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Lower Atmosphere
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1. Oxidants & Observation
2. Radiation & greenhouse gases
3. Ozone & fire
- ozone reactions
- ozone abundance
- fire
* Worksheet 1
* Worksheet 2
* Worksheet 3
4. Gases in the atmosphere
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Lower Atmosphere

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3. Ozone and fire - more

Worksheet 1: Ozone and its chemical properties

 

 

 

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T 1

Draw the second resonance structure of the ozone molecule below.

 

formula ozone

 

T 2

Explain why the O3 molecule has dipole character and compare it with a CO2 molecule and a H2O molecule.

T 3

If ozone reacts with an alkene (ozonolysis), the alkene molecule is cracked at the C=C double bond. The products of the reaction are two carbonyl compounds.  Write down and name the products of the ozonolysis of:

a) 2-butene

b) 2-methyl-2-butene


Some properties of ozone:

 

l T boiling = -112.5° C

l poorly water-soluble

l T melting = -251.4° C

l soluble in organic solvents i.e. in CF2Cl2

l µ = 0.49 D

l toxic

l bluish color

l O2/O3 (w (O3) < 10% stable below 100° C

l characteristic smell

l O3(l), O3(s) explode during contact


strong oxidizing agent:

 

equation

 

examples of oxidation reactions with ozone

 

equation

 

T 4

Can oxidation by ozone proceed better at high or low pH? Give reasons for your answer using the information in the box above.

T 5

Iodide ions can also be oxidized by molecular chlorine. Write down the reaction scheme and explain the difference to reaction 1 in the box above.

T6

In atmospheric cloud droplets, ozone oxidises sulphurous acid (sulphur dioxide in water). This oxidation is most efficient at high pH levels.

  • Discuss this result.
  • Refer to your results from T4.

 

About this page:
authors: M. Seesing, M. Tausch - Universität Duisburg-Essen, Duisburg, Germany
scientific reviewer: Dr. Rolf Sander - Max Planck Institute for Chemistry, Mainz - 2004-05-18
last update: 2004-06-07

 

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last updated 02.03.2006 17:58:56 | © ESPERE-ENC 2003 - 2013