DN 3). Halogens and Halides

Question 1

flourine state and colour

Answer 1

gas

colourless

Question 2

chlorine state and colour

Answer 2

gas

green

Question 3

bromine state and colour

Answer 3

liquid

orange/brown

Question 4

iodine state and colour

Answer 4

solid

black

Question 5

astatine state and colour

Answer 5

solid

black

Question 6

bonding of the halogens

Answer 6

covalent

Question 7

halogens will dissolve in…….

Answer 7

hexane

Question 8

halides will dissolve in…………

Answer 8

water and hexane

Question 9

chlorine colour of hexane layer

Answer 9

colourless

Question 10

bromine colour of hexane layer

Answer 10

orange/ brown

Question 11

iodine colour of hexane layer

Answer 11

magenta

Question 12

oxidising agents take…………….and get…………

Answer 12

take ELECTRONS and get REDUCED

Question 13

identifying halide ions steps

Answer 13

HNO3 nitric acid
AgNO3 silver nitrate
NH4OH/NH3 dilute ammonia
NH3 concentrated ammonia

Question 14

why do you add acid (include equation)

Answer 14

to react with any carbonates in the water since Ag2CO3 is a white solid
2H(+) + CO3(2-) = H2O + CO2

Question 15

flouride result

Answer 15

no precipitate - -

Question 16

chloride result

Answer 16

white precipitate precipitate dissolves -

Question 17

bromide result

Answer 17

cream precipitate slightly dissolves fully dissolves

Question 18

iodide result

Answer 18

yellow precipitate insoluble insoluble

Question 19

Cl2 + water

Answer 19

Cl2 + H2O HCl + HClO

Question 20

Cl2 + water type of reaction and observations

Answer 20

Disproportionation- as the same species is oxidised and reduced
Observations with universal indicator
-red (as HCl)
-colourless (HOCl is bleach)

Question 21

Cl2 + water

in sunlight

Answer 21

2Cl2 + 2H2O ———uv—————> 4HCl + O2

Question 22

Cl2 + water
in sunlight
observations

Answer 22

Cl2 (pale green colour fades)

bubbles of 02

Question 23

Cl2 + alkali

Answer 23

Cl2 + 2OH(-) = Cl(-) + OCl(-) + H2O