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Which of the following statements about electronegativity and the periodic table is true?


A) Electronegativity decreases across a row of the periodic table.
B) Electronegativity increases down a column of the periodic table.
C) Electronegativity increases across a row of the periodic table.
D) Electronegativity does not change down a column of the periodic table.

E) A) and D)
F) None of the above

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Which of the following molecules are constitutional isomers? Which of the following molecules are constitutional isomers?   A) I, II, IV B) II, III, IV C) I, III, IV D) I, II, III


A) I, II, IV
B) II, III, IV
C) I, III, IV
D) I, II, III

E) B) and C)
F) A) and C)

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Which of the following would you expect to have ionic bonds?


A) CO
B) FBr
C) NF3
D) NaCl

E) None of the above
F) All of the above

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Which of the following resonance structures is the least important contributor to the resonance hybrid of the formate anion, HCOO-? <sup> </sup>Which of the following resonance structures is the least important contributor to the resonance hybrid of the formate anion, HCOO<sup>-</sup>?   A) I B) II C) III D) IV


A) I
B) II
C) III
D) IV

E) A) and D)
F) B) and D)

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Which of the following statements about resonance structures is true?


A) Resonance structures have the same placement of electrons but different arrangement of atoms.
B) Resonance structures have the same placement of atoms but different arrangement of electrons.
C) Resonance structures have the same placement of atoms and the same arrangement of electrons.
D) Resonance structures have different placement of atoms and different arrangement of electrons.

E) C) and D)
F) B) and C)

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What is the ground-state electronic configuration of a carbon atom?


A) 1s2, 2s2, 2p5
B) 1s2, 2s2, 2p2
C) 1s2, 2s2, 2p6
D) 1s2, 2s2, 2p4

E) A) and D)
F) A) and B)

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Which of the following statements about valence electrons is true?


A) They are the most tightly held electrons.
B) They do not participate in chemical reactions.
C) They are the outermost electrons.
D) They reveal the period number of a second-row element.

E) B) and D)
F) C) and D)

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Which of the following is the appropriate conversion of (CH3) 4C to a skeletal structure? Which of the following is the appropriate conversion of (CH<sub>3</sub>) <sub>4</sub>C to a skeletal structure?   A) I B) II C) III D) IV


A) I
B) II
C) III
D) IV

E) B) and C)
F) A) and D)

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Which of the following statements correctly describes the typical number of bonds for carbon, nitrogen, and oxygen in most neutral organic molecules?


A) Carbon forms 4 covalent bonds, nitrogen forms 2 covalent bonds, and oxygen forms 3 covalent bonds.
B) Carbon forms 4 covalent bonds, nitrogen forms 3 covalent bonds, and oxygen forms 2 covalent bonds.
C) Carbon forms 4 covalent bonds, nitrogen forms 5 covalent bonds, and oxygen forms 2 covalent bonds.
D) Carbon forms 4 covalent bonds, nitrogen forms 5 covalent bonds, and oxygen forms 4 covalent bonds.

E) B) and D)
F) None of the above

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