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Pearson Edexcel A-Level Chemistry Advanced Subsidiary/Advanced Level UNIT 2: Energetics, Group Chemistry, Halogenoalkanes and Alcohols January 2024 Authentic Marking Scheme Attached10,10 €
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Centre Number Candidate Number
Pearson Edexcel International Advanced Level
Tuesday 16 January 2024
Morning (Time: 1 hour 30 minutes) Paper
reference WCH12/01
Chemistry
International Advanced Subsidiary/Advanced Level
UNIT 2: Energetics, Group Chemistry,
Halogenoalkanes and Alcohols
You must have: Total Marks
Scientific calculator, Data Booklet
Instructions
• Use black ink or ball-point pen.
• IfFillpencil is used for diagrams/sketches/graphs it must be dark (HB or B).
• centrein the boxes at the top of this page with your name,
number and candidate number.
• Answer all questions.
• Answer the questions in the spaces provided
– there may be more space than you need.
• Show all your working in calculations and include units where appropriate.
Information
• The total mark for this paper is 80.
• The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• structure
In the question marked with an asterisk (*), marks will be awarded for your ability to
your answer logically, showing how the points that you make are related or
follow on from each other where appropriate.
• There is a Periodic Table on the back cover of this paper.
Advice
• Read each question carefully before you start to answer it.
• Try to answer every question.
• Check your answers if you have time at the end. Turn over
, SECTION A
Answer ALL the questions in this section.
You should aim to spend no more than 20 minutes on this section.
For each question, select one answer from A to D and put a cross in the box . If you change
your mind, put a line through the box and then mark your new answer with a cross .
1 Which compound has intermolecular hydrogen bonding?
A HF
B H2Te
C AsH3
D SnH4
(Total for Question 1 = 1 mark)
2 In which process are intermolecular hydrogen bonds broken?
A H2(g) → 2H(g)
B H2O(l) → H2O(g)
C H2(l) → H2(g)
D H2(g) + ½O2(g) → H2O(g)
(Total for Question 2 = 1 mark)
3 A compound contains
• molecules with non-polar bonds
• permanent dipole-permanent dipole forces between its molecules.
What could be the formula of this compound?
Use the Data Booklet as a source of information.
A NO
B BeCl2
C PH3
D CI4
(Total for Question 3 = 1 mark)
2
, 4 Which alkane has the strongest London forces in the liquid phase?
A (CH3)4C
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
B CH3CH2CH2CH2CH3
C (C2H5)4C
D CH3(CH2)7CH3
(Total for Question 4 = 1 mark)
5 In which liquid solvent would the solubility of lithium chloride (LiCl) be lowest?
A ammonia
B cyclohexane
C methanol
D water
(Total for Question 5 = 1 mark)
6 Which compound does not contain an element with an oxidation number of –1?
A HF
B NaH
C H2O2
D CH4
(Total for Question 6 = 1 mark)
7 Which reaction involves the oxidation of a Group 7 element?
A Br2 + F2 → 2BrF
B U + 3ClF3 → UF6 + 3ClF
C 2F2 + 2H2O → 4HF + O2
D KCl + H2SO4 → HCl + KHSO4
(Total for Question 7 = 1 mark)
Use this space for any rough working. Anything you write in this space will gain no credit.
3
, 8 Equal volumes of some 0.01 mol dm–3 solutions were mixed.
Which pair of solutions gave the greatest mass of precipitate?
A BaCl2 and AgNO3
B BaCl2 and Ag2SO4
C BaCl2 and NaNO3
D BaCl2 and Na2SO4
(Total for Question 8 = 1 mark)
9 Which test reagent could be used to identify an aqueous solution containing
hydrogencarbonate ions, HCO3– ?
A sodium carbonate
B sodium hydroxide
C nitric acid
D ammonia
(Total for Question 9 = 1 mark)
10 Bromine, Br2(l), can be disposed of safely by reaction with
aqueous sodium thiosulfate, Na2S2O3(aq).
Br2(l) + 2Na2S2O3(aq) → 2NaBr(aq) + Na2S4O6(aq)
What is the minimum volume, in cm3, of 0.5 mol dm–3 Na2S2O3(aq) needed to react
completely with 0.01 mol of Br2(l)?
A 0.01
B 0.04
C 10
D 40
(Total for Question 10 = 1 mark)
Use this space for any rough working. Anything you write in this space will gain no credit.
4
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