1. LO: I understand how alkenes react with hydrogen.
5.2 Alkene Reactions
5.2.1 Reaction with Hydrogen
LO: I understand how alkenes react with hydrogen.

2. All alkenes contain one carbon to carbon .
double bond
reactive
The double bond is the part of the alkene molecules.
The double bond is known as a group.
functional
Alkenes undergo reactions.
addition
is an example of an addition reaction.
Hydrogenation
LO: I understand how alkenes react with hydrogen.

3. Hydrogen adds across the bond.
double
2-methylbut-1-ene
2-methylbutane
Hydrogenation requires high temperature, high pressure and a catalyst.
nickel
LO: I understand how alkenes react with hydrogen.

4. 5.2.2 Reacting with Halogens
LO: I understand how alkenes react with halogens.

5. Alkenes also react with in an addition reaction.
halogens
but-1-ene
1,2-dibromobutane
The brown bromine colour as the bromine molecules add on to the double bond.
disappears
LO: I understand how alkenes react with halogens.

6. 5.2.3 Reacting with Hydrogen Halides
LO: I understand how alkenes react with hydrogen halides.

7. Alkenes also react with hydrogen halides.
prop-1-ene
2-iodopropane
The adds on to the carbon with least hydrogens attached.
halogen
LO: I understand how alkenes react with hydrogen halides.