Chapter 2 quiz

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

a

12. When dissolved in water, a(n) donates h+ ; a(n) accepts h+ . a. acid; base b. base; acid c. buffer; solute d. base; buffe

a

5. All ions have at least one (select all that are correct). a. proton b. neutron c. electron d. all of the above

a

7. The mutual attraction of opposite charges holds atoms together as molecules in a(n) bond. a. ionic b. hydrogen c. polar covalent d. nonpolar covalent

a

6. Rank the following chemical bonds in order of increasing polarity. a. nonpolar covalent b. ionic c. polar covalent

a,c,b

10. A salt does not release in water. a. ions b. h+

b

14. A is dissolved in a solvent. a. molecule b. solute c. salt d. radioisotope

b

2. A molecule into which a radioisotope has been incorporated can be used as a(n) . a. compound b. tracer c. salt d. acid

b

13. A(n) can help keep the pH of a solution stable. a. covalent bond b. hydrogen bond c. buffer d. free radical

c

8. Atoms share electrons unequally in a(n) bond. a. ionic b. hydrogen c. polar covalent d. nonpolar covalent

c

9. A(n) substance repels water. a. acidic b. basic c. hydrophobic d. polar

c

15. hydrophilic atomic number hydrogen bonds positive charge temperature negative charge _________________________ a. protons > electrons b. number of protons in nucleus c. polar; dissolves easily in water d. collectively strong e. protons < electrons f. of molecular motion d. radioisotope

c, b, d, a, f, e

11. Hydrogen ions are . a. in blood b. protons c. indicated by a pH scale d. all of the above

d

3. Which of the following statements is incorrect? a. Isotopes have the same atomic number and different mass numbers. b. Atoms have about the same number of electrons as protons. c. All molecules consist of atoms. d. Free radicals are dangerous because they emit energy

d

4. In the periodic table, symbols for the elements are arranged according to . a. size b. charge c. mass number d. atomic number

d