Merit exemplar for Chemistry 90933 2014
Q
1
2
3
4
Grade score
Total score
24
Annotation
M6
This is M6 because in part (c), the candidate has linked the formation of each ion to
the number of electrons lost or gained and has included the resulting charge. In part
(d), the difference in reactivity of the metals has been correctly discussed with
observations and the correct balanced equation. If the candidate had added the
reason for an atom gaining / losing electrons in part (c), they may have accessed an
E7 grade.
M6
This is M6 as for both diamond and graphite, one physical property has been linked to
the bonding within diamond / graphite and subsequently to a use that is named for both
diamond and graphite. The candidate may have gained E7 if they had included an
additional relevant physical property for both diamond and graphite and linked it to the
bonding and use that had been stated already. E8 may have been awarded if the
candidate had also compared and contrasted the allotropes of oxygen more
comprehensively.
M6
This is M6 as the method of collection of ammonia has been linked to its density, the
reason for needing damp litmus paper in ammonia gas has been explained and the
solubility of ammonia gas has been clearly explained. E7 may have been awarded if a
balanced equation had been correctly written.
M6
M6 has been awarded here as the candidate has explained why alloys are stronger
than individual metals. E7 may have been awarded if the property of metal or alloy
had been linked to the specific use given in the context of the question.