Radiation interacting with matter - OZ

Question 1

What happens when a particular molecule absorbs microwaves of certain energy levels

Answer 1

It will alter its rotational energy level

Question 2

What happens when a particular molecule absorbs infrared radiation of certain energy levels

Answer 2

It will alter its vibrational energy level

Question 3

What happens when a particular molecule absorbs visible/uv of certain energy levels

Answer 3

It will alter the energy level of electrons

Question 4

What happens to electrons when exposed to uv/visible light

Answer 4

Electrons are promoted to higher energy levels
And if the there is a high enough energy of uv:
Photodissociation (where a bond in the molecule breaks)
Or ionisation (where an electron is lost giving a positive ion)

Question 5

What is the ozone layer and what does it do

Answer 5

Certain gases in the upper atmosphere (particularly ozone) absorb high energy uv radiation coming from the sun. This is vital for life as otherwise this harmful high energy uv would reach the earth’s surface where it could damage DNA and cause skin cancer, damage to crops or eye damage

Question 6

Is ozone in the stratosphere good

Answer 6

Yes as it absorbs harmful high energy uv

Question 7

Is ozone in the troposphere good

Answer 7

No as it is toxic and leads to photochemical smog and breathing problems

Question 8

How to find the minimum frequency of radiation needed to break a covalent bond

Answer 8

1. Bond enthalpy X 1000 to get Jmol^-1
2. Divide by avagadros constant to get J
3. Use E=hv to convert energy to frequency

Question 9

Stratosphere definition

Answer 9

upper atmosphere

Question 10

Troposphere definition

Answer 10

lower atmosphere