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Chemistry > Group 7 > Flashcards

Group 7 Flashcards

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1
Q

What is fluorines appearance in water and non polar solvent

A

Colourless

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2
Q

What is chlorines appearance in water and non polar solvent?

A

Very pale green solution

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3
Q

What is the appearance of all the halide ions?

A

White solid or colourless solution

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4
Q

What is the atomic radius going down group 7

A

Increases-extra shell of electrons

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5
Q

What is the natural state of bromine?

A

Orange liquid

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6
Q

What happens to the melting point as you descend group 7?

A

Increases-more energy needed to overcome the stronger Van Der Waals forces due to the increase of electrons

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7
Q

What is the natural state of chlorine?

A

Pale yellow gas

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8
Q

What is iodines appearance in water and non polar solvent

A

W-brown solution

NPS - purple solution

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9
Q

What happens to the electronegativity of the elements descending g7

A

Decreases-bigger atomic radius and more shielding between nucleus and outer shell. There’s a weaker attraction between nucleus and the bonded electrons

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10
Q

What is bromines appearance in water and non polar solvent?

A

Orange solution

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11
Q

What happens to the reactivity of group 7 going down?

A

Decreases- going down the group the atoms are larger with more shielding between nucleus and outershell electrons
Weaker attraction between nucleus and electron being gain

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12
Q

Which is the most powerful oxidising agents

A

Fluorine

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13
Q

What is the most powerful reducing agent?

A

Iodine

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14
Q

What is the natural state of iodine?

A

Black solid

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15
Q

What does fluorine displace?

A

Cl Br I

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16
Q

What does cl displace

A

Br I

17
Q

What does bromine displace?

A

I

18
Q

What does I displace

A

Fuck all

19
Q

How does cl2 react with water?

A

Cl2(g)+h20(l)—–>Hcl(aq)+HClo(aq)

Chloric (I) acid

20
Q

Why is cl2 used in water?

A

Kills bacteria

21
Q

Why do some people appose using cl2 in water?

A

If you add too much it becomes toxic and leaves traces of chlorinated hydrocarbons

22
Q

What happens when you add dilute sodium hydroxide to chlorine?

A 
Cl2(g)+2NaOH(aq)---> nacl(aq)+Naclo(aq)+H2O(l)
Sodium chlorate (I)
23
Q

What happens when cl2 reacts with hot concentrated NaOH

A

6NaOH+3Cl2—> naclo3 + 5Nacl + 3H20

24
Q

What happens to Cl- reacts with silver nitrate?

A

Silver chloride white precipitate

25
Q

What happens to silver chloride when dilute NH3 is added

A

Precipitate dissolves

26
Q

What happens when silver nitrate is added to Br-

A

Silver bromide cream precipitate

27
Q

What happens when you add dilute NH3 to silver bromide?

A

Precipitate doesn’t dissolve

28
Q

What happens when concentrated NH3 is added to silver bromide?

A

Precipitate dissolves

29
Q

What happens when you add silver nitrate to iodine?

A

Silver iodide yellow precipitate

30
Q

What happens when you add dilute or concentrated NH3 to silver iodide?

A

Precipitate doesn’t dissolve

31
Q

What is the natural state of fluorine?

A

Colourless gas

Chemistry (15 decks)

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