Question 1

Which of the following elements will possess the most valence electrons according to their Lewis Dot Symbols?

Accepted Answer

Br

Question 2

For main group elements, the number of valence electrons is equal to which of the following?

Accepted Answer

The group number

Question 3

Which of the following species has bonds with the most ionic character?

Accepted Answer

SnO2

Question 4

The strength of an ionic bond comes principally from:

Accepted Answer

The mutual attraction of opposite electrical charges.

Question 5

Which of these elements is unlikely to form covalent bonds?

Accepted Answer

K

Question 6

Which of the following is NOT a physical property attributed to metallic bonding?

Accepted Answer

Brittleness

Question 7

Which of the following statements is true?

Accepted Answer

Zn is characterized by metallic bonding.

Question 8

Calculate the formal charge of the nitrogen atom in ammonia, NH3. Use the formula: $$	ext{Formal Charge} = 	ext{Valence Electrons} - (	ext{Nonbonding Electrons} + \frac{1}{2}	ext{Bonding Electrons})$$

Accepted Answer

$$0$$

Question 9

How many lone pairs does the sulfur atom possess in the hydrogen sulfide molecule (H2S)?

Accepted Answer

2

Question 10

Which of the following best describes the relationship between bond length and bond strength for a series of compounds involving bonds between the same two atoms?

Accepted Answer

The greater the bond strength, the shorter the bond.

Question 11

How many sigma ($$\sigma) $$and pi ($$\pi) $$bonds are present in a molecule of carbon dioxide, CO2?

Accepted Answer

2 $$\sigma$$, 2 $$\pi$$

Question 12

Which of the following molecules is most likely to have an expanded octet?

Accepted Answer

SF6

Question 13

A molecule has 5 electron groups around the central atom. Where is a lone pair most stable?

Accepted Answer

Equatorial position

Question 14

What is the molecular geometry of IF4$$^-$$?

Accepted Answer

Square planar

Question 15

Which of the following best describes the effect of lone pairs on bond angles in molecules?

Accepted Answer

Lone pairs decrease bond angles.

Question 16

According to Coulomb’s Law, the potential energy ($$E) $$between two ions is given by $$E = \frac{e Q_1$ Q_2$}{r}. If $$the charges are doubled and the distance is halved, what happens to the potential energy?

Accepted Answer

It increases by a factor of 8.

Question 17

What is the average bond order of the S–O bonds in the sulfite ion, SO3$$^{2-}$$, if there are three resonance structures each with one double bond and two single bonds?

Accepted Answer

$$1.33$$

Question 18

Which of the following acids will dissociate to produce two H$$^+$$ ions in solution?

Accepted Answer

H2SO4

Question 19

Which of the following best describes a resonance hybrid?

Accepted Answer

A composite of all major resonance structures.

Question 20

Which of the following molecules has a bond angle closest to $$109.5^\circ$$?

Accepted Answer

CH4

Chemical Bonding I: Lewis Structures, Bonding Types, and Molecular Geometry

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