skincare 2.5

Question 1

uv light

Answer 1

a high energy form of light present in sunlight, it has enough energy to break bonds

Question 2

what can overexposure of sunlight cause

Answer 2

sunburn and premature ageing

Question 3

how to stop sunburn and premature ageing

Answer 3

sunblock provides a chemical and physical barrier stopping uv light from reaching the skin

Question 4

when are free radicals formed

Answer 4

when uv light breaks bonds

Question 5

free radicals

Answer 5

atoms or molecules that are highly reactive due to the presence of unpaired electrons

Question 6

what do free radicals cause

Answer 6

chain reactions because they are reactive

Question 7

the three steps of chain reactions

Answer 7

initiation, propagation and termination

Question 8

free radical scavengers

Answer 8

molecules which react with free radicals to prevent chain reactions occuring

Question 9

what are free radical scavengers added to

Answer 9

cosmetics, plastics and foods