1. Explain that ozone is continuously being formed and broken down in the stratosphere by ultraviolet radiation. Describe, using equilibria, how the ozone concentration is maintained in the ozone layer, including the role of ultraviolet radiation. Outline the role of ozone in the absorption of harmful ultraviolet radiation and the resulting benefit for life on Earth. Week 28 © Pearson Education Ltd 2008 This document may have been altered from the original

2. Ozone, O 3 Week 28 © Pearson Education Ltd 2008 This document may have been altered from the original

3. Ozone in the atmosphere Week 28 © Pearson Education Ltd 2008 This document may have been altered from the original

4. Absorption of UV radiation by the ozone layer Week 28 © Pearson Education Ltd 2008 This document may have been altered from the original

5. Understand that radicals from CFCs and NOx may catalyse the breakdown of ozone. Explain that apparent benefits may be offset by unexpected and detrimental side effects. Week 28 © Pearson Education Ltd 2008 This document may have been altered from the original