DP Chemistry (last assessment 2024)

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Question 18N.3.hl.TZ0.5a.ii

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Date November 2018 Marks available [Maximum mark: 2] Reference code 18N.3.hl.TZ0.5a.ii
Level hl Paper 3 Time zone TZ0
Command term Calculate Question number a.ii Adapted from N/A
a.ii.
[Maximum mark: 2]
18N.3.hl.TZ0.5a.ii

A representation of the unit cell of gold is shown.

(a.ii)

Calculate the number of atoms per unit cell of gold, showing your working.

[2]

Markscheme

1 2  «atom per face» × 6 «faces per cube» × 3 «atoms» AND 1 8  «atom per corner» × 8 «corners per cube» = 1 «atom» ✔

«atoms per unit cell = 3 + 1 =» 4 ✔

 

Award [1 max] for “4” without working shown.

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