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Question 19M.2.hl.TZ2.b(ii)

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.2.hl.TZ2.b(ii)
Level hl Paper 2 Time zone TZ2
Command term Compare Question number b(ii) Adapted from N/A
b(ii).
[Maximum mark: 1]
19M.2.hl.TZ2.b(ii)

Ethyne, C2H2, reacts with oxygen in welding torches.

Compare, giving a reason, the length of the bond between the carbon atoms in ethyne with that in ethane, C2H6.

[1]

Markscheme

«ethyne» shorter AND a greater number of shared/bonding electrons

OR

«ethyne» shorter AND stronger bond     [✔]

Examiners report

Surprisingly very few explained the difference in bond length/strength looking at electrons shared and just gave the shorter/triple or longer/single bond answer.

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