Multiple Choice Answers - Science Skool!50]_multiple_choice_answers.pdfMultiple Choice Answers MARK...

Multiple Choice

Answers

MARK SCHEME – A-level Chemistry – Specimen paper 3

Section B In this section, each correct answer is awarded 1 mark.

Question Key AO Question Key AO

6 A AO3 1b 21 B AO1a

7 B AO2f 22 B AO1a

8 D AO2d 23 D AO2h

9 D AO2d 24 B AO1a

10 B AO2b 25 C AO1a

11 A AO2b 26 C AO1a

12 D AO1b 27 C AO3 1a

13 B AO2d 28 D AO1a

14 C AO2h 29 B AO3 1a

15 B AO1b 30 D AO3 1a

16 D AO2c 31 B AO1a

17 D AO2c 32 C AO3 1b

18 A AO3 1b 33 D AO2a

19 B AO3 1a 34 C AO3 1a

20 D AO3 1a 35 C AO1a

6CH01/01 Section A Question Number

Correct Answer

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1 C 1

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2 D 1

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3 A 1

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4 B 1

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5 A 1

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6 (a) B 1

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6 (b) A 1

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6 (c) D 1

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7 B 1

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8 D 1

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9 A 1

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10 C 1

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11 C 1 Question Number

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12 A 1

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13 D 1

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14 (a) A 1

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14(c) B 1

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14 (d) B 1

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15 C 1


Correct Answer Reject Mark



2 A 1 Question Number


3 D 1 Question Number






6 B 1 Question Number






9(a) A 1 Question Number


9(b) C 1 Question Number




10(b) D 1

Question Number






13(a) D 1 Question Number


13(b) B 1 Question Number


13(c) C 1 Question Number




15 (a) B 1 Question Number


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20 C 1

6CH01/01 1101

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4 (b) C 1 Question Number

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8 (c) D 1 Question Number

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14 B 1

TOTAL FOR SECTION A = 20 MARKS

6CH02/01 1101


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9 D 1

6CH02/01 1101

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10 (b) D 1 Question Number

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12 A 1


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1 (b) B 1

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2 D 1

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3 D 1

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8 B 1

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12 D 1

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13 A 1

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14 D 1


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1 B 1

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2 D 1

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3 B 1

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4 C 1

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5 A 1

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6 D 1

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7 C 1

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9 B 1

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10 D 1

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Number

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11 A 1

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12 B 1

6CH01_01 1201

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13(a) C (1) 2 13(b) D (1)

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14 D 1

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18 C 1

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19 A 1


6CH02_01 1201


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1 (a) B 1

(b) D 1

(c) A 1

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2 C 1

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3 B 1

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4 D 1

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5 C 1

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6 A 1

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7 A 1

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8 C 1

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10 B 1

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11 B 1

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13 B 1

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16 (a) C 1

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17 D 1


6CH04_01 1201



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8 D 1

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12 D 1

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15 D 1

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2 D 1

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3 A 1

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4 B 1

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6 B 1

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7 C 1

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8 D 1

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10 B 1

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11 C 1

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12 A 1

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13 C 1

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14 B 1

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15 C 1

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18 D 1

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12 D 1

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14 C 1

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15 C 1

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16(a) D 1 (b) D 1 (c) C 1 (d) B 1 (e) B 1



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13 C 1

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20 C 1


Section A

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1(a) A 1

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1(b) C 1

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2 B 1

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3 D 1

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4 D 1

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5 B 1

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6(a) C 1

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6(b) B 1

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6(c) D 1

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7 A 1

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8 C 1

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9 B 1

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10 C 1

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11 D 1

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12(a) B 1

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13 A 1

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14 A 1


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1(a) C 1 (b) A 1

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2(a) C 1 (b) A 1 (c) B 1

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6(a) D 1 (b) C 1 (c) A 1

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11 D 1

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13(a) D 1 (b) B 1 (c) A 1

TOTAL FOR SECTION = 20 MARKS

6CH01/01 Section A

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1 A 1

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2 C 1

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3 C 1

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4 B 1

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5 D 1

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6 B 1

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7 B 1

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8 D 1

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9 A 1

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10 A 1

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11 B 1

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12 A 1

8CH01 GCE ChemistrySummer 2009 5

Question Number


13 C 1

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14 B 1

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15 A 1

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16 B 1

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17 D 1

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18 C 1

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11 D 1


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19 B 1



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4(b) D 1 Question Number

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9 C 1

6CH01_01 1006

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14 (c) C 1

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11 A 1

6CH02_01 1006

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18 B 1

6CH02_01 1006


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1 (c) A 1 Question Number

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8 B 1

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16 A 1

3 6CH05_01 1006


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12 D 1

4 6CH05_01 1006

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20 D 1

6CH01_01 1106


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9 C 1

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15 B 1



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1 C 1

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2 (a) B 1

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2 (b) C 1

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2 (c) D 1

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3 C 1

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4 B 1

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5 B 1

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6 A 1

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7 D 1

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8 A 1

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9 A 1

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10 D 1

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11 C 1

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12 (a) B 1

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12 (b) C 1

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12 (c) D 1

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13 A 1

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14 D 1

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15 B 1

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16 C 1


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1 C 1

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2 D 1

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3 A 1

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4 A 1

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6 C 1

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7 C 1

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8 (a) C 1

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9 A 1

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12 B 1

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13 A 1

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14 D 1



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1 (a) D 1

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1 (b) B 1

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1 (c) A 1

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2 B 1

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6 C 1

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7 A 1

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1 (a) B 1 (b) C 1 (c) D 1

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2 (a) C 1 (b) D 1

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11 C 1

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13 (a) C 1 (b) B 1

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16 A 1



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1 D 1 2 B 1 3 a C 1 3 b B 1 4 C 1 5 A 1 6 a B 1 6 b C 1 7 A 1 8 a A 1 8 b C 1 9 B 1 10 D 1 11 a D 1 11 b A 1 12 a A 1 12 b C 1 12 c D 1 12 d B 1 13 B 1 Total for Section A 20 marks

Section B Question Number


14 (a)(i)

Ka = [CH3CO2−] [H+]/[CH3CO2H]

OR Ka = [CH3CO2

−] [H3O+]/[CH3CO2H] OR Use of [CH3COO−] instead of [CH3CO2

−] and [CH3COOH] instead of [CH3CO2H] IGNORE state symbols even if wrong

Numerator as [H+]2

Expressions in terms of HA alone Round/curved brackets ‘()’ Any other carboxylic acid

1

Question Number


14(a)(ii) 1.7 x 10-5 = [H+]2 / 0.5 [H+] = √1.7 x 10-5 x 0.5 / 2.915(476) x

10−3 (1)

pH = (-log[H+]) = 2.53529 OR = 2.54 OR = 2.5 (1) ALLOW TE for second mark from any hydrogen ion concentration as long as pH less than 7 Correct answer alone scores (2) ALLOW pH = 2.53 if [H+] is rounded to 2.92 x 10−3 IGNORE sf except 1

4.77 or 4.8 from using pH = -log Ka loses both marks

2

Question Number


14(a)(iii) 20 (cm3) IGNORE units OR 0.02 dm3

1


Correct Answer

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1 D 1 2 C 1 3 A 1 4(a) D 1 4(b) A 1 5(a) C 1 5(b) D 1 5(c) C 1 6 B 1 7 A 1 8 D 1 9(a) D 1 9(b) A 1 9(c) D 1 9(d) C 1 10(a) B 1 10(b) B 1 11(a) B 1 11(b) D 1

11(c) A

1

Total for section A 20

marks



12(a)(i) (3 x -120) = -360 (kJ mol-1) IGNORE ∆H, and case of letters in units e.g allow Kj

No sign or + sign in answer, ie 360/+360 Any other wrong units ∆E

1

Question Number


*12(a)(ii) • ( Bonding in) benzene/it is more stable (than Kekule) by 152 kJ mol-1 (consequential on (a)(i))

(1) IGNORE sign

• π /p/double bond electrons are delocalized (around the ring)

OR six p electrons shared between six (ring) carbon atoms OR delocalized because of overlap of p orbitals OR resonance hybrid of C=C’s and C-C’s (1)

• Substitution reactions (rather

than addition) (1)

NOTE: Nucleophilic substitution negates the substitution mark because it is wrong additional information

• Maintains/regains delocalized

system OR maintains/regains stability OR maintains/regains stabilization energy (1)

Attack by electrophiles with no mention of substitution

4

























12 A 1

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16a D 1 Question Number


16b C 1 Question Number


16c A 1 Question Number


16d D 1 Question Number


17 B 1

Total for Section A = 20 Marks


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20 C 1


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1(a) C 1 (b) A 1

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3 C 1

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5(a) B 1 (b) C 1 (c) B 1

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16 D 1


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10 B 1 SECTION A = 20 MARKS

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7 (b) D 1 Section A = 20 marks

1406 6CH05_01 Tuesday, 08 July 2014 17:33:47


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12(c) B 1

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Section B Q13 (a) PENALISE USE OF CH3COOH / ‘ethanoic acid’ [instead of propanoic acid] once only. ALLOW ‘NaOH’ for ‘KOH’, however. Question Number


13 (a)(i)

Q13 (a) PENALISE USE OF CH3COOH / ‘ethanoic acid’ [instead of propanoic acid] once only. ALLOW ‘NaOH’ for ‘KOH’, however. 1st mark: Identification of buffer Any mention of buffer / buffering (region)

(1) IGNORE references to shape / gradient of graph 2nd mark: Identification of species present responsible for buffering action (Both) propanoic acid and propanoate (ions) present OR (Both) propanoic acid and potassium propanoate present OR (Both) a weak acid and its salt/conjugate base are present OR (Both) CH3CH2COOH and CH3CH2COO− present OR (Both) HA and A− are present Can be awarded from an equation

(1)

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20 B 1

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21a(i) Ni: (1s2 2s22p6 ) 3s23p6 3d8 4s2 (1)

Cu: (1s2 2s22p6 ) 3s23p6 3d104s1 (1) ALLOW capital letters, subscripts for superscripts ALLOW 4s before 3d Penalise omission of 3s23p6 once only if rest is correct

2

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21a*(ii) First electron removed is from 4s (in both atoms) (1) Second electron in Cu (is harder to remove so it is) EITHER closer to nucleus/in inner shell OR less shielded (1) IGNORE Comments about second electron being in full shell/ in a 3d shell/in a 3d orbital Reference to 3d10 stability

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21a(iii) (attraction on (3d) electrons increases due to) number of protons increasing / nuclear charge increasing IGNORE The charge density of the 2+ ions increases Effective nuclear charge

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