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Chemistry: Chemical Bonding & Molecular Structure Flashcards

7 cards from real AP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which species is isoelectronic with the neon atom?

    Answer: F-

    F- gains one electron to reach 10 electrons, identical to neon's configuration.

  2. In molecular orbital theory, what is the bond order of the O2 molecule?

    Answer: 2

    O2 has a bond order of 2, calculated as (8 bonding - 4 antibonding)/2.

  3. Why is O2 paramagnetic, a property correctly predicted by molecular orbital theory but not by simple Lewis structures?

    Answer: It has two unpaired electrons in pi antibonding orbitals

    MO theory places two unpaired electrons in the degenerate pi* antibonding orbitals, making O2 paramagnetic.

  4. Which of the following molecules is nonpolar despite containing polar bonds?

    Answer: CCl4

    CCl4 has tetrahedral symmetry that causes the bond dipoles to cancel, making it nonpolar.

  5. What type of crystal lattice is found in solid sodium chloride?

    Answer: Ionic

    NaCl forms an ionic lattice of alternating Na+ and Cl- ions held by electrostatic attraction.

  6. Which compound is expected to have the greatest lattice energy?

    Answer: MgO

    MgO has the largest lattice energy because of its 2+ and 2- charges combined with small ionic radii.

  7. How many resonance structures contribute to the carbonate ion (CO3^2-)?

    Answer: 3

    The carbonate ion has three equivalent resonance structures from delocalizing the double bond among three oxygens.