It's mean the theory that changes in the earth's crust during geological history have resulted from the action of continuous and uniform processes.
K will give up an electron more easily than Br.
You can boil or evaporate the water and the salt will be left behind as a solid. If you want to collect the water, you can use distillation. This works because salt has a much higher boiling point than water. One way to separate salt and water at home is to boil the salt water in a pot with a lid. So, I would say maybe oil.
n = m/M = 2/18 = 1/9 ~0,1 mol
