Chemistry · May / June 2020 · Paper 42 · Question 2
0620
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The question as text
Fluorine forms both ionic and covalent compounds.ll
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2(a)(i)[3]
magnesium 2.8 (all crosses) (1)
fluorine 2.8 (seven dots and one cross in outer shell) (1)
Mg2+ and F-(1)
2(a)(ii)[1]
MgF2
2(a)(iii)[2]
heat until molten or dissolve in water (1)
moving ions / mobile ions (1)
2(b)[3]
two single bonds (1)
one double bond (1)
six non-bonding electrons on both F atoms and four non- bonding electrons on O atom to complete the octet in each case (1)
2(c)(i)[2]
forces of attraction between oppositely charged ions / ionic bonds (1)
strong / need a lot of energy to break / weaken (1)
2(c)(ii)[2]
forces of attraction between molecules (1)
weak / need a small of energy to break / weaken (1)
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