inorganic group 7

Question 1

how does boiling point change as you go down group 7

Answer 1

increases. vdw increase as relative mass and size increase so easier to lose outer electron

Question 2

how does electronegavity change going down the group

Answer 2

decreases. more shielding so weaker attraction between outer electron and positive nucleus. larger atomic radius

Question 3

describe disproportionation reactions

Answer 3

a more reactive halogen will displace a less reactive (lower down) halide ion

Question 4

give examples of disporportionation reactions

Answer 4

KBl and Cl2= cl2+2br- -> br2 +2Cl- orange
KI and Cl2= Cl2 + 2I- -> 2Cl- + I2 brown
KI and Br2= Br2 +2I- -> I2 +2Br- brown