IGCSE真题.pdf
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Centre Number Candidate Number Write your name here Surname Other names Total Marks Paper Reference Turn over P42863A 2014 Pearson Education Ltd. 1/1/1/1/1/1/ *P42863A0132* Chemistry Unit: KCH0/4CH0 Science (Double Award) KSC0/4SC0 Paper: 1C Tuesday 14 January 2014 Morning Time: 2 hours KCH0/1C 4CH0/1C KSC0/1C 4SC0/1C Y ou must have: Calculator Ruler 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 120. 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. Keep an eye on the time. Write your answers neatly and in good English. Try to answer every question. Check your answers if you have time at the end. Pearson Edexcel Certificate Pearson Edexcel International GCSE2 *P42863A0232*3 *P42863A0332* Turn over Answer ALL questions. 1 Rock salt is a mixture of salt and sand. Crystals of pure salt can be obtained from rock salt by using the method below. Use words from the box to complete the sentences. You may use each word once, more than once or not at all. (5) crystals dissolve evaporate filter solution solvent Grind the rock salt into a fine powder. Add the powder to hot water and stir to . the salt. Filter the mixture. The salt . passes through the filter paper leaving behind the sand. Boil the filtrate to . some of the water. Leave the saturated solution to cool so that . of salt form. Finally, . the cold mixture to separate the crystals from the remaining solution. (Total for Question 1 = 5 marks)4 *P42863A0432* 2 The three states of matter are solid, liquid and gas. The diagram shows how the particles are arranged in each of these states. solid liquid gas (a) Use words from the box to show the changes of state labelled X, Y and Z. You may use each word once, more than once or not at all. (3) boiling condensing crystallisation diffusion freezing X . Y . Z . (b) Which statement best describes the movement of the particles in a gas? (1) A The particles vibrate about fixed positions. B The particles slide past one another. C The particles move freely. D The particles do not move at all. Z melting X Y5 *P42863A0532* Turn over (c) The diagram shows apparatus that can be used to measure the melting point of a solid. The solid is placed in a small tube. The small tube is then put into a liquid contained in a beaker. The liquid is gently heated and the temperature at which solid Q melts is recorded. (i) Give the name of the apparatus labelled P . (1) . (ii) Solid Q melts at 140 C. Explain why water is not a suitable liquid to use in this experiment. (1) . . (iii) Suggest why the liquid in the beaker needs to be stirred constantly. (1) . . (Total for Question 2 = 7 marks) stirrer liquid small tube solid Q P heat6 *P42863A0632* 3 Air is a mixture of gases. The table gives the formulae of three gases and their approximate percentage by volume in a sample of dry, unpolluted air. Gas Percentage by volume CO 2 0.04 N 2 78 O 2 21 (a) (i) Give the names of the two main gases in the sample of air. (1) . and . (ii) Give the name of the gas that makes up most of the remaining 0.96% of the air. (1) . (b) State a use for N 2 (1) . . (c) Give the name of a gas present in polluted air that causes acid rain. (1) .7 *P42863A0732* Turn over (d) A student used this apparatus to find the percentage by volume of oxygen in a sample of air. She used this method. place some wet iron wool in the bottom of a test tube invert the test tube in a beaker containing water measure the height of the column of air in the test tube leave the test tube for one week measure the new height of the column of air The table shows her results. Initial height of column of air in mm 80 Final height of column of air in mm 63 (i) Some of the iron turned into rust. Write a word equation for this reaction. (2) . (ii) Use the students results to calculate the percentage of oxygen in this sample of air. (2) Percentage of oxygen . wet iron wool column of air water8 *P42863A0832* (e) The student left the apparatus for another week and measured the height of the column of air again. From this measurement, how could she tell whether all of the oxygen in the test tube had been used up in the first week? (1) . . (Total for Question 3 = 9 marks)9 *P42863A0932* Turn over 4 This is a description of how the orange colouring can be extracted from rose petals. crush the petals using a pestle and mortar add the crushed petals to some ethanol in a beaker heat to about 60 C and stir to produce an orange solution separate the orange solution from the petals (a) (i) Suggest why ethanol is used instead of water. (1) . . (ii) Ethanol is a flammable liquid. Suggest how it could be heated safely. (1) . . (iii) How could the orange solution be separated from the petals? (1) . (b) The orange colouring is analysed using chromatography and is found to consist of two different colours, red and yellow. The diagram shows the chromatography paper at the start of the experiment. Complete the diagram to show a possible result at the end of the experiment. (2) start end (Total for Question 4 = 5 marks) solvent front orange colouring solvent front10 *P42863A01032* 5 This apparatus can be used to make and collect carbon dioxide. This is done by adding dilute hydrochloric acid to calcium carbonate. (a) Give the names of the pieces of apparatus labelled A, B and C. (3) A . B . C . dilute hydrochloric acid calcium carbonate A B C water11 *P42863A01132* Turn over (b) When an excess of carbon dioxide is bubbled through limewater, reaction 1 occurs, followed by reaction 2. The equations for these reactions are reaction 1 Ca(OH) 2 (aq) + CO 2 (g) CaCO 3 (s) + H 2 O(l) reaction 2 CaCO 3 (s) + H 2 O(l) + CO 2 (g) Ca(HCO 3 ) 2 (aq) Suggest two observations that would be made when excess carbon dioxide is bubbled through limewater. (2) 1 . . 2 . . (c) Carbon dioxide is used in some fire extinguishers because it does not support combustion. State another property of carbon dioxide that makes it suitable for use in fire extinguishers. (1) . . (d) Carbon dioxide is slightly soluble in water. The solution formed has a pH of 5.6 Which is the best description of a solution of carbon dioxide in water? (1) A strongly acidic B strongly alkaline C weakly acidic D weakly alkaline (Total for Question 5 = 7 marks)12 *P42863A01232* 6 The table gives some data about the first six members of a homologous series of compounds called the alkanes. Alkane Molecular formula Relative formula mass Boiling point in C methane CH 4 16 164 ethane C 2 H 6 30 87 propane C 3 H 8 44 42 butane C 4 H 10 0 pentane C 5 H 12 72 hexane 86 69 (a) Complete the table by giving the molecular formula of hexane giving the relative formula mass of butane suggesting the boiling point of pentane (3) (b) What does the data show about the relationship between boiling point and relative formula mass? (1) . . . (c) The molecular formula of ethene is C 2 H 4 Ethene and ethane are in different homologous series. Explain how the formulae of these compounds show that they are in different series. (1) . .13 *P42863A01332* Turn over (d) (i) In the table, draw displayed formulae for the two alkanes with the molecular formula C 4 H 10 (2) Displayed formula 1 Displayed formula 2 (ii) What is the name given to compounds that have the same molecular formula but different displayed formulae? (1) . (e) The reaction between ethane and bromine (Br 2 ) is similar to the reaction between methane and bromine. (i) Write a chemical equation for the reaction between ethane and bromine. (2) . (ii) What is the name given to the type of reaction that occurs when ethane reacts with bromine? (1) . (iii) Suggest the condition necessary for this reaction to occur. (1) . (Total for Question 6 = 12 marks)14 *P42863A01432* 7 Distress flares are used to attract attention in an emergency. The flares contain magnesium, which burns with a bright, white flame to form magnesium oxide. (a) The reaction between magnesium and oxygen is exothermic. What is meant by the term exothermic? (1) .- 配套讲稿:
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