AQA
AS
CHEMISTRY
7404/1
Paper 1 Inorganic and Physical Chemistry
Version: 1.0 Final
*JUN237404101*
IB/M/Jun23/E7 7404/1
For Examiner’s
... [Show More] Use
Question Mark
1
2
3
4
5
6
7
8
Section B
TOTAL
Tuesday 16 May 2023 Morning Time allowed: 1 hour 30 minutes
Materials
For this paper you must have:
• the Periodic Table/Data Sheet, provided as an insert (enclosed)
• a ruler with millimetre measurements
• a scientific calculator, which you are expected to use where appropriate.
Instructions
• Use black ink or black ball-point pen.
• Fill in the boxes at the top of this page.
• Answer all questions.
• You must answer the questions in the spaces provided. Do not write outside
the box around each page or on blank pages.
• 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).
• All working must be shown.
• Do all rough work in this book. Cross through any work you do not
want to be marked.
Information
• 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.
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
AS
CHEMISTRY
Paper 1 Inorganic and Physical Chemistry
2
*02*
IB/M/Jun23/7404/1
Do not write
outside the
Section A box
Answer all questions in this section.
0 1 This question is about the elements in Period 3.
0 1 . 1 Give the full electron configuration of the element in Period 3 with the highest
first ionisation energy.
[1 mark]
0 1 . 2 Give an equation, including state symbols, to represent the process that occurs when
the second ionisation energy of sodium is measured.
[1 mark]
0 1 . 3 Table 1 shows some successive ionisation energies for an element in Period 3.
Table 1
Ionisation number 1 2 3 4 5 6 7 8
Ionisation energy /
kJ mol–1 1000 2260 3390 4540 6990 8490 27100 31700
Identify the Period 3 element.
Explain your answer.
[3 marks]
Element
Explanation
5
3
*03*
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IB/M/Jun23/7404/1
Do not write
outside the
box 0 2 This question is about the elements in Group 2.
0 2 . 1 Describe the structure and bonding in magnesium.
[2 marks]
0 2 . 2 State the trend in the atomic radius of the elements down Group 2 from Mg to Ba
Give a reason for this trend.
[2 marks]
Trend
Reason
0 2 . 3 Give an equation, including state symbols, for the reaction of magnesium with steam.
State two observations for this reaction.
[3 marks]
Equation
Observation 1
Observation 2
Question 2 continues on the next page
4
*04*
IB/M/Jun23/7404/1
Do not write
outside the
box 0 2 . 4 The sulfates of the elements in Group 2 from Mg to Ba have different solubilities.
State the formula of the least soluble of these sulfates.
Give a use for this sulfate.
[2 marks]
Formula
Use
0 2 . 5 A sample of strontium is made up of only three isotopes: 86Sr, 87Sr and 88Sr
This sample contains 83.00% by mass of 88Sr
This sample of strontium has Ar = 87.73
Calculate the percentage abundance of each of the other two isotopes in this sample.
[4 marks]
% abundance 87Sr =
% abundance 86Sr =
5
*05*
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IB/M/Jun23/7404/1
Do not write
outside the
box 0 2 . 6 Mg(OH)2 is used as an antacid to treat indigestion.
A student does an experiment to determine the percentage by mass of Mg(OH)2 in an
indigestion tablet.
40.0 cm3 of 0.200 mol dm–3 HCl (an excess) is added to 0.200 g of a powdered tablet.
The mixture is swirled thoroughly.
All of the Mg(OH)2 reacts with HCl as shown.
Mg(OH)2 + 2HCl → MgCl2 + 2H2O
The amount of HCl remaining after this reaction is determined by titration with
0.100 mol dm–3 NaOH
29.25 cm3 of 0.100 mol dm–3 NaOH are [Show Less]