Question: what is photochemistry

Jonathan Hunter answered on 14 Jun 2016:

Photochemistry use of light (instead of heat) to make chemical reactions occur.
The best example of this is how plants use light to make carbon dioxide and water into sugars and oxygen.
Without getting into the nitty gritty of it all, the light passes energy to a molecule which can then go on to react with other things. You can also make things that are very difficult to make any other way.
It’s a potentially very environmentally friendly way of making medicines because you could use the Sun to carry out reaction
and not have to burn fossil fuels to heat a reaction.
One recent example of photochemistry being used to make medicines is Artemisin (an anti malarial drug) which is partly made using light!