3.8 I can describe the reaction between alkenes and bromine

1.       Write the word equation showing the reaction between ethene and bromine water
      ethane + bromine water --> dibromoethane
2.       Draw the displayed formula of the reaction above

3.       Explain the observations

It Bromine solution turns from Orange/Brown into colourless, this is because the concentration of bromine is decreasing and there is an increase of the product which is dibromoethane which is colourless.

4.       Why does this reaction not need a catalyst?

This reaction does not need a catalyst because ethene is unsaturated and the carbon carbon double bonds can be broken meaning they are reactive.

5.       What type of reaction is this called?

This reaction is addition reaction.

6.       Explain why this reaction is useful

To distinguish between alkenes and alkanes,  a chemical test to see if it has a double bond.