1. A Review Game for Unit 2 – Basic Chemistry

2. Rules Work together in teams to answer the following multiple choice questions. Each question is worth 1 point. Get an answer wrong and your team “gets a letter” to the word “J-A-C-K.” Spell the word JACK and your team is out and cannot earn more points – although you can keep answering questions. Continue to answer questions correctly and you can prove that you DO know Jack! All questions have been taken from the test.

3. What is measured by the pH scale? A. concentration of hydrogen ions in a solution B. concentration of hydroxide ions in a solution C. amount of phosphorus in a compound D. weight of hydrogen gas 1 1

4. The atomic number of an atom is equal to the number of ______________ in its nucleus. A. orbitals B. protons C. neutrons D. energy levels 2 2

5. In water, when a positively charged region (δ+) of one water molecule is attracted to the negatively charged region (δ-) of a nearby water molecule a(n) _____________ forms. A. ionic bond B. covalent bond C. polar bond D. hydrogen bond 3 3

6. Atoms of the same element that have different numbers of neutrons in their respective nuclei are called _________. A. ions B. isotopes C. solutes D. isomers 4 4

7. How many more H + ions are in a solution with a pH of 4 than a pH of 7? A. 3 B. 10 C. 100 D. 1000 5 5

8. A _______ is a pure substance that cannot be broken down chemically into simpler kinds of matter. A. compound B. ion C. mixture D. element 6 6

9. Electrons… A. have more mass than protons. B. can be found in a cloud around the nucleus. C. have no charge. D. are attracted to the neutrons in an atom. 7 7

10. The number of protons in an atom added to the number of neutrons in the atom will give you the atom’s _________. A. atomic number. B. mass number. C. average atomic weight. D. charge. 8 8

11. The atomic number of sodium is 11. How many electrons are in its valence energy level? A. 1 B. 3 C. 8 D. 11 9 9

12. Which of the following is not a major element in the human body? A. calcium B. carbon C. iron D. phosphorus 10

13. When a flourine atom accepts an electron from another atom, it… A. becomes a positive ion. B. forms a covalent bond. C. becomes neon. D. completes, or fills, its valence energy level. 11

14. Water is a(n) ________ compound because the oxygen and hydrogen atoms do not share electrons evenly. A. ionic B. polar covalent C. neutral D. dysfunctional 12

15. Which of the following is NOT an example of water’s adhesion. A. Water moving along a soaked string. B. A meniscus in a graduated cylinder C. Water moving up the stem of a plant D. Fitting 25 drops on the head of a penny 13

16. A ________ is a combination of two or more substances in which each substance retains its individual characteristics and properties. A. compound B. molecule C. mixture D. element 14

17. Which of the following is true of a solution? A. It will scatter a laser beam. B. It is a heterogeneous mixture. C. It is a uniform mixture. D. Its components can be separated using a filter. 15

18. Which of the following is a colloid? A. blood B. sugar water C. muddy water D. oil & vinegar 16

19. Any substance that releases OH - ions when it is mixed with water is considered to be a(n)… A. acid B. base C. buffer D. neutral substance 17

20. Covalent bonds… A. transfer electrons. B. are the strongest types of bonds. C. usually occur between metals. D. are attractions between ions of opposite charges. 18

21. The gastric fluids in your stomach have a pH of about 2. Which of the following would be the best buffer for these fluids? A. a strong acid B. a weak acid C. a weak base D. a strong base 19

22. Hydrogen bonding is the reason for all of the following properties of water except… A. water has a high specific heat. B. coastal areas have moderate climates. C. evaporative cooling. D. water is transparent. 20