WCH0 QR Dynamic Papers Chemistry al Edexcel

Edexcel | Chemistry WCH0 | W 19 5 1 | 1 hour 45 minutes

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(a) (I)

1 Mark

This question is about compounds of copper.

(a) When copper(II) sulfate solution is mixed with potassium iodide solution,

the copper(II) ions are reduced. The products are a mixture of iodine and

potassium sulfate in solution, and a white precipitate of a copper compound.

(i) Write the ionic equation for the reaction of Cu (aq) and (aq) ions.

State symbols are not required.

(a) (II)

1 Mark

Complete the electronic configuration for the metal ion in the white precipitate.

........................

(a) (III)

1 Mark

Give the formula of a stable ion of an element in Period 4 of the Periodic Table,

which is isoelectronic with the metal ion in the white precipitate.

(b) (I)

1 Mark

Aqueous copper(II) sulfate contains the complex ion

State how the electronic energy levels of the copper(II) ion change when

water ligands form this complex.

(b) (II)

3 Mark s

Explain how this change in energy levels causes complex ions to have

different colours, depending on the ligand.

(b) (III)

1 Mark

State the shape of the ion

(b) (IV)

2 Mark s

ions react with the ligand 1,2-diaminoethane,

to produce a complex ion. All the water ligands are replaced and the

coordination number of copper does not change.

Draw the structure of this complex ion, making clear how the ligands form

bonds with the copper ions.

(b) (V)

2 Mark s

When excess concentrated hydrochloric acid is added to

complex is formed. Write the equation for this reaction and state the shape of the

complex ion formed.

Equation:

Shape of complex ion ..................................

(b) (VI)

3 Mark s

The reaction of ammonia with a solution containing ions takes

place in two steps.

Step 1: A few drops of ammonia are added

Step 2: An excess of ammonia is added to the products of Step 1.

Name the types of reaction occurring in the two steps and give the formula

of the copper complex ion in the final product.

Step 1 ...........................................................................................................................................

Step 2 ...........................................................................................................................................

Final product

(b) (VII)

2 Mark s

Describe what you would see in each of the two steps.

(b) (VIII)

3 Mark s

Explain, in terms of entropy, why the equilibrium constant for the overall

reaction of aqueous copper(II) ions with ammonia is less than the equilibrium

constant when aqueous copper(II) ions react with 1,2-diaminoethane.

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