the mean rate of production of hydrogen over the first 90 seconds, in cm3 per second. (3) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... rate = .............................................................. cm3 per second (iii) The student measured the volume of gas for 10 minutes. State why the measurements could have been stopped at 9 minutes. (1) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (b) The experiment was repeated, but with acid of a higher concentration. The rate of reaction was faster. (i) Explain why the rate of reaction increases when the concentration of acid is increased. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... *P69474A0420* 4  (ii) Another student suggests four other ways of increasing the rate of this reaction. Which one is correct? (1) A use the same acid but at a lower temperature B use a larger trough C use a smaller flask D use the same metal but in a powdered form (Total for Question 1 = 9 marks) *P69474A0520* Turn over 5  2 This question is about gases. (a) When sodium is added to water, hydrogen gas is produced. Which observation shows that a gas has been produced? (1) A a white precipitate forms B effervescence is seen C the sodium sinks in the water D the water changes to a pink colour (b) Some damp litmus paper is placed in a gas. The litmus paper is bleached. Which gas bleaches damp litmus paper? (1) A carbon dioxide B chlorine C hydrogen D oxygen (c) When calcium carbonate is heated it decomposes. CaCO3(s) → CaO(s) + CO2(g) When 5.000g of calcium carbonate is heated, the mass of solid remaining is 2.800g. Calculate the mass of carbon dioxide that has been released. Give your answer to three significant figures. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... mass of carbon dioxide = .............................................................. g *P69474A0620* 6  (d) A diagram of an atom of helium is shown in Figure 3. + + − − + − Key = electron = neutron = proton Figure 3 (i) Explain, using Figure 3, why helium is inert. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (ii) Helium is used to fill balloons. State one property of helium, apart from it being inert, that makes it suitable for filling balloons. (1) .................................................................................................................................................................................................................................................................................... *P69474A0720* Turn over 7  (e) Oxygen gas has the formula O2. Calculate the number of oxygen atoms in 3.50mol of oxygen gas. (Avogadro constant = 6.02×1023) (2) ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... number of oxygen atoms = .............................................................. (Total for Question 2 = 9 marks) *P69474A0820* 8  3 (a) Figure 4 shows some information about the composition of pollutant exhaust gases from the engines of two different vehicles. pollutant mass of pollutant given out in g per kilometre driven petrol engine diesel engine carbon dioxide 210 180 carbon monoxide 1.5 0.10 unburnt hydrocarbons 0.13 0.020 nitrogen oxides 0.36 2.0 particulates 0.0060 0.046 sulfur dioxide 0.0089 0.0037 Figure 4 (i) Give two ways in which the data in Figure 4 shows that the diesel engine is more damaging to the environment than the petrol engine. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (ii) Explain, using information from Figure 4, one way in which the diesel engine is less damaging to the environment than the petrol engine. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... *P69474A0920* Turn over 9  (b) (i) Which statement about the members of the alkane homologous series is correct? (1) A they show a trend in chemical properties B their boiling point decreases as the molecules get larger C the molecular formula of neighbouring compounds differs by CH3 D their viscosity increases as the molecules get larger (ii) Which one of the following hydrocarbons belongs to the same homologous series as octane, C8H18? (1) A C4H6 B C4H8 C C4H10 D C4H12 (iii) Write the balanced equation for the c [Show More]

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