What term best describes a colloid according to the material?

• A. Glue
• B. Salt
• C. Water
• D. Sugar

Answer: (A)

Understanding colloids means recognizing mixtures where the dispersed particles are larger than molecules but too small to settle out quickly, often giving a cloudy or gel-like texture. Glue is a classic everyday example: the polymer particles are dispersed in water and form a sticky suspension rather than a true solution. In a true solution, like salt or sugar in water, the solute dissolves completely and the mixture is homogeneous, with no dispersed particles to scatter light. Water alone is just the solvent, not a mixture. So glue best fits the description of a colloid among these options because it shows dispersion of particles in a medium without dissolving, matching the colloidal nature.