Potassium chloride has a solubility of 43 g of KCl in 100 g of H2O at 50 $\degree$ C. Determine if adding 15 g of KCl to 25 g of $\mathrm{H_2O}$ forms an unsaturated or saturated solution at 50 $\degree$ C.

Identify which of the following statements applies to tristearin: (a) It is a solid at room temperature. (b) It is unreactive toward molecular hydrogen in the presence of Ni. (c) It undergoes hydrolysis to produce unsaturated fatty acids. (d) It is a complex lipid. (e) It is a wax. (f) It has a phosphate group.

Cis versus trans. Why might most unsaturated fatty acids in phospholipids be in the cis rather than the trans conformation? D raw the structure of a 16-carbon fatty acid as Ca) saturated. (b) trans monounsaturated. and (c) cis monounsaturated.

The solubility of rock salt is $40$g/$100$ g water at $30$ $\degree$C.If a solution contains $10$ g of rock salt in $25$ g of water at $30$ $\degree$C, is the solution saturated, unsaturated, or supersaturated?

Which of the following factors would tend to increase membrane fluidity?

1. A greater proportion of unsaturated phospholipids
2. A relatively high protein content in the membrane
3. A greater proportion of saturated phospholipids
4. A lower temperature

Which of the following factors would tend to increase membrane fluidity?

a. A greater proportion of unsaturated fatty acids.

b. A greater proportion of saturated fatty acids.

c. Lowering the temperature.

d. A relatively high protein content in the membrane.

Cooking oil lipids consist of long, unsaturated hydrocarbon chains. Would you expect these molecules to form membranes spontaneously? Why or why not? Describe, on a molecular level, how you would expect these lipids to behave in water.

How concentrated is a solution containing $130$ g of NaC$_{2}$H$_{3}$O$_{2}$ in $100$ g water at $90$ $\degree$C?

(a) unsaturated

(b) saturated

(c) supersaturated

(d) superunsaturated

(e) none of the above

Potassium nitrate has a solubility of 32 g of $\mathrm{KNO_3}$ in 100 g of $\mathrm{H_2O}$ at 20 $\degree$C. Determine if adding 19 g of $\mathrm{KNO_3}$ to 50. g of $\mathrm{H_2O}$ forms an unsaturated or saturated solution at 20 $\degree$C.

Potassium fluoride has a solubility of 92 g of KF in 100 g of $\mathrm{H_2O}$ at 18 $\degree$C. Determine if adding 145 g of KF to 150. g of $\mathrm{H_2O}$ mixtures forms an unsaturated or saturated solution at 18$\degree$C.

Caffeine is about 10 times as soluble in hot water as in cold water. A chemist puts a hot-water extract of caffeine into an ice bath, and some caffeine crystallizes. Is the remaining solution saturated, unsaturated, or supersaturated?

Complete the table about lipids.\

Potassium fluoride has a solubility of 92 g of KF in 100 g of $\mathrm{H_2O}$ at 18 $\degree$C. Determine if adding 35 g of KF to 25 g of $\mathrm{H_2O}$ mixtures forms an unsaturated or saturated solution at 18 $\degree$C.

A solution of $20.0 \mathrm{~g} \mathrm{KClO}_4$ in $500.0 \mathrm{~g}$ of water is brought to a temperature of $40^{\circ} \mathrm{C}$.
(a) Refer to Figure 14-10 and determine whether the solution is unsaturated or supersaturated at $40^{\circ} \mathrm{C}$.