1- idea
2- steps
3- conclusion: (in the question)
habd
4- quantities
5- tools
6- fair comparison (same)
7- precautions
130
6
12
A catalyst is a substance that speeds up the rate of a chemical reaction and remains unchanged
at the end of the reaction.
Hydrogen peroxide solution, H2O2, breaks down to form oxygen. This decomposition is very slow
if a catalyst is not used.
Plan an investigation to show that copper(II) oxide is a suitable catalyst for this reaction.
You can use aqueous hydrogen peroxide and common laboratory apparatus.
Step 1 Show that copper(II) oxide catalyses the decomposition of hydrogen peroxide and
measure the rate of the reaction.
1- in a conical flask add 100 cm3 H2O2 (measuring cylinder)
2- connect quickly to a gas syringe
...........................................................................................................................................................
3- record volume of oxygen against time
...........................................................................................................................................................
...........................................................................................................................................................
...........................................................................................................................................................
4- repeat experiment using 10g of CuO using:
...........................................................................................................................................................
5- same volume of H2O2
...........................................................................................................................................................
6- same conc H2O2
7- temperature
...........................................................................................................................................................
8- APPARATUS
...........................................................................................................................................................
Conclusion: IF the rate in the 2nd experiment is faster
Step 2 Show that the copper(II) oxide is unchanged at the end of the decomposition.
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...........................................................................................................................................................
...........................................................................................................................................................
...........................................................................................................................................................
[Total: 8]
Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable
effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will
be pleased to make amends at the earliest possible opportunity.
To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge International
Examinations Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at www.cie.org.uk after
the live examination series.
Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local
Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.
© UCLES 2015
0620/61/M/J/15
153
12
5
E-numbers identify chemicals which are added to foods.
(a) E210 is benzoic acid. How could you show that a solution of benzoic acid is a weak acid?
test
result
[2]
(b) E110 is Sunset Yellow.
Outline a method you could use to show the presence of E110 in a food colouring.
You may draw a diagram to help answer the question.
1- set apparatus as shown
2- draw baseline using pencil
3- drops on baseline
4- solvent below the baseline
Conclusion: If one of the colors matches a pure sample
[4]
of E110 (same Rf) this
[Total: 6]
Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every
reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the
publisher will be pleased to make amends at the earliest possible opportunity.
Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local
Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.
© UCLES 2014
0620/06/SP/16
180
4
8
A sample of furniture cleaner contains aqueous sodium chloride, aqueous ammonia and sand.
(a)Give a test to show the presence of ammonia in the mixture.
............................................................................................................................................... [1]
(b)Plan an investigation to obtain a sample of
(i)
pure water from the mixture, ................................................................................................
..............................................................................................................................................
..............................................................................................................................................
........................................................................................................................................ [2]
(ii)pure sand from the mixture. .................................................................................................
..............................................................................................................................................
1- take 100 cm3
..............................................................................................................................................
2- filter using paper, funnel, flask
3- take residue
..............................................................................................................................................
4- wash using distilld water
........................................................................................................................................ [3]
5- dry in an oven
[Total: 6]
Conclusion: dry residue is pure sand
Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable
effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will
be pleased to make amends at the earliest possible opportunity.
To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge International
Examinations Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at www.cie.org.uk after
the live examination series.
Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local
Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.
© UCLES 2017
0620/61/M/J/17
188
8
4When iron nails rust, the mass of the nails increases.
Plan an experiment to investigate if iron nails rust more quickly in tap water or in distilled water.
You are provided with new iron nails and common laboratory apparatus.
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............................................................................................................................................................
............................................................................................................................................................
............................................................................................................................................................
............................................................................................................................................................
............................................................................................................................................................
............................................................................................................................................................
............................................................................................................................................................
...................................................................................................................................................... [6]
[Total: 6]
Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable
effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will
be pleased to make amends at the earliest possible opportunity.
To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge International
Examinations Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at www.cie.org.uk after
the live examination series.
Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local
Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.
© UCLES 2017
0620/62/O/N/17
9
4When solid C and solid D separately react with dilute hydrochloric acid, one reaction is exothermic
and one reaction is endothermic.
Plan an investigation to determine:
●●
●●
hich reaction is exothermic and which reaction is endothermic
w
which energy change is greater.
You are provided with solid C and solid D, dilute hydrochloric acid and common laboratory apparatus.
7- repeat using D
1- in a polystyrene cup
8- same conc HCl
2- add 200 cm3 HCl
............................................................................................................................................................
9- volume
3- record initial temperature
............................................................................................................................................................
10- type
4- add 5g C
............................................................................................................................................................
11- mass
5- stir using thermometer
12- SA
............................................................................................................................................................
6- record temp after 1 minute
13- apparatus
............................................................................................................................................................
14- initial temp
............................................................................................................................................................
............................................................................................................................................................
............................................................................................................................................................
Conclusion:
1- temp rise = exo
...................................................................................................................................................... [6]
2- temp drop = endo
3- greater temp difference = greater energy change [Total: 6]
............................................................................................................................................................
© UCLES 2018
0620/62/O/N/18
[Turn over
9
4
Steel nails rust in the presence of air and water. Plan an investigation to:
●●
●●
●●
s how that coating steel nails with paint helps to protect the nails from rusting
show that coating steel nails with zinc helps to protect the nails from rusting
determine which coating is more effective at protecting steel nails from rusting.
You are provided with:
●●
●●
●●
●●
ncoated steel nails
u
steel nails coated with paint
steel nails coated with zinc
common laboratory apparatus.
1- in a beaker add 100 cm3 water, over white tile
2- add 3 nails, 20g
............................................................................................................................................................
3- leave beaker open for days
............................................................................................................................................................
4- record color change against time
............................................................................................................................................................
............................................................................................................................................................
5- repeat using paint and zinc coating SEPARATELY using
6- same number
............................................................................................................................................................
7- mass
............................................................................................................................................................
8- SA
9- volume
............................................................................................................................................................
10- temperature
............................................................................................................................................................
11- apparatus
............................................................................................................................................................
...................................................................................................................................................... [6]
© UCLES 2019
0620/61/M/J/19
[Turn over
9
4
The table gives some information about the properties of three substances found in a hand cream.
substance
reaction with dilute nitric acid
polystyrene beads
no reaction
calcium carbonate
reacts and dissolves
sodium fluoride
dissolves
se the information in the table to plan an experiment to obtain a pure, dry sample of
U
polystyrene beads from this mixture of substances.
You are provided with a mixture of the three substances and common laboratory apparatus.
...........................................................................................................................................................
1- take 50 cm3 of the hand cream
...........................................................................................................................................................
2- transfer to beaker using spatula
3- add excess nitric acid (200 cm3) measured by a measuring
...........................................................................................................................................................
cylinder
...........................................................................................................................................................
4- stir using glass rod until no more dissolves
...........................................................................................................................................................
5- filter using ******
6- take residue
...........................................................................................................................................................
7- wash
...........................................................................................................................................................
8- dry
...........................................................................................................................................................
...........................................................................................................................................................
Conclusion: the dry residue is
..................................................................................................................................................... [6]
© UCLES 2019
0971/62/O/N/19
[Turn over
8
4
Cobalt, manganese and nickel are metals. They react with dilute hydrochloric acid to form
hydrogen gas.
Plan an investigation to find the order of reactivity of these three metals.
You are provided with:
●● samples of each metal
●● dilute hydrochloric acid
●● common laboratory apparatus.
Your plan must make it clear how your investigation will be a fair test and how you will use your
results to place the metals in order of reactivity.
............................................................................................................................................................
polystyrene cup
conical flask
gas syringe
initial temp
10g cobalt
............................................................................................................................................................
10 g cobalt
100
cm3
HCl
record temp increase
............................................................................................................................................................
100 cm3 HCl
............................................................................................................................................................
............................................................................................................................................................
record time for 20 cm3 hydrogen
............................................................................................................................................................
arrange metals descendingly
............................................................................................................................................................
............................................................................................................................................................
SIMPLE CELL
displacement
cobalt + managanese nitrate
more reactive =
............................................................................................................................................................
color change
negative electrode
............................................................................................................................................................
............................................................................................................................................................
............................................................................................................................................................
...................................................................................................................................................... [6]
Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every
reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the
publisher will be pleased to make amends at the earliest possible opportunity.
To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge
Assessment International Education Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download
at www.cambridgeinternational.org after the live examination series.
Cambridge Assessment International Education is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of the University of
Cambridge Local Examinations Syndicate (UCLES), which itself is a department of the University of Cambridge.
© UCLES 2020
0620/61/M/J/20
9
4Brass is a mixture of two metals, copper and zinc.
opper does not react with dilute sulfuric acid. Zinc reacts with hot dilute sulfuric acid to form the
C
soluble salt zinc sulfate.
Plan an investigation to find the percentage by mass of zinc in a sample of brass.
In your answer you should include how to calculate the percentage by mass of zinc.
You have access to normal laboratory apparatus.
............................................................................................................................................................
1- 10g brass
2- add H2SO4 excess
............................................................................................................................................................
3- heat & stir glass rod
4- filter
............................................................................................................................................................
wash
dry
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............................................................................................................................................................
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...................................................................................................................................................... [6]
© UCLES 2020
0620/62/O/N/20
[Turn over
9
4
The label on a bottle of orange drink states ‘contains no artificial colours’.
A scientist thinks that the orange colour in the drink is a mixture of two artificial colours:
•
•
Sunset Yellow E110
Allura Red E129.
Plan an experiment to show that the orange colour in the drink does not contain these two artificial
colours.
Your plan should describe the use of common laboratory apparatus and samples of E110, E129
and the orange colouring from the drink.
You may draw a diagram to help answer the question.
if neither of E110 and E129 matches any of the food colouring
then
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...........................................................................................................................................................
...................................................................................................................................................... [6]
© UCLES 2020
0620/06/SP/23