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7 (a) Displacement reactions occur between metals and metal ions. Displacement reactions can be used to determine the order of reactivity of metals such as lead (Pb), nickel (Ni), and silver (Ag). The ionic equation for a displacement reaction is shown. 2+2+

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8/3/2021· Similarly, the positive calcium ions will move towards the hode where they will lose electrons (reduced) to form a metal that is deposited on the surface of the electrode (graphite in this case). Note: Platinum and graphite (a form of carbon) are used to make Inert electrodes because do not react with the products and the electrolyte.

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(iv) Explain why experiments of this type cannot be used to find the position of aluminium in the reactivity series. [2] (b) Potassium and calcium are very reactive metals at the top of the series. Because their ions have different charges, K+ and Ca2+ heated. [2]

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ion formula of ion mass of ion in 100 cm3milk / mg calcium Ca2+125 chloride Cl −120 magnesium Mg2+ 12 negative ions of organic acids 160 phosphate PO. 4 3− 95 potassium K+140 sodium Na+ 58 sulfate SO. 4 2− 30. (i)Calculate the mass of calcium ions present in a 20 cm 3sample of this milk. mass of calcium ions = ..

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8/3/2021· Similarly, the positive calcium ions will move towards the hode where they will lose electrons (reduced) to form a metal that is deposited on the surface of the electrode (graphite in this case). Note: Platinum and graphite (a form of carbon) are used to make Inert electrodes because do not react with the products and the electrolyte.

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22/3/2015· Explain: (i) Alkali metals are soft and can be cut with help of a knife. (ii) Potassium is more reactive than sodium. how_to_reg Follow thu_up Like (2) visibility Views (19.9K) edit Answer

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In all the experiments mentioned in this question, the calcium carbonate was in excess. (a)a)Explain how you could determine the mass of carbon dioxide given off in the fi rst fi ve minutes. (ii) Label the graph F where the reaction rate is the fastest, S where it is

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(c) This question is based on typical reactions of butan-1-ol. (i) When butan-1-ol, CH 3 –CH 2 –CH 2 –CH 2 –OH, is passed over the alyst silicon( IV ) oxide, water is lost.

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Select region | Siyavula

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