Table of Contents
- 1 What is the condition in which there is continuous movement but no overall change in concentration?
- 2 What is the continuous movement of particles?
- 3 What is it called when concentration is equal but molecules are still moving?
- 4 When would there be no net movement of particles or water in or out of a cell?
- 5 What is the movement of particles from low concentration to high concentration?
- 6 Is the movement of particles along the concentration gradient?
- 7 What is the difference in concentration called?
What is the condition in which there is continuous movement but no overall change in concentration?
Glencoe Chapter 9 Review
| A | B |
|---|---|
| Define dynamic equilibrium | Condition of continuous movement but no overall change in concentration; movement of materials into and out of the cell at equal rates maintains its dynamic equilibrium with its environment. |
What is the continuous movement of particles?
Diffusion is defined as the net movement of molecules from an area of greater concentration to an area of lesser concentration. The molecules in a gas, a liquid or a solid are in constant motion due to their kinetic energy. Molecules are in constant movement and collide with each other.
Which term describes the movement of water with no overall change in concentration?
Osmosis occurs until the concentration gradient of water goes to zero or until the hydrostatic pressure of the water balances the osmotic pressure. Osmosis occurs when there is a concentration gradient of a solute within a solution, but the membrane does not allow diffusion of the solute.
What is it called when concentration is equal but molecules are still moving?
Diffusion is the movement of molecules from an area of high concentration of the molecules to an area with a lower concentration. At equilibrium, there is equal movement of materials in both directions. If a molecule can pass freely through a cell membrane, it will cross the membrane by diffusion (Figure below).
When would there be no net movement of particles or water in or out of a cell?
If the concentration of solutes of the cell matches that of the extracellular fluid, there will be no net movement of water into or out of the cell. Blood cells in hypertonic, isotonic, and hypotonic solutions take on characteristic appearances (Figure 3.26).
What is difference between osmosis and diffusion?
In diffusion, particles move from an area of higher concentration to one of lower concentration until equilibrium is reached. In osmosis, a semipermeable membrane is present, so only the solvent molecules are free to move to equalize concentration.
What is the movement of particles from low concentration to high concentration?
Comparison chart
| Diffusion | |
|---|---|
| What is it? | Diffusion is a spontaneous movement of particles from an area of high concentration to an area of low concentration. (ex. tea flavoring moving from an area of high to low concentration in hot water.) |
Is the movement of particles along the concentration gradient?
In passive transport, particles (e.g. ions or molecules) are transported along the concentration gradient. This means that the particles move from areas of high concentrations to areas of low concentrations. Because of the passive movement of particles no chemical energy is spent as it takes place.
When there is no net change in the movement of water?
Osmosis refers to the movement of water molecules only. Water molecules move from solution one to solution two. When the concentration of water is the same on both sides of the membrane, the movement of water molecules will be the same in both directions. There will be no net movement of water molecules.
What is the difference in concentration called?
The difference in the concentration of a substance between two areas is called the concentration gradient . The bigger the difference, the steeper the concentration gradient and the faster the molecules of a substance will diffuse. The direction of diffusion is said to be ‘down’ or ‘with’ the concentration gradient.