PracticeExam1 - Fall 2008 BIO 202 Practice Midterm Exam 1...

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Fall 2008 BIO 202 Practice Midterm Exam 1 P a ge 1 1) What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons? a) 18 b) +1 c) 12 d) 8 e) 6 2) A(n) ________ refers to two or more atoms held together by covalent bonds. a) ion b) shell c) community d) isotope e) molecule 3) In salt, what is the nature of the bond between sodium and chlorine? a) nonpolar covalent b) ionic c) hydrophobic d) hydrogen e) polar covalent 4) What name is given to the bond between water molecules? a) hydrogen b) ionic c) nonpolar covalent d) hydrophobic e) polar covalent 5) Compared to 31 P, the radioactive isotope 32 P has a) one more electron. b) a different atomic number. c) a different charge. d) one more neutron. e) one more proton. 6) The reactivity of an atom arises from a) the potential energy of the valence shell. b) the energy difference between the s and p orbitals. c) the existence of unpaired electrons in the valence shell. d) the average distance of the outermost electron shell from the nucleus. e) the sum of the potential energies of all the electron shells. 7) Which of these statements is true of all anionic atoms? a) The atom has more electrons than protons. b) The net charge is 1-. c) The atom has more neutrons than protons. d) The atom has more protons than electrons. e) The atom has fewer protons than does a neutral atom of the same element. 8) In the term trace element, the modifier trace means a) the element can be used as a label to trace atoms through an organism's metabolism. b) the element passes rapidly through the organism. c) the element enhances health but is not essential for the organism's long-term survival. d) the element is very rare on Earth. e) the element is required in very small amounts. 9) Acid precipitation has lowered the pH of a particular lake to 4.0. What is the hydrogen ion concentration of the lake? a) 4.0 M b) 10 -10 M c) 10 -4 M d) 10 4 M e) 4% 10) How many grams of acetic acid (C 2 H 4 O 2 ) would you use to make 10 L of a 0.1 M aqueous solution of acetic acid? (Note: The atomic masses, in daltons, are approximately 12 for carbon, 1 for hydrogen, and 16 for oxygen.) a) 10.0 g b) 0.1 g c) 6.0 g d) 60.0 g e) 0.6 g 11) We can be sure that a mole of table sugar and a mole of vitamin C are equal in their a) mass in daltons. b) mass in grams. c) number of molecules. d) number of atoms. e) volume.
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Fall 2008 BIO 202 Practice Midterm Exam 1 P a ge 2 12) In a neutral solution the concentration of a) hydrogen ions is equal to the concentration of hydroxide ions. b) water molecules is less than the concentration of hydrogen ions. c) hydrogen ions is less than the concentration of hydroxide ions. d) water molecules is less than the concentration of hydroxide ions.
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PracticeExam1 - Fall 2008 BIO 202 Practice Midterm Exam 1...

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