3.4 recall the products of complete and incomplete combustion of alkenes

Read Chem 4 You pg 147 and Collins pg 157

1.       Saturated hydrocarbons are called alkanes

2.       Small chain alkanes are used as fuels

3.       The reaction is called combustion

4.       The word equation for  this chemical reaction is :

fuel (Alkane) + Oxygen→ Carbon Dioxide + Water+ ENERGY (heat, light, sound)

5.       If there is insufficient oxygen then the word equation is:

fuel (Alkane) + Oxygen→ Carbon Monoxide+ Water+ ENERGY (heat, light, sound)

6.       The problem with this reaction is that Carbon Monoxide is produced this gas is toxic to the human body (see objective 5.11)

7.       Where can you find incomplete combustion?

Incomplete combustion occurs in areas with little oxygen, burning a fire in the house or in  cars.

8.       What is used to reduce the harmful products from incomplete combustion?

Catalytic Converter.

9.       During incomplete combustion a smoky flame is often seen, explain this observation

A smoky flame is seen this is a result to incomplete combustion the black smoke is called soot and is solid Carbon.

Extn: write a balanced equation (with state symbols) for the combustion of propane gas

C₃H_{8 (g)} + 5O_{2 (g)}  à 3CO_2(g) + 4H₂O_(g)