Potassium chloride has a solubility of 43 g of $\mathrm{KCl}$ in 100 g of $\mathrm{H_2O}$ at 50 $\dedgree$C. Determine if adding 86 g of $\mathrm{KCl}$ to 150. g of $\mathrm{H_2O}$ forms an unsaturated or saturated solution at 50 $\dedgree$C.

Indicate whether each of the following descriptions concerning the molecule sphingosine is true or false.

a. Carbons 1, 2, and 3 all bear the same kind of functional group.

b. Three different kinds of functional groups are present.

c. It is an unsaturated diaminoalcohol.

d. The carbon chain contains 20 carbon atoms.

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.

Draw the formula of an unsaturated bromide, $\mathrm{C}_5 \mathrm{H}_9 \mathrm{Br}$, that can show a. neither cis-trans isomerism nor optical activity. b. cis-trans isomerism but no optical activity. c. no cis-trans isomerism but optical activity. d. cis-trans isomerism and optical activity.

With the help of Figure 17.8, indicate whether the ring system in each of the following heterocyclic amines is (1) saturated (2) unsaturated or (3) fused. More than one choice may be correct for a given heterocyclic amine.

a. Pyrrolidine

b. Imidazole

c. Pyridine

d. Quinoline

Which statement about unsaturated fats is true?

(A) They are more common in animals than in plants.

(B) They have double bonds in their fatty acid chains.

(C) They generally solidify at room temperature.

(D) They contain more hydrogen than do saturated fats having the same number of carbon atoms.

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 aadding 68 g of $\mathrm{KNO_3}$ to 150. g ofv$\mathrm{H_2O}$ forms an unsaturated or saturated solution at 20 $\degree$C.

Lithium chloride has a solubility of 55 g of LiCl in 100 g of $\mathrm{H_2O}$ at 25 $\degree$C. Determine if adding 75 g of LiCl to 150. g of $\mathrm{H_2O}$ mixtures forms an unsaturated or saturated solution at 25 $\degree$C.

The following pictures represent solutions of $\mathrm{AgCl}$, which also may contain ions other than $\mathrm{Ag}^{+}$and $\mathrm{Cl}^{-}$that are not shown. If solution 1 is a saturated solution of $\mathrm{AgCl}^2$, classify solutions 2-4 as unsaturated, saturated, or supersaturated.

$$-\mathrm{A}_{\mathrm{B}}+\mathrm{C}-\mathrm{Cl}^{-}$$

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.

With the help of Figure 17.8, indicate whether the ring system in each of the following heterocyclic amines is (1) saturated (2) unsaturated or (3) fused. More than one choice may be correct for a given heterocyclic amine.

a. Pyrrole

b. Indole

c. Pyrimidine

d. Purine

How are membranes of winter wheat able to remain fluid when it is extremely cold?

A) increasing the proportion of unsaturated phospholipids in the membrane

B) decreasing the percentage of cholesterol molecules in the membrane

C) decreasing the number of hydrophobic proteins in the membrane

D) increasing the proportion of glycolipids in the membrane

E) there is more than one correct answer choice

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.

To bring the typical diet more in line with the recommended diet, people should A. cut their intake of unsaturated fats by one half. B. cut their intake of saturated fats by two thirds. C. cut their protein intake in half. D. double their carbohydrate intake.