Ch 9 Group 17

Question 1

Is bromine more dense then air

Answer 1

Yes

Question 2

Dissolve in cyloxegane

Colours

Answer 2

Iodine purple
Bromine orange
Chlorine pale green

Question 3

Reaction with hydrogen. Conditions 
F
Cl
Br 
I

Answer 3

I (reacts vigorously in dark conditions.)
Cl (reacts explosivley in sunlight)
Br(reacts slowley on heating)
I. (Forms equilibrium mixture on heating )

Question 4

Coloure of iodine vapours

Answer 4

Purple gas

Question 5

Silver nitrate and ammonia test

Answer 5

Silver nitrate. Aq ammonia conc NH3
Cl. White. Dissolve. Dissolve
Br cream. Insoluble. Dissolves
I. Pale yellow. Insoluble. Insoluable

Question 6

Sulfuric acid acts as what with NaBr and NaI

Answer 6

Oxidising agent as they are vetter reducing agent

With others it acts as a acid

Question 7

NaBr + H2So4

Answer 7

Br2 + So2 +2H2O

Reddish brown gas observed

Question 8

Chlorine in cold alkali

Chlorine in hot alkali

Answer 8

Cold
Cl2 + 2NaOH. =. NaCl + NaClO + H2O
Oxidation. 0. -1. +1
Disproportionate reaction

Hot
3Cl2. + 6NaOH. = 5 NaCl + NaClO3 + 3 H2O
0. -1. +5

Question 9

Chlorination of water equation

And what kills bacteria

Answer 9

Cl2 + H2O = HCl. + HClO

HClo decomposes slowly forming. { O } this is what kills bacteria