PracticeExam1

PracticeExam1 - Practice for the first hourly examination...

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Practice for the first hourly examination in BISC 220 January 2006 Answers are given for about half of the questions. Answers to the remaining questions are available in the text. The following 28 multiple choice questions are worth 3 points each. Please CLEARLY write your answer in the left hand margin box. 1. Using the information in the abbreviated periodic table ( above ), how many neutrons does the nucleus of a nitrogen atom contain? a. 2 b. 7 c. 8 d. 14 e. 21 2. When two atoms are equally electronegative, they will interact to form a. equal numbers of isotopes. b. ions. c. polar covalent bonds. d. nonpolar covalent bonds. e. ionic bonds. 3. What do cohesion, surface tension, and adhesion have in common with reference to water? a. All increase when temperature increases. b. All are produced by covalent bonding. c. All are properties related to hydrogen bonding. d. All have to do with nonpolar covalent bonds. e. Both A and C are correct. 4. The figure above shows a solute molecule surrounded by a hydration shell of water. Based on your knowledge of the polarity of water, the solute molecule is most likely a. positively charged. b. negatively charged. c. neutral in charge. d. hydrophobic. e. nonpolar. 5. Assume that acid rain has lowered the pH of a particular lake to pH 5.0. What is the hydroxide ion concentration of this lake? a. 1 x 10 -5 mol of hydroxide ion per liter of lake water b. 1 x 10 -9 mol of hydroxide ion per liter of lake water c. 5.0 M with regard to hydroxide ion concentration d. 9.0 M with regard to hydroxide ion concentration e. Both B and D are correct.
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6. Air temperature often increases slightly as clouds begin to drop rain or snow. Which behavior of water is most directly responsible for this phenomenon? a. water's change in density when it condenses b. water's reactions with other atmospheric compounds c. release of heat by the formation of hydrogen bonds d. release of heat by the breaking of hydrogen bonds e. water's high surface tension 7. Recent research suggests that side effects from Ritalin, the drug used to treat attention deficit disorder, may be caused by contamination of enantiomers, or molecules that a. have identical three-dimensional shapes. b. are mirror images of one another. c. lack an asymmetric carbon. d. differ in the location of their double bonds. e. differ in their electrical charge. 8. Consider the molecules given above . Which molecule contains a group that functions to transfer energy between organic molecules? 9. Which of the following best summarizes the relationship between dehydration reactions and hydrolysis? a. Dehydration reactions assemble polymers, and hydrolysis breaks them down.
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This note was uploaded on 10/25/2010 for the course BISC 220L taught by Professor Herrera,mcclure during the Spring '07 term at USC.

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PracticeExam1 - Practice for the first hourly examination...

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