ASChemistryCambridge (CIE)Exam Questions11. Group 17Physical Properties of the Group 17 Elements

Physical Properties of the Group 17 Elements (Cambridge (CIE) AS Chemistry): Exam Questions

Exam code: 9701

34 mins14 questions

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Physical Properties of the Group 17 Elements

1a
3 marks

The elements of Group 17 of the Periodic Table show trends in their properties.

i) Complete Table 2.1, stating the colour of each element in its state at room temperature.

[1]

Table 2.1

Halogen

Boiling point / °C

Colour

Chlorine

−36

Bromine

59

Iodine

184

ii) Explain why the boiling points of the halogens increase from chlorine to iodine.

[2]

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1b
1 mark

State the full electronic configuration for bromine.

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1c
3 marks

Explain why bromine is a liquid at room temperature, but fluorine and chlorine are gases.

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1d
2 marks

The bond enthalpy of the halogen molecules generally decreases down Group 17. Explain why the bond enthalpy of F2 is lower than that of Cl2.

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2a
3 marks

State the trend in volatility of chlorine, bromine and iodine. Explain your answer.

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2b
2 marks

Explain why Cl2 rather than Br2 would react more vigorously with a solution of I-.

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2c
2 marks

Astatine, At, is a member of Group 17.

Predict the physical state and colour of astatine at room temperature.

physical state:

colour:

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3a
3 marks

State and explain the trend in the boiling points of the halogens from fluorine to iodine.

trend:

explanation:

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3b
2 marks

The bond enthalpies of the halogens generally decrease down the group as shown in Table 3.1.

Table 3.1

Halogen

Bond enthalpy / kJ mol-1

F–F

159

Cl–Cl

242

Br–Br

193

I–I

151

State and explain the deviation in this trend.

deviation:

explanation:

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3c
2 marks

Chlorine is a strong oxidising agent.

Construct the simplest ionic equation for the reaction between chlorine and aqueous sodium iodide. State what is observed when this reaction occurs.

equation:

observation:

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