8/19/2019 8D UT3 BIO CHEM Project 2012 Que

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IGCSE UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS MethodistHigh School

CLASS VIII D UNIT TEST 3 PRACTICAL CHEMISTRY [1!"I#L#GY [1! 

Q. 1 An experiment was carried out to investigate the effect of light intensity on the rate of 

 photosynthesis of a water plant. The diagram below shows the apparatus used.

(a) Suggest how you ensure that the plant had a good supply of carbon dioxide !1"

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(b)(i) #hich gas is given off by the plant !1"

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(ii) $ow could you test for this gas !1"

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(c) $ow could you prevent the heat from the lamp affecting the experiment !1"................................................................................................................................................................

(d) $ow would you use this apparatus to investigate the effect of increasing light intensity !1"

on the rate of photosynthesis

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 (e) The diagram shows some of the processes which ta%e place in a green plant.

(i) &ame A' and . !*"

A................................................. ........................................... ............................................

(ii) #hat is the function of the chlorophyll !1"

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(iii) +n what form do plants such as potatoes store sugar !1"

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Q. ,(a) $annah mixes sand and water together. The mixture can be separated using the e-uipment below.

8/19/2019 8D UT3 BIO CHEM Project 2012 Que

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IGCSE UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS MethodistHigh School

CLASS VIII D UNIT TEST 3 PRACTICAL CHEMISTRY [1!"I#L#GY [1! 

(i) #hat name is given to this method of separating !1"

(ii) /xplain why sand can be separated from water using this method. !1"

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(iii) $annah wants to separate some different mixtures.

omplete the table below to show how $annah could separate each mixture -uic%ly. !0"

(b) inda had a piece of red sandstone. She hammered it

into pieces and then ground them into a powder using a

 pestle and mortar.

She put the powder into a measuring cylinder withwater and shoo% the mixture. The contents settled.

 

8/19/2019 8D UT3 BIO CHEM Project 2012 Que

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IGCSE UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS MethodistHigh School

CLASS VIII D UNIT TEST 3 PRACTICAL CHEMISTRY [1!"I#L#GY [1! 

(i) inda said her results showed that sandstone is a mixture of two substances. $ow could she tell'

from the results' that sandstone is a mixture of substances !1"

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(ii) inda then poured the cloudy water from the measuring cylinder through filter paper in a filter 

funnel.

She said there might be salts dissolved in the colourless' clear li-uid that came through the filter.

#hat could inda do to find out if there were salts dissolved in the colourless' clear li-uid !1"

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(iii) #hat would she see if there had been salts dissolved in the colourless' clear li-uid !1"

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(iv) Sandstone is a sedimentary roc%. 2our stages in the formation of sedimentary roc% are !1"listed below. They are not in the correct order. !compacted deposited weathered transported"

3ut these stages in the correct order. 4ne has been done for you.