2015-hsc-chemistry PDF

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2015

HIGHER SCHOOL CERTIFICATE EXAMINATION

Chemistry

General Instructions

1020

75 marks Part A – 20 marks Attempt Questions 1–20 Allow about 35 minutes for this part

(C)

(D)

pH less than 7

pH greater than 7

V Salt bridge

aq) Ag+(aq)

Cu u2++(aq) aq)

O O

CH2CH2CH3

10

Which of the equations correctly describes incomplete combustion? 2CO(g) + 3H2 O(l)

(A) C2H5OH(l) + 2O2(g) (B)

C2H5OH(l) +

7 ( ) 2 O2 g

2CO2( g) + 3H2O( l)

(C)

C2H5OH(l) + 3O2(g)

2CO2(g) + 3H2 O(l)

(D) C2H5OH(l) + 2O2( g) 11

C( s) + CO( g) + 3H2O( l)

Two monomers are shown.

HO

H

H

C

C

H

H

O HO

OH

C

O

(CH2)2

C

OH

Which of the following shows a condensation polymer that could be formed from the monomers?

(A)

(B)

(C)

(D)

H

H

O

C

C

C

H

H

HO

C

O

O

(CH2)2

C n

H

H

C

C

H

H

H

H

C

C

H

H

H

H

C

C

H

H

O O

C

O

( CH2)2

C

O O

O

C

OH

O

(CH2)2

C

O n

O O

C

O

( CH2)2

C n

–5–

14 12 10 8 pH 6 4 2 Volume (mL)

River Farmland

Forest

X Village Ocean

Turbidity

1 km

Heat of combustion straight chain alkanol

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© 2015 Board of Studies, Teaching and Educational Standards NSW

2015 HIGHE R S CHOOL CE R T IFICAT E E XAM IN AT IO N

Chemistry Section I (continued) Student Number

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Part B – 55 marks Attempt Questions 21–30 Allow about 1 hour and 40 minutes for this part

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1021

15050

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Question 22 continues on page 16

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End of Question 22

Question 23 (4 marks) Explain how the structure and chemistry of ONE of the following cells determines its cost and practicality.

4

Name of cell: ...........................................................................................................

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Question 25 (7 marks) (a)

Describe the steps involved in the process of addition polymerisation.

3

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(b)

Explain the uses of polyethylene and polystyrene in terms of their structures and properties.

4

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2

Question 26 (continued) (c)

The sodium hydroxide solution was titrated against 25.0 mL samples of 0.100 mol L−1 citric acid. The average volume of sodium hydroxide used was 41.50 mL.

4

Calculate the concentration of the sodium hydroxide solution. ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ...............................................................................................................................

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End of Question 26

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Question 28 (3 marks) The equipment shown is set up. After some time a ring of white powder is seen to form on the inside of the glass tube. Glass tube

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soaked in concentrated hydrochloric acid

(a)

Ring of white powder

soaked in concentrated ammonia

Why would this NOT be an acid–base reaction according to Arrhenius?

1

............................................................................................................................... ...............................................................................................................................

(b)

Explain why this would be considered a Brönsted–Lowry acid–base reaction. Include an equation in your answer.

2

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4

Question 29 (continued) (b)

Calculate the percentage of sulfate in the original fertiliser sample.

3

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End of Question 29

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Percentage yield of ammonia

Pressure

90

500 atm 400 atm 300 atm 200 atm

60

30

0 200

300 400 500 Temperature (°C)

600

Section I Part B extra writing space

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If you use this space, clearly indicate which question you are answering.

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If you use this space, clearly indicate which question you are answering.

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2015 HIGHE R S CHOOL CE R T IFICAT E E XAM IN AT IO N

Chemistry Section II 25 marks Attempt ONE question from Questions 31–35 Allow about 45 minutes for this section

Question 31 continues on page 31

brine Carbon dioxide Ammonia

Reaction vessel

Cooled

Filtered Calcium chloride

End of Question 31

Heated

Sodium carbonate

Question 32 continues on page 33

End of Question 32

Question 33 continues on page 35

COO–

CH3 CH2CH3 CH3 CH CH3 CH2 S S

C

CH2NH 3 +

H O

N

H

NH 3+

End of Question 33

O

CH2 O C

CH2

Question 34 continues on page 37

Electronegativity (Pauling scale)

4.0

3.0

2.0

1.0

2

4

6

8

10 12 14 16 18

Atomic Number

End of Question 34

20

Question 35 continues on page 39

DNA profiles obtained from George, Linda and the three children

George

Linda

Child A

End of paper

Child B

Child C

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© 2015 Board of Studies, Teaching and Educational Standards NSW

Chemistry DATA SHEET

Some standard potentials...