it doesn't actually it does! sorry wiki answers wudnt let me delete that last answer, but enzymes can accelerate or slow down a reaction. and then seperate/ ...

An enzyme is a catalytic protein that allows reactions to occur at much higher rates. ... this energy barrier therefore allowing reactions to proceed much earlier than they would have ... This collision works much like a lock and key effect. ... The easiest way to change the 3-D shape of a protein (in this case, enzyme) is to heat it.

Answer (1 of 1): Yes it lowers activation energy and speeds up chemical reaction itself.