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DC (SJF/CGW) 89405/3 © UCLES 2014 [Turn over

Cambridge International ExaminationsCambridge International General Certificate of Secondary Education

*2 6 6

6 9 8

8 3

5 6*

COMBINED SCIENCE 0653/33Paper 3 (Extended) October/November 2014

1 hour 15 minutes

Candidates answer on the Question Paper.No Additional Materials are required.

READ THESE INSTRUCTIONS FIRST

Write your Centre number, candidate number and name on all the work you hand in.Write in dark blue or black pen.You may use a pencil for any diagrams or graphs.Do not use staples, paper clips, glue or correction fluid.DO NOT WRITE IN ANY BARCODES.

Answer all questions.

Electronic calculators may be used.You may lose marks if you do not show your working or if you do not use appropriate units.A copy of the Periodic Table is printed on page 24.

At the end of the examination, fasten all your work securely together.The number of marks is given in brackets [ ] at the end of each question or part question.

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1 (a) A student performs some experiments to find out what makes iron rust.

(i) Fig. 1.1 shows his first experiment.

100

80

60

40

water

air

cotton wool

iron filings

20

Fig. 1.1

Fig. 1.2 shows the apparatus after one week. The iron has rusted and the water has risenup the cylinder.

80

60

40

water

air

cotton wool

iron filings

20

100

Fig. 1.2

Explain why the water has risen up the cylinder.

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

.......................................................................................................................................[1]

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(ii) The student repeats the experiment using helium in the cylinder instead of air.

Fig. 1.3 shows the results after one week.

100

80

60

40

water

helium

cotton wool

iron filings

20

Fig. 1.3

The iron has not rusted and the water has not risen up the cylinder.

Explain why the water has not risen up the cylinder.

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

.......................................................................................................................................[1]

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(b) The student writes in his notebook:

“When sodium burns in ch lorine it forms ions that are like neon atoms .”

(i) State two similarities in the arrangement of electrons in a sodium ion and a neon atom .

The Periodic Table on page 24 may help you to answer this question.

1 ........................................................................................................................................

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

2 ........................................................................................................................................

.......................................................................................................................................[2]

(ii) Complete the diagram of the electronic structure of a sodium atom.

Na

[1]

(iii) Describe what happens when a sodium atom becomes a sodium ion .

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

.......................................................................................................................................[1]

(iv) Some sodium chloride is dropped into a container filled with chlorine.

Predict whether or not the sodium ions in sodium chloride would react with chlorineatoms .

Explain your answer.

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

.......................................................................................................................................[1]

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(c) Name a noble gas.

State and explain a use for this noble gas.

name .........................................................................................................................................

use ............................................................................................................................................

explanation ...............................................................................................................................

...............................................................................................................................................[2]

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(b) The man’s energy is transferred to the canoe as it gains speed.

The kinetic energy gained by the canoe is less than the energy transferred from the man.

The principle of energy conservation applies to these energy transfers.

State what happens to the man’s energy that is not transferred into kinetic energy of thecanoe.

...............................................................................................................................................[1]

(c) The man paddles the canoe at a steady speed of 2 m / s.

The canoe and man together have a mass of 250 kg.

Calculate the kinetic energy of the canoe.

State the formula you use and show your working.

formula

working

kinetic energy = ................................ ....................... J [2]

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3 (a) Fig. 3.1 shows a diagram of the uterus in a pregnant female.

Y

Fig. 3.1

(i) Using label lines, label the placenta and cervix on Fig. 3.1. [2]

(ii) Complete the sentences using words or phrases from the list.

You may use each word or phrase once, more than once or not at all.

bacteria carbon dioxide cells glucose viruses

The placenta allows dissolved nutrients such as ....................................... to pass through

to the baby. Other small molecules such as ....................................... are also able topass through the placenta. [2]

(iii) Name the liquid found at position Y and state its function.

name .................................................................................................................................

function ..............................................................................................................................

.......................................................................................................................................[2]

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(b) Some of the nutrients that pass through the placenta result from the chemical digestion oflarge food molecules in the digestive system of the mother.

(i) Complete Table 3.1 with ticks ( ✓ ) and crosses ( ✗) to predict whether the digestingenzymes amylase (starch-digesting enzyme) and protease (protein-digesting enzyme)are active in the parts of the digestive system shown.

Table 3.1

type of enzyme in the small intestine in the large intestinekey✓ = enzyme active✗ = enzyme inactive

amylase

protease

[2]

(ii) Explain your answers to part (b)(i) ............................................................................................................................................

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

.......................................................................................................................................[2]

(c) The human immunodeficiency virus (HIV) can be transmitted through sexual intercourse.

Describe how HIV affects the immune system.

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

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

...............................................................................................................................................[2]

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4 Fig. 4.1 shows an electric hairdryer that uses mains electricity.

Fig. 4.1

A heater inside the hairdryer warms the air. A fan blows the warm air out of the hairdryer.

(a) The hairdryer contains a switch, a heater to warm the air and an electric motor to drive thefan. The heater and the motor are connected in parallel.

Fig. 4.2 shows the circuit symbols for a heater and an electric motor.

M

electric motorelectric heater

Fig. 4.2

Complete the circuit diagram for the hairdryer. The circuit has been started for you.

mains electricity supply

[2]

(b) The flow of warm air dries the wet hair by evaporation.

Describe in terms of molecules how the flow of warm air speeds up the drying of wet hair.

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

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

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

...............................................................................................................................................[3]

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(c) If the heated air was not blown out sideways by a fan, it would simply move upwards.

Explain why heated air rises.

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

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

...............................................................................................................................................[2]

(d) Fig. 4.3 shows information on a label fixed to the hairdryer.

220 V

1100 W

Fig. 4.3

(i) State the name of the unit whose symbol is W.

.......................................................................................................................................[1]

(ii) Use the formula P = I V to show that the current in the hairdryer when in use is 5 A.

Show your working.

[1]

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(e) The plug on the lead of the hairdryer is fitted with a fuse. One day, the fuse blows while thehairdryer is being used.

(i) Give one possible cause for the fuse blowing.

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

.......................................................................................................................................[1]

(ii) The fuse has to be replaced.

The current through the hairdryer when in use is 5 A. Several new fuses with differentcurrent ratings are available.

2 A 5 A 10 A 15 A

Explain which of these four fuses should be used.

Fuse ..................... because ............................... ................................... .........................

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

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

.......................................................................................................................................[2]

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5 (a) A student investigates the effect of gravity on the growth of a seedling.

The student germinates a seed. When the radicle is clearly visible, he pins the seedling toa board, as shown in Fig. 5.1 (a). He positions the board on its side so that the radical ishorizontal.

The radicle continues to grow and curves downwards, as shown in Fig. 5.1 (b).

radicle

pin

board board

Fig. 5.1 (a) Fig. 5.1 (b)

(i) Name the growth response shown by the seedling.

.......................................................................................................................................[1]

(ii) Explain why this growth response is an advantage to the seedling.

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

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

.......................................................................................................................................[2]

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(b) Fig. 5.2 shows a diagram of a radicle similar to the one in Fig. 5.1 (a). The shaded area showsthe location of hormones that cause the response in (a)(i) .

radicle

Fig. 5.2

Describe fully how the hormones act to cause the response shown by the radicle.

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

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

...............................................................................................................................................[2]

(c) Roots usually get their energy from aerobic respiration.

The soil around a seedling becomes waterlogged so there are no air spaces.

(i) Suggest how this affects the rate of aerobic respiration.

Explain your answer.

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

.......................................................................................................................................[1]

(ii) Predict and explain the effect this will have on the rate of growth of the seedling.

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

.......................................................................................................................................[1]

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Question 6 begins on page 16

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6 Dilute hydrochloric acid reacts with calcium carbonate to produce carbon dioxide gas.

(a) Complete the word equation for the reaction.

hydrochloricacid + calcium

carbonate ................................ + carbondioxide + ...............................

[2]

(b) Fig. 6.1 shows the apparatus a student uses to investigate the effect of changing the initialtemperature of the acid on the rate of reaction.

dilute hydrochloric acid

balance

calciumcarbonate

g

Fig. 6.1

The student adds the calcium carbonate to excess acid at a temperature of 20 °C.

She records the reading of the balance every minute for 7 minutes.

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Fig. 6.2 shows the results obtained in the first experiment.

200

202

204

balancereading / g

0 1 2 3 4

time / min

5 6 7

206

208

210

Fig. 6.2 (i) Explain why the mass of the apparatus decreases during the experiment.

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

.......................................................................................................................................[1]

(ii) Describe and explain how the rate of reaction changes during the experiment.

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

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

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

.......................................................................................................................................[3]

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(c) The experiment is repeated with the same mass of calcium carbonate and excess acid at atemperature of 30 °C.

(i) Use the information from Fig. 6.2 to predict the final mass of the apparatus when theacid has an initial temperature of 30 °C.

.......................................................................................................................................[1]

(ii) The student finds that the rate of reaction increases as the temperature of the acidincreases.

Use the idea of particle collision to explain the effect of temperature on the rate ofreaction.

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

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

.......................................................................................................................................[2]

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7 Astronomers use telescopes to study the electromagnetic radiation that reaches the Earth fromthe stars.

(a) (i) Complete the sentences below using words or phrases from the list. You may use eachterm once, more than once or not at all.

radio waves sound waves ultra-violet visible light water waves

People can see stars with their eyes because the stars emit ................................ ......... .

Astronomers need special telescopes to see other types of electromagnetic radiation

from stars. Examples of such types of radiation are ......................................... and

................................... ...... . [2]

(ii) We are able to see the Moon, even though the Moon itself does not emit electromagneticradiation.

State a characteristic behaviour of electromagnetic radiation that enables us to see theMoon.

.......................................................................................................................................[1]

(b) Some stars emit electromagnetic radiation with a very high frequency, such as X-rays.

(i) Fig. 7.1 shows an incomplete diagram of the electromagnetic spectrum.

gammaradiation microwaves

Fig. 7.1

Mark with an X on Fig. 7.1 the part of the spectrum where X-rays are situated. [1]

(ii) A binary consists of two stars close together. In one particular binary, one star emitsmainly light, while the other emits mainly X-rays.

The light and X-rays leave this binary at the same time.

Tick the box next to the correct statement in the list below and give a reason for youranswer.

X-rays will reach the Earth first.

Light will reach the Earth first.

X-rays and light will reach the Earth at the same time.

reason ...............................................................................................................................

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

.......................................................................................................................................[2]

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8 (a) Fig. 8.1 shows an experiment to investigate the effect of changing light intensity on the rate ofphotosynthesis of a water plant called Elodea .

lamp

metre rule

water

Elodea

Fig. 8.1

The light intensity is altered by changing the distance between the lamp and the plant.

The number of bubbles of oxygen produced by the plant per minute is used to find the rate ofphotosynthesis.

The results are shown in Fig. 8.2.

20

0

40

average number ofbubbles of oxygen

produced bythe plant per

minute

0 10 20 30 40

distance from lamp to plant / cm

50

60

80

Fig. 8.2

Use Fig. 8.2 to describe how the rate of photosynthesis of the plant changes as the lightintensity is varied.

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

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

...............................................................................................................................................[2]

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(b) Fig. 8.3 shows some of the living organisms in a pond.

plant P

plant Q

Fig. 8.3

Suggest how the rate of photosynthesis of plant P compares with plant Q. Explain youranswer.

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

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

...............................................................................................................................................[2]

(c) The pollution of water by fertilisers can cause eutrophication .

(i) Some fertiliser is added to a pond. Describe the effect this will have on the plants that liveon the surface of the pond.

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

.......................................................................................................................................[1]

(ii) Use your answer to (b)(i) to predict how eutrophication will affect plant Q in Fig. 8.3.

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

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

.......................................................................................................................................[2]

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9 Aluminium is extracted from an ore called bauxite.

Bauxite is a mixture of aluminium oxide and other compounds.

The element aluminium is extracted from molten aluminium oxide by electrolysis.

The element oxygen is also formed during the electrolysis.

(a) Using examples taken from the sentences above, explain

(i) one difference between an element and a compound,

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

.......................................................................................................................................[1]

(ii) one difference between a compound and a mixture.

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

.......................................................................................................................................[1]

(b) Aluminium oxide consists of A l 3+ ions and O 2– ions.

Deduce the formula of aluminium oxide. Explain your answer.

...............................................................................................................................................[2]

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(c) In industry aluminium is extracted from aluminium oxide by electrolysis.

Fig. 9.1 shows the apparatus used.

molten mixturecontainingaluminium oxide

molten aluminium

carbon cathodelining the electrolysis cell

carbon anode+–

Fig. 9.1

Explain, in terms of the ions present, how aluminium is formed at one of the electrodes.

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

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

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

...............................................................................................................................................[3]

(d) Copper can be extracted from an ore containing copper oxide by heating it with carbon.

Explain why aluminium cannot be obtained from aluminium oxide in the same way.

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

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

...............................................................................................................................................[2]

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Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local

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