Salt will dissolve in water. Adding salt will lower the temperature of water by a few degrees Celsius as well as lower the freezing point.
Water dissolve and transport salt.
It lowers the boiling point, and makes it "salt water".
It floats.
They die
The cold water becomes salt water. The salt doesn't dissolve like sugar.
Your feet get wet.
they will die
The volume remain unchanged.
The concentration of salt increase up to saturation.
~When you put salt in potato and then put it in the water cup, there is low water concentration in potato and more concentration in the cup of water. Due to this concentration gradient water moves from the cup into the potato by osmosis.
adding salt raises the boiling point of water which can help speed cooking time.
Nothing...they die....