Question

conclusion:

1. what is diffusion?
2. does it require energy?
3. does it move particles from high to low or low to high concentration?
4. do molecules move down or against a gradient?
5. describe to someone how to determine the direction molecules will flow in diffusion and at what point they balance out on each side of the membrane.
6. draw a before and an after diffusion pic of a cell with 8 molecules of solute inside and 2 molecules of solute outside.
7. diffusion is the process where molecules move from an area of high concentration to an area of low concentration. this continues till theres an equilibrium where the concentration of molecules is equal on both sides of a membrane.

Explanation:

Diffusion is a passive - transport process in Biology. It doesn't require energy. Molecules move from high to low concentration (down the concentration gradient). Equilibrium is reached when concentrations are equal on both sides of a membrane. For the cell example, 3 molecules would move from inside to outside to reach equilibrium (total 10 molecules, 5 on each side).

Answer:

1. No, it does not require energy.
2. It moves particles from high to low concentration.
3. Molecules move down a gradient.
4. Molecules flow from high - concentration area to low - concentration area. They balance out when the concentration of molecules is the same on both sides of the membrane.
5. Before diffusion: Inside cell - 8 solute molecules, Outside cell - 2 solute molecules. After diffusion: Inside cell - 5 solute molecules, Outside cell - 5 solute molecules (draw simple diagrams representing these states with a membrane separating the inside and outside of the cell and dots representing solute molecules).