International A LevelChemistryEdexcelExam Questions5: Transition Metals and Organic Nitrogen Chemistry5.3 Transition Metal Reactions

Transition Metal Reactions (Edexcel International A Level Chemistry)

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5.3 Transition Metal Reactions

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5.3 Transition Metal Reactions

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16 marks

Describe the reactions of separate samples of aqueous cobalt(II) sulfate with aqueous sodium hydroxide, excess aqueous ammonia and concentrated hydrochloric acid.

For each reaction, link your description to an appropriate equation.
State symbols are not required.

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26 marks

Compare and contrast the mechanism of the action of platinum as a catalyst in the removal of pollutants from car engine exhaust fumes with that of vanadium(V) oxide as a catalyst in the Contact Process for the manufacture of sulfuric acid.

General definitions of catalysts are not required.

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1a7 marks

The diagram summarises some reactions of copper compounds.

q19-paper-5-jan-2021-edexcel-ial-chemistry

Identify, by name (including the oxidation state) or formula, the species in the sequence that contain copper.

P ......................................................
Q ......................................................
R ......................................................
S ......................................................
T ......................................................
V ......................................................
W ......................................................

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1b6 marks

T and V are the same type of chemical species.

i)
Name this type of chemical species.
(1)
ii)
Explain why T is coloured while V is colourless.

A detailed explanation of the fact that T is coloured is not required.
(3)
iii)
Suggest an explanation for the change of V into T on shaking.
(2)

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1c
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The reaction between copper(I) iodide and sulfuric acid is a disproportionation.

i)
Write the ionic equation for this disproportionation reaction.
State symbols are not required.
(1)
ii)
Show that the reaction in (c)(i) is thermodynamically feasible.
Use the standard electrode potentials of the relevant half-cells from the Data Booklet.
(2)

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1d
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The rare mineral mitscherlichite has the chemical formula K2CuCl4⦁nH2O.

4.26 g of mitscherlichite was dissolved in distilled water and the solution made up to 250.0 cm3. Excess potassium iodide solution was added to a 25.0 cm3 portion of this solution and the iodine formed was titrated against a solution of sodium thiosulfate with a concentration of 0.0500 mol dm−3.

This procedure was repeated until concordant results were obtained.
The mean accurate titre was 26.65 cm3.

The equations for the reactions are

   2 Cu to the power of 2 plus end exponent space plus space 4 straight I to the power of minus space rightwards arrow space 2 CuI space plus space straight I subscript 2 space 2 straight S subscript 2 straight O subscript 3 superscript 2 minus end superscript space plus space straight I subscript 2 space rightwards arrow space straight S subscript 4 straight O subscript 6 superscript 2 minus end superscript plus space 2 straight I to the power of minus

Calculate the value of n, the number of moles of water of crystallisation per mole of mitscherlichite.

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