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Chemistry Module 3 > Group 17 > Flashcards

Group 17 Flashcards

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1
Q

What halogens are gases at room temperature?

A

Fluorine

Chlorine

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2
Q

What halogen is a liquid at room temperature?

A

Bromine

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3
Q

What halogen is a solid at room temperature?

A

Iodine

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4
Q

What is the normal oxidation number of halogens in a molecule?

A

-1

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5
Q

What forces are between halogen molecules?

A

LDF

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6
Q

What happens to melting/boiling point as you go down the group?

A

Increases

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7
Q

Why does melting/boiling point increase as you go down the group?

A

More electrons, stronger instantaneous/induced dipoles, stronger LDF, more energy needed to break forces.

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8
Q

What increases down the group?

A

Boiling point
Atomic radius
Reactivity (reducing)

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9
Q

What decreases down the group?

A

Electronegativity

Reactivity (oxidising)

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10
Q

What is the colour of fluorine vapour?

A

Pale yellow

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11
Q

What is the colour of chlorine vapour?

A

Pale green

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12
Q

What is the colour of bromine vapour?

A

Orange

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13
Q

What is the colour of iodine vapour?

A

Purple

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14
Q

What is the colour of bromine liquid?

A

Dark red

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15
Q

What is the colour of iodine solid?

A

Shiny black

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16
Q

What is the colour of chlorine in water?

A

Colourless

17
Q

What is the colour of bromine in water?

A

Orange/yellow

18
Q

What is the colour of iodine in water?

A

Red

19
Q

What is the colour of chlorine in cyclohexane when shaken?

A

2 Colourless layers

20
Q

What is the colour of bromine in cyclohexane when shaken?

A

Top colourless bottom orange

Then orange top lighter bottom layer

21
Q

What is the colour of iodine in cyclohexane when shaken?

A

Top colourless bottom red

Then top purple/red bottom lighter red

22
Q

Observation when Chlorine water added to bromine ions in solution

A

Start colourless
End orange
With cyclohexane - Red

23
Q

Observation when Chlorine water added to iodine ions in solution

A

Start colourless
End orange
With cyclohexane - pink

24
Q

Observation when bromine water added to iodine ions in solution

A

Start colourless
End yellow
With cyclohexane - pink

25
Q

Inferences when Chlorine water is added to bromine ions in solution

A

Chlorine has displaced bromine as it is more reactive (reducing)
Cl2(aq) + 2Br-(aq) –> Br2(aq) + 2Cl-(aq)

26
Q

Inferences when Chlorine water is added to iodine ions in solution

A

Chlorine has displaced iodine as it is more reactive (reducing)
Cl2(aq) + 2I-(aq) –> I2(aq) + 2Cl-(aq)

27
Q

Inferences when bromine water is added to iodine ions in solution

A

Bromine has displaced iodine as it is more reactive (reducing)
Br2(aq) + 2I-(aq) –> I2(aq) + 2Br-(aq)

28
Q

Observations when adding silver nitrate solution to chloride ions

A

White precipitate forms

Cl- + Ag+ –> AgCl

29
Q

Effect of adding dilute ammonia to silver chloride precipitate

A

Dissolves

30
Q

Observations when adding silver nitrate solution to bromide ions

A

Cream precipitate forms

Br- + Ag+ –> AgBr

31
Q

Effect of adding dilute ammonia to silver bromide precipitate

A

Doesn’t dissolve

Conc ammonia would dissolve it

32
Q

Observations when adding silver nitrate solution to iodide ions

A

Yellow precipitate forms

I- + Ag+ –> AgI

33
Q

Effect of adding dilute ammonia to silver iodide precipitate

A

Doesn’t dissolve (even if conc ammonia is used)

34
Q

Do halogens conduct electricity?

A

No (No mobile charged particles)`

35
Q

Are halogens more soluble in hexane or water?

A

Hexane

36
Q

What is the structure/bonding of halogens?

A

Covalent bonds between atoms, LDF between molecules

Simple molecular structure

Chemistry Module 3 (6 decks)

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