What is diffusion?
Diffusion is a process involving passive transport of particles from a region of higher concentration to a region of lower concentration.
What is passive transport?
Passive transport is the movement particles from one region to another region across a membrane that does not require the input of energy.
What is active transport?
Active transport is the movement particles from one region to another region across a membrane that requires the input of energy.
What is a solute?
A solute is a substance dissolved in another substance forming a solution. The solute is usually present in a smaller quantity than the solvent.
What is a solvent?
A solvent is the substance that acts to dissolve the solute, forming a solution. The solvent is usually present in a larger quantity than the solute.
What is a solution?
A solution is a homogeneous mixture of two or more substances with a uniform distribution of particles throughout the mixture.
How is the concentration of a solution measured?
The concentration of a solution is measured using a variety of units. Most common are percent by mass, percent by volume, and molarity. Molarity is defined as the number of moles of solute divided by the volume of the solution measured in liters.
What is a semipermeable membrane?
A semipermeable membrane is a membrane that only allows particles of a certain size or charge to pass through the membrane. Other particles are prevented from passing through the membrane.
What is the function of a cell membrane?
The membrane of a cell allows specific substances to enter and/or exit the cell.
What is glucose?
Glucose is a simple sugar consisting of a six-carbon compound that is a vital energy source to living organisms.
What is starch?
Starch is a carbohydrate consisting of many glucose units bonded using glycosidic bonds. Starch is produced by all green plants and is the main form of stored energy in plants. Certain organisms can digest starch and convert starch into glucose.
What is an indicator?
An indicator is a chemical substance that changes color under various conditions, such as when exposed to the presence of certain substances.
What is dialysis tubing?
Dialysis tubing is an artificial semipermeable membrane used to separate substances based on their permeability to the membrane.
What is equilibrium?
Equilibrium is a system state when the rate of the forward chemical reaction is equal to the rate of the reverse chemical reaction.
A semipermeable membrane like the one found in cells allows some materials to pass through the membrane while other substances are resisted from passing. Can you determine what factors impact this important process? Get started now with your investigation of diffusion through a membrane.
