9. 11 grams of sugar, 44 grams of water
10. 15, 000 ppm
11. What makes a water molecule polar is that oxygen is more electronegative than is hydrogen; thus, electrons are partially pulled away from the two hydrogen atoms toward the oxygen atom. This results in a polar molecule.
12.
13. a. Oxygen molecule
b. Hydrogen molecules
14. Heavy metals are called heavy are because their atoms have greater masses than those of essential metallic elements.
15. The effects of heavy-metal poisoning are damage to the nervous system, brain, kidneys, and liver, which can even lead to death.
16. Lead: in paint, cooking vessels
Mercury: "silent" light switches, medical and weather thermometers
17. Sodium hydroxide is found in many bases.
18. Most acids are made up of molecules including one or more hydrogen atoms.
19. a. basic
b. basic
c. acidic
d. chemically neutral
No comments:
Post a Comment