Question

Question 1 : Which of the following descriptions is correct?
a mixture consists of two or more pure substances which can only be separated by chemical methods
a colloid is a 'cloudy' mixture containing particles which will not easily settle out when the colloid is left standing
a suspension contains particles which will not settle out if the suspension is left standing
a solution consists of a solvent dissolved in a solute

Answer 1

In contrast to the coarse particle systems (suspensions, emulsions, foams, etc.), particle size which is typically less than 10 -4 cm colloidal particles involved in an intense Brownian movement and not sedymentuyut field force of gravity. Because colloidal mixture contains particles that will not easily subside.

Answer: a colloid is a "cloudy" mixture containing particles which will not easily settle out when the colloid is left standing.