Question

Which of the following best describes diffusion?

Select one:
a. Molecules are somehow directed or "want to move to where there is less space so move from areas of low concentration to higher concentration
b Groups of molecules tend to spread out over time, but individual molecules are in constant random motion and are equally likely to move in any direction. This constant random motion eventually results in substances moving from area of lower concentration to higher concentration
c Groups of molecules tend to spread out over time, but individual molecules are in constant random motion and are equally likely to move in any direction. This constant random motion eventually results in substances moving from area of higher concentration to lower concentration.
d. Molecules are somehow directed or want to move to where there is more space so move from areas of high concentration to lower concentration

Answer 1

Diffusion is when molecules move from an area of higher concentration to one of lower concentration, due to their random motion, until the concentration becomes equal.

Step-by-step explanation:

The correct answer to which statement best describes diffusion is: Groups of molecules tend to spread out over time, but individual molecules are in constant random motion and are equally likely to move in any direction. This constant random motion eventually results in substances moving from an area of higher concentration to lower concentration. Diffusion is accurately described as the movement of molecules from an area with a higher concentration to one with a lower concentration due to the random movement of molecules. This continues until there is an equal distribution of molecules throughout, reaching a dynamic equilibrium. It is a passive process that does not require energy as it is driven by the kinetic energy of molecules. Common examples include the spreading of odors through the air or the dispersal of nutrients from the blood to tissue cells.