g-model_paper_2-igcse chem cd.pdf

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1Model exam papers ndash Paper 2copy Cambridge University Press IGCSE Chemistry

Model exam papers

Paper 2

1 Below is a list o elements Use these elements to answer the questions

below

Each element may be used once more than once or not at all

aluminium

helium

magnesium

potassium

nitrogenoxygen

phosphorus

a Which elements are commonly ound in ertilisers

[3]

b Which two elements are in Period 2 o the Periodic able

and

[2]

c Which elements are gases at room temperature

[2]

d Which element reacts with water to orm an alkali

[1]

e Which two elements have two electrons in their outside orbit

and [2]

otal [10]



2 Model exam papers ndash Paper 2copy Cambridge University Press IGCSE Chemistry

2 Platinum is a rare and valuable metal which is ound in the

ground as a pure metal

itanium is a common metal which is quite expensive because it is

hard to extract

Iron is a common metal which can be extracted rom its ore byheating with carbon

a Using the inormation above place the three metals in order o

reactivity

[1]

b Platinum is an unreactive metal and is used in jewellery

because it doesnrsquot corrode

Give another important use o platinum

[1]

c itanium is an important engineering metal It is stronger

than steel but is only hal as heavy

Suggest why titanium is not used or building motor vehicles

[1]

d

firebrick lining

raw materials

waste gases

air

slag

molten iron




Te diagram above shows a blast urnace used or the

extraction rom its ore

i Name the ore rom which iron is extracted

[1]

ii What other raw materials are added at the top o the

urnace besides the ore

and [2]

iii Name two gases which are ound in the waste gases which

come out rom the top o the urnace

and [2]

e Te iron which comes out o the blast urnace (cast iron)

contains carbon which makes it brittle

How is this carbon removed

[2]

f Te result o removing some o the carbon is an alloy called steel

What is the meaning o the term alloy

[1]

g Stainless steel can be made by adding nickel and chromium to

steel Give a use o stainless steel

[1]

otal [12]

3 A student made a soluble salt o the metal zinc by the ollowing

method

A Acid was poured into a beaker

B Zinc was added to the acid until in excess

C Te beaker was warmed and then stirred

D When the reaction was over the remaining zinc was removed

E Te solution was then boiled gently until crystallisation point

F Te remaining solution was lef to cool

a How would the student know that excess zinc had been added

[1]




b In the space below draw and label apparatus suitable to

perorm step D

[3]

c How would the student know that the solution had reached

crystallisation point (step E)

[1]

d A sample o the salt obtained was dissolved in distilled water

and tested by adding barium chloride solution A white

precipitate was ormed

What was the name o the acid that the student used in step A

[1]

e In a second test aqueous ammonia was added to a solution o the

salt 1047297rst slowly and then in excess

What observations were made

[3]

otal [9]




4 A sample o air was taken in the middle o a city Te air was analysed

and the gases listed below were ound to be present

carbon dioxide

carbon monoxide

methane

nitrogennitrogen dioxide

oxygen

sulfur dioxide

a Which gas would be present in the greatest quantity

[1]

b Which two gases could cause acid rain

and [2]

c Which two gases are most responsible or global warming

and [2]

d Which gas is produced by plants in photosynthesis

[1]

e In the diagram below join each polluting gas to its correct

source [3]

Carbon monoxide

Methane

Sulfur dioxide Cows and sheep

Power stations

Car exhausts

f Argon is always present in the air but it is not in the list above

Suggest why it might not have been detected when the gas was

analysed

[1]

otal [10]




5

negativeelectrode

carbonrods

concentratedaqueous sodiumchloride andUniversal lndicator

positiveelectrode

+ ndash

Te diagram shows an apparatus which can be used to electrolyse

concentrated sodium chloride solution (brine)

a Chlorine is one o the products o this electrolysis At which

electrode is it ormed

[1]

b At the other electrode the Universal Indicator solution turns

purple What substance causes this change

[1]

c Brine is a mixture o solid sodium chloride and water Brine conducts

electricity but water does not Why doesnrsquot water conduct electricity

[1]

d Sodium chloride is made up o ions Why does it conduct when it

is a solution but not when it is a solid

[1]

e Te electrodes are made rom graphite a orm o carbon

Graphite has a giant covalent structure What unusual

property does it have that allows it to be used as an electrode

[1]

f Diamond is another orm o carbon with a different type o giant

covalent structure

By comparing their structures explain why diamond but not

graphite can be used in cutting

[2]

otal [7]




6 A student wished to make a sample o ertiliser by reacting ammonia

solution with nitric acid

20 cm3 o ammonia was placed in a 1047298ask and Universal Indicator

was added Nitric acid was added 2 cm3 at a time using a measuring

cylinder and the pH o the solution was noted afer each addition Te

results are shown in the table below

a Plot the pH values on the grid below

Join the points to each other using straight lines [4]

p H

0 2 4 6

Volume of acid added cm3

8 10 12 14 16 18 20

Volumeadded cm3

0 2 4 6 8 10 12 14 16 18 20

pH 13 13 13 12 12 9 3 2 2 1 1




b Use your graph to estimate how much acid was needed to exactly

neutralise the ammonia

[2]

c Te equation or the reaction is NH3 + HNO3 rarr NH4NO3

Rewrite this equation as a word equation

[2]

d Why is this ertiliser a particularly good one

[1]

otal [9]

7 Te diagram shows a ractionating column used or separating

petroleum into useul ractions

fractionsfuel gas

petrol

paraffin

light gas oil

diesel

lubricating fraction

bitumen

crude oil

a Draw a lsquotimesrsquo on the diagram at the point where the temperature is

highest [1]

b Paraffi n is ofen called kerosene What is its major use

[1]




c Te uel gas (re1047297nery gas) raction contains compounds which are gases

at room temperature Tese gases are ofen cracked to orm alkenes

What is meant by the terms cracking and alkene

Cracking [1]

Alkene [1]

d Butane C4H10 can be cracked to orm two molecules o ethene C2H4

Complete the equation below by identiying the other product

C4H10 rarr 2C2H4 + [1]

e Ethene can be converted into ethanol by reacting it with steam

Write a word equation or this reaction

[2]

f In the space below draw the structure o the ethanol molecule

showing all atoms and bonds

[2]

g State another method o making ethanol and give a use or the

compound

Method

Use [2]

otal [11]

8 a Complete the table below by 1047297lling in the empty spaces

Symbol Number ofprotons

Number ofneutrons

Number ofelectrons

H 1 1 1

8 8 8

O2minus 8 8

C 6 6

1 0 1

[4]




b What is the meaning o the term isotope

[1]

c Using an example rom the table above give an example o

isotopes

[2]

d 235U is an example o an isotope used to produce energy

How is it used

[1]

e Hydrogen is also used as a uel Write a word equation to showwhat happens when hydrogen burns

[2]

f Hydrogen was once used in airships but now helium is used

instead

Why is helium a suitable gas or use in airships

[2]

otal [12]




2 Platinum is a rare and valuable metal which is ound in the

ground as a pure metal

itanium is a common metal which is quite expensive because it is

hard to extract

Iron is a common metal which can be extracted rom its ore byheating with carbon

a Using the inormation above place the three metals in order o

reactivity

[1]

b Platinum is an unreactive metal and is used in jewellery

because it doesnrsquot corrode

Give another important use o platinum

[1]

c itanium is an important engineering metal It is stronger

than steel but is only hal as heavy

Suggest why titanium is not used or building motor vehicles

[1]

d

firebrick lining

raw materials

waste gases

air

slag

molten iron







[1]



and [2]



and [2]




[2]



[1]



[1]

otal [12]


method








[1]





perorm step D

[3]



[1]





[1]




[3]

otal [9]






carbon dioxide

carbon monoxide

methane


oxygen

sulfur dioxide


[1]


and [2]


and [2]


[1]


source [3]

Carbon monoxide

Methane


Power stations

Car exhausts



analysed

[1]

otal [10]




5

negativeelectrode

carbonrods


positiveelectrode

+ ndash





[1]



[1]



[1]



[1]




[1]


covalent structure



[2]

otal [7]












p H

0 2 4 6


8 10 12 14 16 18 20

Volumeadded cm3

0 2 4 6 8 10 12 14 16 18 20

pH 13 13 13 12 12 9 3 2 2 1 1






[2]



[2]


[1]

otal [9]



fractionsfuel gas

petrol

paraffin

light gas oil

diesel


bitumen

crude oil


highest [1]


[1]







Cracking [1]

Alkene [1]



C4H10 rarr 2C2H4 + [1]



[2]



[2]


compound

Method

Use [2]

otal [11]



Number ofneutrons

Number ofelectrons

H 1 1 1

8 8 8

O2minus 8 8

C 6 6

1 0 1

[4]





[1]


isotopes

[2]


How is it used

[1]


[2]


instead


[2]

otal [12]







[1]



and [2]



and [2]




[2]



[1]



[1]

otal [12]


method








[1]





perorm step D

[3]



[1]





[1]




[3]

otal [9]






carbon dioxide

carbon monoxide

methane


oxygen

sulfur dioxide


[1]


and [2]


and [2]


[1]


source [3]

Carbon monoxide

Methane


Power stations

Car exhausts



analysed

[1]

otal [10]




5

negativeelectrode

carbonrods


positiveelectrode

+ ndash





[1]



[1]



[1]



[1]




[1]


covalent structure



[2]

otal [7]












p H

0 2 4 6


8 10 12 14 16 18 20

Volumeadded cm3

0 2 4 6 8 10 12 14 16 18 20

pH 13 13 13 12 12 9 3 2 2 1 1






[2]



[2]


[1]

otal [9]



fractionsfuel gas

petrol

paraffin

light gas oil

diesel


bitumen

crude oil


highest [1]


[1]







Cracking [1]

Alkene [1]



C4H10 rarr 2C2H4 + [1]



[2]



[2]


compound

Method

Use [2]

otal [11]



Number ofneutrons

Number ofelectrons

H 1 1 1

8 8 8

O2minus 8 8

C 6 6

1 0 1

[4]





[1]


isotopes

[2]


How is it used

[1]


[2]


instead


[2]

otal [12]





perorm step D

[3]



[1]





[1]




[3]

otal [9]






carbon dioxide

carbon monoxide

methane


oxygen

sulfur dioxide


[1]


and [2]


and [2]


[1]


source [3]

Carbon monoxide

Methane


Power stations

Car exhausts



analysed

[1]

otal [10]




5

negativeelectrode

carbonrods


positiveelectrode

+ ndash





[1]



[1]



[1]



[1]




[1]


covalent structure



[2]

otal [7]












p H

0 2 4 6


8 10 12 14 16 18 20

Volumeadded cm3

0 2 4 6 8 10 12 14 16 18 20

pH 13 13 13 12 12 9 3 2 2 1 1






[2]



[2]


[1]

otal [9]



fractionsfuel gas

petrol

paraffin

light gas oil

diesel


bitumen

crude oil


highest [1]


[1]







Cracking [1]

Alkene [1]



C4H10 rarr 2C2H4 + [1]



[2]



[2]


compound

Method

Use [2]

otal [11]



Number ofneutrons

Number ofelectrons

H 1 1 1

8 8 8

O2minus 8 8

C 6 6

1 0 1

[4]





[1]


isotopes

[2]


How is it used

[1]


[2]


instead


[2]

otal [12]






carbon dioxide

carbon monoxide

methane


oxygen

sulfur dioxide


[1]


and [2]


and [2]


[1]


source [3]

Carbon monoxide

Methane


Power stations

Car exhausts



analysed

[1]

otal [10]




5

negativeelectrode

carbonrods


positiveelectrode

+ ndash





[1]



[1]



[1]



[1]




[1]


covalent structure



[2]

otal [7]












p H

0 2 4 6


8 10 12 14 16 18 20

Volumeadded cm3

0 2 4 6 8 10 12 14 16 18 20

pH 13 13 13 12 12 9 3 2 2 1 1






[2]



[2]


[1]

otal [9]



fractionsfuel gas

petrol

paraffin

light gas oil

diesel


bitumen

crude oil


highest [1]


[1]







Cracking [1]

Alkene [1]



C4H10 rarr 2C2H4 + [1]



[2]



[2]


compound

Method

Use [2]

otal [11]



Number ofneutrons

Number ofelectrons

H 1 1 1

8 8 8

O2minus 8 8

C 6 6

1 0 1

[4]





[1]


isotopes

[2]


How is it used

[1]


[2]


instead


[2]

otal [12]




5

negativeelectrode

carbonrods


positiveelectrode

+ ndash





[1]



[1]



[1]



[1]




[1]


covalent structure



[2]

otal [7]












p H

0 2 4 6


8 10 12 14 16 18 20

Volumeadded cm3

0 2 4 6 8 10 12 14 16 18 20

pH 13 13 13 12 12 9 3 2 2 1 1






[2]



[2]


[1]

otal [9]



fractionsfuel gas

petrol

paraffin

light gas oil

diesel


bitumen

crude oil


highest [1]


[1]







Cracking [1]

Alkene [1]



C4H10 rarr 2C2H4 + [1]



[2]



[2]


compound

Method

Use [2]

otal [11]



Number ofneutrons

Number ofelectrons

H 1 1 1

8 8 8

O2minus 8 8

C 6 6

1 0 1

[4]





[1]


isotopes

[2]


How is it used

[1]


[2]


instead


[2]

otal [12]












p H

0 2 4 6


8 10 12 14 16 18 20

Volumeadded cm3

0 2 4 6 8 10 12 14 16 18 20

pH 13 13 13 12 12 9 3 2 2 1 1






[2]



[2]


[1]

otal [9]



fractionsfuel gas

petrol

paraffin

light gas oil

diesel


bitumen

crude oil


highest [1]


[1]







Cracking [1]

Alkene [1]



C4H10 rarr 2C2H4 + [1]



[2]



[2]


compound

Method

Use [2]

otal [11]



Number ofneutrons

Number ofelectrons

H 1 1 1

8 8 8

O2minus 8 8

C 6 6

1 0 1

[4]





[1]


isotopes

[2]


How is it used

[1]


[2]


instead


[2]

otal [12]






[2]



[2]


[1]

otal [9]



fractionsfuel gas

petrol

paraffin

light gas oil

diesel


bitumen

crude oil


highest [1]


[1]







Cracking [1]

Alkene [1]



C4H10 rarr 2C2H4 + [1]



[2]



[2]


compound

Method

Use [2]

otal [11]



Number ofneutrons

Number ofelectrons

H 1 1 1

8 8 8

O2minus 8 8

C 6 6

1 0 1

[4]





[1]


isotopes

[2]


How is it used

[1]


[2]


instead


[2]

otal [12]







Cracking [1]

Alkene [1]



C4H10 rarr 2C2H4 + [1]



[2]



[2]


compound

Method

Use [2]

otal [11]



Number ofneutrons

Number ofelectrons

H 1 1 1

8 8 8

O2minus 8 8

C 6 6

1 0 1

[4]





[1]


isotopes

[2]


How is it used

[1]


[2]


instead


[2]

otal [12]





[1]


isotopes

[2]


How is it used

[1]


[2]


instead


[2]

otal [12]

g-model_paper_2-igcse chem cd.pdf

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