Tuesday 21 May 2024 – Morning
AS Level Chemistry B (Salters)
H033/02 Chemistry in depth
Time allowed: 1 hour 30 minutes
Turn over
, 2
1 ‘Lo Salt’ is a reduced-sodium alternative to regular table salt. Some of the sodium chloride is
replaced by potassium chloride.
(a) Two models of the structure of sodium chloride are shown below in Fig. 1.1 and Fig. 1.2.
Fig. 1.1
Na+
Cl –
Fig. 1.2
Na+
Cl –
The two models show different features of the structure.
Complete the table with ticks (✓) where a statement is correct for a model.
Correct for Correct for
Fig. 1.1 Fig. 1.2
Model shows the relative sizes of ions
Model shows how the ions pack together
Model allows all the ions in the model to be seen
[2]
, 4
(d) Give the formula of another aqueous ion (other than Ag+) that would form a precipitate with
chloride ions.
Give the colour of this precipitate.
Ion ....................................................................................................................................................
Colour of precipitate .........................................................................................................................
[1]
(e) Some students have a solution of a sodium halide (chloride, bromide or iodide) to identify. They
add silver nitrate solution and get an off-white/pale yellow precipitate. This enables them to say
that one halide ion is definitely not present.
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