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Chemistry
Advanced Subsidiary Question Leave
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Unit Test 1 1
Thursday 17 January 2008 ­ Morning 2

Time: 1 hour 3
4…

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Answer ALL questions. Write your answers in the spaces provided.

1. (a) Complete the electronic configuration of a copper atom and a bromide ion.

(i) Copper atom, Cu 1s22s22p63s23p6 ...................................................................
(1)

(ii) Bromide ion, Br­ 1s22s22p63s23p6 ...................................................................
(1)

(b) Define the term relative atomic mass.

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(d) Copper occurs naturally as the mineral malachite. The composition, by mass, of
malachite is as follows:
Cu = 57.5% C = 5.4% O = 36.2% H = 0.9%

(i) Calculate its empirical formula.




(2)

(ii) The molar mass of malachite is 221 g mol­1. Calculate its formula.…

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2. (a) Lithium chloride, potassium carbonate and sodium iodide can be distinguished using
flame tests. Complete the table below.


Formula Flame colour

lithium chloride LiCl

potassium carbonate K2CO3

sodium iodide NaI

(2)

(b) Explain the origin of the colours in the flame test.

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(d) Beryllium chloride, BeCl2, is covalent.

(i) Use ideas of ion polarisation or electronegativity to suggest why beryllium
chloride, a compound of a metal and a non-metal, is covalent rather than ionic.

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(2)

(ii) Draw a `dot and cross' diagram to…

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3. In hydrogen fluoride, HF, and water, H2O, the major intermolecular force is the hydrogen
bond.

(a) Draw a diagram to show the formation of hydrogen bonds between water molecules
in ice. Show at least three water molecules in your diagram and any relevant polarity
in the molecules.…

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(c) When hydrogen fluoride reacts with water it forms hydrogen ions. A lone pair of
electrons on the water molecule joins with the hydrogen ion, H+, to produce the ion
H3O+.

(i) Draw a diagram to show clearly the shape of the H3O+ ion.




(1)

(ii) Suggest an…

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4. (a) Explain the term reducing agent in terms of oxidation number change.

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(1)

(b) Write ionic half-equations (do not include state symbols) to show:

(i) chlorate(I) ions, ClO­, in acidic solution, being reduced to chlorine molecules
and water.

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(1)

(ii) chloride ions being…

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(e) Potassium chlorate, KClO3, decomposes on heating to give potassium chloride, KCl,
and oxygen, O2.

(i) Write the equation for this reaction. State symbols are not required.

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(1)

(ii) Show, by the use of oxidation numbers, why this is a redox reaction.

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5. (a) Cooking fuels and petrol for car engines need to be gases or liquids which vaporise
easily. This will be the case if the intermolecular forces are weak.

Two common fuels are methane, CH4, and 2,2,4-trimethylpentane, C8H18.

Electronegativity
carbon 2.1
hydrogen 2.5

(i) Explain the meaning of…

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