9. 11 grams of sugar and 44 grams of water.
10. 15,000 ppm
11. A water molecule is polar if its hydrogen atoms are positive and its oxygen atom is negative. It is both positive and negative, resulting in in overall being neutral.
12. See paper
13.
a. K+: the negative side of the oxygen atom
b. Br-: the positive side of the hydrogen atoms
14. Heavy metals are called "heavy" because their masses are heavier than the masses of the essential metallic elements.
15. Brain damage, numbness, and staggered walk.
16.
a. lead: You can be exposed to lead if your house has been painted in the 1970s and has not been updated since.
b. mercury: You can be exposed to mercury by eating certain types of fish and shellfish.
17. Hydroxide ions are found in many bases.
18. Hydrogen is found in most acids.
19.
a. seawater: basic
b. drain cleaner: basic
c. vinegar: acidic
d. pure water: neutral
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