Question

which of the following is an example of osmosis?
all of these are correct.
a potato gains mass when placed in purified water.
sugar diffuses in a glass of water.
ice melts and puddles on the floor.

Explanation:

Osmosis is the movement of water molecules across a semi - permeable membrane from an area of lower solute concentration to an area of higher solute concentration. When a potato is placed in purified water, water moves into the potato cells (which have a higher solute concentration compared to the pure water) through osmosis, causing the potato to gain mass. Sugar diffusing in water is simple diffusion (movement of solute particles from high to low concentration). Ice melting is a physical change (phase change from solid to liquid) and not related to osmosis.

Answer:

A potato gains mass when placed in purified water.