Question 1

Which of the following correctly describes the Lewis structure for the chloride ion in sodium chloride ($$\mathrm{NaCl}$$)?

Accepted Answer

The chloride ion is shown with 8 valence electrons in brackets and a negative charge.

Question 2

How many total valence electrons are present in the Lewis structure for $$\mathrm{CO_2$}$$?

Accepted Answer

$$16$$

Question 3

Which of the following elements is most likely to form a triple bond in a diatomic molecule?

Accepted Answer

Nitrogen

Question 4

What is the correct Lewis structure for $$\mathrm{CH_4$} ($$methane)?

Accepted Answer

A central C atom with four single bonds to four H atoms, no lone pairs on C.

Question 5

Which of the following molecules has a bent molecular shape due to the presence of lone pairs on the central atom?

Accepted Answer

$$\mathrm{H_2O}$$

Question 6

How many resonance structures can be drawn for the carbonate ion ($$\mathrm{CO_3$^{2-}}$$)?

Accepted Answer

3

Question 7

According to VSEPR theory, what is the electron-group geometry and bond angle for $$\mathrm{CO_2$}$$?

Accepted Answer

Linear, $$180^\circ$$

Question 8

Which of the following steps is NOT part of the process for drawing a Lewis structure for a polyatomic ion?

Accepted Answer

Adding electrons for each negative charge.

Question 9

What is the molecular shape of $$\mathrm{NH_3$} ($$ammonia) according to VSEPR theory?

Accepted Answer

Trigonal pyramidal

Question 10

Which of the following molecules contains a central atom with three electron groups and one lone pair, resulting in a bent shape?

Accepted Answer

$$\mathrm{SO_2$}$$

Question 11

Which of the following best explains why $$\mathrm{O_3$} ($$ozone) has resonance structures?

Accepted Answer

Because the double bond can be placed in more than one position, resulting in equivalent structures.

Question 12

Which of the following is true about the Lewis structure for $$\mathrm{$$ClO_2$$^-}$$?

Accepted Answer

It contains 20 valence electrons.

Question 13

A molecule has four electron groups around the central atom, two of which are lone pairs. What is the molecular shape and bond angle?

Accepted Answer

Bent, $$109^\circ$$

Question 14

Which of the following elements does NOT form double or triple bonds in molecular compounds?

Accepted Answer

Hydrogen

Question 15

What is the correct sequence of steps for drawing a Lewis structure for $$\mathrm{$$NCl_3$$}$$?

Accepted Answer

Sum valence electrons, select central atom, connect atoms with single bonds, fill octets on outer atoms, assign remaining electrons to central atom, form multiple bonds if needed, verify structure.

Question 16

Which of the following molecules is correctly matched with its molecular geometry?

Accepted Answer

$$\mathrm{H_2O}$$: bent

Question 17

Which statement best describes the difference between electron-group geometry and molecular shape in VSEPR theory?

Accepted Answer

Electron-group geometry considers both bonded atoms and lone pairs, while molecular shape considers only bonded atoms.

Question 18

Which of the following is a correct Lewis symbol for magnesium?

Accepted Answer

$$\mathrm{Mg}$$ with two dots on the same side

Question 19

A molecule of $$\mathrm{PF_3$}$$ has how many electron groups, how many bonded atoms, and what shape?

Accepted Answer

4 electron groups, 3 bonded atoms, trigonal pyramidal

Bonding and Properties of Solids and Liquids: Lewis Structures, Resonance, and Molecular Shapes

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