Homework #12

ISBS #9-19 pg. 81-82:


9. 

.20 x 55 = 11

11g sugar.

55-11 = 44

44g water.

11g sugar, 44g water. 

10. 15,000ppm

11. When the oxygen atom is negatively charged and the hydrogen atoms are positively charged, a water molecule is polar. 

12. See drawing 

13. 

a. The negatively charged end, the oxygen end.

b. The positively charged end, the hydrogen end.

14. Because heavy metals carry atoms that have greater masses than essential metallic elements. 

15. Numbness, staggered walk, tunnel vision.

16. 

1) Soil surrounding heavily traveled roads, for it may have absorbed automobile exhaust from the gas from cars that contained tetraethyl lead before the 1970s.

2) Flaking leaded paint in houses built before 1978/.

b.

1) Thermometers and florescent light bulbs.

2) Fish exposed to mercury in the water. 

17. Hydroxide (OH-) is found in many bases.

18. Hydrogen.

19. 

a. basic.

b. basic.

c. acidic.

d. chemically neutral.