2013-2014 Chemistry 1st Term Exam Marker’s Report
Section B:
1. (a) Fairly answered. A few students failed to spell evaporation correctly.
(b) (i) Some students answered salt / common salt / table salt instead of the
proper nature of chemical is required
(ii) Well answered
(c) Poorly answered
(d) (i) Fairly answered. A few students wrongly answered oxygen instead
of hydrogen and hence lose marks in the other parts of this question.
(ii) No mark for missing description of test (e.g. pop sound test instead of
(e)
2.
(a)
(b)
(c)
(d)
(e)
3.
(a)
(b)
(c)
using a burning splint) or observation of positive result.
Quite a lot of students used ‘clean’ instead of sterilize.
Poorly answered. Some answered calcium instead of calcium carbonate.
A lot of students answered ‘ Effervescences’ and ‘gas bubbles’ and score 1
mark only.
Poorly answered.
Poorly answered. A few students can identify that it involves density but
failed to note that gas X should have a HIGHER density than air.
Well answered.
Well answered. A few students did not count the correct number of
outermost electrons and a few students mixed up the concepts of group /
period number.
Part (i) scores 0 if using 6 instead of VI.
Poorly answered. Some students just mentioned that the metals reacts
with oxygen / water but failed to mention the function of oil. Some
students did not mention the proper chemical involved.
Well answered.
4.
(a), (b) Poorly answered.
(c) Fairly answered.
(d) Fairly answered. Only a few students can score both marks.
5.
(a),(b)
(c) (i)
Well answered.
Some students mixed the concept of same group elements and
isotopes. They stated similar chemical properties instead of same
(d)
(e)
6.
(a)
chemical properties.
(ii) Fairly answered. Allow students used H instead of D for deuterium.
(iii) Poorly answered.
Fairly answered. A lot of students are able to identify the interaction
between water and ions.
(i) Poorly answered
(ii) Poorly answered. Some students failed to include the charge for the
structure.
Poorly answered.
Some students mentioned iron rust. Some stated the product instead of
describing the obervation.
Very weak in writing chemical equations. Some students gave word
(b)
equations instead.
(i) Poorly answered.
(ii) Poorly answered. Only a few students are able to completely
describe the account that diamond is a non-conductor.