Answer:
See below ~
Explanation:
Sea water has a <u>high amount of salt present</u> in it. The density of salt is <u>higher than that of water</u>. It <u>dissolves in water</u>, thereby increasing its density. Hence, this is why sea water has a higher density than tap water.
CaBr2
Because of the criss cross method of switching the charges
They didnt have a powerfull enough microscope to see them an when they could they were moving to fast unless they were cold