DP Chemistry (last assessment 2024)

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Question 19M.2.sl.TZ1.5c(ii)

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.2.sl.TZ1.5c(ii)
Level sl Paper 2 Time zone TZ1
Command term Deduce Question number c(ii) Adapted from N/A
c(ii).
[Maximum mark: 2]
19M.2.sl.TZ1.5c(ii)

Both vinegar (a dilute aqueous solution of ethanoic acid) and bleach are used as cleaning agents.

Bleach reacts with ammonia, also used as a cleaning agent, to produce the poisonous compound chloramine, NH2Cl.

(c(ii))

Deduce the molecular geometry of chloramine and estimate its H–N–H bond angle.

 

Molecular geometry:

H–N–H bond angle:

[2]

Markscheme

Molecular geometry:
«trigonal» pyramidal  [✔]

H–N–H bond angle:
107°  [✔]

 

Note: Accept angles in the range of 100–109.

Examiners report

The molecular geometry and bond angles often did not correspond to each other with quite a few candidates stating trigonal planar and then 107 for the angle.

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