COMBUSTION

• Describe the process of combustion

• Write word and symbol equations for combustion reactions.

• https://www.youtube.com/watch?v=zEjEqnMBdEM

Starter

Suggest one use for each fuel:

• Natural gas• Petrol• Diesel• Kerosene• Heating oil

If you light a candle and put jar over it, what do you predict will happen? Can you explain this?

So, what are needed? What type of reaction is

this?Why do we burn things?

To describe the process of combustion.

Crude oil can be separated by fractional distillation. The oil is evaporated and the hydrocarbon chains of different lengths condense at different temperatures:

Fractions with low boiling

points condense at

the top

Fractions with high boiling

points condense at the bottom

To describe the process of combustion.

The apparatus below is used to test what is made when the hydrocarbon wax burns…

any hydrocarbon + oxygen water + carbon dioxide

Suctionpump

Candle wax is thehydrocarbon here

ice-water

Liquid collectedcan be tested withanhydrous cobalt chloridepaper (bluepink).

Lime water

1. Complete combustion- With enough oxygen

2. Incomplete combustion- without enough oxygen

To describe the process of combustion.

Methane

Oxygen

Carbon Dioxide

Water

+ + + +

Methane

Oxygen

Carbon Monoxide

Water

CH4

O2 2

CO2

H2O 2

+ + + +

CH4 2

O2 3

CO 2

H2O 4

• Methane + Oxygen Carbon Dioxide + Water

• CH4 + 2O2 -> CO2 + 2H2O

• Methane + Oxygen -> Carbon Monoxide + Water

• 2CH4 + 3O2 -> 2CO + 4H2O

To write word and symbol equations for combustion reactions.

Now work through the questions on page 223 of your SciPad

To know possible fuels that can be used in the home.

• https://www.youtube.com/watch?v=UygUcMkRy_c

In the back of your books, see how many questions you can answer without looking at your notes

Success criteria-• Describe

the process of combustion

• Write word and symbol equations for combustion reactions.

1. State 3 fuels we use daily.2. What happens when fuels burn?

3. What is complete combustion?

4. Word equation-

5. Symbol equation-

6. What is incomplete combustion?

7. Word equation-

8. Symbol equation-

9. What is a problem with burning fossil fuels?