The Halogens Flashcards
what does F2 look like at rtp?
almost colourless gas
what does Cl2 look like at rtp?
pale green gas
what does Br2 look like at rtp?
red-brown liquid which easily vapourises giving brown vapour
what does I2 look like at rtp?
grey-black solid which sublimes on heating giving purple vapour
what’s the trend for colour down group 7?
colour gets darker
what’s the trend for mp and bp down group 7?
increases, they get less volatile and switch from gas to liquid to solid (because intermolecular bonds get stronger)
are halogens oxidising or reducing agents?
oxidising agents - have to gain one electron to achieve noble gas configuration
how does oxidising power change up group 7 & why?
oxiding power increases up group 7 because as you go up the groups, the halogen has fewer shells so the incoming electron is closer to the +ve nucleus & less shielded so more strongly attracted
why do 2 layers form when organic solvents and water are shaken?
organic solvents and water are immiscible (do not mix)
what colour is Cl-?
colourless
what colour is Br-?
colourless
what colour is I-?
colourless
what colour is Cl2 in aqueous solutions?
almost colourless
what colour is Br2 in aqueous solutions?
orange
what colour is I2 in aqueous solutions?
brown
