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Essential Organic Chemistry, 2e (Bruice)

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Chapter 1

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Electronic Structure and Covalent Bonding

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1)

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Atoms with the same number of protons but different numbers of neutrons are called ______.

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Answer:

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isotopes

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Section:

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1.1

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2)

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What isotope of chlorine has the same number of neutrons as Argon-38?

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A)

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17Cl

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B)

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35Cl

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C)

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36Cl

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D)

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37Cl

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E)

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38Cl

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Answer:

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D

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Section:

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1.1

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3)

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Which statement is incorrect about the atomic number of an atom?

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A)

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It equals the number of protons in its nucleus.

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B)

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It equals the number of electrons outside the nucleus.

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C)

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It equals the sum of its protons and neutrons..

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D)

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It is a whole number.

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E)

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It is given on the Periodic Table.

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Answer:

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C

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Section:

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1.1

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4)

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Which of the following elements does this electronic configuration represent?

1s2 2s2 2p5

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A)

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F

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B)

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C

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C)

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N

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D)

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Al

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E)

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O

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Answer:

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A

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Section:

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1.2

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5)

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Which of the following is the electronic configuration of the element Fe?

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A)

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1s2 2s2 2p6 3s2 3p6 4s2 3d6

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B)

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1s2 2s2 2p6 3s2 3p8 3d6

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C)

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1s2 2s2 2p8 3s2 3p6 4s2 3d6

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D)

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1s2 2s2 2p6 3s2 3p6 4s2 4d6

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E)

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1s2 2s2 2p6 3s2 3p6 4s2 4p6

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Answer:

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A

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Section:

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1.2

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6)

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Ar, K+, Cl- are isoelectronic elements (elements with the same number of electrons). What orbital does the last electron occupy?

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Answer:

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3p orbital

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Section:

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1.2

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7)

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The atomic number of boron is 5. The correct electronic configuration of boron is ______.

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A)

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1s2 2s3

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B)

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1s2 2p3

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C)

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1s2 2s2 2p1

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D)

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2s2 2p3

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E)

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1s2 2s2 3s1

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Answer:

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C

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Section:

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1.2

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8)

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Which of the following statements correctly describes the third electron shell that surrounds the nucleus of an atom?

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A)

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The third shell contains only s and p atomic orbitals.

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B)

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The maximum number of electrons that can occupy the third shell is 18.

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C)

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The total number of atomic orbitals present in the third shell is 16.

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D)

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The third shell can contain f orbitals.

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E)

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none of the above

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Answer:

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B

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Section:

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1.2

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9)

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Which of the following describes a hydride ion?

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A)

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a negatively charged hydrogen ion containing a pair of electrons

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B)

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a positively charged hydrogen ion

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C)

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a hydrogen ion containing a single electron

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D)

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a negatively charged OH ion

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E)

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a proton containing an extra electron

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Answer:

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A

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Section:

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1.3

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10)

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Rank the following atoms in increasing electronegativity.

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A)

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N, Na, Si, O, C

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B)

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C, N, O, Na, Si

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C)

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O, N, C, Si, Na

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D)

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Si, C, N, O, Na

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E)

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Na, Si, C, N, O

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Answer:

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E

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Section:

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1.3

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11)

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