Chemistry Paper 2

N10/4/CHEMI/SP2/ENG/TZ0/XX

88106105

CHEMISTRY
STANDARD LEVEL
PAPER 2
Thursday 11 November 2010 (afternoon)

Candidate session number
0

1 hour 15 minutes

0

INSTRUCTIONS TO CANDIDATES
•
•
•
•

Write your session number in the boxes above.
Do not open this examination paper until instructed to do so.
Section A: answer all of Section A in the spaces provided.
Section B:  answer one question from Section B. Write your answers on answer sheets.
Write your session number on each answer sheet, and attach them to this examination paper and your cover sheet using the tag provided.
• At the end of the examination, indicate the numbers of the questions answered in the candidate box on your cover sheet and indicate the number of sheets used in the appropriate box on your cover sheet.

8810-6105

13 pages
© International Baccalaureate Organization 2010

0113

–2–

N10/4/CHEMI/SP2/ENG/TZ0/XX

SECTION A
Answer all the questions in the spaces provided.
1.

The data below are from an experiment to measure the enthalpy change for the reaction of aqueous copper(II) sulfate, CuSO4 (aq) and zinc, Zn (s).
Cu 2+(aq ) + Zn (s) → Cu (s) + Zn 2+(aq )

50.0 cm3 of 1.00 mol dm–3 copper(II) sulfate solution was placed in a polystyrene cup and zinc powder was added after 100 seconds. The temperature-time data was taken from a data-logging software program. The table shows the initial 23 readings.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24

B

C

time / s
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0

Temperature / °C
24.8
24.8
24.8
24.8
24.8
24.8
24.8
24.8
24.8
24.8
24.8
24.8
24.8
24.8
24.8
24.8
24.8
24.8
24.8

Temperature / °C

A

D

E

F

G

H

80

60

40

20

Linear fit for selected data.
T = – 0.050t + 78.0
T Temperature t time
0

100

200

300

400

time /