AS -LEVEL MAY 2024 OCR CHEMISTRY
AS -LEVEL B
MAY
PAPER
20242OCR
INCLUDING
CHEMISTRY
AS -LEVEL
MARKB
MAY
SCHEME.pdf
PAPER
20242OCR
INCLUDING
CHEMISTRY
MARKB SCHEME.pdf
PAPER 2 INCLUDING MARK SCHEME.pdf
Tuesday 21 May 2024 – Morning
AS Level Chemistry B (Salters)
H033/02 Chemistry in depth
Time allowed: 1 hour 30 minutes
Turn over
AS -LEVEL MAY 2024 OCR CHEMISTRY
AS -LEVEL B
MAY
PAPER
20242OCR
INCLUDING
CHEMISTRY
AS -LEVEL
MARKB
MAY
SCHEME.pdf
PAPER
20242OCR
INCLUDING
CHEMISTRY
MARKB SCHEME.pdf
PAPER 2 INCLUDING MARK SCHEME.pdf
,AS -LEVEL MAY 2024 OCR CHEMISTRY
AS -LEVEL B
MAY
PAPER
20242OCR
INCLUDING
CHEMISTRY
AS -LEVEL
MARKB
MAY
SCHEME.pdf
PAPER
20242OCR
INCLUDING
CHEMISTRY
MARKB SCHEME.pdf
PAPER 2 INCLUDING MARK SCHEME.pdf
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]
© OCR 2024
AS -LEVEL MAY 2024 OCR CHEMISTRY
AS -LEVEL B
MAY
PAPER
20242OCR
INCLUDING
CHEMISTRY
AS -LEVEL
MARKB
MAY
SCHEME.pdf
PAPER
20242OCR
INCLUDING
CHEMISTRY
MARKB SCHEME.pdf
PAPER 2 INCLUDING MARK SCHEME.pdf
,AS -LEVEL MAY 2024 OCR CHEMISTRY
AS -LEVEL B
MAY
PAPER
20242OCR
INCLUDING
CHEMISTRY
AS -LEVEL
MARKB
MAY
SCHEME.pdf
PAPER
20242OCR
INCLUDING
CHEMISTRY
MARKB SCHEME.pdf
PAPER 2 INCLUDING MARK SCHEME.pdf
3
(b) Sodium chloride and potassium chloride are both white crystalline solids.
A student wants to distinguish between these two solids.
Name a simple laboratory test the student could use and give the results.
Name of test .....................................................................................................................................
Results .............................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
[3]
(c) A student has a solid sample of an unknown ionic chloride.
The student uses the following method to calculate the percentage by mass of chlorine in the
solid:
• Weigh out 0.94 g of solid and dissolve in deionised water.
• Add excess silver nitrate solution so AgCl precipitates.
• Collect and dry the precipitate. It weighs 2.29 g.
(i) Calculate the percentage by mass of chlorine in the unknown solid.
percentage by mass of chlorine = ...................................................... % [3]
(ii) The student fails to dry the AgCl precipitate fully.
What effect would this have on the percentage by mass of chlorine calculated?
Explain your answer.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..................................................................................................................................................... [2]
© OCR 2024 Turn over
AS -LEVEL MAY 2024 OCR CHEMISTRY
AS -LEVEL B
MAY
PAPER
20242OCR
INCLUDING
CHEMISTRY
AS -LEVEL
MARKB
MAY
SCHEME.pdf
PAPER
20242OCR
INCLUDING
CHEMISTRY
MARKB SCHEME.pdf
PAPER 2 INCLUDING MARK SCHEME.pdf
, AS -LEVEL MAY 2024 OCR CHEMISTRY
AS -LEVEL B
MAY
PAPER
20242OCR
INCLUDING
CHEMISTRY
AS -LEVEL
MARKB
MAY
SCHEME.pdf
PAPER
20242OCR
INCLUDING
CHEMISTRY
MARKB SCHEME.pdf
PAPER 2 INCLUDING MARK SCHEME.pdf
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.
(i) Which halide ion is definitely not present?
Give a reason.
..........................................................................................................................................................
..........................................................................................................................................................
..................................................................................................................................................... [2]
(ii) Describe further tests they can do on the precipitate to decide which of the remaining halides is
present.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..................................................................................................................................................... [2]
(f) A group of students carry out experiments in which they mix halogen solutions with solutions of
halides.
(i) The students add aqueous bromine to a solution of a halide. They then shake the resulting
solution with hexane which turns purple.
Name the halide ion present, giving your reasons.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..................................................................................................................................................... [2]
© OCR 2024
AS -LEVEL MAY 2024 OCR CHEMISTRY
AS -LEVEL B
MAY
PAPER
20242OCR
INCLUDING
CHEMISTRY
AS -LEVEL
MARKB
MAY
SCHEME.pdf
PAPER
20242OCR
INCLUDING
CHEMISTRY
MARKB SCHEME.pdf
PAPER 2 INCLUDING MARK SCHEME.pdf
AS -LEVEL B
MAY
PAPER
20242OCR
INCLUDING
CHEMISTRY
AS -LEVEL
MARKB
MAY
SCHEME.pdf
PAPER
20242OCR
INCLUDING
CHEMISTRY
MARKB SCHEME.pdf
PAPER 2 INCLUDING MARK SCHEME.pdf
Tuesday 21 May 2024 – Morning
AS Level Chemistry B (Salters)
H033/02 Chemistry in depth
Time allowed: 1 hour 30 minutes
Turn over
AS -LEVEL MAY 2024 OCR CHEMISTRY
AS -LEVEL B
MAY
PAPER
20242OCR
INCLUDING
CHEMISTRY
AS -LEVEL
MARKB
MAY
SCHEME.pdf
PAPER
20242OCR
INCLUDING
CHEMISTRY
MARKB SCHEME.pdf
PAPER 2 INCLUDING MARK SCHEME.pdf
,AS -LEVEL MAY 2024 OCR CHEMISTRY
AS -LEVEL B
MAY
PAPER
20242OCR
INCLUDING
CHEMISTRY
AS -LEVEL
MARKB
MAY
SCHEME.pdf
PAPER
20242OCR
INCLUDING
CHEMISTRY
MARKB SCHEME.pdf
PAPER 2 INCLUDING MARK SCHEME.pdf
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]
© OCR 2024
AS -LEVEL MAY 2024 OCR CHEMISTRY
AS -LEVEL B
MAY
PAPER
20242OCR
INCLUDING
CHEMISTRY
AS -LEVEL
MARKB
MAY
SCHEME.pdf
PAPER
20242OCR
INCLUDING
CHEMISTRY
MARKB SCHEME.pdf
PAPER 2 INCLUDING MARK SCHEME.pdf
,AS -LEVEL MAY 2024 OCR CHEMISTRY
AS -LEVEL B
MAY
PAPER
20242OCR
INCLUDING
CHEMISTRY
AS -LEVEL
MARKB
MAY
SCHEME.pdf
PAPER
20242OCR
INCLUDING
CHEMISTRY
MARKB SCHEME.pdf
PAPER 2 INCLUDING MARK SCHEME.pdf
3
(b) Sodium chloride and potassium chloride are both white crystalline solids.
A student wants to distinguish between these two solids.
Name a simple laboratory test the student could use and give the results.
Name of test .....................................................................................................................................
Results .............................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
[3]
(c) A student has a solid sample of an unknown ionic chloride.
The student uses the following method to calculate the percentage by mass of chlorine in the
solid:
• Weigh out 0.94 g of solid and dissolve in deionised water.
• Add excess silver nitrate solution so AgCl precipitates.
• Collect and dry the precipitate. It weighs 2.29 g.
(i) Calculate the percentage by mass of chlorine in the unknown solid.
percentage by mass of chlorine = ...................................................... % [3]
(ii) The student fails to dry the AgCl precipitate fully.
What effect would this have on the percentage by mass of chlorine calculated?
Explain your answer.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..................................................................................................................................................... [2]
© OCR 2024 Turn over
AS -LEVEL MAY 2024 OCR CHEMISTRY
AS -LEVEL B
MAY
PAPER
20242OCR
INCLUDING
CHEMISTRY
AS -LEVEL
MARKB
MAY
SCHEME.pdf
PAPER
20242OCR
INCLUDING
CHEMISTRY
MARKB SCHEME.pdf
PAPER 2 INCLUDING MARK SCHEME.pdf
, AS -LEVEL MAY 2024 OCR CHEMISTRY
AS -LEVEL B
MAY
PAPER
20242OCR
INCLUDING
CHEMISTRY
AS -LEVEL
MARKB
MAY
SCHEME.pdf
PAPER
20242OCR
INCLUDING
CHEMISTRY
MARKB SCHEME.pdf
PAPER 2 INCLUDING MARK SCHEME.pdf
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.
(i) Which halide ion is definitely not present?
Give a reason.
..........................................................................................................................................................
..........................................................................................................................................................
..................................................................................................................................................... [2]
(ii) Describe further tests they can do on the precipitate to decide which of the remaining halides is
present.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..................................................................................................................................................... [2]
(f) A group of students carry out experiments in which they mix halogen solutions with solutions of
halides.
(i) The students add aqueous bromine to a solution of a halide. They then shake the resulting
solution with hexane which turns purple.
Name the halide ion present, giving your reasons.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..................................................................................................................................................... [2]
© OCR 2024
AS -LEVEL MAY 2024 OCR CHEMISTRY
AS -LEVEL B
MAY
PAPER
20242OCR
INCLUDING
CHEMISTRY
AS -LEVEL
MARKB
MAY
SCHEME.pdf
PAPER
20242OCR
INCLUDING
CHEMISTRY
MARKB SCHEME.pdf
PAPER 2 INCLUDING MARK SCHEME.pdf
