Rections of alkenes

What is the word equation for a reaction of alkenes with hydrogen?

Alkene + H2 → alkane (when a catalyst is applied e.g nickel)

What happens when alkenes react with hydrogen?

The hydrogen atoms adds onto the carbon atoms in the C=C double bonds and this converts an unsaturated alkene into a saturated alkane.

What happens in reactions of alkenes with steam?

The atoms of water add into the carbon atoms in the C=C double bond. This forms an alcohol.

What is the word equation for the reaction of alkenes with steam?

Alkene + water → alcohol (when there is high temperature and pressure and a catalyst)

What happens in reactions of alkenes with halogens?

The halogens all react with alkenes, the C=C bond opens up and one halogen atom adds onto each of the carbon atoms in the double bond.

What happens when alkenes react with oxygen?

Alkenes will burn in oxygen however they tend to burn in air with smoky flames due to incomplete combustion and they are very valuable as they can be used to make polymers or a a starting material for many other chemicals.