AQA 7404/1 AS CHEMISTRY Paper 1 Inorganic and Physical Chemistry

Please write clearly in block capitals.

Centre Candidate
number number


Surname

Forename(s)

Candidate re
signatu

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.
4
 Fill in the boxes at the top of this page.
 Answer all questions. 5
 You must answer the questions in the spaces provided. Do not 6
write outside the box around each page or on blank pages. 7
 If you need extra space for your answer(s), use the lined pages at
8
the end of this book. Write the question number against your
answer(s). Section
 All working must be shown. B
 Do all rough work in this book. Cross through any work TOTAL
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.




IB/M/Jun22/
E7
7404/1

, 2
Do not write
outside the
Section A box


Answer all questions in this
section.


This0 question
1 is about ionisation energies of Group 2 elements.

0 1 .1 Explain why the first ionisation energy of the Group 2 elements
decreases down the group.
[2 marks]




0 1 .2 Give an equation, including state symbols, to represent the process that
occurs when the third ionisation energy of magnesium is measured.
[1 mark]




0 1 .3 Explain why the third ionisation energy of magnesium is much
higher than the second ionisation energy of magnesium.
[2 marks]




5




*02
IB/M/
* Jun22/7404/1

, 3
Do not write
outside the
This0 question
2 is about acid–base titrations. Citric box


acid reacts with sodium hydroxide.

C6H8O7(aq) + 3 NaOH(aq) → Na3C6H5O7(aq) + 3 H2O(l)


0 2 .1 A student makes a solution of citric acid by dissolving some solid citric acid in
water.

Describe a method to add an accurately known mass of solid to a
beaker to make a solution.
[2 marks]




0 2
.2 The student dissolves 0.834 g of citric acid in water and makes the
solution up to 500 cm3

Calculate the concentration, in mol dm–3, of citric acid in this solution.
[3 marks]




Concentration mol dm–3




*03
IB/M/
* Jun22/7404/1

, 4
Do not write
outside the
Turn over ►




*03
IB/M/
* Jun22/7404/1