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THIS IS A NEW SPECIFICATION
ADVANCED SUBSIDIARY GCE CHEMISTRY B (SALTERS)
F331 Chemistry
for Life
Candidates answer on the question paper
Friday 9 January 2009 A calculator may
be used for this paper
Afternoon
OCR Supplied Materials:
· Data Sheet for Chemistry B (Salters)
Duration: 1 hour 15 minutes (inserted)
Other Materials Required:
· Scientific calculator
* F 3 3 1 *
INSTRUCTIONS TO CANDIDATES
· Write your name clearly in capital letters, your Centre Number and Candidate Number in the boxes above.…read more

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You are advised to show all the steps in any calculations.
· The total number of marks for this paper is 60.
4 13
· This document consists of 12 pages. Any blank pages are indicated.…read more

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© OCR 2009
Answer all the questions.
1 Chemists have put forward various models to try to explain atomic structures. Scientific
models
often change in the light of new evidence.
The following diagrams show possible structures for atoms based on different models, A­D.
Model A Model B Model C Model D
(a) Complete the flow diagram by filling in the boxes on the right with the letter corresponding
to
the appropriate model.…read more

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The current model of the atom describes a nucleus containing protons and neutrons
surrounded by electrons in energy levels.
(i) Complete the following table showing the properties of the subatomic particles.
subatomic particle
© OCR 2009
Turn over relative mass relative charge
proton +1
neutron 1
electron negligible
[1]
(ii) Explain why:
· mass numbers of atoms are always whole numbers
· the relative atomic mass of an element may not be a whole number.
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