A.P_Chapter_2_3_Test - A.P. Biology: Chapter 2 & 3 Test...

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Multiple Choice Identify the choice that best completes the statement or answers the question. 1. When two atoms are equally electronegative, they will interact to form a. equal numbers of isotopes. d. nonpolar covalent bonds. b. ions. e. ionic bonds. c. polar covalent bonds. 2. A covalent bond is likely to be polar when a. one of the atoms sharing electrons is much more electronegative than the other atom. b. the two atoms sharing electrons are equally electronegative. c. the two atoms sharing electrons are of the same element. d. it is between two atoms that are both very strong electron acceptors. e. the two atoms sharing electrons are different elements. 3. Which of the following is possible due to the high surface tension of water? a. Lakes don't freeze solid in winter, despite low temperatures. b. A water strider can walk across the surface of a small pond. c. Organisms resist temperature changes, although they give off heat due to chemical reactions. d. Water can act as a solvent. e. The pH of water remains exactly neutral. 4. Many mammals control their body temperature by sweating. Which property of water is most directly responsible for the ability of sweat to lower body temperature? a. water's change in density when it condenses b. water's ability to dissolve molecules in the air c. the release of heat by the formation of hydrogen bonds d. the absorption of heat by the breaking of hydrogen bonds e. water's high surface tension 5. In a single molecule of water, the two hydrogen atoms are bonded to a single oxygen atom by a. hydrogen bonds. d. ionic bonds. b. nonpolar covalent bonds. e. van der Waals interactions. c. polar covalent bonds. 6. An element is to a (an) ____ as an organ is to a (an) ____. a. atom; organism d. atom; cell b. compound; organism e. compound; organelle c. molecule; cell 7. One difference between carbon-12 and carbon-14 is that carbon-14 has a. two more protons than carbon-12. b. two more electrons than carbon-12. c. two more neutrons than carbon-12. d. A and C only e. B and C only 8. Results from a transfer of electron(s) between atoms. a. nonpolar covalent bond d. hydrogen bond b. polar covalent bond e. hydrophobic interaction
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c. ionic bond 9. Which of the following solutions has the greatest concentration of hydroxide ions [OH - ]? a. lemon juice at pH 2 d. urine at pH 6 b. vinegar at pH 3 e. seawater at pH 8 c. tomato juice at pH 4 10. The mass number of an element can be easily approximated by adding together the number of ____ in an atom of that element. a. protons and neutrons d. neutrons and electrons b. energy levels e. isotopes c. protons and electrons 11. Life on Earth is dependent on all the properties of water as well as the abundance of water. Which property of water is probably the MOST important for the functioning of organisms at the molecular level? a.
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A.P_Chapter_2_3_Test - A.P. Biology: Chapter 2 & 3 Test...

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