3.4 I can recall the products of complete and incomplete combustion of alkenes

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

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

fuel (Hydrocarbon) +Oxygen → Carbon monoxide + Water + ENERGY (heat, light, sound)

6.       The problem with this reaction is that Carbon monoxide is produced. This gas is a danger to the human body (see objective 5.11)

7.       Where can you find incomplete combustion?

          In cars

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

         A catalytic converter

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

         It's because of the soot (unburned carbon)

Extension- Write a balanced equation for the combustion of propane gas

C3H8 (g) + 5O2 (g) --> 3CO2 (g) + 4H2O (l)
10. Describe the two chemical tests for water      
 anhydrous copper sulphate turns from white to blue
      
 cobalt 2 chloride paper turns from blue to pink