Group 7

Question 1

Trend in boiling points

Answer 1

Increases down the group, as molecules have more electrons and larger London forces between molecules. More energy needed to break forces.

Question 2

Electronic configuration

Answer 2

S2 P5
often react to form 1- ions

Question 3

Displacement of halide ions

Answer 3

More reactive halogen will displace halide from compound. And cyclohexane layer will have the displaced halide in it
Eg cl is colourless, br is orange and iodine is purple

Question 4

Reactivity down the group

Answer 4

Decreases as atoms gets bigger, increase in shielding, attract and accept electrons less so they readily form 1- ions less easily down the group

Question 5

Write out Disproportionation with water

Answer 5

Cl2 + H2O —> HCLO + HCL

Question 6

write out disproptionation with NaOH

Answer 6

Cl2 + 2NaOH —> NaCl + NaClO + H2O