group 7- halogen activity Flashcards
3 properties of group 7 halogens
they’re non metals, poor conductors of heat and electricity, toxic and corrosive
what’s the pattern in reactivity in group 7
they get less reactive as you go down the group
what’s the pattern in boiling and melting points in group 7
they increase as you go down the group
state the appearance of chlorine and how reactive it is
pale green gas- extremely reactive
state the appearance of flourine and how reactive it is
yellow gas- extremely reactive
state the appearance of bromine and how reactive it is
orange liquid-very reactive
what is a halid salt and what are their uses
sodium chloride= table salt
sodium flouride= toothpaste
sodium bromide= disinfectants
sodium iodide = prevents iodine defficiancy
what happens when the halogens react with hydrogen
it forms hydrogen halides which dissolve into water to form acidic soloutions
what do group 7 elements form when they react with metals
salts
use of iodine
Antiseptic used during hospital procedures
what type of molecule are the halogens and what does it mean
diotomic- This means that the elements are made up of pairs of atoms that are chemically joined together (for example, fluorine exists as F2, chlorine as Cl2, bromine as Br2 and iodine as I2).
what are the melting and boiling points as they are non metals
low
at room temperature what are flourine and chlorine
gases
at room temperature what are iodine and asotine
solids
at room temperature what is bromine
liquid
