*P74326A0116*
Turn over P74326A
©2024 Pearson Education Ltd.
S:1/1/Please check the examination details below before entering your candidate information Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel International Advanced Level
Thursday 18 January 2024
Afternoon (Time: 1 hour 20 minutes)WCH16/01Paperreference Total Marks Chemistry
International Advanced Level
UNIT 6: Practical Skills in Chemistry II
You must have:Scientific calculator, ruler
Instructions
• Use black ink or ball‑point pen.• If pencil is used for diagrams/sketches/graphs it must be dark (HB or B).• Fill in the boxes at the top of this page with your name, centre number and candidate number.• Answer all questions.• Answer the questions in the spaces provided – there may be more space than you need .
Information• The total mark for this paper is 50.• The marks for each question are shown in brackets – use this as a guide as to how much time to spend on each question .• You will be assessed on your ability to organise and present information, ideas, descriptions and arguments clearly and logically, including your use of grammar, punctuation and spelling.
• A Periodic Table is printed on the back cover of this paper.
Advice• Read each question carefully before you start to answer it.• Show all your working in calculations and include units where appropriate.• Try to answer every question.• Check your answers if you have time at the end. *P74326A0216*
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2
Answer ALL the questions. Write your answers in the spaces provided.
1 A student car
ried out some tests on four aqueous solutions, labelled A, B, C and D. Each solution contained one cation and one anion. (a) Complet
e the table.
Test Observation Inference
(i) Dilute aqueous ammonia was added drop‑by‑drop to 4 cm3 of A until there was no further changeA pale blue precipitate formed which dissolved to give a deep blue solutionThe cation in A is
...............................................................(1) (ii) Dilute aqueous ammonia was added drop‑by‑drop to 4 cm3 of B until there was no further changeA white precipitate formed with the first few drops
This precipitate dissolved in excess ammonia to give a colourless solutionThe formula of the white precipitate is
...............................................................
The formula of the complex ion which forms in the colourless solution is
...............................................................(2)
(iii) Dilute aqueous sodium hydroxide was added drop‑by‑drop to 4 cm3 of C until there was no further change...............................................................
...............................................................
...............................................................
...............................................................The cation in C is Fe3+(2)
(iv) Dilute aqueous sodium hydroxide was added drop‑by‑drop to 4 cm3 of D until there was no further changeAn off‑white precipitate formed which did not dissolve in excess but darkened when left to standThe cation in D is
...............................................................(1) (v) Name the type of r
eaction which results in the darkening of the off‑white precipitate in (a)(iv).
(1)
.................................................................................................................................................................................................................................................................................... *P74326A0316* Turn over 3
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DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA (b) Adding dilute nitric acid followed by aqueous silver nitrate to A and B resulted in both f
orming precipitates. The student was not certain, but suggested that the anion in A was the chloride ion and the anion in B was the bromide ion. Sta
te why the student was not certain and outline a further test which could be carried out to confirm the presence of both these anions.
(3)
....................................................................................................................................................................................................................................................................................
.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... (c) The student tested for the anion in C by adding acidified barium nitrate solution and obser
ved a white precipitate. Give the formula of the compound in solution C.
(1)
.................................................................................................................................................................................................................................................................................... (d) The student researched further tests for the anion present in D. A t est was found which involved the addition of sodium hydroxide solution followed by aluminium and then heating strongly. Ammonia gas was given off. Suggest a possible anion present in D.
(1)
....................................................................................................................................................................................................................................................................................
(Total for Question 1 = 12 marks)
Turn over P74326A
©2024 Pearson Education Ltd.
S:1/1/Please check the examination details below before entering your candidate information Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel International Advanced Level
Thursday 18 January 2024
Afternoon (Time: 1 hour 20 minutes)WCH16/01Paperreference Total Marks Chemistry
International Advanced Level
UNIT 6: Practical Skills in Chemistry II
You must have:Scientific calculator, ruler
Instructions
• Use black ink or ball‑point pen.• If pencil is used for diagrams/sketches/graphs it must be dark (HB or B).• Fill in the boxes at the top of this page with your name, centre number and candidate number.• Answer all questions.• Answer the questions in the spaces provided – there may be more space than you need .
Information• The total mark for this paper is 50.• The marks for each question are shown in brackets – use this as a guide as to how much time to spend on each question .• You will be assessed on your ability to organise and present information, ideas, descriptions and arguments clearly and logically, including your use of grammar, punctuation and spelling.
• A Periodic Table is printed on the back cover of this paper.
Advice• Read each question carefully before you start to answer it.• Show all your working in calculations and include units where appropriate.• Try to answer every question.• Check your answers if you have time at the end. *P74326A0216*
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
2
Answer ALL the questions. Write your answers in the spaces provided.
1 A student car
ried out some tests on four aqueous solutions, labelled A, B, C and D. Each solution contained one cation and one anion. (a) Complet
e the table.
Test Observation Inference
(i) Dilute aqueous ammonia was added drop‑by‑drop to 4 cm3 of A until there was no further changeA pale blue precipitate formed which dissolved to give a deep blue solutionThe cation in A is
...............................................................(1) (ii) Dilute aqueous ammonia was added drop‑by‑drop to 4 cm3 of B until there was no further changeA white precipitate formed with the first few drops
This precipitate dissolved in excess ammonia to give a colourless solutionThe formula of the white precipitate is
...............................................................
The formula of the complex ion which forms in the colourless solution is
...............................................................(2)
(iii) Dilute aqueous sodium hydroxide was added drop‑by‑drop to 4 cm3 of C until there was no further change...............................................................
...............................................................
...............................................................
...............................................................The cation in C is Fe3+(2)
(iv) Dilute aqueous sodium hydroxide was added drop‑by‑drop to 4 cm3 of D until there was no further changeAn off‑white precipitate formed which did not dissolve in excess but darkened when left to standThe cation in D is
...............................................................(1) (v) Name the type of r
eaction which results in the darkening of the off‑white precipitate in (a)(iv).
(1)
.................................................................................................................................................................................................................................................................................... *P74326A0316* Turn over 3
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) Adding dilute nitric acid followed by aqueous silver nitrate to A and B resulted in both f
orming precipitates. The student was not certain, but suggested that the anion in A was the chloride ion and the anion in B was the bromide ion. Sta
te why the student was not certain and outline a further test which could be carried out to confirm the presence of both these anions.
(3)
....................................................................................................................................................................................................................................................................................
.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... (c) The student tested for the anion in C by adding acidified barium nitrate solution and obser
ved a white precipitate. Give the formula of the compound in solution C.
(1)
.................................................................................................................................................................................................................................................................................... (d) The student researched further tests for the anion present in D. A t est was found which involved the addition of sodium hydroxide solution followed by aluminium and then heating strongly. Ammonia gas was given off. Suggest a possible anion present in D.
(1)
....................................................................................................................................................................................................................................................................................
(Total for Question 1 = 12 marks)
