Biology, 5e (Brooker) J J
Chapter 2 The Chemical Basis of Life I: Atoms, Molecules, and Water
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1) The atomic number of an atom is
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A) the number of protons in the atom.
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B) the number of neutrons in the atom.
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C) the number of protons and electrons in the atom.
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D) the number of protons and neutrons in the atom.
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E) None of these choices are correct. J J J J J
Answer: A Section J J
: 02.01 Topic: Ato
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ms
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LO: 02.01.01 Describe the general structure of atoms.
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2) The smallest functional units of matter that cannot be further broken down by ordinary che
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mical or physical means are
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A) atoms.
B) molecules.
C) proteins.
D) shells.
E) bonds.
Answer: A Section J J
: 02.01 Topic: Ato
J J J
ms
Bloom's: 1. Remember Accessibility: J J J
JKeyboard Navigation J
LO: 02.01.01 Describe the general structure of atoms.
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3) With an atomic mass of 16 and an atomic number of 8, it follows that oxygen
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A) has eight electrons. J J
B) has 16 neutrons. J J
C) can readily form bonds with 2 other atoms.
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D) weighs 16 grams. J J
Answer: A, C S J J J
ection: 02.01 T J J
opic: Atoms J
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: Keyboard Navigation
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LO: 02.01.05 CoreSKILLS Quantify atomic mass using units such as daltons and moles.
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1
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4) The nucleus of an atom is composed of
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A) protons.
B) neutrons.
C) electrons.
D) protons and neutrons. J J
E) protons and electrons. J J
Answer: D Section J J
: 02.01 Topic: Ato
J J J
ms
Bloom's: 1. Remember Accessibility: J J J
JKeyboard Navigation J
LO: 02.01.01 Describe the general structure of atoms.
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5) Ernest Rutherford's key experiment on alpha particle bombardment of gold foil was important to t
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he development of
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A) detection methods for protons. J J J
B) alpha particle emitters. J J
C) gold as an element. J J J
D) the modern model for atomic structure.
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E) the concept that atoms have a homogenous distribution of protons throughout the atom.
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Answer: D Section J J
: 02.01 Topic: Ato
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ms
Bloom's: 1. Remember Accessibility: J J J
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LO: 02.01.02 CoreSKILLS Interpret the results of an experiment indicating that most of an atom is
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empty space. J
6) If a scientist were to shoot protons through an atom as Rutherford did with gold foil, he or she woul
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d likely find that
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A) most of the protons passed straight through the atom.
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B) few of the protons passed straight through the atom.
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C) most of the protons deflected or bounced back from the atom.
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D) most of the protons were absorbed by the atom.
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E) the atom emitted electrons.
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Answer: A Section J J
: 02.01 Topic: Ato
J J J
ms
Bloom's: 2. Understand Accessibility J J J
: Keyboard Navigation
J J
LO: 02.01.02 CoreSKILLS Interpret the results of an experiment indicating that most of an atom is
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empty space. J
2
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7) The first, innermost energy shell of an atom
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A) can have a maximum of 8 electrons.
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B) can have a maximum of 2 electrons.
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C) is called the 2p orbital.
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D) is called the 1s orbital and can have a maximum of 8 electrons.
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E) is called the 2p orbital and can have a maximum of 2 electrons.
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Answer: B Section J J
: 02.01 Topic: Ato
J J J
ms
Bloom's: 1. Remember Accessibility: J J J
JKeyboard Navigation J
LO: 02.01.03 CoreSKILLS Define orbital and electron shell.
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8) Tritiated hydrogen (3H) differs from hydrogen (1H) in that
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A) 3H has 2 more protons than 1H.
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B) 3H has 2 more electrons than 1H.
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C) 3H has 2 more neutrons than 1H.
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D) 3H has the same number of neutrons as 1H.
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E) 3H has a different electron configuration than 1H.
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Answer: C Section J J
: 02.01 Topic: Ato
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ms
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: Keyboard Navigation
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LO: 02.01.06 Explain how a single element may exist in two or more forms, called isotopes, and ho
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w certain isotopes have importance in human medicine.
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9) Isotopes are different forms of the same element that
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A) differ in their number of neutrons.
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B) differ in their number of protons.J J J J J
C) are all produced artificially.
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D) cannot form covalent bonds. J J J
E) cannot form ions. J J
Answer: A Section J J
: 02.01 Topic: Ato
J J J
ms
Bloom's: 2. Understand Accessibility J J J
: Keyboard Navigation
J J
LO: 02.01.06 Explain how a single element may exist in two or more forms, called isotopes, and ho
J J J J J J J J J J J J J J J J J
w certain isotopes have importance in human medicine.
J J J J J J J
3
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