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9. on paper
10. on paper
11. A water molecule is polar if the oxygen end is electrically negative and has a greater concentration of electrons compared with the two hydrogen ends.
12. On paper
13. a. The negative region of a polar water molecule will be attracted to a K+ ion.
b. the positive region of a polar water molecule will be attracted to a Br- ion.
14. Heavy metals are called heavy because their atoms have greater masses than those of essential metallic elements.
15. Three symptoms of heavy metal poisoning are staggered walk, tunnel vision, and brain damage.
16. a. Two possible sources of human exposure to lead are the flaking of old leaded paint in homes built before 1978, and lead in the soil surrounding heavily traveled roads.
b. Two possible sources of human exposure to mercury are mercury-vapor street lamps, some paints, and other elemental mercury that can be absorbed directly through the skin.
17. Hydroxide ions are found in many bases.
18. Most acids are made up of molecules including one or more hydrogen atoms.
19. a. seawater- basic
b. drain cleaner- basic
c. vinegar- acidic
d. pure water- basic
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