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GSCE Chemistry > Halogen Displacements > Flashcards

Halogen Displacements Flashcards

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1
Q

what happens in a displacement reaction?

A

more reactive halogens can displace less reactive halogens from their compounds

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2
Q

what colour is the halogen chlorine (aq)?

A

colourless

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3
Q

what colour is halogen bromine (aq)?

A

yellow

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4
Q

what colour is the halogen iodine (aq)?

A

brown

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5
Q

what colour is the salt potassium chloride (KCl) (aq)?

A

colourless

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6
Q

what colour is the salt potassium bromide (KBr) (aq)?

A

colourless

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7
Q

what colour is the salt potassium iodide (KI) (aq)?

A

colourless

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8
Q

what reaction happens between KCl and Br2?

A

no change - stays yellow

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9
Q

what reaction happens between KCl and I2?

A

no change - stays brown

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10
Q

what reaction happens between KBr and Br2?

A

Cl2 + 2KBr -> Br2 + KCl
- chlorine displaces bromine
- colourless -> yellow

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11
Q

what reaction happens between KBr and I2?

A

no change - stays brown

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12
Q

what reaction happens between KI and I2?

A

Cl2 + 2Kl -> I2 + 2KCl
- chlorine displaces bromine
- colourless -> yellow

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13
Q

what reaction happens between KI and Br2?

A

Br2 + 2KI -> I2 + 2KBr
- bromine displaces iodine
- yellow -> brown

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14
Q

why does displacement occur?

A

because the halogen added is more reactive than the halogen present in the salt

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15
Q

what is the reactivity trend with iodine, chlorine and bromine?

A

chlorine > bromine > iodine

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16
Q

what determines the colour change in halogen displacements?

A

the halogens present - the salts are all colourless

17
Q

what happens to the colour of halogens when no change occurs in a reaction?

A

the colour of the halogen initially present remains

18
Q

what type of reaction is a halogen displacement reaction?

A

redox reaction

19
Q

what happens in a redox reaction?

A

the more reactive halogen atom steals an electron from the halide ion in the salt

20
Q

what is redox reaction short for?

A

REDuced an OXidised

GSCE Chemistry (49 decks)

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