Use the previous table to determine whether each of the following solutions will be saturated or unsaturated at $20^{\circ} \mathrm{C}$ :

a. Adding 25 g of KCl to 100 g of $\mathrm{H}_2 \mathrm{O}$

b. Adding 11 g of $\mathrm{NaNO}_3$ to 25 g of $\mathrm{H}_2 \mathrm{O}$

c. Adding 400 g of sugar to 125g of $\mathrm{H}_2 \mathrm{O}$

Classify each of the following solutions as saturated, unsaturated, or supersaturated based on the following observations made after adding a small piece of solid solute to the solution. a. The added solute rapidly dissolves. b. The added solute falls to the bottom of the container where it remains without any decrease in size. c. The added solute falls to the bottom of the container where it decreases in size for several hours and there-after its size remains constant. d. The added solute causes the production of a large amount of solid white crystals.

What is the correct formula for gold (III) nitride?

Is acetic acid (C$_2$H$_4$O$_2$) a weak electrolyte?

Calculate the $\ce{[OH−]}$ of each aqueous solution with the following $\ce{[H3O+]}$:

• A. coffee, $\ce{1.2 \times 10^{-5} M}$
• B. soap, $\ce{1.2 \times 10^{-8} M}$
• C. cleanser, $\ce{5.0 \times 10^{-10} M}$
• D. lemon juice, $\ce{2.6 \times 10^{-2} M}$

Express in two significant figures.

Water is a polar solvent and carbon tetrachloride $\left(CCl_4\right)$ is a nonpolar solvent. In which solvent is each of the following, which is found or used in the body, more likely to be soluble? sucrose (table sugar), polar

At STP what is the volume of 4.50 moles of nitrogen gas?

• a) 167 L
• b) 3420 L
• c) 101 L
• d) 60.7 L

Which one of the following is characteristic of a base?

• a) produces H$_3$O$^+$ in water
• b) has a sour taste
• c) has a slippery, soapy feel
• d) turns blue litmus red
• e) is insoluble in water

Calculate the final pressure, in millimeters of mercury, for a gas with an initial pressure of 1200 Torr at 155 degree Celsius is cooled to 0 degrees Celsius, if n and V do not change.

A solution containing $86.6$ grams of KCl in $200$ grams of $\ce{H_2O}$ at $\ce{50 \degree C}$ is cooled to $\ce{20 \degree C}$.

a. How many grams of $\ce{KCl}$ remain in solution at $\ce{20 \degree C}$?

b. How many grams of solid $\ce{KCl}$ came out of solution after cooling?

Which of the following components of a tossed salad will pass through the human digestive tract and be digested the least?

A. protein (in the bacon bits)

B. cellulose (in the lettuce)

C. starch (in the croutons)

D. sugar (in the dressing)

E. oil (in the dressing)

Explain why a lettuce leaf in contact with salad dressing containing salt and vinegar soon becomes wilted and limp whereas another lettuce leaf in contact with plain water remains crisp.

Why do lettuce leaves in a salad wilt after a vinaigrette dressing containing salt is added?

Is the distilled $\mathrm{H_2O}$ solution isotonic, hypotonic, or hypertonic compared with a red blood cell?