colours of halogens Flashcards
1
Q
Chlorine
A
Chlorine a dense pale green gas, highly reactive and very toxic (used in WWI).
2
Q
Bromine
A
Bromine is a dark red liquid that is easily vapourised to an orange–brown vapour,
3
Q
Iodine
A
Iodine is a very dark grey crystalline solid that on heating sublimes to give a brilliant purple vapour
4
Q
Fluorine
A
Fluorine is a pale yellow gas, the most reactive non-metallic element known
5
Q
Reaction of Chloride with sulphuric acid
A
NaCl + H2SO4 –> NaHSO4 +HCl
6
Q
Reaction of Bromide with sulphuric acid
A
H2SO4 + 2H+ + 2Br– –> SO2 + 2H2O + Br2
7
Q
Reaction of Iodide with sulphuric acid
A
H2SO4 + 8H+ + 8I- –> 4I2 + H2S + 4H2O
