Element	Formula of chloride	Type of bonding	Type of reaction with cold water
sodium	Table answer sodium_Formula of chloride	Table answer sodium_Type of bonding	Table answer sodium_Type of reaction with cold water
silicon	Table answer silicon_Formula of chloride	Table answer silicon_Type of bonding	Table answer silicon_Type of reaction with cold water

1(a)(ii)Period 3 Elements Oxides ChloridesMedium1 mark

Write an equation for the reaction of

P C l_{5}

with an excess of cold water.

Answer

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1(b)(i)Group 7 HalogensMedium1 mark

The reaction of chlorine with cold water is used in water purification.

Write an equation for the reaction of chlorine with cold water.

Answer

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1(b)(ii)Group 7 HalogensMedium1 mark

Explain the use of chlorine in water purification.

Answer

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1(c)(i)Group 7 HalogensEasy1 mark

The relative strength of

C l_{2}

B r_{2}

and

I_{2}

as oxidising agents can be compared by adding NaBr(aq) to separate samples of

C l_{2}

and

I_{2}

Describe the relative reactivity of

C l_{2}

B r_{2}

and

I_{2}

as oxidising agents.

Answer

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1(c)(ii)Group 7 HalogensHard3 marks

Complete Table 1.2 to describe the reactions of NaBr(aq) with separate samples of

C l_{2} (a q)

and

I_{2} (a q)

aqueous halogen	colour of aqueous halogen	appearance after NaBr(aq) is added	halide ions present in the mixture after the reaction
$C l_{2} (a q)$	pale green	Table answer r1_appearance after NaBr(aq) is added 0 words	Table answer r1_halide ions present in the mixture after the reaction 0 words
$I_{2} (a q)$	red-brown	Table answer r2_appearance after NaBr(aq) is added 0 words	Table answer r2_halide ions present in the mixture after the reaction 0 words

1(d)Group 7 HalogensMedium2 marks

Describe what is observed when

A g^{+} (a q)

, followed by

N H_{3} (a q)

, are added to a sample of NaI(aq).

Observation after addition of

A g^{+} (a q)

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Observation after addition of

N H_{3} (a q)

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