Chemistry · Oct / Nov 2021 · Paper 42 · Question 5
0620
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The question as text
Iron is a transition element. Potassium is a Group I element.
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Show the answer and mark scheme
5(a)[4]
metallic (1)
(lattice of) positive ions (1)
sea of / delocalised / mobile electrons (1)
attraction between positive ions and electrons (1)
5(b)(i)[1]
malleability / malleable
5(b)(ii)[1]
(particles) slide (over each other)
5(b)(iii)[1]
unreactive
5(c)[2]
high(er) density
high(er) melting points
5(d)(i)[4]
Na – yellow (1)
K – lilac (1)
colourless solution (1)
clear idea of increased reactivity in both reactions (1)
5(d)(ii)[1]
hydrogen
5(d)(iii)[1]
potassium hydroxide
any number in the range 7< pH ⩽ 14
5(d)(iv)[1]
The answer is a drawing: see the picture of this mark scheme row.
5(d)(v)[2]
4Na + O2 → 2Na2O
Na2O (1) correct equation (1)
5(e)(i)[2]
N2 + 3H2 → 2NH3
species (1) correct equation (1)
5(e)(ii)[2]
450 °C (1)
200 atm (1)
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