C10 - The halogens Flashcards by Milan Iwanowski

Q

How does electronegativity change down group 7

A

Decreases due to more shielding

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Q

How does boiling points change down the group

A

Increases due to more VDW’s

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Q

How does oxidising ability change in halogens

A

Decreases down the group

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Q

What is the reducing ability of halides

A

Iodide is the strongest, fluoride weakest

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Q

NaCl + H2SO4 ->

A

Steamy fumes of HCL

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Q

NaBr + H2SO4

A

Hbr and Fumes of Br2.

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Q

NaI + H2SO4 ->

A

HI, fumes of I2, sulfur, H2S gas

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Q

Test for halide ions involves

A

Acidified AgNO3

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Q

Why is acid used in the halide test

A

To remove carbonate or hydroxide ions

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Q

Positive halide test for Cl- with AGNO3 produces

A

White precipitate

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Q

Positive halide test for Br- with AGNO3 produces

A

Cream precipitate

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Q

Positive halide test for I- with AGNO3 produces

A

Yellow precipitate

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Q

Ammonia test + AgCl

A

Dissolves in dilute NH3

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Q

Ammonia test and AgBr

A

Dissolves in concentrated NH3

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Q

Ammonia test and AgI

A

AgI is insoluble

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Q

Reaction of chlorine and water

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A

Cl2 + H2O -> HClO + HCL

Q

Role of HCLO

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A

Weak bleach that kills bacteria

Q

Reaction of chlorine in sunlight

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A

Cl2 + H2O -> 2HCL + 0.5O2

Q

Reaction of chlorine and dilute cold NaOH

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A

Cl2 + 2NaOH -> NaCl + NaClO + H2O

Q

Why is chlorine added to drinking water despite being toxic

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A

Health benefits outweigh the risks