Chemistry 9701/41 — May/June 2014

Cambridge A-Level · A Level Structured Questions · worked solutions for every part, with the mark scheme

questions

100

marks

120

minutes

Topics Introduction to A Level Organic Chemistry · Nitrogen Compounds · Carboxylic Acids and Derivatives · Transition Elements · Electrochemistry · Chemical Energetics · +4 more

Q1Transition ElementsElectrochemistryFree sample

(a)

(i)

State how the melting point and density of iron compare to those of calcium.

melting point of iron:

density of iron:

(ii)

Explain why these differences occur.

melting point:

density:

(b)

The following diagram shows the apparatus used to measure the standard electrode potential, $E^\ominus$ , of a cell composed of a Cu(II)/Cu electrode and an Fe(II)/Fe electrode.

Fig. 1.1

(i)

Finish the diagram by adding components to show the complete circuit. Label the components you add.

(ii)

In the spaces below, identify or describe what the four letters A-D represent.

(iii)

Use the Data Booklet to calculate the $E^\ominus$ for this cell.

(iv)

Predict how the size of the overall cell potential would change, if at all, as the concentration of solution C is increased.
Explain your reasoning.

(c)

The iron(II) complex ferrous bisglycinate hydrochloride is sometimes prescribed, in capsule form, to treat iron deficiency or anaemia.

A capsule containing 500 mg of this iron(II) complex was dissolved in dilute $\text{H}_2\text{SO}_4$ and titrated with 0.0200 mol dm⁻³ $\text{KMnO}_4$ .

18.1 cm³ of $\text{KMnO}_4$ solution were required to reach the end point.

The equation for the titration reaction is as follows.

5\text{Fe}^{2+} + \text{MnO}_4^- + 8\text{H}^+ \rightarrow 5\text{Fe}^{3+} + \text{Mn}^{2+} + 4\text{H}_2\text{O}

(i)

Describe how you would recognise the end point of this titration.

(ii)

Calculate

the number of moles of $\text{Fe}^{2+}$ in the capsule,
the mass of iron in the capsule,
the molar mass of the iron(II) complex, assuming 1 mol of the complex contains 1 mol of iron.

The rest of this paper

7 more questions

Q2Transition Elements · Chemical Energetics16M
Q3Nitrogen Compounds · Introduction to A Level Organic Chemistry · Carboxylic Acids and Derivatives · Equilibria16M
Q4Introduction to A Level Organic Chemistry · Organic Synthesis · Hydroxy Compounds · Nitrogen Compounds · Carboxylic Acids and Derivatives14M
Q5Introduction to A Level Organic Chemistry8M
Q6Nitrogen Compounds10M
Q7Analytical Techniques · Introduction to A Level Organic Chemistry11M
Q8Carboxylic Acids and Derivatives · Introduction to A Level Organic Chemistry9M

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