halogens Flashcards
what are halogens
covalently bonded, simple molecular substances
properties of halogens
diatomic, darker, mp and bp increases down the group
fluorine’s state + coloured
pale yellow gas
state and colour of chlorine
pale green gas
state and colour of bromine
brown liquid
state and colour of iodine
grey solid - purple gas
state and colour of astatine
black solid
why do halogens get less reactive as u go down the group
more electron shells, outer electron further from nucleus, attraction is weaker
results of dissolving HCl in water
HCl (g) dissolves to form HCl (aq), dissociates to form H+(aq) - acidic so hydrochloric acid has formed
colour of aqueous chlorine
colourless
colour of aqueous bromine
yellow
colour of aqueous iodine
brown
colour of potassium chloride, bromide, iodide
colourless
reactivty series of chlorine, bromine, iodine
chlorine > bromine > iodine
