Includes 6 mark questsion.
(i) How do the diagrams show that both bromine and iodine are elements?
Bromine molecule contains atoms
iodine molecule contains (atoms);
How does the equation show that bromine is more reactive than iodine?
The displaces the from the solution and a reactive element will take the place of a reactive element in a displacement reaction.
(ii) How do the diagrams show that both bromine and iodine have diatomic molecules?
The halogen molecules are made up of non-metal joined by a covalent bond.
Add Chlorine water to potassium bromide solution
Colour change from to so chlorine is more reactive than bromine
(Add petroleum ether layer forms).
KBr → Br₂ + 2KCl
Cl2 + 2KI I2 + 2KCl
Add Chlorine water to potassium iodide solution
chlorine + potassium iodide gives solution.
Add petroleum ether and top layer forms.
