Chemistry · May / June 2022 · Paper 41 · Question 3
0620
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This question is about sodium and compounds of sodium.
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3(a)(i)[3]
positive ions / cations (1)
sea of electrons / mobile electrons / delocalised electrons (1)
attraction between positive ions and electrons (1)
3(a)(ii)[1]
electrons move /
electrons mobile /
electrons flow
3(b)(i)[1]
ionic
3(b)(ii)[1]
ions move /
ions are mobile /
ions flow
3(c)(i)[1]
pipette
3(c)(ii)[1]
yellow to orange
3(c)(iii)[1]
at least two results are within 0.2 cm3 or less
3(c)(iv)[3]
0.005 / 5 × 10–3 (1)
0.0025 / 2.5 × 10–3 (1)
0.125 (1)
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