Question

1. what is the main difference between a solution and a colloid? a) solutions scatter light; colloids do not b) solutions have particles smaller than 1 nanometer; colloids have particles between 1 and 1000 nanometers c) solutions can be separated by decanting; colloids cannot d) solutions are always gases; colloids are always liquids 4. which property distinguishes a suspension from other types of mixtures? a) particles are very tiny and invisible under a microscope b) it is physically stable and cannot be separated c) particles are large enough to settle over time and can be separated by decantation or centrifugation d) its composition is uniform throughout

Explanation:

• For question 3: Solutions have solute particles that are extremely small (less than 1 nm), while colloids have particles in the range of 1 - 1000 nm. Colloids scatter light (Tyndall effect) which solutions don't. Solutions can't be separated by decanting easily and both can be in various states.
• For question 4: In a suspension, particles are large enough to settle out over time and can be separated by processes like decantation or centrifugation. Suspension particles are visible under a microscope and it is physically unstable and non - uniform.

Answer:

1. B. Solutions have particles smaller than 1 nanometer; colloids have particles between 1 and 1000 nanometers
2. C. Particles are large enough to settle over time and can be separated by decantation or centrifugation