smkcl chemistry monthly test 1 f5 2009

8/11/2019 SMKCL Chemistry Monthly Test 1 F5 2009

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SEKOLAH MENENGAH KEBANGSAAN CHANGKAT LADA

CHEMISTRY MONTHLY TEST 2009

FORM 5

Name : .. Form :

1. The rate of a chemical reaction cannot be determined by measuringA the volume of gas liberated per unit timeB the formation of precipitate per unit timeC the change of colour per unit timeD the change of size of solid per unit time

2. Which of the folloing reaction is the sloest!A "usting of ironB #recipitationC NeutralisationD $ombustion

%. & student ants to study the relationship beteen the concentration of hydrochloric acid and time ofreaction by reacting the acid ith magnesium ribbon. What should be the responding variable!A $oncentration of acidB Time ta'en for reactionC &mount of magnesium ribbonD (ength of magnesium ribbon

). &luminium poder reacts faster ith hydrochloric acid than an aluminium strip becauseA the particles in the aluminium strip are pac'ed closelyB the particles of aluminium poder have more 'inetic energyC the aluminium poder has a larger total surface areaD there is a layer of aluminium o*ide on the aluminium

+. The table shos the total volume of gas collected at regular intervals in a reaction. What is the averagerate of reaction in this e*periment !

A ,.,)1 cm% -sB ,.,) cm% -sC ,.,)/ cm% -sD

,.,+% cm

%

-s

0. The graph shos the volume of carbon dio*ide gas produced against time for the reaction of calcium

carbonate and sulphuric acid.

Time (s) , %, 0, /, 12, 1+, 1, 21,

Volume of gas (cm3 ) , 2., %. +.2 0.) .% .0 .0

Volume ofCO

2gas / cm3

Time / second


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The gradient of the graph decreases ith time becauseA catalyst is not usedB volume of mi*ture decreasesC temperature of reaction decreasesD concentration of sulphuric acid decreases

. iagram ) shos the graph of volume of carbon dio*ide gas against time hen + g of marble chips is

added to +, cm%of ,.2 mol dm3%hydrochloric acid

&t hat time the rate of reaction the highest!At1

B t2C t%D t)

. Which of the folloing statements is correct about the rate of reaction!A The rate of reaction decreases ith timeB The rate of reaction depends on the total volume of the reactantsC The rate of reaction is constant if the reaction is carried out at very high temperatureD The rate of reaction doubles hen the temperature is doubled

/.

& group of students carried out an e*periment to determine the rate of reaction of zinc metal ith dilutehydrochloric acid. The diagram above shos the graph for the total volume of gas collected against time.

The average rate of reaction for the hole e*periment is :A ,.% cm%-sB ,.2+ cm%-sC ,.1 cm%-sD ,.1% cm%-s

1,. 4ydrogen gas is liberated hen magnesium reacts ith sulphuric acid. Which of the folloing pairs of

reactants ill give the fastest initial rate of reaction!A ,.1 mol dm3% of sulphuric acid and magnesium ribbonB ,.1 mol dm3% of sulphuric acid and magnesium poderC ,.2 mol dm3% of sulphuric acid and magnesium ribbonD ,.2 mol dm3% of sulphuric acid and magnesium poder

0 60 120 180 240 300 time / s

Volume of H2gas / cm3

4

0363

02

01

81

0


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11. When + g of zinc metal reacts ith an e*cess of hydrochloric acid5 the rate of reaction is faster using fine

zinc poder instead of using granulated zinc. Which of the folloing statements e*plain hy this occurs!A The fine zinc poder is more reactive than granulated zincB The activation energy level is loered hen the fine zinc poder is usedC The fine zinc poder has a greater surface area in contact ith hydrochloric acidD The particles in the fine zinc poder collide faster than that in the granulated zinc

12. iagram belo shos curve W obtained from the decomposition of 2, cm%

of ,.), mol dm3%

hydrogenpero*ide solution5 42625 using ,.2 g of manganese 789 o*ide as catalyst at a temperature of %,

,$.

Which of the folloing e*periments illproduce curve ;!

1%. The diagram shos the apparatus set3up used to study the rate of reaction of calcium carbonate and

hydrochloric acid.

The rate of the

above reaction can

be increased byA grinding the marble chipsB loering the temperature of hydrochloric acid

C using a larger flas'D adding ater to hydrochloric acid1). $atalysts speed up chemical reactions. Which industry uses enzymes as a catalyst!

A #roduction of ammonia from hydrogen and nitrogenB #roduction of sulphuric acid from sulphurC #roduction of ethanol from sugarD #roduction of ethane from al'ene

1+. & catalyst is use in manufacturing industries because it canA increase the


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D increase the ive a tic' 7 for the correct anser in the folloing table.

(4 marks)

%. 1. g of magnesium ribbon is added to e*cess dilute hydrochloric acid in a bea'er. The reaction stops

after ,.+ minutes. 12.,cm% of hydrogen gas is collected.a $alculate the average rate of reaction5 in g s31

(1 mark)b $alculate the average rate of reaction5 in cm% s31

(1 mark)

). ?tate five factors hich affect the rate of reaction.

i. ii .

iii iv.

v.(5 marks)

+. Name to variables hich are constant in e*periment to study:

!ast "eaction Slo# "eaction

$easu"a%le &isi%le c'anges Tic

The change in mass at regular time intervals

Formation of precipitate

$olour changes

The volume of gas liberated at regular time intervals


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a the effect of concentration on the rate of reaction.

i... ii..(2 marks)

b the effect of catalyst on rate of reaction.

i... ii..

(2 marks)

c the temperature on the rate of reaction.

i... ii..(2 marks)

0. The folloing table shos the volume of gas collected from e*periment

$alculate the average rate of reaction fora the first 0, seconds

(1 mark)b the overall reaction

(1 mark)

Time (s) , %, 0, 12, 1+,

Volume of gas (cm3) , 1 2/ %0 %0

smkcl chemistry monthly test 1 f5 2009

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