Water potential Flashcards
what does a solution consist of?
A solution consists of a solute dissolved in a solvent.
Why is water a very good solvent?
Water is a very good solvent as it is dipolar meaning the hydrogen side of the molecule is slightly positive while the oxygen side is slightly negative.
what is solvation?
solvation is the interaction between a solvent and a solute.
how are hydration shells created around each solute particle?
hydration shells are created around each solute particle as polar solvents can orientate themselves toward polar solutes and ions to form hydrogen bonds or ion dipole forces.
what are all cells surrounded by?
all cells are surrounded by a cell membrane which is partially permeable.
how can water move in and out of cells?
by osmosis.
what is osmosis?
osmosis is the diffusion of water molecules from a less concentrated (dilute) solution to a more concentrated solution across a partially permeable membrane.
what does water move down?
water moves down a contraption gradient.
what does a partially permeable cell membrane allow?
a partially permeable cell membrane allows small molecules like water through but not larger molecules like solute molecules.
what is a hypotonic solution?
a hypotonic solution is one with a lower solute concentration meaning its diluted.
what happens when a cell is placed in a hypotonic solution?
when a cell is placed in a hypotonic solution (diluted), there will be a net movement of water molecules into the cell by osmosis.
what is a hypertonic solution?
a hypertonic solution is one that has a higher solute concentration (more concentrated).
what happens when a cell is placed in a hypertonic solution?
when a cell is placed in a hypertonic solution, there will be a net movement of water molecules out of the cell.
what is an isotonic solution?
an isotonic solution is one where there is a similar concentration as the cytoplasm of the cell.
what happens when a cell is placed in an isotonic solution?
when a cell is placed in an isotonic solution, there will be no net movement of water into or out of the cell by osmosis.
-but there are always water molecules moving into and out of the cells due to the kinetic energy that the molecules possess. there is movement just no net movement.