3.8 I can describe the reaction between alkenes and bromine

1.       Write the word equation showing the reaction between ethene and bromine water

          ethene + bromine water ---------> bromoethane + hydrogenbromide

2.       Draw the displayed formula of the reaction above

3.       Explain the observations: liquid turns from brown/orange to coloress

4.       Why does this reaction not need a catalyst? because the carbon - carbon double bondsmake the alkenes very reactive

5.       What type of reaction is this called?Addition reaction.

6.       Explain why this reaction is useful

Because it is shows when a  non-saturated bond is present.

3.5 I can recall the reaction of methane and bromine

Alkanes react with bromine in the presence of UV Light

     Explain why this condition is necessary  UV light is the source on energy in order to break the weak inter molecular forces in between molecules.

  What is this type of reaction called A substitution reaction 

 State and explain the observations - Alkanes are colourless and bromine is brown, when the reactants are given energy to break intermolecular bonds the bromine is less saturated and the product is therefore colourless 

Write out a balanced (with state symbols) the reaction between ethane and chlorine

C₂H₆ + Cl₂ à C₂H₅ + HCl

 State and explain the observations in this chemical reaction

The chorine begins as a green/yellow gas, when it reacts the chlorine is less saturated and the product is more saturated making the product colourless
Displayed Formula of reaction between methane and bromine :