Chemistry · Oct / Nov 2023 · Paper 42 · Question 2
0620
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The question as text
Cobalt and copper are transition elements. 63 6
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Show the answer and mark scheme
2(a)(i)[3]
59Co
65Cu2+
protons
27
29
neutrons
32
36
electrons
27
27
one mark for each correct row
2(a)(ii)[2]
M1 (63 × 70) + (65 × 30) = 6360 (1)
M2 6360 / 100 = 63.6 (1)
2(b)[2]
M1 (high) density (1)
M2 (high) melting point (1)
2(c)(i)[2]
M1 water molecules (1)
M2 (the water present) in hydrated crystals (1)
2(c)(ii)[2]
M1 pink (1)
M2 CoCl2∙6H2O (1)
2(c)(iii)[2]
M1 white (1)
M2 blue (1)
2(c)(iv)[1]
heating (the hydrated copper(II) sulfate)
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