Halogens Flashcards by Dicnu Unun | Brainscape

Q

Fluorine

A

Pale yellow gas

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Q

Chlorine

A

Pale green gas

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Q

Bromine

A

Brown-orange liquid

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Q

Iodine

A

Grey solid

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Q

Chlorine + AgNO3

A

White precipitate

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Q

Bromide + AgNO3

A

Cream precipitate

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Q

Iodide + AgNO3

A

Yellow precipitate

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Q

Cl + NH3

A

White precipitate dissolves in dilute NH3

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Q

Br + NH3

A

Cream precipitate dissolves in concentrated NH3

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Q

I + NH3

A

Yellow precipitate insoluble in concentrated NH3

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Q

Chlorine + sodium hydroxide

A

Sodium chlorite (I) - bleach

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Q

Use of sodium chlorate

A

Treating water

Cleaning agents

Bleaching paper and fabrics

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Q

Test for ammonium compounds

A

Add NaOH and heat

Ammonia gas will be produced if present

Use damp red litmus - NH4 will dissolve in water and turn litmus blue

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Q

Testing for ydroxides

A

Alkaline

Turn red litmus blue

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Q

Testing for carbonates

A

HCl reacts with carbonates to make CO2

When bubbled through limewater, turns cloudy

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Q

Testing for sulfates

A

Add HCl to remove carbonates

Add barium chloride

White precipitate formed

Q

Prevent false positives

A

Carbonates > sulfates > halides