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FORM TP 2016005 JANUARY 20I6

CARIBBEAN EXAMINATIONS COUNCIL

CARIBBEAN SECONDARY EDUCATION CERTIFICATE@EXAMINATION

CHEMISTRY

Paper 02 - General Proficiency

2 hours and 30 minutes

READ THE FOLLOWING INSTRUCTIONS CAREFULLY.

I . This paper consists of SIX questions in TWO sections.

2. Answer ALL questions.

3. Write your answers in the spaces provided in this booklet.

4. Do NOT write in the margins.

5. Where appropriate, ALL WORKING MUST BE SHOWN in this booklet.

6. You may use a silent, non-programmable calculator to answer questions.

7. If you need to rewrite any answer and there is not enough space to do so on theoriginal page, you must use the extra lined page(s) provided at the back of thisbooklet. Remember to draw a line through your original answer.

8. If you use the extra page(s) you MUST write the question number clearly inthe box provided at the top of the extra page(s) and, where relevant, includethe question part beside the answer.

DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO.

Copyright O 2014 Caribbean Examinations CouncilAll rights reserved.

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(i)l. (a)

-4-

SECTION A

Answer ALL questions in this section.

Write your responses in the spaces provided in this booklet.

DO NOT spend more than 30 minutes on Question l.

Define the term 'rate of reaction'.

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(ii) State TWO factors, other than concentration, whichreaction.

(1 mark)

affect the rate of a chemical

(2 marks)

Carol carried out a number of experiments to investigate the effect of concentration on

the rate of reaction. Different concentrations of aqueous potassium iodate (KIOr) were

allowed to react with a fixed concentration of aqueous sodium hydrogen sulfite (NaHSOr)in the presence of sulfuric acid and starch as indicated in Table I (page 6). The time takenfor a blue-black colour to appear was noted.

The equations for the reactions that occurred during the experiments are shown below.

NaHSO, + H2SO' - H,SO, +NaHSOo

KIO, + 3H2SO3 --- Kl + 3H2SO4

KlO, + 3H2SO4 + 5Kl - 3K"SOr + 3H2O+ 312

I, + starch ---+ starch-!, complex (blue-black)

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(b)

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Materials:

The six experiments were done using measured volumes of the following solutions asshown in Table I on page 6:

Solution l: 100 cm3 of aqueous solution containing 0.214 gof potassium iodate (KIOJ.

Solution 2: 100 cm3 of a mixture of aqueous sodium hydrogen sulfite (NaHSOr), sulfuricacid, and starch solution.

Solution X: 50 cm3 of aqueous potassium iodate (KIOJ of an unknown concentration.

In Experiment 6, Solution I was replaced with Solution X.

The solutions were mixed in a container and the time taken for a blue-black colour toappear was recorded. The results ofthese experiments are summarized in Table I (page 6).

(i) Calculate the concentration, in mol dm-3, of KIO, in Solution 1.

[RAM: K:39.1, l:126.9, O: 16.0]

(3 marks)

The final concentration ofNaHSO, in all experiments was 0.0008 moldm-3. Usingthe information provided in Table I on page 6, determine the concentration ofNaHSO, in Solution 2.

(2 marks)

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(ii)

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(c)

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TABLE I: RESULTS AND RECIPROCAL TIMES OF EXPERIMENTS I-6

(i) From the stopwatches displayed in Figure l on page 7, record the times taken

for the blue-black colour to appear in the appropriate spaces in Table l. The timetaken for Experiment I has already been recorded for you. (3 marks)

(ii) Calculate the reciprocaltimes (l/time) and record them to 3 decimal places in theappropriate spaces in Table l. One of the times has already been recorded foryou. (3 marks)

(iii) Using the axes provided on page 8, plot a graph of concentration of KIO, versus

reciprocal time for Experiments l-5, and draw the best straight line through thepoints. (5 marks)

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Experiment Solution I(cmt)

Solution 2(cmt)

DistilledWater(cm')

Time Takenfor Blue-Black

Colour toAppear

(s)

ReciprocalTime(s-')

Concentrationof KIO, after

Mixing(mol dm-3)

I 5 t0 35 83.5 0.0r2 0.0010

2 l0 l0 30 0.0020

J t5 r0 25 0.0030

4 20 l0 20 0.0040

5 25 t0 l5 0.0050

6 20Solution X

t0 20

0121202006


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Figure I shows the stopwatch readings of the times taken for the blue-black colour to appear inExperiments 2{.

Figure 1. Time taken for blue-black colour to appear

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Experiment 4

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Axes for Question f (c) (iii)

0.006

0.002

0.00r

0.03 0.04

Reciprocal time (s't)

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(d) Based on the graph drawn in (c) (iii) on page 8, what deduction can be made about theeffect of concentration of aqueous KIO. on the rate of reaction?

(2 marks)

(e) Experiment 6 was carried out using Solution X, which contained an unknown concentrationof KIOr. Using the reciprocal time calculated in Experiment 6, determine from your graph,the concentration of KIO. in this reaction mixture.

(2 marks)

(i) State the responding variable.(f)

(l mark)

(ii) State the controlled variable.

(l mark)

Total25 marks

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2. One of the main active ingredients in chlorine bleach is the oxidizing agent, sodium hypochlorite(NaClO). By adding it to water, the hypochlorous acid (HOCI) is formed according to the equationbelow.

NaCIO + H,O

Hypochlorite and chlorine are

dependent and low pH (acidic)

cl2+ H.o +

+ HOCI + NaOH

in equilibrium infavours chlorine.

H*+Cl-+HCIO

Equation I

water; the position of the equilibrium is pH

Equation 2

(a) State ONE use of bleach in the laundering of clothing.

(1 mark)

(b) Define, in terms of oxidation state, the terms'oxidizing agent'and'oxidation'

(i) Oxidizing agent

(ii) Oxidation

(1 mark)

(l mark)

(c) Deduce the oxidation number of Cl in the formula. NaClO.

(3 marks)

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(d)

- ll -

In Equation 2 on page 10, chlorine gas, Cl, has become a chloride ion, Cl-.

(i) What is the change in oxidation number of Cl for the process?

(i i) Is this an oxidation or reduction process?

(2 marks)

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(l mark)

( iii) Describe a simple laboratory test for chlorine gas.

(2 marks)

(e) A more natural alternative to chlorine bleach is the use of detergents which release hydrogenperoxide in water. The bleaching action of hydrogen peroxide is also a redox reaction andis represented by the following equation:

zHrOr(ag) - 2HrO(D+ Or(g)

During one stage of the reaction, HrOr(ag) is converted to HrO(/). Use the changes inoxidation number to determine whethei this is an oxidation or'reduction process.

(4 marks)

Total 15 marks

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3.

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Two organic molecules, Compound D and Compound E, are shown below

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H

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H

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Compound E

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(a) Compound D inhibits the growth of mould and bacteria and is used as a preservative in

the food industry.

(i) State the name of ComPound D.

(l mark)

ldentify the homotogous series to which Compound D belongs'

(1 mark)

State ONE chemical property of Compound D'

(1 mark)

Compound E is present in alarm pheromones that are produced by honey bees'

(i) State the name of ComPound E'

iilil,(ii)Identifythehomo|ogousseriestowhichCompoundEbelongs.

(1 mark)

Write the general formula for this homologous series'

(1 mark)

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(i i)

(iii)

(b)

(iii)

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Compound F and Compound G shown below are hydrocarbons.

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I

C:

HHHCompound F Compound G

(i) state oNE physical property that is common to both compounds F and G.

(iii)

(l mark)

(ii) state which compound, F or G, wilr react with bromine in the dark.

(l mark)

Draw the FULLY displayed structure of the product that is formed from the reactionin (c) (ii).

Fully displayed structure(2 marks)

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(v)

-14-

(iv) Will Compound F burn in air with a clear blue flame?

(1 mark)

Write a balanced chemical equation for the reaction that occurs when Compound

F burns in air.

i;;;;*;(vi) state Two properties of hydrocarbons that make them good fuels.

(2 marks)

Total 15 marks

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NOTHING HAS BEEN OMITTED.

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SECTION B

AnswerALL questions in this section.

Write your responses in the spaces provided in this booklet.

Dilute sulfuric acid is the electrolyte used in car batteries. Remi obtained a sample of thiselectrolyte from a car battery and carried out an investigation on it using electrolysis in

the laboratory.

(i) Define the term 'anion'

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4. (a)

(l mark)

(ii) What anions will be present in a sample of this electrolyte?

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'--._-t.'-'-jji:=

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r:l:F

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(1 mark)

(4 marks)

(iii) Draw a clearly labelled line diagram to represent an electrolytic cell.

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During the electrolysis of the acidified water, hydrogenequation for formation of hydrogen is:

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(b)

-lis produced at the cathode. The

Hr(g)

: STB if a current of 965 A is passed500 C mol-r. At STB I mol of gas

Calculate the volume ,

through the circuit foroccupies 22.4 L)

2H.(aq) + 2e- +

of hydrogen gas liberated atlhour. (Q:lxt, F:96

:;-'i*'

---.-....--..:'jiF+:iiif+i-:s:----.{r-'.'-T---\---.

.

rrllli'.'.j::lLi':

(c)

(5 marks)

Remi also wants to purify an impure nickel sample by electrolysis. Suggest how he couldmodify the line diagram drawn in (a) (iii) on page 16 in order to achieve this, and stateONE observation that would be expected.

(4 marks)

Total 15 marks


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5. (a)

(c)

- l8 -

State ONE natural source of hydrocarbons.

(l mark)

Plastics are common materials in today's world and are made from the naptha fraction

obtained from the fractional distillation of petroleum.

List TWO other fractions that can be obtained and state ONE use of EACH fraction.

Fraction:

Use: ..........

(b)

(4 marks)

can be subjected to breakdown throughHeavy oil fractions with a high carbon contenteither catalytic or thermal cracking.

(i) Define the term 'cracking'.

(1 mark)

(ii) How does catalytic cracking differ from thermal cracking?

(2 marks)

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(d)

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There are two unlabelled flasks on a laboratory shelf each containing a different, colourlessorganic liquid. lt is believed that one flask contains pentane, and the other butanoic acid.To determine their identities, dilute sodium hydroxide is added to each flask.

(i) Write an equation, using FULLY displayed structures, which summarizes theexpected reactions in EACH case. ldentify any products formed.

(5 marks)

Write a balanced chemical equation for the complete combustion of pentane.

(2 marks)

Total 15 marks

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-20- -l

Dry ammonia gas can be produced in a school laboratory.

(a) Identify TWO reagents that are necessary for the laboratory production of ammonia.

(l mark)

Two common drying agents used in the laboratory are calcium oxide and concentratedsulfuric acid. However, calcium oxide is the preferred choice for drying ammonia gas.

Explain why concentrated sulfuric acid is not used. Include in your answer a balancedchemical equation.

(b) mi!:ni:fri;-j,-Qi.irrEjji$;:,t*.ill:-:==i...-]

.l=i:ri1']i:n:s-j'-':'.xf

:Ei-If.-j

-!++1.lsin:+.ii::

:Ei-f*r-::tiai::ti--'.

(3 marks)

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(c) When gases are prepared in the laboratory, there are three main ways in which they canbe collected:

Upward deliveryDownward deliveryDisplacement of water

(i) What TWO factors should be considered when choosing an appropriate methodfor the collection of gases in the laboratory?

(2 marks)

Identify ONE of the three methods that is best suited for the collection of ammoniagas in the laboratory. Explain why EACH of the other two methods would NOThave been appropriate.

(5 marks)

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(ii)

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(d)

_22 _

Hence, draw a labelled diagram of the apparatus which could be used

of dry ammonia in the laboratory.for the preparation

Be sure to identify in your diagram

where the reagents are placed,where the ammonia is dried, andwhere the ammonia is collected.

(4 marks)

Total 15 marks

END OF TEST

IF YOU FINISH BEFORE TIME IS CALLED, CIIECK YOUR WORK ON THIS TEST.

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Question No.

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Question No.

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