Answer:

6-7. A pure substance is made up solely of that substance and can't be separated into any other substances. A mixture can be separated into two or more pure substances.

8-11. chromatography: Involves solvent separation on a solid medium.

distillation: Takes advantage of differences in boiling points.

evaporation: Removes a liquid from a solution to leave a solid material.

filtration: Separates solids of different sizes. References.

12-13. Examples of pure substances include tin, sulfur, diamond, water, pure sugar (sucrose), table salt (sodium chloride) and baking soda (sodium bicarbonate). Crystals, in general, are pure substances. Tin, sulfur, and diamond are examples of pure substances that are chemical elements. All elements are pure substances.

14-15. Sand and water, Salt and water, Sugar and salt, Ethanol in water, Air.