6 ch02 01_que_20110120 chem pp

N37963A
©2011 Edexcel Limited.
7/7/5/2/
*N37963A0124*
Instructions
• Use black ink or ball-point pen.
• Fill in the boxes at the top of this page with your name,
centre number and candidate number.
• Answer all questions.
• Answer the questions in the spaces provided
– there may be more space than you need.
Information
• The total mark for this paper is 80.
• The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• Questions labelled with an asterisk (*) are ones where the quality of your
written communication will be assessed
– you should take particular care with your spelling, punctuation and grammar, as
well as the clarity of expression, on these questions.
• A Periodic Table is printed on the back cover of this paper.
Advice
• Read each question carefully before you start to answer it.
• Keep an eye on the time.
• Try to answer every question.
• Check your answers if you have time at the end.
Turn over
Edexcel GCE
Chemistry
Advanced Subsidiary
Unit 2: Application of Core Principles of Chemistry
Candidates may use a calculator.
Centre Number Candidate Number
Write your name here
Surname Other names
Total Marks
6CH02/01
Paper ReferenceThursday 20 January 2011 – Afternoon
Time: 1 hour 30 minutes

2
*N37963A0224*
SECTION A
Answer ALL the questions in this section. You should aim to spend no more than 20 minutes on
this section. For each question, select one answer from A to D and put a cross in the box .
If you change your mind, put a line through the box and then mark your new answer with
a cross .
1 The equation for the reaction between limewater and hydrochloric acid, including state
symbols, is
A CaOH(s) + HCl(aq) CaCl(aq) + H2O(l)
B Ca(OH)2(s) + 2HCl(aq) CaCl2(aq) + 2H2O(aq)
C CaOH(aq) + HCl(aq) CaCl(aq) + H2O(aq)
D Ca(OH)2(aq) + 2HCl(aq) CaCl2(aq) + 2H2O(l)
(Total for Question 1 = 1 mark)
2 As you go down Group 2 of the Periodic Table, which of the following decreases?
A The reactivity of the elements.
B The solubility of the hydroxides of the elements.
C The solubility of the sulfates of the elements.
D The thermal stability of the carbonates of the elements.
3 Which concentrated acid would be best for mixing with a salt to carry out a flame test?
A Hydrochloric acid
B Nitric acid
C Phosphoric(V) acid
D Sulfuric acid
4 The flame produced by a compound containing barium in a flame test is
A colourless.
B green.
C red.
D yellow.

3
*N37963A0324* Turn over
5 Which of the following is a greenhouse gas?
A Argon
B Nitrogen
C Oxygen
D Water vapour
6 For parts (a) and (b), use your knowledge of intermolecular forces to predict the
compound with the highest boiling temperature.
(a) A HF
B H2O
C NH3
D CH4
(1)
(b) A 1-iodobutane
B 1-chlorobutane
C 2-methyl-2-iodopropane
D 2-methyl-2-chloropropane
(1)
(Total for Question 6 = 2 marks)
Use this space for any rough working. Anything you write in this space will gain no credit.

4
*N37963A0424*
7 Consider the following organic liquids:
A ethanal
B ethanol
C tetrachloromethane
D trichloromethane
(a) Each liquid is run from a burette. Which liquid would not be deflected significantly
by a charged rod?
(1)
A
B
C
D
(b) Which liquid would react with phosphorus(V) chloride to give a gas which fumes in
moist air?
(1)
A
B
C
D
(c) Which liquid would you expect to have the peak at the greatest mass/charge ratio in
its mass spectrum?
(1)
A
B
C
D
(d) Which liquid has an infrared spectrum with a broad absorption due to hydrogen
bonding?
(1)
A
B
C
D

5
8 Which of the following best defines the meaning of the term anthropogenic change?
It is a change caused by
A nature.
B plants.
C animals.
D humans.
9 Which of the following equations represents the change when concentrated sulfuric acid
is added to solid potassium chloride at room temperature?
A 8KCl + 5H2SO4 4K2SO4 + H2S + 4Cl2 + 4H2O
B 2KCl + 3H2SO4 2KHSO4 + SO2 + Cl2 + 2H2O
C 6KCl + 4H2SO4 3K2SO4 + S + 3Cl2 + 4H2O
D KCl + H2SO4 KHSO4 + HCl
10 The Maxwell-Boltzmann distribution of molecular energies is useful for explaining why
increasing temperature affects the rate of a chemical reaction.
(a) Which of the following statements describes how the shape of the Maxwell-
Boltzmann distribution curve changes as temperature increases?
(1)
A The peak decreases in height and moves to the left.
B The peak increases in height and moves to the left.
C The peak decreases in height and moves to the right.
D The peak increases in height and moves to the right.
(b) The main reason that reaction rates increase with temperature is that
(1)
A all the molecules move faster.
B all the molecules collide more frequently.
C more molecules collide with the correct orientation.
D a larger proportion of molecules have high energies.

6
*N37963A0624*
11 Four organic reactions are given below:
A CH3CH3 CH2 CH2 + H2
B nCH2 CH2 ( CH2 CH2 ) n
C CH2 CH2 + HBr CH3CH2Br
D CH3CH2Br + H2O CH3CH2OH + HBr
(a) Which reaction is a substitution reaction?
(1)
A
B
C
D
(b) Which reaction is an electrophilic addition reaction?
(1)
A
B
C
D
(c) Which reaction involves initial attack by a nucleophile?
(1)
A
B
C
D
(d) Which reaction requires an initiator?
(1)
A
B
C
D

7
12 Which of the following statements is true?
A CFCs and nitrogen monoxide, NO, are involved in the depletion of the ozone
layer.
B CFCs act as catalysts for the depletion of the ozone layer, while nitrogen
monoxide, NO, does not.
C CFCs and ozone are free radicals.
D CFCs and nitrogen monoxide, NO, are decomposed by UV radiation.
TOTAL FOR SECTION A = 20 MARKS

9
SECTION B
Answer ALL the questions. Write your answers in the spaces provided.
13 This question is about iodine and its compounds.
(a) (i) The element iodine can be obtained from seaweed. One step in the procedure
is to extract the iodine from aqueous solution by shaking with a hydrocarbon
solvent in a separating funnel.
Draw a diagram of a separating funnel containing the separated layers. Label
the hydrocarbon layer, and state its colour.
[Density of hydrocarbon layer 0.660 g cm–3
]
(3)
Diagram
Colour of hydrocarbon layer ............................................................................................................................................................................
(ii) Iodine is also formed when an aqueous solution containing iodide ions reacts
with an aqueous solution of iron(III) ions.
Write the ionic equation for this reaction. State symbols are not required.
(1)

10
*N37963A01024*
(b) Hydrogen iodide gas is usually prepared by adding phosphoric(V) acid to solid
potassium iodide.
(i) Suggest why phosphoric(V) acid is used in this preparation rather than
concentrated sulfuric acid.
(1)
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
(ii) Describe what you would see if a test tube of hydrogen iodide gas was inverted
in a beaker of water.
(1)
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
(iii) When hydrogen iodide gas reacts with ammonia, dense white fumes form.
Write the equation for this reaction, including state symbols.
(2)

11
(c) 1-iodobutane can be made by reacting butan-1-ol with phosphorus(III) iodide, PI3,
formed by reacting moist red phosphorus with iodine.
(i) Complete the following equation for the formation of 1-iodobutane.
(1)
PI3 + …............… C4H9OH
(ii) Identify the intermolecular forces present between molecules of 1-iodobutane.
(1)
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
(iii) 1-iodobutane reacts with hot aqueous silver nitrate solution. Describe what you
would see when this reaction takes place.
(1)
................................................................................................................................................................................................................................................
(iv) Give the structural formula for the organic product of the reaction between
1-iodobutane and ammonia.
(1)

13
14 This question is about methanol, CH3OH, and ethanol, CH3CH2OH.
(a) (i) Draw a dot and cross diagram for methanol, showing outer electrons only.
(1)
(ii) Give the approximate values for the HCH and COH bond angles in methanol.
Justify your answers.
(4)
HCH angle .................................
Justification ..................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
COH angle .................................
Justification ..................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
(iii) Using displayed formulae, draw a diagram to show a hydrogen bond between
two methanol molecules. On your diagram, show the bond angle around the
hydrogen atom of the hydrogen bond and give its value.
(2)

14
*N37963A01424*
(b) Methanol reacts with sodium.
(i) State what you would observe in this reaction.
(2)
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
(ii) Write the equation for this reaction. State symbols are not required.
(1)
(c) Ethanol can be used to make ethanal.
(i) Identify, by name or formula, the two chemicals you would use to make ethanal
from ethanol in the laboratory.
(2)
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................

15
(ii) Draw a diagram of the apparatus you would use to prepare ethanal from ethanol
in the laboratory and collect the product.
(2)
(iii) Both ethanal and propane have a molar mass of 44 g mol–1
, but their boiling
temperatures are different.
Suggest which substance has the higher boiling temperature. Justify your
answer by comparing the intermolecular forces in each compound.
(2)
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17
15 The ingredients list on the label of a commercial indigestion remedy states that each
tablet contains 680 mg of calcium carbonate.
To check this, the following experiment was carried out.
One tablet was crushed. 50.0 cm3
of 1.00 mol dm–3
hydrochloric acid, an excess, was
then added and the mixture was transferred to a volumetric flask. The volume was made
up to exactly 100 cm3
with distilled water. 10.0 cm3
of this solution was titrated with
0.300 mol dm–3
sodium hydroxide solution. The following results were obtained.
Run Rough 1 2
Final burette
reading / cm3 21.80 33.20 44.40
Initial burette
reading / cm3 10.00 21.80 33.20
Volume added
/ cm3 11.80 11.40 11.20
(a) (i) What should be used to crush the tablet?
(1)
................................................................................................................................................................................................................................................
(ii) Name a suitable indicator for the titration. State the colour change you would
expect to see.
(2)
Indicator .........................................................................................................................................................................................................................
Colour change from ............................................................................................ to .............................................................................................

18
*N37963A01824*
(b) (i) Select appropriate readings and calculate the mean titre.
(1)
(ii) Calculate the number of moles of sodium hydroxide used.
(1)
(iii) Use your answer to (ii) to write down the number of moles of hydrochloric acid
left in 10.0 cm3
of the solution used in the titration.
(1)
(iv) Calculate the number of moles of hydrochloric acid left in 100 cm3
of solution.
(1)

19
(v) 50.0 cm3
of 1.00 mol dm–3
hydrochloric acid contains 0.0500 mol of
hydrochloric acid.
Use this and your answer to (iv) to calculate the number of moles of
hydrochloric acid that reacted with the indigestion tablet.
(1)
(vi) The equation for the reaction between hydrochloric acid and calcium carbonate
is:
CaCO3(s) + 2HCl(aq) CaCl2(aq) + CO2(g) + H2O(l)
Use this, and your answer to (v), to calculate the number of moles of calcium
carbonate in one tablet.
(1)
(vii) Calculate the mass of calcium carbonate in one tablet.
[Assume that the molar mass of CaCO3 is 100 g mol–1
]
(1)
(viii)Suggest a reason, other than experimental error, why your value differs from the
value given on the label.
(1)
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
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TOTAL FOR SECTION B = 39 MARKS

21
SECTION C
Answer ALL the questions. Write your answers in the spaces provided.
16 This question is about some reactions which can be used in the manufacture of hydrogen.
Reaction 1 uses two naturally occurring chemicals, water and natural gas. Steam is
reacted with methane to form carbon monoxide and hydrogen in an equilibrium reaction.
Reaction 1 CH4(g) + H2O(g) CO(g) + 3H2(g) H = +210 kJ mol–1
In reaction 2, carbon monoxide and steam are passed over copper at high temperature.
This forms carbon dioxide and hydrogen.
Reaction 2 CO(g) + H2O(g) CO2(g) + H2(g)
The carbon dioxide formed is removed by passing it through potassium carbonate
solution in reaction 3.
Reaction 3 K2CO3(aq) + CO2(g) + H2O(l) 2KHCO3(aq)
The potassium carbonate is regenerated by heating the potassium hydrogencarbonate
solution in reaction 4. The carbon dioxide gas produced is released into the atmosphere.
Reaction 4 2KHCO3(aq) K2CO3(aq) + CO2(g) + H2O(l)
(a) For each of the first three reactions, state the initial and final oxidation numbers of
any elements that change their oxidation numbers. Hence decide which are redox
reactions.
(5)
Reaction 1 ..................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
Reaction 2 ....................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
Reaction 3 ....................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................

22
*N37963A02224*
*(b) (i) Discuss, with reasons, the conditions of temperature and pressure that would
favour the production of hydrogen in reaction 1. You should consider the effect
of the conditions on both yield and rate.
(7)
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................................................................................................................................................................................................................................................
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................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
(ii) Excess steam is used in reaction 1. State why an excess of a reagent is used
and suggest why steam, rather than methane, is chosen.
(2)
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................

23
*N37963A02324*
(c) Copper is a catalyst in reaction 2. Explain how a catalyst increases the rate of a
reaction.
(2)
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
(d) (i) State one economic advantage of reaction 4.
(1)
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
*(ii) Reaction 4 contributes to global warming. Identify the substance formed in this
reaction which is likely to be responsible and explain the processes that lead to
an increase in global temperatures.
Suggest two effects an increase in global temperatures might have on the
environment.
(4)
................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................
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TOTAL FOR SECTION C = 21 MARKS
TOTAL FOR PAPER = 80 MARKS

6 ch02 01_que_20110120 chem pp

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