OCR Oxford and RSA Monday 20 June 2022 — Morning GCSE (9—1) Chemistry A (Gateway Science) J248/04 Paper 4 (Higher Tier) Time allowed: 1 hour 45 minutes

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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 page... s 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 32 pages. ADVICE • Read each question carefully before you start your answer. © OCR 2022 [601/8663/X] DC (ST/SG) 308811/4 Monday 20 June 2022 – Morning GCSE (9–1) Chemistry A (Gateway Science) J248/04 Paper 4 ( Higher Tier) Time allowed: 1 hour 45 minutes 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 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] 2 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] 3 © OCR 2022 Turn over 3 Which functional group does a monomer need to contain to form addition polymers? A B C D C C O O C C C H O H Your answer [1] 4 Which test identifies sulfate ions? A A flame test B Adding a few drops of barium chloride solution C Adding a few drops of silver nitrate solution D Adding a few drops of sodium hydroxide solution Your answer [1] 4 © OCR 2022 5 A student investigates the reaction between sodium thiosulfate solution and dilute hydrochloric acid. They want to find out how temperature changes the rate of reaction. The diagram shows their experiment. Add dilute hydrochloric acid and start timing Sodium thiosulfate solution Cross drawn on piece of paper disappears Which two variables should the student keep constant in the experiment? Variables A temperature volume of hydrochloric acid B time volume of sodium thiosulfate C volume of hydrochloric acid time D volume of hydrochloric acid volume of sodium thiosulfate Your answer [1] 6 Why are balloons filled with helium gas able to float in the air? A Helium is colourless. B Helium is in Group 0 and is unreactive. C Helium has a low boiling point. D Helium has a low density. Your answer [1] 5 © OCR 2022 Turn over 7 The table shows some of the advantages and disadvantages of using hydrogen/oxygen fuel cells to power vehicles. Advantage Disadvantage A do not produce greenhouse gases hydrogen fuel comes from hydrocarbons, which are fossil fuels B hydrogen fuel comes from the electrolysis of water, which uses electricity no moving parts C hydrogen is a gas and stored in a large tank hydrogen is explosive D only by-products are water and heat fuel cells do not go ‘flat’ Which row in the table is correct? Your answer [1] 8 Which gases is the Earth’s early atmosphere thought to have contained? A Carbon dioxide and oxygen B Carbon dioxide and water vapour C Methane and oxygen D Nitrogen and oxygen Your answer [1] 6 © OCR 2022 9 A student reacts dilute hydrochloric acid with marble chips. Carbon dioxide gas is made. • The student repeats the experiment with different size marble chips. • They use 20g of marble chips in each experiment. The graph shows the student’s results A B C D Volume of carbon dioxide (cm3) Time (s) Which line shows the result for the smallest marble chips? Your answer [1] 10 Which statement about polymerisation is correct? A Amino acid monomers make polymers called proteins by addition polymerisation. B DNA is a polymer made from four identical monomers called nucleotides. C Polyesters are condensation polymers made from monomers containing carboxylic acid and alcohol functional groups. D Poly(ethene) is a polymer made from ethene monomers by condensation polymerisation. Your answer [1] 7 © OCR 2022 Turn over 11 Sodium, in Group 1, reacts with fluorine in Group 7. Sodium fluoride is made. What is the balanced symbol equation for the reaction? A Na + F NaF B 2Na + F2 2NaF C Na + F2 NaF2 D 2Na + F Na2F Your answer [1] 12 Which type of material is glass? A Alloy B Ceramic C Composite D Polymer Your answer [1] 13 Phytoextraction is used to extract metals from their compounds. Which statement about phytoextraction is correct? A Involves growing plants in soil that contains metal compounds B Involves heating the metal compounds with carbon C Uses bacteria to separate metals from their compounds D Uses electricity to separate metals from their compounds Your answer [1] 8 © OCR 2022 14 The actual yield in a reaction is often less than the predicted yield. Why? A One reactant is in excess. B One reactant is the limiting reactant. C The reaction has an atom economy of less than 100%. D The reaction is reversible and does not go to completion. Your answer [1] 15 How is iron protected from corrosion by sacrificial protection? A Iron is coated in a more reactive metal, like magnesium, which is more readily reduced than iron. B Iron is coated in a more reactive metal, like tin, which loses electrons more readily than iron. C Iron is coated in a more reactive metal, like zinc, which gains electrons more readily than iron. D Iron is coated in a more reactive metal, like zinc, which is more readily oxidised than iron. Your answer [1] 9 © OCR 2022 Turn over BLANK PAGE PLEASE DO NOT WRITE ON THI [Show More]

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