Understanding Nucleophilic and Electrophilic Attacks in Organic Chemistry

[Natalie12]

How to see if there is a nucleophilic or electrophilic attack?


Nucleophilic or electrophilic attack? What type of attack performs
a) the water molecule in the attack with one of its free electron pairs?
b) bromine molecule when in an attack with a double bond?
Motivate!

I think that a) is nucleo and b) is as well, or? Please help! Could someone illustrate with drawings or similar? Because I don't understand a thing of this (I practically give up!)

 

[chemisttree]

For b) draw the intermediate from the attack of Br₂ on the double bond.