Unit 2 specimen paper

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Specimen Paper
Centre Number Candidate Number For Examiner's Use
Surname
Other Names
Examiner's Initials
Candidate Signature
Question Mark
General Certificate of Secondary Education
Higher Tier 1
2
Additional Science Chemistry 2H 3
Unit Chemistry C2 4
Chemistry
Unit Chemistry C2
H 5
6
7
8
For this paper you must have:
· a ruler
9
· the Data Sheet (as an insert). TOTAL
You may use a calculator.
Time allowed
! 60 minutes
Instructions
! Use black ink or black ball-point pen.
! Fill in the boxes at the top of this page.
! Answer all questions.
! You must answer the questions in the space provided. Do not
write outside the box around each page or on blank pages.
! Do all rough work in this book. Cross through any work you do
not want to be marked.
Information
! The marks for questions are shown in brackets.
! The maximum mark for this paper is 60.
! You are expected to use a calculator where appropriate.
! Question 3(a) should be answered in continuous prose. In this
question you will be marked on your ability to:
­ use good English
­ organise information clearly
­ use specialist vocabulary where appropriate.
Advice
· In all calculations, show clearly how you work out your answer.
GCSE Additional Science Chemistry 2 Specimen Paper Higher Tier V1.0

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Page 2

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Answer all questions in the spaces provided.
1 A student investigated the rate of reaction between marble and hydrochloric acid.
The student used an excess of marble.
The reaction can be represented by this equation:
CaCO3(s) + 2HCl(aq) CaCl2(aq) + H2O(l) + CO2(g)
The student used the apparatus shown in the diagram.
The student measured the mass of the flask and contents for ten minutes.
The results are shown on the graph.…read more

Page 3

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1 (a) (i) Complete the graph by drawing a line of best fit.
(1 mark)
1 (a) (ii) Use the graph to find the mass of the flask and contents after 1.8 minutes.
......................................... grams
(1 mark)
1 (a) (iii) The rate of reaction can be measured by the steepness of the graph line.
Describe, as fully as you can, how the rate of reaction changes with time in this
experiment.
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1 (c) A balance is used to measure the mass of the apparatus.
1 (c) (i) Which balance, A, B, or C, has the highest resolution?
The balance with the highest resolution is balance .
(1 mark)
1 (c) (ii) The balance used for this experiment should have a high resolution.
Explain why.
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(2 marks)
1 (d) The student repeated the experiment using powdered marble instead of marble chips.…read more

Page 5

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2 The diagram shows the main parts of an instrumental method called gas
chromatography linked to mass spectroscopy (GC-MS).
This method separates a mixture of compounds and then helps to identify each of the
compounds in the mixture.
2 (a) In which part of the apparatus:
2 (a) (i) is the mixture separated ....................................................................................................
(1 mark)
2 (a) (ii) is the relative molecular mass of each of the compounds in the mixture measured?
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Page 6

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2 (b) (i) Athletes sometimes take drugs because the drugs improve their performance. One of
these drugs is ephedrine.
Ephedrine has the formula:
C10H15NO
What relative molecular mass (Mr) would be recorded by GC-MS if ephedrine was
present in a blood sample taken from an athlete?
Show clearly how you work out your answer.
Relative atomic masses: H = 1; C = 12; N = 14; O = 16.
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Relative molecular mass = ..........................................…read more

Page 7

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2 (c) Athletes are regularly tested for drugs at international athletics events.
An instrumental method such as GC-MS is better than methods such as titration.
Suggest two reasons why.
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(2 marks)
2 (d) When a blood sample is taken from an athlete the sample is often split into two portions.
Each portion is tested at a different laboratory.
Suggest why.
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3 Read the information in the box and then answer the question.
Aluminium is made by the electrolysis of aluminium oxide.
Aluminium oxide is an ionic compound containing aluminium ions (Al3+) and oxide ions
(O2­).
The diagram below shows the apparatus used to electrolyse aluminium oxide.
3 (a) In this question you will be assessed on using good English, organising information
clearly and using specialist terms where appropriate.…read more

Page 9

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3 (b) Aluminium is a metal.
Explain why aluminium conducts electricity.
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(2 marks)
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4 Waste water from some industrial processes contains metal ions, such as chromium
ions. These metal ions must be removed from the water before the water is returned to a
river.
4 (a) A method of removing chromium ions (Cr3+) from water is represented by this equation.
Balance the equation.
Cr3+(aq) + ...........…read more

Page 10

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5 Ammonia has the formula NH3
The diagrams show how electrons are arranged in nitrogen and hydrogen atoms.
5 (a) Draw a diagram to show how the electrons are arranged in an ammonia molecule.
You need only show the electrons in the highest energy level.
(2 marks)
5 (b) Ammonia is a gas at room temperature.
Explain why ammonia has a low boiling point.
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