Chemistry · May / June 2024 · Paper 41 · Question 3
0620
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The question as text
This question is about the elements sodium and fluorine and the compound sodium fluoride.ll
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3(a)[2]
2Na + F2 → 2NaF(2)
M1 NaF(1)
Has to be the only product
M2 equation completely correct(1)
3(b)(i)[1]
electrons move
OR
electrons are mobile
OR
electrons flow
3(b)(ii)[2]
M1 one shared dot and cross(1)
M2 6 non–bonding electrons (either) dots or crosses on each fluorine atom to complete both octets (1)
3(b)(iii)[2]
M1 liquid(1)
M2 BOTH melting point is below –200 °C AND boiling point is above –200 °C(1)
OR
BOTH –200 oC is higher than –220 °C/ melting point AND lower than –188 °C/ boiling point(1)
OR
–200 °C is between melting point or –220 °C and boiling point or
–188 °C(1)
3(b)(iv)[3]
M1 ionic bonds in NaF(1)
M2 attraction between molecules or intermolecular forces in F2(1)
M3 weaker attraction (between particles) in F2 ORA (1)
3(c)(i)[2]
M1 breakdown by (the passage of) electricity(1)
M2 of an ionic compound in molten or aqueous (state) (1)
3(c)(ii)[2]
2H+ + 2e(–) → H2
M1 H+ + e(–) on left hand side(1)
M2 equation fully correct(1)
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