Homework #5 week two

1. .20 x 55.0 = 11grams of sugar 44 grams of water
2. 0.015mg/L = 150 ppm
3. A water molecule is polar because it has a negative charge on one side (the oxygen side) and a positive charge on the other side (the hydrogen side).
4. On paper
5. The region of polar water molecules that will be attracted to a
1. K⁺ ion is the negative oxygen side
2. Br^- ion is the positive hydrogen side
6. Heavy metals are called heavy because their atoms have bigger masses than the other essential metal elements; they are harmful to humans and other organisms because they bind to proteins in biological systems and prevent the proteins from doing their jobs.
7. Three symptoms of heavy metal poisoning: nervous system damage, kidney failure, and brain damage.
8. Two possible sources of human exposure to
1. Lead- Through old gasoline fumes, which used to contain tetraethyl lead, and through flaking paint from houses that were built in the 70s or earlier.
2. Mercury- Through mercury vapor from a cracked fluorescent light, which is extremely harmful; mercury is used because it is a great electrical conductor. Another source of human exposure to mercury is through a broken mercury thermometer.
9. The ion found in many bases is hydroxide (OH^-) and the bases that do not have hydroxide in them usually produce the ion when they react with water.
10. The element found in most acids is hydrogen (H) that can be released very easily in water solution.
11. Classify each sample as acidic, basic, or chemically neutral:
1. Seawater with a pH = to 8.6 is basic
2. Drain cleaner with a pH = to 13.0 is extremely basic
3. Vinegar with a pH = to 2.7 is very acidic
4. Pure water with a pH = to 7.0 is neutral