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A Level Chem > Halogens > Flashcards

Halogens Flashcards

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1
Q

Fluorine
Colour
Physical state at rt

A

Pale yellow

gas

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2
Q

Chlorine
Colour
Physical state at rt

A

Green

Gas

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3
Q

Bromine
Colour
Physical state at rt

A

Red-brown

Liquid

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4
Q

Iodine
Colour
Physical state at rt

A

Grey

Solid

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5
Q

Halogens get….. reactive going down

A

Less

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6
Q

Halogens displace

A

Less reactive halide ions from solution

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7
Q

When displacement reactions occur there is……

this can be made more obvious by

A

Colour changes

Shaking in organic solvent like hexane
Halide will dissolve in hexane. Settles as top layer

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8
Q

Cl2 + kcl

Start end

A

Start- both colourless

Aqueous- no reaction (colourless)

Organic solution- no reaction( colourless )

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9
Q

Kcl + br2

A

Start- yellow

Aqueous-no reaction ( yellow)

Organic solution -no reaction ( orange)

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10
Q

Kcl+ i2

A

Start-orange/brown

Aqueous-no reaction( orange/brown)

Organic-no reaction ( purple)

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11
Q

Kbr+ cl2

A

Start -colourless

Aqueous-Br2 (yellow)

Organic-br2( orange)

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12
Q

Kbr+br2

A

Start- yellow

Aqueous-no reaction ( yellow)

Organic - no reaction ( orange)

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13
Q

Kbr+i2

A

Start- orange/brown

Aqueous-no reaction( orange /brown)

Organic -no reaction ( purple)

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14
Q

Ki +cl2

A

Start-colourless

Aqueous-i2 (orange/brown)

Organic -i2(purple)

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15
Q

Ki+ br2

A

Start- yellow

Aqueous- i2 (orange/brown )

Organic -i2( purple)

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16
Q

Ki+i2

A

Start - orange/ brown

Aqueous-no reaction ( orange/ brown)

Organic- no reaction ( purple)

17
Q

3 stages for testing for halides

+ general equation

A

Add dilute nitric acid to remove and interfering ions

Add silver nitrate

Ag+. + x- = agx

Test with ammonia solution

18
Q

Results of testing for halides ( 2 parts)

A

Chloride-white precipitate- dissolves in dilute ammonia

Bromide-cream precipitate - dissolves in conc ammonia

Iodide- yellow precipitate- insoluble in conc ammonia

19
Q

Disproportionation

A

Simultaneously oxidised and reduced

A Level Chem (17 decks)

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