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Chemistry > 4.3 Group 7 Halogens > Flashcards

4.3 Group 7 Halogens Flashcards

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1
Q

What are halogen?

A

Group 7 elements which are all covalently bonded, simple molecular substance

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2
Q

What are the trend in properties?

A
  • All diatomic
  • Colours get darker going down the group
  • MP/BP increases going down the group
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3
Q

What colour is fluorine?

A

Very pale yellow

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4
Q

What colour is chlorine?

A

Pale green

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5
Q

What colour is bromine?

A

Brown

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6
Q

What colour is iodine?

A

Dark grey

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7
Q

What colour is astatine?

A

Black

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8
Q

What happens when reacted with metals?

A

Ionic compounds formed

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9
Q

What is the reactivity trend in halogens?

A

Less reactive going down

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10
Q

Why do halogens get less reactive going down?

A
  • Atoms have more electron shells
  • The extra electron is further from the nucleus
  • The attraction to the nucleus is weaker
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11
Q

What is the chemical test for chlorine?

A

Damp blue litmus paper turns white

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12
Q

Why does chlorine turn blue litmus paper white?

A

Bleaching agent

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13
Q

What can be observed in a hydrogen + chloride reaction?

A

Colour change, green to colourless

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14
Q

What is Hydrogen Chloride?

A
  • Covalently bonded
  • Simple molecular substance
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15
Q

Why is Hydrogen chloride a gas?

A

Has a low boiling point due to weak IMFs

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16
Q

What is a displacement reaction?

A

When more reactive halogens can displace less reactive halogens from their compounds

17
Q

What colour is the halogen Cl2 in a displacement reaction?

A

Colourless

18
Q

What colour is the halogen Br2 in a displacement reaction?

A

Yellow

19
Q

What colour is the halogen I2 in a displacement reaction?

A

Brown

20
Q

What type of reaction is a halogen displacement reaction?

A

Redox

21
Q

What does the more reactive halogen do in a halogen displacement reaction?

A

Steal an electron from the hailed ion in the salt

22
Q

What is produced when hydrogen reacts with chlorine?

A

Hydrogen chloride

23
Q

What colour is the salt KCl?

A

Colourless

24
Q

What colour is the salt KBr?

A

Colourless

25
Q

What colour is the salt KI?

A

Colourless

26
Q

What is the reactivity trend in halogen displacements?

A

Chloride > Bromine > Iodine

27
Q

What type of reaction are halogen displacements?

A

Redox reactions

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