Which statement is true regarding colloidal particles?

Which statement is true regarding colloidal particles?

• A. They are easily settled by gravity.
• B. They are affected greatly by temperature changes.
• C. Gravity has little effect on them.
• D. They are always positively charged.

Answer: (C)

Colloidal particles are small enough that they do not easily settle out of a solution under the influence of gravity. This behavior is due to their size, which typically ranges from 1 nanometer to 1 micrometer. Because of this small size, the movement of colloids is largely influenced by Brownian motion and other forces at the microscopic level rather than gravitational forces. As a result, colloidal suspensions can remain stable for long periods without sedimentation. The other statements do not accurately describe colloidal particles. While temperature can affect the properties of the solution, it does not have a significant direct effect on the settling behavior of colloidal particles. Not all colloidal particles are charged, and those that are can carry either a positive or negative charge, but they are not always positively charged.

Colloidal particles are small enough that they do not easily settle out of a solution under the influence of gravity. This behavior is due to their size, which typically ranges from 1 nanometer to 1 micrometer. Because of this small size, the movement of colloids is largely influenced by Brownian motion and other forces at the microscopic level rather than gravitational forces. As a result, colloidal suspensions can remain stable for long periods without sedimentation.

The other statements do not accurately describe colloidal particles. While temperature can affect the properties of the solution, it does not have a significant direct effect on the settling behavior of colloidal particles. Not all colloidal particles are charged, and those that are can carry either a positive or negative charge, but they are not always positively charged.