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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  • Created on: 05-04-11 17:50

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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…

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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…

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(e) 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…

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2 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.…

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(b) 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…

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3 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,…

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(c) 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…

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4 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…

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(c) 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…

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5 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…

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