Reverse Telomerase

[mage lang=”en|es|fr|en” source=”flickr”]reverse telomerase[/mage]
What actually is a chemical?

What actually is a chemical? for example in Biology would proteins, lipids, carbohydrates and enzymes such as telomerase, reverse transcriptase and intergrase be classed as chemicals?

according to me :-
anything which reacts with itself or any other substance in any condition is a chemical.
it may be in any physical form but it changes its composition in one or more physical condition either by decomposition or self association or by reacting with other chemical.
and all the biological substances like enzymes and hormones are also chemicals as they r synthesized and decompose time to time.