"3.5 I can recall the reaction of methane and bromine"

 1.   Alkanes react with bromine in the presence of UV light.

 2.    Explain why this condition is necessary?
        UV light provides the energy  needed to break the Bromine bonds. 

3.       What is this type of reaction called : Substitution Reaction

4.       State and explain the observations : Brown/Orange (Bromine) and the product (Bromomethane + Hydrogen Bromide) will turn colourless

5.       Draw the displayed formula of the reaction between methane and bromine (upload a photo)

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

     C2H6(g)+Cl2(g) --> C2H5CL(g)+Hcl(g)

7.       State and explain the observations in this chemical reaction

Yellow (chlorine) turns to a colourless (products are colourless)

--> Bromomethane