2. Two ways to express solution concentrations are 1-percentage by volume and 2-___________________.

3. Less surface area will ____________________________________ the rate of dissolving.

4. Solutions are classified into three types according to ____________________________________.

5. ______________________________________ protect people by controlling use of building materials.

6. Some polar compounds ionize when dissolved in water and produce ___________________________.

7. Electrolytes are solutions that _______________________________________.

8. Adding a solute to a solvent _______________________________________ its freezing point.

9. For example, a polar solute like sugar will dissolve in a polar solvent like __________________________.

10. In a ____________________ solution, if any solute is then added, the extra dissolved solute will fall out.

11. The _____________________________________ is the substance being dissolved.

12. An unsaturated solution is usually ______________________________ so that it can hold more solute.

13. Many materials used for building or furnishing homes are potentially harmful _____________________.

14. Usually, among polar and nonpolar solvents and solutes, ___________________________________.

15. The _______________________________________ is the substance that the solute is dissolving into.

16. More stirring will _______________________________________ the rate of dissolving.

17. _______________ of a substance tells how much of it will dissolve in 100g of solvent at a temperature.

18. A ______________________ solution holds all of the solute that it can possibly hold at that temperature.

19. Ionic compounds ________________ when dissolved in water (the positive and negative ions separate).

20. ____________________ occurs when constantly moving solvent molecules attract particles of solute 
        and surround them with solvent.