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#O C R AS Level Chemistry B (Salters) H033/02 Chemistry in depth May 2023
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#O C R AS Level Chemistry B (Salters) H033/02 Chemistry in depth May 2023
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#O C RAS Level Chemistry B (Salters)
H033/02 Chemistry in depth
May 2023
Time allowed: 1 hour 30 minutes
You must have:
the Data Sheet for Chemistry B
You can use:
a scientific or graphical calculator
an HB pencil
*
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined pages at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be
given for using a correct method, even if your answer is wrong.
INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 16 pages.
ADVICE
• Read each question carefully before you start your answer.
2023 Turn over
, 2
1 This question is about Group 2 compounds.
Group 2 hydroxides can be used to neutralise acidity in a variety of contexts. Magnesium
hydroxide may be used to neutralise excess stomach acidity and calcium hydroxide may be used
to neutralise acidity in soils.
The hydroxides are formed when the oxides react with water.
(a) Write an equation to show the ions formed when calcium oxide reacts with water.
[1]
(b) A student shakes a small amount of magnesium oxide in a test tube with water. A
white suspension is formed.
The student then adds dilute hydrochloric acid, drop by drop with shaking, until no further
changes are seen.
Describe how the appearance of the contents of the test tube changes during the addition of
the acid.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
............................................................................................................................................ [2]
(c) Barium chloride solution is used to test for the presence of sulfate ions in solution.
Write an ionic equation for this test.
Include state symbols.
[2]
2023
, 3
(d) A student is provided with a solid sample of an unknown Group 2 hydroxide, X(OH)2.
The student describes how 250 cm3 of a solution of this solid is made up in a volumetric
flask.
Step 1 The mass of a weighing boat is measured and recorded.
Step 2 Solid is added to the boat and the new mass measured and recorded.
Step 3 The contents of the boat are tipped into a beaker.
Step 4 Deionised water is added.
Step 5 The mixture is stirred using a glass rod until all of the solid is dissolved.
Step 6 The glass rod is removed.
Step 7 The solution is poured through a funnel into the volumetric flask.
Step 8 The solution is made up to the mark with deionised water.
Step 9 The flask is stoppered and inverted several times.
Step 10 The concentration of the solution is calculated.
Describe two errors in this practical procedure made by the student and state the effect of
each error on the concentration of the solution.
Error ..........................................................................................................................................
...................................................................................................................................................
Effect on concentration .............................................................................................................
...................................................................................................................................................
Error ..........................................................................................................................................
...................................................................................................................................................
Effect on concentration .............................................................................................................
...................................................................................................................................................
[4]
2023 Turn over
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