AS
CHEMISTRY
Paper 1 Inorganic and Physical Chemistry
Tuesday 14 May 2024 Morning Time allowed: 1 hour 30 minutes
For Examiner’s Use
Question Mark
1
2
3
4
5
6
7
8
9
Section B
TOTAL
7404/1
, 2
Section A
Answer all questions in this section.
0 1 A student does a series of reactions with aqueous solutions of some
potassium halides (P, Q and R) of equal concentration. Each solution contains a
different halide ion (chloride, bromide or iodide).
The student adds 3 drops of bromine water to 3 drops of each aqueous solution of
potassium halide. The student also adds 3 drops of the bromine water to
3 drops of water.
Table 1 shows the student’s observations.
Table 1
Observation when 3 drops
of bromine water are added
Solution P Orange solution
Solution Q Brown solution
Solution R Orange solution
Water Orange solution
0 1 . 1 Identify the halide ion present in Q.
Give the ionic equation for the reaction that occurs when bromine water is added to Q.
[2 marks]
Halide ion in Q
Ionic equation
IB/M/Jun24/7404/1
, 3
Do not write
outside the
0 1 . 2 Explain, in terms of oxidising ability, why the observations from these reactions box
do not allow the student to identify the halide ion present in P and the halide ion
present in R.
[2 marks]
0 1 . 3 The student does a second experiment to determine the halide ion in each of P and R.
The student adds a few drops of aqueous silver nitrate solution to
2 cm3 of each potassium halide solution.
Table 2 shows the student’s observations.
Table 2
Student’s Observation
P Precipitate formed
R Precipitate formed
Describe a further chemical test that the student can complete on the precipitates
formed to identify the halide ion present in P and the halide ion present in R.
Describe how the observations from this test can be used to identify the halide ion
present in P and the halide ion present in R.
[3 marks]
7
Turn over for the next question
Turn over ►
, 4
0 2 This question is about the elements in Group 2.
0 2 . 1 Explain why the third ionisation energy of beryllium is much higher than the
second ionisation energy of beryllium.
[3 marks]
0 2 . 2 Magnesium reacts slowly with cold water but rapidly with steam.
Compare these reactions, in terms of the products formed.
You should identify one similarity in, and one difference between, these reactions.
[2 marks]
Similarity
Difference
0 2 . 3 The reaction of calcium with water is a redox reaction.
Explain, in terms of oxidation states, why this reaction involves both oxidation
and reduction.
[2 marks]
7
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