Pearson Edexcel Level 1/Level 2 GCSE (9-1) Chemistry Paper 1

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Answer ALL questions. Write your answers in the spaces provided. Some questions must be answered with a cross in a box . If you change your mind about an answer, put a line through the box and then ... mark your new answer with a cross . 1 Alloy steels are made when iron is alloyed with other transition metals such as cobalt and chromium. (a) Which row of the table shows the typical properties of a transition metal? (1) used as a catalyst density colour of metal chloride A yes high colourless B no low colourless C yes high coloured D no low coloured (b) Figure 1 shows the chain on a bicycle. chain Figure 1 Explain how lubricating the chain with oil prevents corrosion of the steel chain. (2) ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... .....................................................................................................................................................................................................................................................................................3 *P52476A0328* Turn over DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA (c) Iron fences can be galvanised by coating them with a layer of zinc. When the layer of zinc is scratched exposing the iron to the weather, the iron does not rust. Explain why the exposed iron does not rust. (2) ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... (d) Metals have high melting points. Explain, in terms of their structure and bonding, why metals have high melting points. (2) ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... (Total for Question 1 = 7 marks)4 *P52476A0428* DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA 2 (a) Salts of metals can be prepared by reacting the metal with an acid to produce the salt and hydrogen. (i) Describe the test to show the gas is hydrogen. (2) ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... (ii) Nickel is a metal. Explain how the structure of a nickel atom, Ni, changes when it forms a nickel ion, Ni2+. (2) ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... (b) A nickel sulfate solution is made by dissolving 23.5 g of nickel sulfate to make 250 cm3 of solution. Calculate the concentration of the solution in g dm−3. (2) ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... ..................................................................................................................................................................................................................................................................................... concentration [Show More]

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