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Starter – define these terms in the front of your book.

Starter – define these terms in the front of your book. Fuel Combustion Combustion triangle Complete combustion Incomplete combustion. Objectives. To be able to explain the difference between complete and incomplete combustion.

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Starter – define these terms in the front of your book.

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  1. Starter – define these terms in the front of your book. • Fuel • Combustion • Combustion triangle • Complete combustion • Incomplete combustion

  2. Objectives • To be able to explain the difference between complete and incomplete combustion. • Understand the what factors are important when choosing a fuel.

  3. What do you need for combustion?

  4. Combustion experiment Figure 7e02

  5. Products of combustion

  6. Bunsen Burners What hydrocarbon is burner in a Bunsen burner? Draw its display formula and name the family of hydrocarbons that it comes from. Turn the collar – what do you notice about the flame colour and heat generated? Using tongs, hold a watch glass over the flame, what do you notice on the watch glass for each different flame colour? Which flame is complete combustion and which is incomplete combustion?

  7. Complete Excess oxygen; Only water and carbon dioxide are produced. Incomplete Not enough oxygen; Water, carbon dioxide, carbon monoxide and carbon is produced. Types of combustion for hydrocarbons Combustion is an oxidising reaction.

  8. What makes a good fuel? • Easy to transport. • Ignites easily. • Smokeless. • Contains a lot of energy. • Easy to extract. • Cheap. • Safe.

  9. What’s the best fuel?

  10. Plenary – true or false? • Combustion is an oxidation reaction. • Hydrocarbons contain carbon, hydrogen and oxygen. • Complete combustion is when there is restricted oxygen. • Carbon monoxide is poisonous. • The test for water is UI goes green. • The test for carbon dioxide is a lighted splint makes a pop!

  11. What information can you get from the graph?

  12. Objectives • To be know the general equation for the complete and incomplete combustion of hydrocarbons. • To be able to write balanced symbol equations for combustion of hydrocarbons.

  13. carbon dioxide + + propane oxygen  water + + C3H8 5O2  3CO2 4H20 Complete combustion of propane Propane is a hydrocarbon used in camping gas. What is the equation for its combustion? How would the equations change if butane was used?

  14. Incomplete combustion of propane Propane is a hydrocarbon used in camping gas. What is the equation for its combustion? carbon dioxide + + Water + carbon + carbon monoxide propane oxygen  + + 2C3H8 7O2  2CO2 8H2O + 2C + 2CO How would the equations change if butane was used?

  15. The problem with carbon monoxide • Toxic • Binds to haemoglobin more than oxygen.

  16. Plenary – Where is the science?

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