100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
IB HL Chemistry Summary: Depletion of the Ozone Layer and UV absorption in the Atmosphere (from Structure& Bonding topic) $5.79   Add to cart

Summary

IB HL Chemistry Summary: Depletion of the Ozone Layer and UV absorption in the Atmosphere (from Structure& Bonding topic)

 5 views  0 purchase
  • Course
  • Institution

These notes cover the equations from the Structure & bonding topic on ozone depletion in chronological order.

Preview 1 out of 2  pages

  • September 2, 2023
  • 2
  • 2021/2022
  • Summary
  • Unknown
avatar-seller
Depletion of the Ozone Layer and UV absorption in the Atmosphere


Ozone = an allotrope of oxygen gas

- It is made naturally in the atmosphere
- It can also be made by photocopiers and laser printers

- Ozone formation (In the stratosphere)
Oxygen gas molecules are bombarded by high energy UV light from the sun
This causes them to break up to form Oxygen radicals
The oxygen radicals then react with more oxygen gas molecules to make ozone
O2  2O.
2O. + 2O2 2O3
3O2  2O3

- Ozone Destruction
The ozone gas molecules are hit by other UV radiation from the Sun
They break up to form oxygen gas molecules and oxygen radicals
2O3 2O. + 2O2
Oxygen radicals join up to form O2 molecules
2O. O2
2O3 3O2



UV Information

- Can be divided into 3 components
- UV-C(highest energy, shortest wavelength), UV-B, UV-A

- Ozone and O2 absorb UV as they undergo dissociation and form free radicals


Free Radicals

= atoms or groups of atoms with unpaired electrons

- An oxygen free radical is simply an oxygen atom (it has 2 unpaired electrons)
- Shown as O.



CFCs

Chlorofluorocarbon (CFC) = is an organic molecule containing chlorine, fluorine and carbon
atoms

- Used as:
Refrigerants
Bubbles in expanded polystyrene
Inert atmosphere
Aerosol propellants

- Chlorine Radicals
Remove ozone, turn it back into oxygen gas without absorbing UV light
The Cl. are reformed
Very long lasting (up to 30 years) >> react with lots of oxygen

How do CFCs remove ozone?
Cl• + O3 → ClO• + O2 O3 + ClO• + O• → ClO• + O2 + Cl• + O2

Simplified O3 + O• → 2O2

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller deliciapascall. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $5.79. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

67474 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$5.79
  • (0)
  Add to cart