2.9 Skin Care

Question 1

What type of radiation does sunlight contain

Answer 1

UV

Question 2

What does UV radiation cause to happen in skin

Answer 2

Causes collagen to break down

Question 3

What is sunscreen

Answer 3

Contains compounds that filter the UV light so less UV light reaches the skin

Question 4

What is sunblock

Answer 4

Contains compounds that reflect the UV so it does not reach the skin at all

Question 5

Name the 3 types of radiation

Answer 5

UVA UVB UVC

Question 6

What are free radicals

Answer 6

Highly reactive substance with an unpaired electron

Question 7

When are free radicals formed

Answer 7

When a covalent bond is broken by energy supplied by UV light

Question 8

What are the 3 stages of free radical reactions

Answer 8

Initiation
Propagation
Termination

Question 9

What stage is it when both free radicals are on the right

Answer 9

Initiation

Question 10

What stage is it when there is a free radical on each side

Answer 10

Propagation

Question 11

What stage is it when both free radicals are on the left

Answer 11

Termination

Question 12

When does the free radical chain reaction end

Answer 12

When 2 free radicals are reacted together

Question 13

What are free radical scavengers

Answer 13

Chemicals that react with and destroy free radicals because they have an unpaired electron

Question 14

Why do free radicals form in the atmosphere

Answer 14

Because UV radiation breaks the bonds in molecules