Chapter 2, Problem 4RQ

What atom has only one proton? a. hydrogen c. a free radical b. an isotope d. a radioisotope

An isotope of sodium (Na) has a mass number of 22. How many neutrons does it have? a. 11 b. 12 c. 22 d. 44

What kinds of bonds often control the shape (or tertiary form) of large molecules such as proteins? a. hydrogen b. ionic c. covalent d. inert e. single

Alchemists were the forerunners of modern-day chemists. Many of these medieval scholars and philosophers spent their lives trying to transform lead (atomic number 82) into gold (atomic number 79). Explain why they never succeeded.

Which of the following statements is not true? a. Water is polar. b. Water stabilizes temperature. c. Water is essential for life. d. Water is the most abundant atom in Earth’s atmosphere.

In ________ reactions, small molecules are linked by covalent bonds, and water can also form. a. hydrophilic b. hydrolysis c. condensation d. ionic

A carbon atom can form up ________ to bonds with other atoms. a. four b. six c. eight d. sixteen

Which type of bond represents a weak chemical bond? a. hydrogen bond b. ionic bond c. covalent bond d. polar covalent bond

Atoms share electrons unequally in an _______ bond. a. ionic c. polar covalent b. hydrogen d. nonpolar covalent