Which of the following is a hydrophobic material?

a. Paper

b. Table salt

c. Wax

d. Sugar

We can be sure that a mole of table sugar and a mole of vitamin C are equal in their

a. Mass

b. Volume

c. Number of atoms

d. Number of molecules

Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration of the lake?

a. 4.0 M

b. 10¹⁰ M

c. 10⁴ M

d. 10⁴M

What is the hydroxide ion concentration of the lake described in question 3?

a. 10⁻¹⁰ M

b. 10⁻⁴ M

c. 10⁻⁷ M

d. 10.0 M

A slice of pizza has 500 kcal. If we could burn the pizza and use all the heat to warm a 50-L container of cold water, what would be the approximate increase in the temperature of the water? (Note: A liter of cold water weighs about 1 kg.)

a. 50°C

b. 5°C

c. 100°C

d. 10°C

Draw the hydration shells that form around a potassium ion and a chloride ion when potassium chloride (KCl) dissolves in water. Label the positive, negative, and partial charges on the atoms.