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The cell will not loose or gain water.An isotonic solution means that the amount of solutes outside the cell is similar or equal to the amount of solutes inside the cell. Water is moving by osmosis both in and out of the cell at equal rates; the net movement of water is zero.A cell will lose water in a hypertonic solution (more solute in the surrounding environment) and gain water in a hypotonic solution (more solute in the cellular environment). Whether or not a solution is hypertonic, hypotonic, or isotonic is relative to the environment in the cell.
If cells are placed in a hypotonic solution the cells gain water. The hypotonic solution has lower solute concentration then the cell's cytoplasm so the water will enter via osmosis.
They need to gain them.
Water evaporates from a solution when the molecules at the surface gain enough kinetic energy to break the intermolecular bonds holding them to the solution, moving into the gas phase. This process continues until equilibrium is reached, where the rate of evaporation equals the rate of condensation.
Metals lose electrons, nonmetals gain electrons.