Mark Scheme (Results) January 2012 - Edexcel
Mark Scheme (Results) January 2012
International GCSE Chemistry (4CH0) Paper 2C
Edexcel and BTEC Qualifications Edexcel and BTEC qualifications come from Pearson, the world's leading learning company. We provide a wide range of qualifications including academic, vocational, occupational and specific programmes for employers. For further information, please call our GCE line on 0844 576 0025, our GCSE team on 0844 576 0027, or visit our qualifications website at . For information about our BTEC qualifications, please call 0844 576 0026, or visit our website at btec.co.uk. If you have any subject specific questions about this specification that require the help of a subject specialist, you may find our Ask The Expert email service helpful. Ask The Expert can be accessed online at the following link:
Alternatively, you can speak directly to a subject specialist at Pearson about Edexcel qualifications on our dedicated Science telephone line: 0844 576 0037 Pearson: helping people progress, everywhere Our aim is to help everyone progress in their lives through education. We believe in every kind of learning, for all kinds of people, wherever they are in the world. We've been involved in education for over 150 years, and by working across 70 countries, in 100 languages, we have built an international reputation for raising achievement through innovation in education. Find out more about how we can help you and your students at: uk
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
................
................
In order to avoid copyright disputes, this page is only a partial summary.
To fulfill the demand for quickly locating and searching documents.
It is intelligent file search solution for home and business.
Related download
- chemistry paper 2 sl tz1 2012 markscheme
- chemistry paper cisce
- level 2 chemistry 91165 2012 nzqa
- 2012 hsc examination chemistry
- indian national chemistry olympiad theory 2012
- physical sciences paper 2 chemistry grade 12 terms
- iit jee 2012 paper 1
- university of cambridge international examinations
- class ix chemistry cisce
- level 2 chemistry 91166 2012 nzqa
Related searches
- net scheme hk
- monthly income scheme in bank
- monthly income scheme calculator
- sbi monthly income scheme calculator
- monthly income scheme in india
- monthly income scheme 2019 best
- monthly income scheme post office
- data classification scheme examples
- 0580 scheme of work 2020
- rhyme scheme finder
- mis scheme of post office
- pairing scheme 10th class 2019