OCR Chemistry A January 2011 Question Paper [F321]

Question paper for January 2011, chemistry specification a for ocr. Ignore markings in margin, just for personal use. Especially useful if resiting. Mark Scheme: http://getrevising.co.uk/resources/ocr_chemistry_a_january_2011_mark_scheme_f321

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Preview of OCR Chemistry A January 2011 Question Paper [F321]

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ADVANCED SUBSIDIARY GCE
CHEMISTRY A F321
Atoms, Bonds and Groups
Thursday 13 January 2011
* O C E / 2 5 7 5 7 *
Candidates answer on the question paper.
OCR supplied materials:
Morning
· Data Sheet for Chemistry A (inserted)
Duration: 1 hour
Other materials required:
· Scientific calculator
* F 3 2 1 *
INSTRUCTIONS TO CANDIDATES
· The insert will be found in the centre of this document.
· Write your name, centre number and candidate number in the boxes above. Please write clearly
and in capital letters.
· Use black ink. Pencil may be used for graphs and diagrams only.
· Read each question carefully. Make sure you know what you have to do before starting your answer.
· Write your answer to each question in the space provided. Additional paper may be used if
necessary but you must clearly show your candidate number, centre number and question number(s).
· Answer all the questions.
· Do not write in the bar codes.
INFORMATION FOR CANDIDATES
· The number of marks is given in brackets [ ] at the end of each question or part question.
· Where you see this icon you will be awarded marks for the quality of written
communication in your answer.
This means for example you should:
· ensure that text is legible and that spelling, punctuation and grammar are accurate so that
meaning is clear;
· organise information clearly and coherently, using specialist vocabulary when appropriate.
· You may use a scientific calculator.
· A copy of the Data Sheet for Chemistry A is provided as an insert with this question paper.
· You are advised to show all the steps in any calculations.
· The total number of marks for this paper is 60.
· This document consists of 12 pages. Any blank pages are indicated.
© OCR 2011 [D/500/7833] OCR is an exempt Charity
DC (NF) 25757/1 Turn over

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Page 2

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Answer all the questions.
1 Sir Humphrey Davy, the inventor of the miners' safety lamp, was the first person to isolate the
element strontium. Robert Bunsen, the inventor of the Bunsen burner, was partly responsible for
the discovery of the element rubidium. Rubidium and strontium occur next to each other in the
Periodic Table.
A sample of rubidium was analysed and found to consist of two isotopes, rubidium-85 and
rubidium-87. Information about these isotopes is given in the table.…read more

Page 3

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Ionisation energies allow chemists to determine electron structures. The first two ionisation
energies of rubidium and strontium are shown in the table.
first ionisation energy second ionisation energy
element
/ kJ mol­1 / kJ mol­1
rubidium 403 2632
strontium 550 1064
(i) Write an equation to represent the second ionisation energy of strontium.
Include state symbols.
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Page 4

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Sodium tartrate and copper(II) nitrate are both salts.
(a) Sodium tartrate is a salt of tartaric acid. The formula of tartaric acid can be represented as
Hx A. In this formula, x is the number of H+ ions that can be replaced by metal ions to form
salts.
A student carries out a titration to find the value of x in the formula of tartaric acid, Hx A.
In the titration, 25.00 cm3 of 0.0500 mol dm­3 tartaric acid, Hx A, exactly reacts with 12.…read more

Page 5

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Copper(II) nitrate is a salt of nitric acid.
(i) A student prepares a solution of copper(II) nitrate, Cu(NO3)2, by adding, with stirring, an
excess of copper(II) oxide to some hot dilute nitric acid.
Construct the equation for this reaction.
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(ii) Copper(II) nitrate has ionic bonding.
What is meant by the term ionic bonding ?
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(iii) Explain why a solution of copper(II) nitrate conducts electricity.
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(iv) What is the oxidation number of nitrogen in Cu(NO3)2?
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Page 6

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Linus Pauling was a Nobel prize winning chemist who devised a scale of electronegativity.
Some Pauling electronegativity values are shown in the table.
element electronegativity
B 2.0
Br 2.8
N 3.0
F 4.0
(a) What is meant by the term electronegativity?
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(b) Show, using + and ­ symbols, the permanent dipoles on each of the following bonds.…read more

Page 7

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Boron trifluoride, BF3, ammonia, NH3, and sulfur hexafluoride, SF6, are all covalent
compounds. The shapes of their molecules are different.
(i) State the shape of a molecule of SF6.
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(ii) Using outer electron shells only, draw `dot-and-cross' diagrams for molecules of BF3 and
NH3.
Use your diagrams to explain why a molecule of BF3 has bond angles of 120° and NH3
has bond angles of 107°.
BF3 NH3
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Page 8

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Calcium hydroxide is used in agriculture but the amounts used must be carefully controlled.
(a) State one use of calcium hydroxide in agriculture and suggest why the amount of calcium
hydroxide used should not be excessive.
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(b) A student knew that calcium hydroxide could be made by adding calcium to water.
The student added 0.00131 mol of calcium to a beaker containing about 100 cm3 of water.
A reaction took place as shown by the equation below.…read more

Page 9

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The student repeated the experiment using the same mass of pure barium.
The student found that a smaller volume of hydrogen gas was produced, measured at RTP.
(i) Explain why.
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(ii) Suggest one other difference the student would observe between the reactions of water
with calcium and of water with barium.
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Page 10

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Chlorine, bromine and iodine are halogens commonly used in school and college experiments.
(a) Halogens have van der Waals' forces between their molecules.
(i) Describe how van der Waals' forces arise.
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(ii) State and explain the trend in the boiling points of chlorine, bromine and iodine.
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(b) The halogen astatine does not exist in large enough quantities to observe any of its
reactions.…read more

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