Question 1

Which of the following best explains why the lattice energy of potassium bromide ($$\mathrm{KBr}) is $$more exothermic than that of rubidium iodide ($$\mathrm{RbI}$$)?

Accepted Answer

Potassium and bromine have smaller ionic radii, resulting in stronger electrostatic attraction.

Question 2

Arrange the following compounds in order of increasing magnitude of lattice energy: $$\mathrm{KCl}$$, $$\mathrm{SrO}$$, $$\mathrm{RbBr}$$, $$\mathrm{CaO}.$$

Accepted Answer

$$\mathrm{RbBr} \u003c \mathrm{KCl} \u003c \mathrm{SrO} \u003c \mathrm{CaO}$$

Question 3

Which of the following Lewis structures obeys the octet rule for $$\mathrm{CO_2$}$$?

Accepted Answer

$$\mathrm{:O=C=O:}$$

Question 4

What is the formal charge on the central atom in the Lewis structure of $$\mathrm{NO_2$^-}$$?

Accepted Answer

0

Question 5

Which molecule below contains an expanded octet?

Accepted Answer

$$\mathrm{$$ClF_5$$}$$

Question 6

Which pair of atoms forms a pure covalent bond?

Accepted Answer

Br and Br

Question 7

Which of the following molecules has a Lewis structure with a central atom that does NOT obey the octet rule?

Accepted Answer

$$\mathrm{$$BCl_3$$}$$

Question 8

What is the electron configuration for nitrogen ($$\mathrm{N}$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^3$$

Question 9

Which of the following ions has the highest lattice energy when combined with $$\mathrm{O$$^{2-}$$}$$?

Accepted Answer

$$\mathrm{Mg$$^{2+}$$}$$

Question 10

Which of the following best describes the trend in lattice energies of alkaline earth metal oxides?

Accepted Answer

Lattice energy decreases as the cation size increases.

Question 11

Which molecule below is most likely to have resonance structures?

Accepted Answer

$$\mathrm{CO_3$^{2-}}$$

Question 12

Which of the following bonds is most ionic?

Accepted Answer

K and F

Question 13

Which of the following is the correct Lewis symbol for $$\mathrm{Mg$$^{2+}$$}$$?

Accepted Answer

$$\mathrm{Mg}$$ with no dots and a $$2+$$ charge

Question 14

Which molecule below contains an odd number of electrons?

Accepted Answer

$$\mathrm{NO}$$

Question 15

Which of the following molecules has the shortest nitrogen-nitrogen bond?

Accepted Answer

$$\mathrm{HNNH}$$

Question 16

Which of the following is the best Lewis structure for the acetate ion ($$\mathrm{CH_3COO^-}$$)?

Accepted Answer

One oxygen with a double bond to carbon, one oxygen with a single bond and a negative charge.

Question 17

Which of the following is a real-world application of lattice energy?

Accepted Answer

Predicting the solubility of ionic compounds in water.

Question 18

Which of the following statements about resonance structures is correct?

Accepted Answer

Resonance structures represent the same compound with delocalized electrons.

Question 19

Which of the following is the correct formula for the compound formed between $$\mathrm{Ca}$$ and $$\mathrm{N}$$?

Accepted Answer

$$\mathrm{Ca_3N_2}$$

Question 20

Which of the following is the correct electron configuration for neon ($$\mathrm{Ne}$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$

Study Guide: Lewis Structures, Lattice Energy, and Chemical Bonding

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