UNIT 2- SKINCARE Flashcards
1
Q
what is UV?
A
it is a high energy form of light from the sun
2
Q
.
A
3
Q
what are the three types of UV radiation?
A
- UVA
- UVB
- UVC
4
Q
What are free radicals?
how are they formed? what are they able to do? what are they?
A
- highly reactive atoms that have 1 unpaired electron
- unstable
- formed when a covalent bond is broken by energy supplied by UV light
- able to cause chain reations forming free radicals
5
Q
state the 3 stages of free radicals
A
initiation
propagations termination
6
Q
what are free radical scavengers?
A
- chemicals that react and destroy free radicals
- desirable as they help protect skin from UV
- prevent the chain reactions from occuring
- common free radical scavanges are O. and HO.
