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Chemistry > 4.2.1 Group 7 elements > Flashcards

4.2.1 Group 7 elements Flashcards

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1
Q

What is the structure and bonding of halogens?

A

Halogens have simple structures that are covalently bonded.

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2
Q

What are properties of halogens?

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

What is the colour of pure fluorine?

A

Pale yellow

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4
Q

What is the colour of aqueous fluorine?

A

N/A insoluble in water

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5
Q

What is the colour of pure chlorine?

A

Pale green

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6
Q

What is the colour of aqueous chlorine?

A

Colourless

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7
Q

What is the colour of pure bromine?

A

Brown

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8
Q

What is the colour of aqueous bromine?

A

Yellow/orange

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9
Q

What is the colour of pure iodine?

A

Dark grey

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10
Q

What is the colour of aqueous iodine?

A

Brown

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11
Q

Estimate the colour of pure astatine.

A

Black

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12
Q

What is the state of fluorine?

A

Gas

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13
Q

What is the state of chlorine?

A

Gas

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14
Q

What is the state of bromine?

A

Liquid

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15
Q

What is the state of iodine?

A

Solid

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16
Q

What is the state of astatine?

A

Solid

17
Q

What are other properties of bromine?

A

Volatile, releases brown fumes

18
Q

What are other properties of iodine?

A

Sublimes, releases purple fumes

19
Q

What forms when halogens react with metals?

A

Ionic compounds

20
Q

When halogens react with metals to form ionic compounds, they change from halogens to…

A

…halides.

21
Q

True or false: Halogens get more reactive down the group.

A

False: they get less reactive

22
Q

Why do halogens get less reactive down the group?

A

Atoms have more electron shells, so the extra electron is further from the nucleus, so its attraction to the nucleus is weaker, making it harder for the atom to gain the extra electron.

23
Q

What is the chemical test for chlorine?

A

Damp blue litmus paper turns white. This is because chlorine acts as a bleaching agent, so it removes the colour from the paper.

Chemistry (51 decks)

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