Question 1

Which of the following statements best describes the difference between metallic and ionic solids?

Accepted Answer

Metallic solids conduct electricity in the solid state, while ionic solids conduct electricity only when molten or dissolved.

Question 2

Which of the following best explains why ionic solids tend to have high melting points?

Accepted Answer

Electrostatic attractions between oppositely charged ions require a large amount of energy to break.

Question 3

Which of the following is the correct Lewis structure for the ammonium ion ($$\mathrm{NH_4$^+}$$)?

Accepted Answer

Nitrogen with four single bonds to hydrogen and no lone pairs, with a positive charge.

Question 4

Which of the following molecules is expected to be polar?

Accepted Answer

$$\mathrm{NH_3$} ($$ammonia)

Question 5

Which statement about covalent network solids is correct?

Accepted Answer

They have high melting points due to a continuous network of covalent bonds.

Question 6

What is the formal charge on the central atom in $$\mathrm{NO_3$^-} ($$nitrate ion)?

Accepted Answer

0

Question 7

Which of the following best describes the bond order in a molecule of $$\mathrm{O_2$}$$?

Accepted Answer

Bond order = 2

Question 8

Which of the following elements is most likely to violate the octet rule?

Accepted Answer

Phosphorus

Question 9

Which of the following statements about lattice energy is correct?

Accepted Answer

Lattice energy increases as the charge on the ions increases.

Question 10

Which of the following best describes the geometry and hybridization of methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

Tetrahedral, $$sp^3$$ hybridization

Question 11

Which molecule has a bond angle closest to $$109.5^\circ$$?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 12

Which of the following is true about the conductivity of ionic solids?

Accepted Answer

They conduct electricity when dissolved in water or molten.

Question 13

Which of the following best explains why metals are malleable?

Accepted Answer

Metal atoms are surrounded by a 'sea' of delocalized electrons that allow atoms to slide past each other.

Question 14

Which of the following molecules contains both sigma and pi bonds?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 15

Which of the following is the correct electron domain geometry for $$\mathrm{SF_4$}$$?

Accepted Answer

Trigonal bipyramidal

Question 16

Which of the following statements about dipole moments is correct?

Accepted Answer

A molecule with nonpolar bonds can never be polar.

Question 17

Which of the following molecules is expected to have a resonance structure?

Accepted Answer

$$\mathrm{O_3$} ($$ozone)

Question 18

Which of the following best describes the bond order in a triple bond?

Accepted Answer

One sigma bond and two pi bonds

Question 19

Which of the following is the correct formula for calculating formal charge?

Accepted Answer

$$	ext{Formal charge} = 	ext{number of valence electrons} - (	ext{number of lone pair electrons} + \frac{1}{2} 	imes 	ext{number of bonding electrons})$$

Question 20

Which of the following best explains why $$\mathrm{NaCl}$$ conducts electricity when dissolved in water?

Accepted Answer

The ions are free to move and carry charge in solution.

AP CHEM UNIT 2

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