0620_w01_qp_2

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This question paper consists of 16 printed pages.

SB (CW/JB) QK11131/3 © UCLES 2001 [Turn over

International General Certificate of Secondary Education

UNIVERSITY OF CAMBRIDGE LOCAL EXAMINATIONS SYNDICATE

CHEMISTRY 0620/2PAPER 2

OCTOBER/NOVEMBER SESSION 2001 1 hour

Candidates answer on the question paper.No additional materials are required.

TIME 1 hour

INSTRUCTIONS TO CANDIDATES

Write your name, Centre number and candidate number in the spaces at the top of this page.

Answer all questions.

Write your answers in the spaces provided on the question paper.

INFORMATION FOR CANDIDATES

The number of marks is given in brackets [ ] at the end of each question or part question.A copy of the Periodic Table in printed on page 16.

CandidateCentre Number Number

Candidate Name

FOR EXAMINER’S USE

3

2

1

4

7

TOTAL

6

5

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1 Some jewellery is made from an alloy of gold and nickel.

Nickel is a transition element.

(a) State two properties of transition metals that are not shown by other metals.

1. ......................................................................................................................................

2. ..................................................................................................................................[2]

(b) Sweat from the skin is slightly acidic and reacts with jewellery containing nickel.

(i) Suggest how you could find out the pH of the sweat on the surface of your skin.

...................................................................................................................................

...............................................................................................................................[2]

(ii) Which one of the values represents a pH which is slightly acidic.

Put a ring around the correct answer.

pH 2 pH 6 pH 7 pH 8 pH 13 [1]

(iii) Nickel ions are formed when nickel reacts with sweat.

These ions cause the skin to become very sensitive.

State what is meant by the term ion .

...............................................................................................................................[1]

(iv) Complete the equation to show the formation of nickel ions from nickel.

Ni → Ni2+ + ... e- [1]

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(c) The table shows the volumes of gas produced in one minute when different metalsreacted with hydrochloric acid. All other conditions remained the same in theexperiment.

Put these metals in the correct order of reactivity.

[1]

(d) Alloys of zinc are used for making zip-fasteners.

Describe a test for zinc ions

test ...................................................................................................................................

result ................................................................................................................................

......................................................................................................................................[3]

For

Examiner’s

Use

metal volume of gas

/cm3

iron 8

magnesium 56

nickel 3

zinc 14

most reactive

least reactive

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2 The table shows some properties of five substances, A, B, C, D and E.

(a) Which one of the substances A to E is a metal?

......................................................................................................................................[1]

(b) Which one of the substances A to E has a giant structure of ions?

......................................................................................................................................[1]

(c) Which one of the substances A to E has the lowest melting point?

......................................................................................................................................[1]

(d) (i) Which one of the substances A to E is a gas at room temperature?

...............................................................................................................................[1]

(ii) Describe the arrangement and movement of the particles in a gas.

Arrangement .............................................................................................................

Movement .............................................................................................................[2]

(e) Two of the substances in the table are compounds.

Explain what is meant by the term compound.

..........................................................................................................................................

......................................................................................................................................[2]

For

Examiner’s

Use

substance melting point boiling point conducts electricity conducts electricity / °C / °C in the solid state when molten

A -7 59 no no

B 801 1413 no yes

C 1083 2567 yes yes

D -189 -186 no no

E 1610 2230 no no

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(f) The table below gives information about the electron arrangement of a sodium atomand a chlorine atom.

(i) Sodium chloride, NaCl , has an ionic giant structure.

Describe the changes in electron arrangement that take place when sodiumchloride is formed from sodium and chlorine atoms.

...................................................................................................................................

...................................................................................................................................

...................................................................................................................................

...............................................................................................................................[4]

(ii) Calculate the relative formula mass of sodium chloride.

Use the Periodic Table to help you.

[2]

For

Examiner’s

Use

atom electron arrangement

sodium 2.8.1

chlorine 2.8.7

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3 Use the Periodic Table to help you answer these questions.

(a) Tellurium, Te, is in Group VI of the Periodic Table.

In which Period is tellurium?

......................................................................................................................................[1]

(b) What determines the order of the elements in the Periodic Table?

......................................................................................................................................[1]

(c) How many electrons does an atom of tellurium have in its outer shell?

......................................................................................................................................[1]

(d) State the name of a metallic element which is in the same Period as tellurium.

......................................................................................................................................[1]

(e) Tellurium reacts with excess chlorine to form tellurium(IV) chloride, TeCl 4.

(i) Chlorine is a diatomic molecule.

Explain what is meant by

1 diatomic , ............................................................................................................

2. molecule . ...........................................................................................................

.......................................................................................................................[3]

(ii) Complete the following equation for the reaction between tellurium and excesschlorine.

Te + ... Cl 2 → TeCl 4 [1]

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4 Ethanol, C2H5OH, is formed when yeast ferments a solution of glucose in water.

(a) State the name of the gas given off during fermentation.

......................................................................................................................................[1]

(b) Fermentation is caused by the action of enzymes in the yeast.

Explain the meaning of the term enzyme .

..........................................................................................................................................

......................................................................................................................................[2]

(c) The boiling point of ethanol is 78 °C.

Explain how ethanol can be separated from water.

..........................................................................................................................................

..........................................................................................................................................

......................................................................................................................................[3]

(d) Draw the structure of ethanol to show how the atoms and bonds are arranged.

[1]

(e) Ethanol can also be produced by the following reaction:

catalyst

C2H4 + H2O → C2H5OHsteam ethanol

(i) Choose a word from the list below which best describes this reaction.


addition combustion neutralisation polymerisation [1]

(ii) What is the function of the catalyst?

...............................................................................................................................[1]

(iii) State the name of the reactant, C2H4.

...............................................................................................................................[1]

(iv) The other reactant is steam. The steam is made by boiling water.

What is the boiling point of water?

...............................................................................................................................[2]

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(f) State one use of ethanol.

......................................................................................................................................[1]

(g) State the names of the products formed when ethanol burns.

............................................................... and ...............................................................[2]

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5 Buckminsterfullerene is a form of carbon which was discovered in 1985. It is shaped like afootball and has the formula C60. Its structure is shown below.

(a) Is buckminsterfullerene a compound or an element?

Give a reason for your answer.

..........................................................................................................................................

......................................................................................................................................[1]

(b) Choose a word from the list below which best describes the bonding shown on thediagram of buckminsterfullerene.


covalent ionic metallic [1]

(c) Buckminsterfullerene reacts with diphenyldiazomethane (DDM).

The structure of DDM is shown below.

(i) State the total number of atoms in one molecule of DDM.

...............................................................................................................................[1]

(ii) Write down the molecular formula of DDM.

[1]

C

C

C

H

H

H

NN

H

H

C

C C

C

C

C

H

H

H

H

H

C

C C

C

– +

carbon atom

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(iii) When buckminsterfullerene reacts with DDM, nitrogen gas, N2, is given off.

State the total number of protons in one molecule of nitrogen.

...............................................................................................................................[1]

(d) Buckminsterfullerene is one of the three forms of solid carbon.

State the names of the two other forms of carbon and give a use for each.

name of first form ......................................................................................................

use of first form ......................................................................................................

name of second form ......................................................................................................

use of second form ......................................................................................................[4]

(e) (i) Complete the word equation for the incomplete combustion of carbon.

carbon + oxygen → ............................... ............................... [1]

(ii) Write down the chemical formula of the product in this reaction.

...............................................................................................................................[1]

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6 In the ‘thermit’ reaction, aluminium powder reacts violently with iron(III) oxide.

A magnesium ribbon is lit to start the reaction.

The reaction gives out a great deal of heat.

The equation for the reaction is:

2Al (s) + Fe2O3(s) → Al 2O3(s) + 2Fe(s)

(a) Complete the following sentence about the ‘thermit’ reaction using words from the list.

addedelectrolysedneutralisedoxidised

reduced

In the ‘thermit’ reaction, the aluminium is ................................... to aluminium oxide and

the iron(III) oxide is ................................... to iron. [2]

magnesium ribbon

mixture of aluminium powderand iron(III) oxide

bucket of sand

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(b) Aluminium oxide which has been heated to a high temperature is called fusedaluminium oxide.

Fused aluminium oxide does not react with hydrochloric acid.

Iron reacts with hydrochloric acid.

(i) What would you observe when hydrochloric acid is added to a mixture of fusedaluminium oxide and iron?

...............................................................................................................................[1]

(ii) After reaction with hydrochloric acid, the mixture contains fused aluminium oxidesolid and a solution of iron(II) chloride.

Describe with the help of a labelled diagram, how you would separate thealuminium oxide from the iron(II) chloride solution.

[4]

(c) The magnesium ribbon used to start the ‘thermit’ reaction burns in oxygen and gives outheat.

What term describes a reaction that gives out heat?

......................................................................................................................................[1]

(d) In an oxyacetylene torch, oxygen is used with acetylene to produce a flame with atemperature of about 3000 °C.

State one use of this flame.

......................................................................................................................................[1]

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7 Chlorine is produced by the electrolysis of concentrated sodium chloride solution.

An electrolysis cell for producing chlorine is shown below.

(a) Seawater is a source of sodium chloride.

A sample of seawater had the following composition:

sodium chloride 5.6 gmagnesium chloride 1.4 g

magnesium sulphate 1.2 gwater 191.8 g

Calculate the percentage of sodium chloride in this sample of seawater.

[1]

(b) The solution of sodium chloride used for electrolysis is about ten times moreconcentrated than in seawater.

State how you could increase the concentration of the salts in seawater.

......................................................................................................................................[1]

(c) What happens to the concentration of the sodium chloride as electrolysis takes place?

......................................................................................................................................[1]

(d) At which electrode is chlorine produced during the electrolysis of concentrated sodiumchloride solution?

......................................................................................................................................[1]

concentratedsolution ofsodium chloride

mixture of mercuryand sodium

mercury cathoderecirculatedmercury

graphite anode

chlorine

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(e) State one property that graphite must have if it is to be used as an electrode.

......................................................................................................................................[1]

(f) What property of mercury allows it to be recirculated easily?

......................................................................................................................................[1]

(g) Sodium is also produced during this electrolysis.

The sodium dissolves in the mercury.

The mixture of sodium and mercury then reacts with water.

Complete the word equation for the reaction of sodium with water.

sodium + water → ..................................................... + ......................... [2]

(h) The graph shows the world production of chlorine during the 20th century.

Over which ten year period did chlorine production increase most rapidly?

......................................................................................................................................[1]

1900 1910 1920 1930 1940 1950 1960 1970 1980 1990

35

30

25

20

15

10

5

0

year

p r o d u c t i o n o

f c h l o r i n e /

m i l l i o n s o f t o n n e s p e r y e a r

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(i) Chloroethene molecules join together to form poly(chloroethene).

chloroethene part of a poly(chloroethene) molecule

(i) What type of chemical reaction is shown in this equation?

........................................................................................................................................[2]

(ii) Poly(chloroethene) is used as an electrical insulator.

What is meant by the term electrical insulator ?

........................................................................................................................................[1]

C

CHH HH HH HH

+C

C

H Cl H Cl H Cl H Cl

+C

C

+C

C

C

CHH HH

C

C

H Cl H Cl H Cl H Cl

C C

HHC

HHC

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G r o u p

D A

T A S H E E T

T h e P e r i o d i c T a b l e o f t h e E l e m e n t s

1 4 0

C e

C e r i u m

5 8

1 4 1

P r

P r a s e o d y m i u m

5 9

1 4 4

N d

N e o d y m i u m

6 0

P m

P r o m e t h i u m

6 1

1 5 0

S m

S a m

a r i u m

6 2

1 5 2

E u

E u r o p i u m

6 3

1 5 7

G d

G a d o l i n i u m

6 4

1 5 9

T b

T e r b i u m

6 5

1 6 2

D y

D y s p r o s i u m

6 6

1 6 5

H o

H o l m i u m

6 7

1 6 7

E r

E r b i u m

6 8

1 6 9

T m

T h u l i u m

6 9

1 7 3

Y b

Y t t e r b i u m

7 0

1 7 5

L u

L u t e t i u m

7 1

2 3 2

T h

T h o r i u m

9 0

P a

P r o t a c t i n i u m

9 1

2 3 8 U

U r a n i u m

9 2

N p

N e p t u n i u m

9 3

P

u P l u t o n i u m

9 4

A m

A m e r i c i u m

9 5

C m

C u r i u m

9 6

B k

B e r k e l i u m

9 7

C f

C a l i f o r n i u m

9 8

E s

E i n s t e i n i u m

9 9

F m

F e r m i u m

1 0 0

M d

M e n d e l e v i u m

1 0 1

N o

N o b e l i u m

1 0 2

L r

L a w r e n c i u m

1 0 3

1 H H y d r o g e n

1

7 L i

L i t h i u m

3

2 3

N a

S o d i u m

1 1

2 4

M g

M

a g n e s i u m

1 2

4 0

C a

C a l c i u m

2 0

4 5

S c

S c a n d i u m

2 1

4 8 T i

T i t a n i u m

2 2

5 1 V

V a n a d i u m

2 3

5 2 C r

C h r o m i u m

2 4

5 5

M n

M a n g a n e s e

2 5

5 6 F e

I r o n

2 6

5

9

C

o C o

b a l t

2 7

5 9 N i

N i c k e l

2 8

6 4

C u

C o p p e r

2 9

6 5

Z n

Z i n c

3 0

7 0

G a

G a l l i u m

3 1

2 7 A l

A l u m i n i u m

1 3

1 1 B

B o r o n

5

1 2 C

C a r b o n

6

1 4 N

N i t r o g e n

7

1 6 O

O x y g e n

8

1 9 F

F l u o r i n e

9

2 8 S i

S i l i c o n

1 4

3 1 P

P h o s p h o r u s

1 5

3 2 S

S u l p h u r

1 6

3 5 . 5

C l

C h l o r i n e

1 7

4 0 A r

A r g o n

1 8

2 0

N e

N e o n

1 0

4 H e

H e l i u m

2

7 3

G e

G e r m a n i u m

3 2

7 5

A s

A r s e n i c

3 3

7 9

S e S e l e n i u m

3 4

8 0 B r

B r o m i n e

3 5

8 4 K r

K r y p t o n

3 6

3 9 K

P o t a s s i u m

1 9

8 8 S r

S t r o n t i u m

3 8

8 9 Y

Y t t r i u m

3 9

9 1 Z r

Z i r c o n i u m

4 0

9 3

N b

N i o b i u m

4 1

9 6

M o

M o l y b d e n u m

4 2

T c

T e c h n e t i u m

4 3

1 0 1

R u

R u t h e n i u m

4 4

1 0 3

R

h R h o

d i u m

4 5

1 0 6

P d

P a l l a d i u m

4 6

1 0 8

A g

S i l v e r

4 7

1 1 2

C d

C a d m i u m

4 8

1 1 5

I n

I n d i u m

4 9

1 1 9

S n

T i n

5 0

1 2 2

S b

A n t i m o n y

5 1

1 2 8

T e T e l l u r i u m

5 2

1 2 7

I I o d i n e

5 3

1 3 1

X e

X e n o n

5 4

1 3 7

B a

B a r i u m

5 6

1 3 9

L a

L a n t h a n u m

5 7

*

1 7 8

H f

H a f n i u m

7 2

1 8 1

T a

T a n t a l u m

7 3

1 8 4

W T u n g s t e n

7 4

1 8 6

R e

R h e n i u m

7 5

1 9 0

O s

O s m i u m

7 6

1 9 2

I

r I r i d

i u m

7 7

1 9 5

P t

P l a t i n u m

7 8

1 9 7

A u

G o l d

7 9

2 0 1

H g

M e r c u r y

8 0

2 0 4

T l

T h a l l i u m

8 1

2 0 7

P b

L e a d

8 2

2 0 9

B i

B i s m u t h

8 3

P o P o l o n i u m

8 4

A t

A s t a t i n e

8 5

R n

R a d o n

8 6

F r

F r a n c i u m

8 7

2 2 7

A c

A c t i n i u m

8 9

†

9 B e

B e r y l l i u m

4

I

I I

I I I

I V

V

V I

V I I

0

8 5

R b

R u b i d i u m

3 7

1 3 3

C s

C a e s i u m

5 5

2 2 6

R a

R a d i u m

8 8

T h e v o l u m e o f o n e m o l e o f a n y g a s i s 2 4 d m 3 a t r o o m t e m p e r a t u r e a n d p

r e s s u r e ( r . t . p . ) .

a X

b

a = r e l a t i v e a t o m i c m a s s

X = a t o m i c s y m b o l

b = p r o t o n ( a t o m i c ) n u m b e r

K e y

* 5 8 - 7 1 L a n t h a n o i d s e r i e s

† 9 0 - 1 0 3 A c t i n o i d s e r i e s

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