10) 15,000 ppm.
11) A water molecule is polar because one end is positively charged (hydrogen) and the other is negatively charged (oxygen) causing them to attract.
12)
13)
a. The negative end, which is oxygen.
b. The positive end, which is hydrogen.
14) Heavy metal are called heavy because their atoms have greater masses than those of essential metallic elements.
15) 3 symptoms include: staggered walk, brain damage, and numbness.
16)
a1. In soil surrounding heavily traveled roads.
a2. In flaking old paint found in houses built before 1978.
b1. In "silent" light switches.
b2. In medical and weather thermometers.
17) Hydroxide is found in many bases.
18) Hydrogen is found in many acids.
19)
a. basic
b. basic
c. acidic
d. nuetral
20)
a. Soft drink
b. Black coffee
c. Milk of magnesia
21) 2 times more acidic.
22)
1. Fish-egg development is impaired.
2. Increase the concentrations of metal ions in naturals waters, some which can be toxic to fish.
3. Dissolve organic materials, including skin and scales.
23) Polar molecules have a assymetrical distribution of electical charges, one end positive and the other negative while nonpolar molecules are distributed more symmetrically.
24) I would select lamp oil because it is a non-polar solvent and non polar substances dissolve better in non-polar solvents.
25) NaCl dissolves in water and not in oil because NaCl is polar and so is water which causes it to dissolve however oil is nonpolar which doesn't cause it to dissolve.
26) Polar substances dissolve in polar solvents, nonpolar substances dissolve in nonpolar solvents.
27) Since water is polar and grease, or oil, is nonpolar, water would not be able to dissolve the grease on the dishes.
33)
a. Nonpolar materials are likely to be found in these cleaners.
b. Because water wouldn't dissolve the grease off your hands, while a cleaner with nonpolar materials would because they could dissolve the grease since it is also nonpolar.
35) I would expect hydrogen to have a partial positive charge because it has less electrons, or negative charges, then flourine does.
No comments:
Post a Comment