DN 3). Halogens and Halides Flashcards Preview

Chemistry > DN 3). Halogens and Halides > Flashcards

Flashcards in DN 3). Halogens and Halides Deck (23):
1

flourine state and colour

gas
colourless

2

chlorine state and colour

gas
green

3

bromine state and colour

liquid
orange/brown

4

iodine state and colour

solid
black

5

astatine state and colour

solid
black

6

bonding of the halogens

covalent

7

halogens will dissolve in.......

hexane

8

halides will dissolve in............

water and hexane

9

chlorine colour of hexane layer

colourless

10

bromine colour of hexane layer

orange/ brown

11

iodine colour of hexane layer

magenta

12

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

take ELECTRONS and get REDUCED

13

identifying halide ions steps

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

14

why do you add acid (include equation)

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

15

flouride result

no precipitate - -

16

chloride result

white precipitate precipitate dissolves -

17

bromide result

cream precipitate slightly dissolves fully dissolves

18

iodide result

yellow precipitate insoluble insoluble

19

Cl2 + water

Cl2 + H2O HCl + HClO

20

Cl2 + water type of reaction and observations

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

21

Cl2 + water
in sunlight

2Cl2 + 2H2O ---------uv---------------> 4HCl + O2

22

Cl2 + water
in sunlight
observations

Cl2 (pale green colour fades)
bubbles of 02

23

Cl2 + alkali

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