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The total mark for this paper is 80. • GCSE Grades: • Grade 9 in Mathematics, English Literature, Chemistry and Design Technology • Grade 8 in Physics and Biology • Grade 7 in English Language, Spanish and Geography Access past papers and mark schemes for various subjects and levels, including Maths, Physics, Biology and Chemistry. The Periodic Table is printed in the question paper. ★ 5. step 1 Hydrated sodium sulfate crystals are weighed. University of Durham - MEng General Engineering. Cambridge International is publishing the mark schemes for the May/June 2022 series for most Cambridge IGCSE, Cambridge International A and AS Level and Cambridge Pre-U components, and some Cambridge O Level components. 4 •xH 2O, are heated, they give off water. 1 Demonstrate knowledge and understanding of scientific ideas. You may use an HB pencil for any diagrams or graphs. CHEMISTRY 0620/42 Paper 4 Theory (Extended) February/March 2022 1 hour 15 minutes You must answer on the question paper. 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Fully qualified teacher with 20 years experience of teaching offers Physics and Maths tuition 4(a)(i) M1 increases (1) M2 decreases (1) M3 increases (1) M4 increases (1) 4 4(a)(ii) forward reaction is endothermic 1 4(b) M1 3 dot and cross bonding pairs (1) M2 All lone pairs correct. Qualified Teacher. PMT is your one-stop shop for exam preparation and revision. Na 2 SO 4 •xH 2 O(s) → Na 2 SO 4 (s) + xH 2 O(g) A student carries out an experiment to determine the value of x in Na 2 SO 4 •xH 2 O. AJ R. Consists of two experiments from different areas of Physics, may be based on physics not included in the syllabus content. Highly experienced Head of Department in top independent school. AS Papers 1 & 2 Module 1: Revision for AQA Chemistry AS and A-Level from 2015, including summary notes, worksheets and past exam questions for each topic and paper. You can find topic tests corresponding to summer 2022 advance information content here. SEND. 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