Download Summary C Questions

Summary C Questions
1.
2 grams
1 milliliter
=
X grams
946 ml
X = 1892 grams
2. Because as temperature increases, the solubility of a solid
increases also.
3. a. NaCl, KCl, KNO3
b. KNO3, KCl, NaCl
4.
35 grams of EtOH
35 g + 115 g
=
X grams
100 g of solution
X = 23 grams of EtOH in 100 g of solution
5. 55 grams X 20% = 55 g X .20 = 11 g sugar
55 g - 11g = 44 g of water
6. a. about 32 grams
b. about 45 grams of KNO3 will dissolve, so it’s
supersaturated
c. At 75oC, 150 g of KNO3 will dissolve; at 40 oC, about 60
g will dissolve, then 150- 60 = 90 g of precipitate
7.
8. NaCl is composed of ions. Polar water molecules are
attracted to these charged particles. Cooking oil is
nonpolar. There will be no attraction between the cooking
oil and ions.
9. Metallic elements such as lead, mercury, cadmium, that
are heavier than the essential elements. Heavy metals
dissolve in water as ions. Small amounts are toxic to
humans and accumulate in the body.
10. Sources include: gasoline fumes, old mine sites,
tobacco smoke, streams polluted by industrial waste,
contaminated fish and foods. Mercury enters the aquatic
food chain through bacteria.
11. Galvanized pipes, discarded paint, batteries, solder,
land fill cover, pesticides, etc
12. a. basic
b. basic
13. soft drink
14. 100 times – 10 x 10
c. acidic d. neutral
15. Lamp oil is nonpolar, which will dissolve another
nonpolar substance
16. Helps to determine solubility. Polar substances dissolve
other polar substances and ionic compounds. Nonpolar
substances dissolve other like nonpolar substances
17. Water molecules are polar, grease is nonpolar
18. Increased pressure increases the amount of gas
dissolved in body fluids
19. The solubility of CO2 gas, the fizz in soda, increases as
the temperature decreases and decreases as the
temperature increases. This assumes that the pressure on
both is the same.
20. The slightly polar structure of the alcohol encourages the
molecules to be closer together or overlap, forming a product
that is denser and liquid
21. The alcohol would be very soluble in water due to the
polar nature of the molecule, and the gas would be less
soluble
22.
a. Water in rapids has more opportunity to mix with the air
b. In spring the lake is colder, increasing the solubility of
oxygen
c. Overall, pike require more oxygen than sunfish to survive,
so “pike lake” probably has more dissolved oxygen.