Factoids

Question 1

How does the boiling point of haloalkanes change down the halogen group?

Answer 1

It increases - although the bonds get more polar, ID-ID bonds get stronger, and so the larger (and more numerous) the halogen, the higher the boiling point

Question 2

Generally, what reaction occurs and what happens to colour as ammonia is added to metal complex solutions? What happens to copper?

Answer 2

It gets darker
The ammonia acts as a base, removing H+ ions from the water to make the complex ion neutral
Forming, for example, [Fe(OH)2(H2O)4] from [Fe(H2O)6]2+
In an excess of ammonia, copper can form an ammonia complex [Cu(NH3)4(H2O)]2+

Question 3

Describe the trend in the solubility of silver halides in ammonia solution

Answer 3

Decreasing solubility - AgCl dissolves in dilute or conc ammonia solution, AgBr dissolves only in conc ammonia solution, AgI does not dissolve in ammonia solution

Question 4

Write down the equation for a permanganate titration with Fe2+ ions

Answer 4

MnO(4)- + 5Fe2+ + 8H+ –> Mn2+ + 5Fe3+ + 4H(2)O

Question 5

How does the reactivity in hydrolysis of haloalkanes change down the group (describe and explain)?

Answer 5

Although you might expect increased bond polarity to increase how easily haloalkanes are hydrolysed, the more significant factor is bond enthalpy
Bond enthalpy decreases down the halogens, and lower enthalpy bonds are easier to break, so R-I haloalkanes react more rapidly under hydrolysis than R-Cl