Homework 6/29

Page 82 #20-27 33,35

20. A) Soft drinks

      B) Black coffee

      C) Milk of magnesia

21.  It is 20 times more acidic

22. 3 negative effects: Fish egg development can become decreased; the alkaline solutions can dissolve natural materials, and high concentrations of metal ions.

23. A polar solute cannot dissolve in a nonpolar solvent, and vice versa, this is known as “like dissolves like”.  Polar molecules have an uneven distribution of electrical charges, but nonpolar molecules have an even distribution.

24.  I would select lamp oil because it is nonpolar and nonpolar molecules are do not dissolve well in ethanol or water.

25. Table salt (NaCl) will dissolve in water but not in cooking oil because NaCl is polar, and therefor cannot dissolve in oil.

26. The term "like dissolves like" means that polar solutes dissolve in polar solvents, and nonpolar solutes dissolve in nonpolar solvents. This is explaining that polar opposites do not always attract.

27. You cannot satisfactorily clean greasy dishes with just plain water because water and oil are polar opposites, and cannot be mixed. Grease is nonpolar, and water is polar.

33. A) Nonpolar substances such as milk of magnesia

B) It is more effective because these substances mix well with oil and can remove the grease from the dishes.

35. Hydrogen would have a higher positive charge because fluorine has the highest electronegativity charge out of all the elements.