Spectroscopy

Question 1

What are the 5 stages of mass spectroscopy?

Answer 1

Vapourise
Ionisation
Acceleration
Deflection
Detection

Question 2

What are the 2 uses of infrared spectroscopy?

Answer 2

Breathalysers

Monitoring pollutant gases

Question 3

How is infrared used in breathalysers?

Answer 3

Detect ethanol in breath samples

More infrared absorbed, more ethanol in breath

Question 4

How is infrared used in monitoring pollutant gases?

Answer 4

Remote sensors analyse the infrared spectra of vehicle emissions.
Detects CO, CO2 and hydrocarbons in busy town centres and by motorways

Question 5

What are the 3 main greenhouse gases?

Answer 5

CO2
CH4
H2O

Question 6

What increases the greenhouse effect?

Answer 6

Amount of gas (Conc/mol)

Amount of infrared it can absorb

Question 7

What happens to bonds in molecules when infrared is added?

Answer 7

They vibrate more (gained energy)

Question 8

What happens to linear molecules when infrared is added?

Answer 8

Bonds temporarily get longer then shorter

Question 9

What happens to non linear molecules when infrared is added?

Answer 9

Bond angle temporarily increases then decreases

Question 10

What affects how much a bond vibrates?

Answer 10

Heavier atoms vibrate less

The stronger the bond the less it vibrates

Question 11

What sentence do you always say in infrared spectroscopy?

Answer 11

There is an absorption at ___ cm^-1 therefore, there is a ___ bond