OCR Oxford Camtyidge and RSA Monday 20 June 2022 — Morning GCSE (9—1) Chemistry A (Gateway Science) J248/02 Paper 2 (Foundation Tier) Time allowed: 1 hour 45 minutes

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Monday 20 June 2022 – Morning GCSE (9–1) Chemistry A (Gateway Science) J248/02 Paper 2 (Foundation Tier) Time allowed: 1 hour 45 minutes You must have: • a ruler (cm/mm) • the Data Shee... t for GCSE (9–1) Chemistry A (inside this document) You can use: • a scientific or graphical calculator • an HB pencil *J24802* INSTRUCTIONS • Use black ink. You can use an HB pencil, but only for graphs and diagrams. • Write your answer to each question in the space provided. If you need extra space use the lined pages at the end of this booklet. The question numbers must be clearly shown. • Answer all the questions. • Where appropriate, your answer should be supported with working. Marks might be given for a correct method, even if the answer is wrong. INFORMATION • The total mark for this paper is 90. • The marks for each question are shown in brackets [ ]. • Quality of extended response will be assessed in questions marked with an asterisk (*). • This document has 28 pages. ADVICE • Read each question carefully before you start your answer. © OCR 2022 [601/8663/X] DC (ST/SG) 322109/5 R 2 © OCR 2022 SECTION A Answer all the questions. You should spend a maximum of 30 minutes on this section. Write your answer to each question in the box provided. 1 Chlorine and iodine are Group 7 elements. Chlorine Iodine A green gas purple gas B pale yellow gas grey-black solid C green gas grey-black solid D pale yellow gas purple gas Which row in the table describes these elements at room temperature? Your answer [1] 2 What is the test for oxygen gas? A Ignites with a squeaky pop. B Limewater turns milky. C Relights a glowing splint. D Turns damp blue litmus paper white. Your answer [1] 3 What is an enzyme? A A catalyst found in living organisms. B A man-made catalyst. C A non-biological catalyst. D A substance which makes a catalyst more efficient. Your answer [1] 3 © OCR 2022 Turn over 4 Bromine water is used to test between ethane and ethene. Ethane Ethene A bromine water is decolourised no colour change B bromine water goes cloudy bromine water is decolourised C bromine water goes clear no colour change D no colour change bromine water is decolourised Which row in the table gives the correct test results? Your answer [1] 5 What is the displayed formula of propanoic acid? H A B C D H C C O O O C C C C H H O H C H H H H H H H H H C H H C C H H H H H C H H O H Your answer [1] 4 © OCR 2022 6 DNA molecules are polymers made from monomers. What are the monomers called? A Alkenes B Amino acids C Carbohydrates D Nucleotides Your answer [1] 7 Crude oil is separated into useful chemicals by fractional distillation. The diagram shows the useful chemicals made in fractional distillation. Crude oil Diesel oil Kerosene Petrol Fuel oil Bitumen Gases Which of these chemicals has the largest molecules? A Bitumen B Diesel oil C Gases D Petrol Your answer [1] 5 © OCR 2022 Turn over 8 Which statement describes dynamic equilibrium? A Occurs in a closed system and the backward reaction is faster than the forward reaction. B Occurs in a closed system and the forward reaction is faster than the backward reaction. C Occurs in a closed system and the rates of the forward and backward reactions are equal. D Occurs in an open system and the rates of the forward and backward reactions are equal. Your answer [1] 9 The rate of the reaction between marble chips and dilute hydrochloric acid is increased by breaking the marble chips into smaller pieces. Why does this increase the rate of reaction? A The marble chips act as a catalyst. B The marble chips have a greater concentration. C The marble chips have a larger surface area. D The marble chips move faster. Your answer [1] 10 Copper carbonate, CuCO3, decomposes when heated. Copper oxide, CuO, is made. Carbon dioxide is a waste product. CuCO3 CuO + CO2 What is the atom economy of the reaction? Relative molecular mass (Ar ): CuCO3 = 123.5 CuO = 79.5 CO2 = 44.0 A 28.7% B 35.6% C 64.4% D 155.3% Your answer [1] 6 © OCR 2022 11 The list shows the reactivity series of some metals. The non-metal element carbon is also included. most reactive sodium magnesium potassium aluminium carbon zinc iron lead silver least reactive Extracted from its ore by electrolysis Extracted from its ore by heating with carbon A magnesium silver B silver potassium C sodium aluminium D zinc aluminium Which row in the table is correct? Your answer [1] 12 Why is magnesium more reactive with dilute acids than zinc? A Magnesium forms positive ions more easily than zinc. B Magnesium forms negative ions more easily than zinc. C Magnesium gains electrons more easily than zinc. D Magnesium gains hydrogen more easily than zinc. Your answer [1] 7 © OCR 2022 Turn over 13 What is the test for halide ions? A Add a few drops of dilute nitric acid then a few drops of silver nitrate solution. B Add a few drops of hydrochloric acid then a few drops of barium chloride solution. C Add a few drops of hydrochloric acid then a few drops of silver nitrate solution. D Add a few drops of sodium hydroxide solution. Your answer [1] 14 Large molecules produced by fractional distillation are cracked to make smaller molecules. Octane, C8H18, is cracked to form ethene, C2H4, and one other product. What is the formula of the other product? A C3H6 B C6H12 C C6H14 D C8H16 Your answer [1] 15 Dilute hydrochloric acid reacts with marble chips. Dilute hydrochloric acid Balance Beaker Marble chips Which statement about the reaction is correct? A The reaction is faster after 10 seconds than it is after 3 seconds. B The reaction slows down with time. C The reaction proceeds at a constant rate. D The mass of the beaker and its contents stay the same. Your answer [1] 8 © OCR 2022 SECTION B Answer all the questions. 16 The table shows information about some compounds of carbon. Compound Formula A CH4 B C2H4 C C2H6 D C3H6 E C3H8 (a) Some of the compounds belong to the homologous series called the alkanes. Which hydrocarbons are alkanes? Tick (3) three boxes. A B C D E [3] (b) Which homologous series do the compounds which are not alkanes belong to? Tick (3) one box. Alcohols Alkenes Carboxylic acids Esters [1] (c) Compound B, C2H4, burns completely in oxygen. State the names of the two products of this reaction. ................................................................... and ................................................................... [2] 9 © OCR 2022 Turn over (d) Compound A is obtained from crude oil by fractional distillation. Complete the sentences about fractional distillation. Use words from the list. cracked colder condense evaporate fractions heated hotter polymers Crude oil is ........................................... as it enters a fractionating column. The vapours get ........................................... as they rise. The vapours ........................................... to a liquid at different points. The separated parts of crude oil are called ........................................... . [4] (e) Crude oil is a finite resource. Explain what is meant by a finite resource [Show More]

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