Unit 1 I *x.perirnenfol Design 1

For each of the questions, there are four possible choices.Choose the one you consider correct and record your choice.

d 1. The diagram below shows a section of a burette which is

filled with a solution. What is the burette reading?

30

40

n

0 +. The diagram shows a method of collecting a gas.

2. The diagram below shows a section of a 25-ml measuringcylinder which is filled with a liquid. What is the volume ofthe liquid in the cylinder?

l5

gas ------->

water

Which of the following gases cannot be collected by thismethod?

A 0xygen B Hydrogen

C Carbon dioxide D Sulfur dioxide ( )

5. Which of the following apparatus can be used to measure a

volume of 20.0 cm3 of a solution?

I 25 ml pipette ll 50 ml burettelll 25 ml measuring cylinder lV 20 ml beaker

A ll only B I and ll onlyC ll and lll only D ll and lV only (

)

6. A gas, X, is denser than air and insoluble in water.

Which of the following methods cannot be used to collectthe gas?

A X+

X--------->J

x----->

A 34.5 ml

C 45.0 ml

B 35.0 mlD 45.5 ml

B 12mlD 18 ml

d d

d

20

10

5

B

A 7mlC 13 ml

d3. The diagram shows a section of a burette. At which positionshould the eye be placed to obtain an accurate reading of theliquid volume?

C

AB

C

D

bo

X ---------> rll

mentol Design

()

()

()

()

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2 Theme I I ffxperimentcl Chemisir"y

l. The following apparatus was set up to collect a cylinder ofgas Y.

liquid reagent

+

U n The following setup can be used to study reaction rates.

thistlefunnel

watersolid

bottom

The liquid reagent was poured into the round-bottom flask

and reacted with the solid reactant. The gas was collectedin the cylinder over water.

Which of the following statements is true?

A Gas Y is soluble in water.B The cylinder contained pure gas Y.

C Gas Y is not soluble in the liquid reagent.

D Some of gas Y had escaped from the thistle funnel.()

rubber bunggas syringe

conical flask

stopwatch

For which of the following reactions is the rate not best

measured using this setup?

A CuH,,Ou(aQ) - 2C0,(g)+ 2C,H,0H(l)

B tt/g(s) + 2HCl (aq) * 149[7,(aq]+ H,(9)

C CaC0,(s)+ 2HC/(aq) - CaC/z(aq)+ COlg)+ H,0(l)

D Na,S0,(aQ) + 2HCl(aq) - 2NaC4aq) + S0,(g)+ H,0(l)()

10. The following apparatus can be used in the measurement of

liquid volumes:

I 25 ml pipette

ll 25 ml beaker

lll 50 ml burettelV 25 ml graduated measuring cylinder

Which of the following shows the correct order of decreasing

accuracy of these apparatus?

A r,ilr,rvil B il,rvil|,Ic r,ilt,il,rv D ll,l\/,l,lll ( )

1 1. A student weighed a 1.2 g sample of a solid compound and

wanted to prepare a 25.0 ml solution from it. Which of thefollowing apparatus is most suitable?

gas

flask

U t Gas X can be prepared by the following apparatus.

\\,s

wliquid reagent

+

solid reagent

What can you deduce about gas X?

I lt is less dense than air.

ll lt is denser than air.

lll lt is insoluble in water.lV lt is soluble in water.

A I and lll only

C lland lllonly

reagent

B I and lV only

D ll and lV only

50.0 ml 25.0 ml 25.0 ml

C

25.0 ml

DA B

()

()

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12. Aqueous sodium thiosulfate reacts with hydrochloric acidaccording to the following equation:

Na,S,0,(aQ)+ 2HCl(aq) - 2NaC/(aq)+ H,0(l)+ S(s)+ S0lg)

A student attempted to measure the rate of this reaction usingthe given apparatus.

cotton wool

conical flask

hydrochloric acid

marble

top pan balance

Why is the setup not suitable?

A The sulf ur formed gives a cloudy suspension.B The gas formed largely remains in the mixture.C The reactants are all aqueous and do not include a solid.D The mass of the mixture decreases too fast for accurate

measurement. ( )

13. Silica gel is a solid which can absorb water vapour from theair. lt can be used to limit the growth of mould on leathergoods and electronic equipment.

Which of the following methods can be used to study the rateof absorption of water vapour in silica gel?

A

gas syringe

conical flask

silica gel

silica gelweighing scale

rubber buns

Unit 1 lfixperimentol Design 3

gas syringe

silica gel

w14. A student is exploring various ways to measure the rate ofthe following reaction by measuring changes in differentvariables of the reaction:

Cr,0,F(aQ) + 14H-(aq) + 3C,0oL(aQ) - 2Cr't(aq) + 6C0lg) + 7H,0(l)

Which of the following methods of monitoring the rate ofreaction are suitable?

I Volume of gas produced

ll pH of the reaction mixturelll [Vass of the reaction mixturelV Amount of precipitate obtainedV lntensity 0f the orange colour of the reaction mixture

A l, ll and lll only B l, lll and V onlyC l, ll, lll and V only D ll, lll, lV and V only

()

Hefer to the following t0 answer questions 15 and 16.

Ethene can be converted to ethane by the hydrogenation reaction

C,Ho(g)+ H,(g) - C,Hu(g)

This reaction can be carried 0ut in the following apparatus:

catalyst

gas syringe A gas syringe B

An ethane-hydrogen gas mixture of equal proporti0n in gas syringe Awas passed over the heated catalyst. The gaseous product, ethane,was collected in gas syringe B.

The readings on syringe A are as follows:

Gas syringe A Gas syringe B

lnitialreading 70 ml lnitialreading 0ml

Final reading 20 ml

\\,0 15. What is the expected final reading on gas syringe B?

A 25ml B 35mlC 50ml D 100m1 (

D

B

fheat

C

otrtr

EXTENSION QUESTIONS

trtrtrsilica gel

()Dan

yal E

duca

tion

d

4 lhemel I ExperimentolChemisiry

16. Which of the following substances can be used to test if thereaction is complete?

Limewaterueous bromine

ueous silver nitrateueous potassium iodide (

Befer to the following t0 answer questions 17 to 19.

Paraffin is one of the fractions that can be obtained from the cracking

of petroleum. lt consists of a mixture of hydrocarbons of chain length

Croand greater.

ln one experiment, paraffin was heated strongly over some porous

porcelain chips as shown below:

charcoal

porcelain chips

woolsoaked inliquidparafhn

hard-glassboiling tube

watertrough

UrO. rn.diagramshowsapparatususedbyastudenttopreparecarbonmonoxidefromcharcoal

17. What is the purpose of the porcelain chips?

A To dry the gaseous hydrocarbons

B To act as a catalyst for the reactionC To react with paraffin to break it downD To prevent water from being suck-backed into the hot

boiling tube ( )

18. What process is demonstrated in this experiment?

A Combustion B DecompositionC Polymerisation D Fractionaldistillation

()

19. Some oil was observed t0 be floating on the surface 0f thewater in the trough.

Suppose, in a similar experiment, there was enough paraffin toyield a layer of oil on the water surface, which of the followingcan be used to separate this oil from the mixture?

A Filtration B DistillationC Chromatography D Separating funnel ( )

carbonmonoxide

gas jar

water

\\,0

d

AD

n

D

AqAqAq

d

theat

dilutehydrochloricacid

x

calciumcarbonate

What change is needed to give a purer yield of carbon monoxide?

A Use sulfuric acid instead of hydrochloric acid to prevent hydrogen chloride formation

B Pass gas stream from X into a flask contarning a drying agent before collection

C Pass gas stream from X through a filtering device to remove soot produced from the charcoal

D Pass gas stream from X into a flask containing aqueous sodium hydroxide before collection

1

heat

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Unit I l[xperlmentol Design 5

steel woolwashed invinegar solution

21. Ihe Gobar Gas Research Station in lndia conducts researchinto converting cow manure into methane gas which canthen be used as a fuel. Cow manure gas is 55-65% methane,

30-35% carbon dioxide, with some hydrogen, nitrogen and

other trace gases.

ln which order should the pieces of apparatus shown below bejoined together to collect a dry and purer sample of methanefrom the cow manure gas mixture?

Icow manure _____>.gas sample

drying agent

2

limewater

The following apparatus was used to determine the formulaof an oxide of lead.

excess gasbuming

hydrogen -------->gas

asbestos plate

Hydrogen gas was first passed over the lead oxide beforeheating. When the lead oxide was heated to a hightemperature, it gradually turned into shiny beads of molten

lead. Heating was stopped, but hydrogen was allowed to pass

over the lead until it was cold.

The results were as follows:

Weight of tube and its contents at the start = 16.73 S

Weight of tube and its contents at the end = 16.69 g

lf the f low 0f the hydrogen was stopped at the same time thatthe heating was stopped, what would have been the weightof the tube and its contents at the end?

A 16.69 g

B lVore than 16.69 g

C Less than 1 6.69 g

D 1673s ( )

23. The percentage composition of oxygen in the air was verifiedusing the following apparatus.

lead

theat

-)

4 a graduated tubecontaining 100 cmlof air

water

water

The steel wool will react with oxygen t0 form rust. The initialvolume of air in the tube was 100 cm3 and at the end of theexperiment, the volume of air that remained was g0 cm3.

Which of the following factors could have accounted for thisobservation?

A Too much steel wool was used.

B The iron oxide decomposed to give oxygen.C The mass of steel wool used was insufficient.D All the oxygen had reacted with the steel wool. ( )

)21,3

A1,C2,

B 1,2,4D 2,1,4 )

(

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6 Theme I I Experimentol Chemistry

Befer to the following to answer questions 24 and25.

Drying agents are chemicals used to remove water or water vapour from a substance. Examples of drying agents commonly used in the lab arephosphorus(V) oxide, calcium oxide, sodium hydroxide and concentrated sulfuric acid.

The diagrams below show several methods of drying a sample of gas produced from a reaction.

gas+gas ---+

calciumoxide

phosphorus(V)

concentratedsulfuric acid

oxide

I II III

gas +gas ---->

sodium hydroxideaqueoussodium hydroxide

IV

W,o Which of the methods cannot be used for collecting a drysample of ammonia that is produced from a reaction?

A lV only

B I and lll only

C I and lV only

D l, lll and lV only ( )

w25. Which of the methods cannot be used for collectlng a dry

sample of sulfur dioxide that is produced from a reaction?

A lV only

B I and lll only

C I and lV only

D ll, lV and V only ( )

tgas

Hefer to the following to answer questions 26 and27.

The diagram below shows an experiment to investigate the production of nitrogen f rom ammonia.

oxide

ammonia gasnitrogen

combustion tube

water

cold water

condensed water

Setup X

Ammonia gas was passed 6ver very hot coppe(ll) oxide. When the reaction was complete, copper was obtained in the combustion tube and

nitrogen collected as shown.

theat

l-------------a

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Unit I lfixperimentol Design 7

W,u

d

What is the main purpose of the setup labelled X?

A To dry the nitrogen gas

B To condense and remove ammonia from the gas

C To condense the water vapour obtained from the reaction

D To prevent water from being sucked back into the hotmetal oxide ( )

27. ln the reaction, what happened to ammonia?

A lt was oxidised.

B lt was reduced.

C lt was dehydrated.

D lt was decomposed. ()

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