Group 17

Question 1

What halogens are gases at room temperature?

Answer 1

Fluorine

Chlorine

Question 2

What halogen is a liquid at room temperature?

Answer 2

Bromine

Question 3

What halogen is a solid at room temperature?

Answer 3

Iodine

Question 4

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

Answer 4

-1

Question 5

What forces are between halogen molecules?

Answer 5

LDF

Question 6

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

Answer 6

Increases

Question 7

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

Answer 7

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

Question 8

What increases down the group?

Answer 8

Boiling point
Atomic radius
Reactivity (reducing)

Question 9

What decreases down the group?

Answer 9

Electronegativity

Reactivity (oxidising)

Question 10

What is the colour of fluorine vapour?

Answer 10

Pale yellow

Question 11

What is the colour of chlorine vapour?

Answer 11

Pale green

Question 12

What is the colour of bromine vapour?

Answer 12

Orange

Question 13

What is the colour of iodine vapour?

Answer 13

Purple

Question 14

What is the colour of bromine liquid?

Answer 14

Dark red

Question 15

What is the colour of iodine solid?

Answer 15

Shiny black

Question 16

What is the colour of chlorine in water?

Answer 16

Colourless

Question 17

What is the colour of bromine in water?

Answer 17

Orange/yellow

Question 18

What is the colour of iodine in water?

Answer 18

Red

Question 19

What is the colour of chlorine in cyclohexane when shaken?

Answer 19

2 Colourless layers

Question 20

What is the colour of bromine in cyclohexane when shaken?

Answer 20

Top colourless bottom orange

Then orange top lighter bottom layer

Question 21

What is the colour of iodine in cyclohexane when shaken?

Answer 21

Top colourless bottom red

Then top purple/red bottom lighter red

Question 22

Observation when Chlorine water added to bromine ions in solution

Answer 22

Start colourless
End orange
With cyclohexane - Red

Question 23

Observation when Chlorine water added to iodine ions in solution

Answer 23

Start colourless
End orange
With cyclohexane - pink

Question 24

Observation when bromine water added to iodine ions in solution

Answer 24

Start colourless
End yellow
With cyclohexane - pink

Question 25

Inferences when Chlorine water is added to bromine ions in solution

Answer 25

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

Question 26

Inferences when Chlorine water is added to iodine ions in solution

Answer 26

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

Question 27

Inferences when bromine water is added to iodine ions in solution

Answer 27

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

Question 28

Observations when adding silver nitrate solution to chloride ions

Answer 28

White precipitate forms | Cl- + Ag+ --> AgCl

Question 29

Effect of adding dilute ammonia to silver chloride precipitate

Answer 29

Dissolves

Question 30

Observations when adding silver nitrate solution to bromide ions

Answer 30

Cream precipitate forms | Br- + Ag+ --> AgBr

Question 31

Effect of adding dilute ammonia to silver bromide precipitate

Answer 31

Doesn't dissolve | Conc ammonia would dissolve it

Question 32

Observations when adding silver nitrate solution to iodide ions

Answer 32

Yellow precipitate forms | I- + Ag+ --> AgI

Question 33

Effect of adding dilute ammonia to silver iodide precipitate

Answer 33

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

Question 34

Do halogens conduct electricity?

Answer 34

No (No mobile charged particles)`

Question 35

Are halogens more soluble in hexane or water?

Answer 35

Hexane

Question 36

What is the structure/bonding of halogens?

Answer 36

Covalent bonds between atoms, LDF between molecules | Simple molecular structure