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(b) Aluminium oxide is an ionic compound with a high melting point. (i) Complete the dot-and-cross diagram to show the electron arrangement in one of the oxide ions present in aluminium oxide. Include the charge on the oxide ion. One of the aluminium ions is shown. Al O 3+ ..... [2] (ii) The melting point of aluminium oxide is above 2000 °C.
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papers.xtremepape.rsCambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge. BLANK PAGE
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papers.xtremepape.rsCambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge. 11 (a) To ensure the safety of workers in laboratories where radioactive sources are used, describe
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papers.xtremepape.rs(c) 50 students study at least one of the subjects geography (G ), mathematics (M ) and history (H ). 18 study only mathematics. 19 study two or three of these subjects. 23 study geography. The Venn diagram below is to be used to show this information. G M H x x x 7..... ˜ (i) Show that x = 4. [2] (ii) Complete the Venn diagram. [2]
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papers.xtremepape.rsCambridge International General Certificate of Secondary Education MATHEMATICS 0580/41 Paper 4 (Extended) October/November 2018 2 hours 30 minutes Candidates answer on the Question Paper. Additional Materials: Electronic calculator Geometrical instruments Tracing paper (optional) READ THESE INSTRUCTIONS FIRST
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papers.xtremepape.rshydrogen chloride gas damp blue litmus paper The damp red litmus paper in apparatus 1 changed colour after 30 seconds. How long does it take for the damp blue litmus paper to change colour in apparatus 2? A 64 seconds B 30 seconds C 21 seconds D The blue litmus paper would not change colour. 2 Chromatography is a technique used to separate ...
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papers.xtremepape.rs(ii) The family spend 15% of their New Zealand dollars on a tour. Calculate the number of dollars they have left. $ ..... [2] (iii) The family visit two waterfalls, the ... Water flows over the Browne Falls at a rate of 3680 litres per second. After rain, this rate increases to 9752 litres per second. ...
GRE Practice Test 1: Quantitative Reasoning
papers.xtremepape.rs7780, 1-866-387-8602 (toll free for test takers in the United States, U.S. Territories, and Canada). E-mail: stassd@ets.org. Important Notes In the actual test, your scores for the multiple-choice sections will be determined by the number of questions you answer correctly. Nothing is subtracted from a score if you answer a question incorrectly.
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papers.xtremepape.rs(ii) Use your knowledge of structure and bonding to explain why carbon dioxide is a gas at room temperature and pressure, whereas silicon(IV) oxide is a solid. ... Write the ionic half-equation for the reaction occurring at the zinc electrode in cell 1. ...
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papers.xtremepape.rs(b) Fig. 10.2 shows a horizontal copper wire PQ between two opposite magnetic poles. Q P copper wire A N S Fig. 10.2 A circuit is made by connecting a sensitive digital ammeter between P and Q. The wire PQ is then moved vertically downwards. (i) State and explain what is observed on the ammeter.
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papers.xtremepape.rsCambridge International Examinations Cambridge International General Certificate of Secondary Education *0105482266* BIOLOGY 0610/42 Paper 4 Theory (Extended) February/March 2017 1 hour 15 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST
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