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SAMPLE

ICAS Science Sample Paper J © UNSW Global Pty Limited 2

1. The two graphs below show what scientists believe were the concentrations of nitrogen and carbon dioxide in the atmosphere between 4 500 million and 2 000 million years ago.

4500 4000 3500 3000 2500 2000Time (millions of years ago)

4500 4000 3500 3000 2500 2000 1500Time (millions of years ago)

atm

osph

ere

(%)

0

20

40

60

80

Car

bon

diox

ide

in E

arth

’sat

mos

pher

e (%

)

0

20

40

60

80

Nitr

ogen

in E

arth

’s

There was a time in history when carbon dioxide and nitrogen were present in equal percentages in the atmosphere.

At what time did this occur?

(A) 2 000 million years ago (B) 3 500 million years ago(C) 4 200 million years ago (D) 4 500 million years ago

3 ICAS Science Sample Paper J © UNSW Global Pty Limited

2. Some molecules are mirror images of each other. They cannot be rotated or moved so that one molecule can be superimposed on the other.

The models of molecules shown are mirror images of each other.

(B) (C) (D)

(B) (C) (D)

(A) (B) (C) (D)

Here is a model of a molecule of 1-iodoethanol.

(B) (C) (D)

(B) (C) (D)

(A) (B) (C) (D)

Which model of a molecule below is a mirror image of the one above?

(B) (C) (D)

(B) (C) (D)

(A) (B) (C) (D)

ICAS Science Sample Paper J © UNSW Global Pty Limited 4

Forquestions 3 and 4 use the information below.

In forensic science, blood alcohol content is tested at the time of sampling and, if challenged in court, from a stored sample.

A student wanted to know how the tightness of the lid of a screw-topped container affected the loss of alcohol over time. He assumed alcohol behaved the same way in blood and water.

He partially filled three containers with equal quantities of 0.1 g L–1 alcohol solution. He then tightened the lids as follows.

• loose lid - tighten until resistance is experienced then turn lid back 1 mm.

• firm lid - tighten until resistance is just experienced.

• tight lid - tighten until resistance is just experienced then turn a further 1 mm forward. The solutions were then stored in a storage cabinet at 30 °C for a number of weeks.

His results are shown in the graph.

0.12

0.10

0.08

0.06

0.04

0.02

0Week 0 Week 1 Week 3 Week 5 Week 7

Standing time

Alc

ohol

con

cent

ratio

n (g

L–1

)

loosefirmtight

KEY

3. By how many grams per litre has the concentration dropped after three weeks in the container with the tight lid?

(A) 0.005(B) 0.01(C) 0.09(D) 0.095

4. Which hypothesis best applies to this experiment?

(A) Blood reacts with alcohol over time.(B) Blood kept in sealed containers should not be used in court.(C) Changes in blood alcohol concentration are due to lid tightness.(D) Changes in temperature affect blood alcohol concentration.

5 ICAS Science Sample Paper J © UNSW Global Pty Limited

5. When a solvent in a mixture evaporates, any dissolved solids are left behind.

The Soxhlet extractor works very well to extract chlorophyll from leaves using a flammable solvent.

There are seven steps in the process.

1. The leaves are placed in a sieve.

2. The solvent evaporates and passes through the bypass sidearm.

3. The solvent vapour enters the condenser.

4. The condenser liquefies the solvent.

5. The solvent drops into the sieve and dissolves chlorophyll from the leaves.

6. When the liquid fills up to the top of the reflux sidearm, it is all siphoned back in the flask.

7. Solvent and chlorophyll collect in the flask.

The process repeats from step 2 until the apparatus is switched off.

Which of the following statements explains the purpose of this Soxhlet extractor?

(A) Poisonous or flammable solvents can be used safely.(B) The extracting solvent can be heated up to near boiling point.(C) The solvent can be constantly purified before re-use.(D) Chlorophyll can be continuously extracted and concentrated.

END OF PAPER

water out

bypass sidearm

flask

condenser

water in

solvent

reflux sidearmsieve

solvent + chlorophyll

heat source

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C C C C C C C C C C C C C C C C C C C

D D D D D D D D D D D D D D D D D D D

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A A A A A A A A A A A A A A A A A A A A A A A A

B B B B B B B B B B B B B B B B B B B B B B B B

C C C C C C C C C C C C C C C C C C C C C C C C

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H H H H H H H H H H H H H H H H H H H H H H H H

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J J J J J J J J J J J J J J J J J J J J J J J J

K K K K K K K K K K K K K K K K K K K K K K K K

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START

TO ANSWER THE QUESTIONSExample:

Ari added cordial to water to make a jug of drink. What will be the volume of the drink in the jug?

(A) 50 mL (B) 150 mL (C) 200 mL (D) 250 mL

The answer is 250 mL, so you would fill in the oval D , as shown.

DCBA

USE A PENCILDO NOT USE A COLOURED PENCIL OR PEN

1 A B C D

2 A B C D

3 A B C D

4 A B C D

5 A B C D

ICAS Science Sample Paper J © UNSW Global Pty Limited

ICAS Science Practice Questions Paper I © EAA

QUESTION KEY KEY REASONING LEVEL OF DIFFICULTY

1 C If the graphs are plotted on the same set of axes, they will cross at approximately 4 300 million years ago Easy

2 D

A is identical to the original, so A is wrong. B is the same as A but it is has been flipped and rotated, so B is wrong. C is the same as B but has been further rotated, so C is wrong. Models A, B and C are all (1R)-1-iodoethanol. Compare D and the original; the blue atom is in a different position. D is a different chemical, and is called (1S)-1-iodoethanol. These are optical isomers.

Easy

3 A

The tight column in the graph shows that after three weeks the concentration in the tight lidded container dropped from 0.10 gL-1 to approximately 0.095 gL-1 which is a difference of 0.005 gL-1. Please note that the question asks for the difference after three weeks and not seven weeks.

Medium/Hard

4 C In the experiment the tightness of the lid has been altered (loose, firm, and tight) and change in alcohol concentration was measured. Easy

5 C Hard

LEGEND

Level of difficulty refers to the expected level of difficulty for the question.

Easy more than 70% of candidates will choose the correct option.

Medium about 50–70% of candidates will choose the correct option.

Medium/Hard about 30–50% of candidates will choose the correct option.

Hard less than 30% of candidates will choose the correct option.

Because solvent is continuously entering the sieve dissolving any chlorophyllremaining in leaves, the maximum amount of chlorophyll will be extracted from the leaves and concentrated in the flask.

ICAS Science Practice Questions Paper I © EAA

QUESTION KEY KEY REASONING LEVEL OF DIFFICULTY

1 C If the graphs are plotted on the same set of axes, they will cross at approximately 4 300 million years ago Easy

2 D

A is identical to the original, so A is wrong. B is the same as A but it is has been flipped and rotated, so B is wrong. C is the same as B but has been further rotated, so C is wrong. Models A, B and C are all (1R)-1-iodoethanol. Compare D and the original; the blue atom is in a different position. D is a different chemical, and is called (1S)-1-iodoethanol. These are optical isomers.

Easy

3 A

The tight column in the graph shows that after three weeks the concentration in the tight lidded container dropped from 0.10 gL-1 to approximately 0.095 gL-1 which is a difference of 0.005 gL-1. Please note that the question asks for the difference after three weeks and not seven weeks.

Medium/Hard

4 C In the experiment the tightness of the lid has been altered (loose, firm, and tight) and change in alcohol concentration was measured. Easy

5 C Hard

LEGEND

Level of difficulty refers to the expected level of difficulty for the question.

Easy more than 70% of candidates will choose the correct option.

Medium about 50–70% of candidates will choose the correct option.

Medium/Hard about 30–50% of candidates will choose the correct option.

Hard less than 30% of candidates will choose the correct option.

Because solvent is continuously entering the sieve dissolving any chlorophyllremaining in leaves, the maximum amount of chlorophyll will be extracted from the leaves and concentrated in the flask.