CXC CSEC Chemistry 2017 June P2

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CARIBBEAN EXAMINATIONS COUNCIL CARIBBEAN SECONDARY EDUCATION CERTIF'ICATE@ EXAMINATION

CHEMISTRY Paper 02 - General Proficiency 2 hours 30 minutes

READ THE FOLLOWING INSTRUCTIONS CAREFULLY. 1

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

2.

Write your answers in the spaces provided in this booklet.

3

Do NOT write in the margins.

4.

Where appropriate,ALLWORKING MUST BE SHOWN in this booklet.

5

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

6.

If you need to rewrite

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

7

If you

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

DO NOT TURN THIS PAGE UNTILYOU ARE TOLD TO DO SO. Copyright @ 2015 Caribbean Examinations Council All rights reserved.

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-5SECTION A

AnswerALL questions in this section. Write your responses in the spaces provided in this booklet. DO NOT spend more than 30 minutes on Question 1.

Hydrogen peroxide (HrOr) decomposes to produce oxygen and water. The rate of reaction can be increased by the use ofiatalysts. The effect of the mass of a catalyst on the rate of decomposition of

1

hydrogen peroxide was investigated.

For EACH experiment, a different mass of the catalyst, manganese(IV) oxide gvtnOr) was combined with 50 cm3 of 0.8 mol dm3 hydrogen peroxide solution and the volume of oxygen produced was measured. The masses used are shown on the balances displayed in Figure 1.

0

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Expt #4

Expt #3

E,xpt#2

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Expt #5

Expt #6

Figure L. Masses of manganese(IV) oxide

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-6(a)

The rate of the reaction for EACH quantity of catalyst used was calculated and recorded in Table l. Use the balances shown in Figure 1 on page 5 to complete Table r.

TABLE

I

: RATE OF REACTION BY MASS OF MANGANESE(IV) OXrDE

Experiment

Mass of Manganese(IV) Oxide (g)

Rate of Reaction

I

0.0

0.0

(mLs{)

2

0.6

J

1.8

4

2.7

5

4.5

6

5.0

(5 marks)

(b)

Define the term 'rate of reaction'

(1mark) (c)

Write

a balanced chemical equation

to show the decomposition of hydrogen peroxide.

(2 marks) (d)

Using the axes in Figure 2 on page 7, plot a graph of rate of reaction versus mass of manganese(IV) oxide from the information in Table 1. One point has already been plotted. Circle the plotted points on the graph 8, and draw the line of best fit. (5 marks)

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l=

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tr H.

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3

2

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Mass of manganese(IV) oxide

t-:

Fi IJ

Figure 2. Rate of reaction versus mass of manganese(IV) oxide

E N

Ei ..ri

= iii

'-.

=

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t-(e)

Using your graph,

(i)

describe the relationship between the rate of reaction and the mass of the catalyst

(2 marks)

(iD

determine the rate of reaction using 3.0 g of the catalyst

(1mark)

(iii)

determine the volume of oxygen produced after 10 s using the value obtained from (e) (ii).

(1 mark)

(0

Complete and label the energy profile diagram in Figure 3 to show how a catalyst affects the rate ofreaction.

Energy level

Reactants--------

= :n i:: :jj

xEJ ts

Products

sre Time

|rJ

}!u

E tr'igure 3. Energy profile diagram

E

=

E

(2 marks)

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:ral r.: t*t A

*/

z :AJ

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Draw a labelled diagram of the apparatus (including reagents) that was used to conduct the experiment and collect the gas.

(4 marks)

(h)

List TWO other factors which can affect the rate of reaction.

(2 marks) Totat 25 marks

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Lesley was asked to weigh 0.20 moles of aspirin to be used in a supervised experiment during her chemistry laboratory class. Before doing so, she read the label, at the back of the bottle, shown in Figure 4.

Aspirin Drug Aspirin is used as an analgesic to relieve minor aches and pains, reduce fever, and as an anti-inflammatory medication.

Formula:

CeH8O4

Molar mass: 180 g mol-r Melting point: 136 "C Boiling point: 140 "C Density: 1.40 g cmi

Figure 4. Aspirin label The information in Figure 4 may be used to answer the following questions

(i)

Define EACH of the following terms:

Mole:

Molar mass

(2 marks)

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Calculate the mass Lesley would have to weigh to obtain 0.20 moles of aspirin.

(1mark)

(iiD

Jared, another student in Lesley's class, weighed 18.0 g number of moles of aspirin he weighed.

of aspirin. Calculate

the

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,.Q

(1 mark)

(b)

Ethanoic acid is one of the products of the hydrolysis of aspirin as shown in Figure 5.

COOH

COOH

jE

ococH3

-:+N

-:.9

OH

-:ls

+

+ HrO

:95 --E

cH3cooH Ethanoic acid

.ti 'tr.:1:

Aspirin

:,E -:lii

Figure 5. The hydrolysis of aspirin Calculate the mass of ethanoic acid formed when Jared's 18.0 g of aspirin is hydrolysed.

[Molar mass of ethanoic acid = 60.0 g moft]

.X --_r*l

::E

:.= :ti. LEi

:ir i|r .trr

(3 marks)

fl:f{

-]rr

n(

*

-1ri .A -\i

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E -Q

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-12(c)

Ethanoic acid is known to be an electrolyte.

(i)

.I$.-r*I.

Ei -!i{-

Define the term'electrolSrte'.

.Eti 'E-

.H. -Fir:

,kl :r-=[--

(l mark)

.IRr -+r--

(ii)

Identiff the ions that

s:

are produced from ethanoic acid during electrolysis

-t=

--Fr-.

(2 marks)

(iii)

Define the term'cathode'

=:*: {*},

s,

(1mark)

(iv)

Predict which ion from (c) (ii)

.t$. -{d: .Frrr

E S+.

will migrate to the cathode.

E f+

.tii:

fi

'lFl:E: .E-

(1mark)

(v)

'E+,

.s

E. ss-

Is ethanoic acid a strong or weak electrolyte? Explain your answer.

:E

irt f*:

(3 marks)

.-+{4i-

Total 15 marks

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f+ T.

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-13(a)

Compound P has the condensed molecular formula C[CH2CH2CH2CH3.

(i)

State the name and the general formula ofthe homologous series to which Compound P belongs.

Name of homologous

series:

ii;il;

General formula: .....

(iD

(l mark)

State ONE use of ComPound P.

(1 mark)

(iiD

Define the term 'structural isomerism'.

(2 marks)

(iv)

Draw the FULLYDISPLAYED structure of ONE isomer of Compound P

Isomer of Compound P (2 marks)

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-14(b)

Compound Q has the condensed molecular formula CH3CH2COOH.

(i)

Explain why Compound Q is soluble in water.

(2 marks)

(ii)

Is the solution of Compound Q acidic or basic? State a reason for your answer.

(2 marks)

(c)

Compound R, CHrCH:CHCH3, reacts with bromine to form Compound S

(i)

State the expected colour change for the reaction.

(2 marks)

(ii)

Draw the FULLY DISPLAYED structural formula of Compound

Compound

S.

S

(2 marks)

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_15_

SECTION B

AnswerALL questions in this section. Write your responses in the

spaces provided

in this booklet.

Calcium carbonate, CaCO, and sodium nitrate, NaNO, are two salts that are used in the manufacturing industry

4.

(a)

Deflne the term 'salt'. Identit/ ONE product that EACH of the salts mentioned above is used to manufacture.

(4 marks)

(b)

Outline the laboratory preparation of

a pure,

dry sample of CaCOr. Include in your response

a balanced chemical equation.

(6 marks)

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Write a balanced chemical equation with state symbols to illustrate how NaNO, can be

-N!

prepared in the laboratory. Explain why NaNO, cannot be prepared utilizing the same method used for the preparation of CaCOr.

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(5 marks)

Total 15 marks

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El Dorado, White Oak, Appleton and Cockspur are a few of the famous rum brands of the Caribbean. The main processes of rum making are fermentation and distillation.

3.

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- \'. t5i r+:

(a)

Describe the process of fermentation. Include in your description

t!+i

t\i.

Fr*.

a

zj :tiii: ,I+.

H: 'Ei:: G3i

N.

the starting material the role of yeast the reaction conditions a balanced chemical equation for the reaction.

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.rlt-

==

r=+.

-ki ..9+

.x.

:.ts: :I.a-

iitt

:.Ei:

f-I+

it+ '.t'. :-trr.

:-s

(7 marks)

i'.R,

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Ic

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-18(b)

After fermentation, the product is usually filtered and distilled. Suggest why distillation is necessary and draw a simple labelled diagram ofthe apparatus which can be used for distilling the fermented product in a school's laboratory.

(6 marks) (c)

In some countries, the Breathalyzer test is used to determine the level of alcohol on the breath of suspected drunk drivers. Identifu the main reagent used in the Breathalyzer test and hence state the type ofreaction that occurs during the test.

(2 marks)

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In solution, two metals A and B formA* and 82* ions respectively. MetalA displaces Fe from a solution containing Fe2* ions but metal B does NOT.

(D

Arrange the metalsA, B and Fe in order of reactivity from LEAST reactive to MOST reactive. Write a balanced chemical equation to show the reaction between metal A and Fe2* ions.

(4 marks)

(ii)

Metal A is placed in a solution of copper(Il) sulfate, CuSOo (aq). Write an equation for the reaction. State ONE observable change that will occur and explain why this reaction takes place.

(5 marks)

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(iii)

For EACH metal, A and B, state ONE method that can be used to extract it from its respective oxide. Give a reason for EACH answer.

(4 marks) (b)

Metal alloys are often used for making objects found in our daily lives. Name an alloy of iron and state ONE of its uses.

(2 marks)

Total 15 marks

END OF'TEST

IF YOU F'INISH BEFORE TIME IS CALLED, CHECK YOUR WORK ON THIS TEST.

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