2.7 - skin care Flashcards
1
Q
what do UVA rays do?
A
age the skin
2
Q
what do UVB rays do?
A
cause burning
3
Q
how can skin be protected from the sun?
A
sun block
4
Q
what can sun block contain?
A
- zinc oxide
or - titanium oxide
5
Q
what does sun screen do?
A
filter some of the UV rays
6
Q
what reaction takes place between alkenes and halogens and why?
A
- an addition reaction
- because alkenes contain carbon to carbon double bonds
7
Q
what is a free radical?
A
atom or molecule which is highly reactive due to the presence of unpaired electrons
8
Q
what health conditions are free radicals linked to?
A
- aging process
- cancer
- alzheimer’s disease
9
Q
what are free radical scavengers?
A
molecules that react with free radicals to form stable molecules and prevent chain reactions from occurring
10
Q
why are antioxidants added to edible oils?
A
to prevent them from becoming rancid
