halogens Flashcards
what group are the halogens in
group 7
what way do the halogens get more reactive
going up the group
what is the most reactive the the least
fluorine is the most reactive and iodine the least
what are the halogens a group of
reactive non metals
what colour is fluorine and whats it state at room temp
yellow , gas
what colour is chlorine and whats it state at room temp
yellow/green, gas
what colour is bromine and whats it state at room temp
red/brown, liquid
what colour is iodine and whats it state at room temp
grey/black, solid
what is displacement
when a less reactive halogen is put into a solution with a more reactive halogen the halogen will replace the less reactive halogen
what does iodine sublime to
sublime means changes from a solid to a gas
it changes from a grey-black solid to a purple gas
how can chlorine gas be tested
Chlorine gas may be tested for using damp universal indicator paper which changes to red
and then bleaches white
why do the halogens show similar chemical properties
they show similar chemical properties because
when the atoms react, they gain an electron to form a negative ion which is stable as it has a
full outer shell of electrons.
why do the reactivity of the halogens decrease as you go down the group
incoming electron is coming into a shell
further from the nucleus so the attractive power of the nucleus for the incoming electron is
less. This means that the ability of the atoms to gain an electron decreases down the group.
what is astatine expected to be
a black solid
what can iodine be used for
it can be used as a sterilising agent for wounds becuase its toxic to bacteria and not humans
