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AS level paper 1 Chemistry 2021
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AS level paper 1 Chemistry 2021
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AS
CHEMISTRY
Paper 1 Inorganic and Physical Chemistry
Time allowed: 1 hour 30 minutes
Materials
For this paper you must have: For Examiner’s Use
• the Periodic Table/Data Sheet, provided as an insert (enclosed)
• a ruler with millimetre measurements Question Mark
• a scientific calculator, which you are expected to use where appropriate. 1
2
Instructions
3
• Use black ink or black ball-point pen.
• Fill in the boxes at the top of this page. 4
• Answer all questions. 5
• You must answer the questions in the spaces provided. Do not write outside 6
the box around each page or on blank pages.
7
• If you need extra space for your answer(s), use the lined pages at the end of
this book. Write the question number against your answer(s). 8
• All working must be shown. 9
• Do all rough work in this book. Cross through any work you do not
10
want to be marked.
Section B
Information TOTAL
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 80.
Advice
You are advised to spend about 65 minutes on Section A and 25 minutes on Section B.
*JUN217404101*
IB/M/Jun21/E7 7404/1
, 2
Do not write
outside the
Section A box
Answer all questions in this section.
0 1 This question is about atomic structure.
0 1 . 1 Figure 1 is a model proposed by Rutherford to show the structure of an atom.
Figure 1
State two features of the current model that are not shown in the Rutherford model.
[2 marks]
Feature 1 of the current model
Feature 2 of the current model
*02*
IB/M/Jun21/7404/1
, 3
Do not write
outside the
0 1 . 2 A sample of tin is analysed in a time of flight mass spectrometer. box
The sample is ionised by electron impact to form 1+ ions.
Table 1 shows data about the four peaks in this spectrum.
Table 1
m/z Percentage abundance
112 22.41
114 11.78
117 34.97
120 To be determined
Give the symbol, including mass number, of the ion that reaches the detector first.
Calculate the relative atomic mass of tin in this sample.
Give your answer to 1 decimal place.
[4 marks]
Symbol of ion
6
Relative atomic mass
Turn over ►
*03*
IB/M/Jun21/7404/1
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