Mark Scheme (Results) January 2012 - Edexcel
Mark Scheme (Results) January 2012
International GCSE Chemistry (4CH0) Paper 2C
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January 2012 Publications Code UG030257 All the material in this publication is copyright ? Pearson Education Ltd 2012
INTERNATIONAL GCSE CHEMISTRY 4CH0 2C ? JANUARY 2012
Question number 1 (a)
Expected Answer
relative mass
relative charge
Proton 1
Neutron 1
0
Electron -1
1 mark for each correct answer (b) (i) Protons AND electrons = 1
neutrons = 2
(ii) atoms of the same element
with different masses Ignore references to electrons
Accept
Reject
+1
- 1 / one
Zero minus one /negative
one two
atoms with same atomic number / number of protons / proton number
molecules / compounds for first mark only
with different mass numbers / different numbers of neutrons / different neutron numbers
different relative atomic masses for second mark only
Marks 4
1 1 1 1
Question number
Expected Answer
1 (c)
((79 x 50.7) + (81 x 49.3))/100
OR
(79 x 0.50.7) + (81 x 0.493)
Accept
= 79.99 Allow 1 mark for a single transcription error (e.g. 43.9 instead of 49.3) Ignore units such as grams
Correct answer on its own scores 2
Reject
Marks
1 1
Total 10
Question number 2 (a) (i)
(ii) (iii) (iv) (b) (i) (ii)
Answer
B A E C Atomic number Electrons in the outer shell
Accept
Reject
Marks
1 1 1 1 1 1 Total 6
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