K.A-7 Skin Care

Question 1

What are the pros and cons of UV light

Answer 1

Cons
Cause skin cancer, sunburn, eye damage

Pros
Necessary for the production of vit D

Question 2

How do free radicals form

Answer 2

UV light breaks covalent bonds to form free radicals

UV light has higher energy levels so it overcomes the electrostatic attraction

Question 3

What is a result to UV light breaking covalent bonds

Answer 3

Homolytic fission where each atom leaves with 1 electron from the covalent bonds

Question 4

What has enough energy to break covalent bonds

Answer 4

UV light

Question 5

What are free radicals

Answer 5

Broken covalent bonds which are highly reactive as they have unpaired electrons

Question 6

What are the 3 stages to produce a new molecule with free radicals

Answer 6

Initiation
Propagation
Termination

Question 7

Explain the initiation stage

Answer 7

The UV light breaks a covalent bind to from 2 free radicals

Question 8

Explain the propagation stage

Answer 8

The highly reactive free radicals react with another molecule to break it apart and binds with one of the atoms

Question 9

Explain the termination stage

Answer 9

The free radicals can react with other free radicals to form molecules. Once all the free radicals become stable the reaction is over

Question 10

What is a free radical scavenger

Answer 10

Compounds that combine with free radicals to make them stable

Question 11

What are examples of free radical scavengers

Answer 11

Vitamin C and D