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(iii) Explain why alkanes and alkenes do not appear in the Periodic Table. 1] (c) Complete Fig. 5.3 to show the bonding electrons in one molecule of methane, CH

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Explain why the presence of coke ensures the maximum yield of the metal chloride. [2] (c) Explain why the change, titanium(IV) chloride to titanium, is reduction.

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5.1 explain how the methods of extraction of the metals in this section are related to their positions in the reactivity series Metal Way of extraction potassium sodium calcium magnesium aluminium extract by electrolysis carbon zinc iron tin lead extract by reaction

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FREE Chemistry revision notes on Extraction of Metals. Designed by the teachers at SAVE MY EXAMS for the CIE IGCSE Chemistry 0620 / 0971 syllabus. Extraction of aluminium Aluminium is a reactive metal which sits above carbon on the reactivity series.

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2 · Explain why it is important to recycle these metals, rather than put them in general waste. [6 marks] Edexcel question courtesy of Pearson Eduion Ltd.

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19/5/2016· 8 Neodymium is a metal used in powerful magnets. (a) One stage in the extraction of neodymium from its ore is to heat neodymium fluoride with calcium. The table shows the melting points of the substances in this stage of the extraction. Melting point in C

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(a) Explain why the gases from stage 2 must be removed for the safety of the workers. [1] (b) Explain why the same two-stage process cannot be used to extract sodium from sodium carbonate, Na 2CO 3. [2] (c) Industrial processes release large amounts of

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Explain why farmers spread fertilisers on the soil where they are going to grow crops. .. metal oxide ease of reduction calcium oxide not reduced by carbon at 1600 C magnesium oxide reduced by carbon at 1600 C nickel(II) oxide reduced by carbon at 350 C

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(iii) Explain why alkanes and alkenes do not appear in the Periodic Table. 1] (c) Complete Fig. 5.3 to show the bonding electrons in one molecule of methane, CH

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calcium 10.5 (i) State three factors that the student should keep constant in each experiment. (3) 1 2 3 (ii) Using information from the table, state the relationship between the reactivity of a metal and the temperature rise. (1) (iii) State why there is no (1)

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(iii) Explain why alkanes and alkenes do not appear in the Periodic Table. 1] (c) Complete Fig. 5.3 to show the bonding electrons in one molecule of methane, CH

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4 LES 2019 06204219 3 This question is about phosphorus and compounds of phosphorus. (a) Phosphorus has the formula P 4. Some properties of P 4 are shown. melting point / C 45 boiling point / C 280 electrical conductivity non-conductor solubility in water

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Question paper 2

Question paper 2 Level IGCSE(9-1) Subject Chemistry Exam Board Edexcel IGCSE Module Double Award (Paper 1C) Topic Inorganic Chemistry Sub-Topic Extraction and uses of metals Booklet Question paper 2 Time Allowed: 60 minutes Score: /50 9 8

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Oxygen atoms form both covalent and ionic bonds. (a) Water is formed when two atoms of hydrogen coine with one atom of oxygen. (i) Draw a dot and cross diagram of a molecule of water. You need only show the electrons in the outer shells. (2) (ii) Explain how the covalent bonds in the water molecule hold the hydrogen and oxygen atoms together.