Name four addition reactions of alkenes

What is added to an alkene in a hydrogenation reaction?
What is formed?
Are there any required conditions?

What is added to an alkene in a hydration reaction?
What is the product formed?
Are there any required conditions?

What reacts with an alkene in a halogenation reaction?
What is the product formed?
Are there any required conditions for this reaction?

What reacts with an alkene in a hydrogen halide reaction?
What is the product formed?
Are there any required conditions for this reaction?

In an addition reaction what happens?
e.g, what bond(s) is broken?

Define the term 'electrophile'

How come electrophillic addition occurs?

State very simply, the basis of Markovnikoff's Rule

Draw out and label with all appropriate curly arrows, the electrophillic addition mechanism for ethene and chlorine