Question 1

Which combination of the ions A, B, X, and Y (as shown in the diagram) will produce an ionic compound with a 1:1 ratio of cations to anions?

Accepted Answer

B and X

Question 2

Among the possible 1:1 ionic compounds formed from A, B, X, and Y, which combination will have the largest lattice energy?

Accepted Answer

A and Y

Question 3

How does the lattice energy of an ionic solid change as the charges of the ions increase?

Accepted Answer

It increases

Question 4

How does the lattice energy of an ionic solid change as the sizes of the ions increase?

Accepted Answer

It decreases

Question 5

Arrange the following compounds in order of increasing lattice energy: KI, LiBr, MgS, GaN.

Accepted Answer

KI \u003c LiBr \u003c MgS \u003c GaN

Question 6

Which of the following pairs of elements has the largest difference in electronegativity?

Accepted Answer

K and F

Question 7

Which of the following bonds is the most polar?

Accepted Answer

$$\mathrm{C-F}$$

Question 8

Which of the following statements about the Lewis structure of the formate ion ($$\mathrm{$$HCO_2$$^-}) is $$correct?

Accepted Answer

It cannot be represented by a single Lewis structure.

Question 9

Which of the following binary compounds is an ionic substance?

Accepted Answer

CaF$$_2$$

Question 10

Which of the following statements about resonance structures is true?

Accepted Answer

Resonance structures are used when a single Lewis structure cannot accurately represent the molecule.

Question 11

Which of the following molecules or ions does NOT obey the octet rule?

Accepted Answer

$$\mathrm{NO}$$

Question 12

Which of the following statements is FALSE?

Accepted Answer

There are exactly six bonding electrons in the $$\mathrm{O_2$}$$ molecule.

Question 13

Which of the following statements about methyl formate ($$\mathrm{C_2H_4O_2}) is $$correct?

Accepted Answer

Bond 1 is the strongest carbon–oxygen bond.

Question 14

Which of the following best explains why $$\mathrm{GaN}$$ has a higher lattice energy than $$\mathrm{KI}$$?

Accepted Answer

GaN has smaller ions and higher charges than KI.

Question 15

Which of the following molecules has the most favorable formal charges in its best Lewis structure?

Accepted Answer

$$\mathrm{$$XeO_3$$}$$ with two Xe=O double bonds

Question 16

Which of the following statements about bond polarity is correct?

Accepted Answer

A bond between two identical atoms is always nonpolar.

Question 17

Which of the following is the most electronegative atom in its set?

Accepted Answer

F in the set F, S, O

Question 18

Which of the following statements about the Lewis structure of $$\mathrm{BF_3$} is $$correct?

Accepted Answer

The boron atom does not satisfy the octet rule.

Question 19

Which of the following bonds is the least polar?

Accepted Answer

$$\mathrm{C-S}$$

Question 20

Which of the following statements about the average bond enthalpy of triple bonds is correct?

Accepted Answer

The average bond enthalpy of triple bonds depends on the atoms involved.

General Chemistry Study Guide: Ionic Compounds, Lattice Energy, Electronegativity, Lewis Structures, and Bond Properties

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