ADVANCED General Certificate of Education 2011 Chemistry Assessment Unit A2 2 assessing Analytical, Transition Metals, Electrochemistry and Further Organic Chemistry [AC222] FRIDAY 27 MAY, AFTERNOON 71 Centre Number Candidate Number 7441 AC222 TIME 2 hours. INSTRUCTIONS TO CANDIDATES Write your Centre Number and Candidate Number in the spaces provided at the top of this page. Answer all fifteen questions. Answer all ten questions in Section A. Record your answers by marking the appropriate letter on the answer sheet provided. Use only the spaces numbered 1 to 10. Keep in sequence when answering. Answer all five questions in Section B. Write your answers in the spaces provided in this question paper. INFORMATION FOR CANDIDATES The total mark for this paper is 120. Quality of written communication will be assessed in question 13(d)(iii). In Section A all questions carry equal marks, i.e. two marks for each question. In Section B the figures printed down the right-hand side of pages indicate the marks awarded to each question or part question. A Periodic Table of Elements (including some data) is provided. 111319 Total Marks For Examiner’s use only Question Marks Number Section A 1–10 Section B 11 12 13 14 15
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ADVANCEDGeneral Certificate of Education
2011
Chemistry
Assessment Unit A2 2assessing
Analytical, Transition Metals, Electrochemistry and Further Organic Chemistry
[AC222]
FRIDAY 27 MAY, AFTERNOON
71
Centre Number
Candidate Number
7441
AC222
TIME
2 hours.
INSTRUCTIONS TO CANDIDATES
Write your Centre Number and Candidate Number in the spaces provided at the top of this page.Answer all fifteen questions.Answer all ten questions in Section A. Record your answers by marking the appropriate letter on the answer sheet provided. Use only the spaces numbered 1 to 10. Keep in sequence when answering.Answer all five questions in Section B. Write your answers in the spaces provided in this question paper.
INFORMATION FOR CANDIDATES
The total mark for this paper is 120.Quality of written communication will be assessed in question 13(d)(iii).
In Section A all questions carry equal marks, i.e. two marks for each question.In Section B the figures printed down the right-hand side of pages indicate the marks awarded to each question or part question.A Periodic Table of Elements (including some data) is provided.
111319
TotalMarks
For Examiner’s use only
Question Marks Number
Section A
1–10
Section B
11
12
13
14
15
7441 2 [Turn over
Examiner Only
Marks Remark
Section A
For each of the questions only one of the lettered responses (A–d) is correct.
Select the correct response in each case and mark its code letter by connecting the dots as illustrated on the answer sheet.
1 Chlorine has two isotopes, chlorine-35 and chlorine-37. Which one of the following is the number of peaks found in the mass
spectrum of chlorine gas?
A 2 B 3 C 4 d 5
2 The mechanism for the nitration of benzene is described as
A electrophilic addition. B electrophilic substitution. C nucleophilic addition. d nucleophilic substitution.
3 Copper(II) ions form a coloured complex with the ligand L. The following absorbances were recorded on mixing different volumes of 0.05 M copper(II) sulfate and 0.1 M ligand L.
volume of 0.05 M CuSO4(aq)/cm3
volume of 0.1 M L(aq)/cm3 absorbance
3.0 7.0 0.412
4.0 6.0 0.457
5.0 5.0 0.406
6.0 4.0 0.335
7.0 3.0 0.251
Which one of the following is the cation to ligand ratio in this complex?
A 1:2 B 1:3 C 2:3 d 3:2
7441 3 [Turn over
Examiner Only
Marks Remark
4 In which one of the following is a metal in the +2 state?
A [Ag(nH3)2]
B [Co(nH3)5Br]2
C K4Fe(Cn)6 d K2Cr2O7
5 An organic compound X contains carbon, hydrogen and oxygen only. When 1.29 g of X is burnt completely, 3.30 g of carbon dioxide and 1.35 g of water are formed. Which one of the following is the empirical formula of X?
A CH2O B C2H6O C C4H8O d C5H10O
6 Which one of the following is the relative molecular mass of 2,4-dichloro-3,5-dimethylphenol?
A 190 B 191 C 192 d 196
7 Given the following standard electrode potentials:
E
φ
/V V3(aq) e V2(aq) 0.26 SO4
2(aq) 2H(aq) 2e SO32(aq) H2O(l) 0.17
VO2(aq) 2H(aq) e V3(aq) H2O(l) 0.34 Fe3(aq) e Fe2(aq) 0.77 VO2
(aq) 2H(aq) e VO2(aq) H2O(l) 1.00
Which one of the following reagents will convert V3+(aq) to VO2+(aq)?
A Aqueous iron(II) ions B Aqueous iron(III) ions C Aqueous sulfate ions in acidic solution d Aqueous sulfite ions
7441 4 [Turn over
Examiner Only
Marks Remark
8 Which one of the following is the volume of water which must be added to 30.0 cm3 of 0.25 mol dm3 sulfuric acid to produce 0.05 mol dm3 sulfuric acid?
A 30 cm3
B 120 cm3
C 150 cm3
d 270 cm3
9 Which one of the following is the total number of electrons involved in bonding in benzene?
A 12 B 18 C 24 d 30
10 The concentration of aqueous magnesium ions may be determined by titration with standard edta using Eriochrome Black T as indicator. Which one of the following is the colour change at the end point?
A Blue to green B Blue to red C Red to blue d Red to green
7441 5 [Turn over
Examiner Only
Marks Remark
Section B
Answer all five questions in the spaces provided.
11 Lysine (2,6-diaminohexanoic acid) has the formula
H2n(CH2)4CH(nH2)COOH
The molecule is optically active and may undergo polymerisation.
12 Chromium is a transition metal which was discovered by Louis Vauquelin in 1797. He was able to detect traces of chromium in precious gems, such as ruby and emerald.
(a) State the electronic structure of a chromium atom and explain why the arrangement is stable.
(c) Chromium trioxide, CrO3, is formed by the reaction between excess concentrated sulfuric acid and a concentrated solution of potassium dichromate. Potassium sulfate and water are formed as by-products.
13 The first person to extract ethanoic acid from vinegar was the alchemist Jabir ibn Hayyan Geber (c. 721–815 AD). However the pure compound was not produced for another ten centuries.
(a) The mass spectrum of ethanoic acid shows a distinct peak at m/e 59. State the formula of the species giving rise to this peak.
(b) Ethanoic acid reacts with ethanol to form the ester ethyl ethanoate, CH3COOC2H5. The n.m.r. spectrum of ethyl ethanoate consists of three sets of peaks as shown below.
(iii) Ethanamide is hydrolysed by either hydrochloric acid or sodium hydroxide to form different organic products. State the formula of the organic product in each case.
(i) describe, with observations, how you could confirm the presence of aqueous iron(III) ions, following the oxidation of iron(II) ions, without interference from manganese(II) ions.
(ii) 25.0 cm3 of an acidified iron(II) ethanedioate solution required 32.2 cm3 of 0.025 mol dm3 of potassium manganate(VII) solution for complete reaction. Calculate the concentration, in mol dm3, of the iron(II) ethanedioate solution.
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