1.1. Three of the halogens in Group VII are:

chlorine
bromine
iodine

i) How does their colour change down the Group?

[1]

ii) How does their physical state (solid, liquid or gas) change down the Group?

[1]

iii) Predict the colour and physical state of fluorine.

Colour ....................

Physical state ....................

[2]

1.2. Describe how you could distinguish between aqueous potassium bromide and aqueous potassium iodide.

Test ....................

Result with bromide ............................................................

Result with iodide ............................................................

1.3. 0.015 moles of iodine react with 0.045 moles of chlorine to form 0.030 moles of a single product.

Complete the equation.

I₂ + ............ Cl₂ → ................................

1.4. Traces of chlorine can be separated from bromine vapour by diffusion.

Which gas would diffuse the faster and why?