group 7 physical and chemical properties of group 7 Flashcards
what is fluorine in it’s natural state
pale yellow gas
what is chlorine in it’s natural state
yellow/green gas
what is bromine in it’s natural state
brown/orange liquid
what colour vapour does bromine form
orange vapour
what is iodine in it’s natural state
black/grey solid
what colour vapor does iodine form
purple vapour
when Cl2 is aqueous what colour solution does it form
colourless
when Br2 is aqueous what colour solution does it form
orange/brown solution
when I2 is aqueous what colour solution does it form
dark brown/black solution
why does boiling point increase as you go down group 7
the molecules get larger so the amount of electrons increases so the Van Der Waals forces between the halogen molecules are stronger and there is more of them so they require more energy to overcome resulting in a higher boiling point
why does electronegativity decrease as you go down the group
electronegativity is the tendency to attract a pair of electrons in a covalent bond
the shielding and atomic radius is increasing
therefore the electrostatic attraction between the nucleus and outer electrons is weaker
put these elements in order of their oxidising power from most to least
Br2
F2
Cl2
I2
MOST
F2
Cl2
Br2
I2
LEAST
name 3 spectator ions
Na+
K+
NO3-
write the simplest ionic equation for the reaction between chlorine and potassium bromide
CL2 + 2Br- —-> 2Cl- + Br2
Cl2 has been reduced
Br- has been oxidised
is an oxidising agent reduced or oxidised
an oxidising agent itself is reduced
