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OCR 2024 GCSE Combined Science A (Gateway Science) J250/10 Chemistry (Higher Tier) With Marking Scheme Merged
OCR 2024 GCSE Combined Science A (Gateway Science) J250/10 Chemistry (Higher Tier) With Marking Scheme Merged COMBINED SCIENCE A Oxford Cambridge and RSA Tuesday 11 June 2024 – Morning GCSE (9–1) Combined Science A (Gateway Science) J250/10 Chemistry (Higher Tier) Time allowed: 1 hour 10 minutes You must have: H • a ruler (cm/mm) • the Data Sheet for GCSE (9–1) Combined Science A (Chemistry) (inside this document) You can use: • a scientific or graphical calculator • an HB pencil * J 2 5 0 1 0 * Please write clearly in black ink. Do not write in the barcodes. Centre number First name(s) Last name INSTRUCTIONS Candidate number • 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 using a correct method, even if your answer is wrong. INFORMATION • The total mark for this paper is 60. • 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 20 pages. ADVICE • Read each question carefully before you start your answer. 2 Section A You should spend a maximum of 20 minutes on this section. Write your answer to each question in the box provided. 1 Carbon reacts with copper oxide to produce copper. copper oxide + carbon copper + carbon dioxide What is the role of the carbon? A It is a catalyst. B It neutralises the copper oxide. C It oxidises the copper oxide. D It reduces the copper oxide. Your answer 2 A teacher investigates some reactions of chlorine. Why is it important that the teacher does not breathe in chlorine? A Chlorine is highly flammable. B Chlorine is inert. C Chlorine is strongly alkaline. D Chlorine is toxic. Your answer 3 Where do scientists think that the oxygen in the Earth’s atmosphere came from? A Earthquakes B Green plants C Thunderstorms D Volcanic activity Your answer [1] [1] [1] © OCR 2024 3 4 Which of the catalysts is an example of an enzyme?
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