Question 1

Which of the following statements about chemical bonds is NOT correct?

Accepted Answer

The bond energy is the energy released when two atoms are infinitely far apart come together at a distance that minimizes the electrostatic potential energy.

Question 2

Which of the following is most likely a polar covalent bond?

Accepted Answer

$$\mathrm{H-Cl}$$

Question 3

What type of bonding is present in $$\mathrm{NaCl}$$?

Accepted Answer

ionic

Question 4

How many valence electrons does fluorine ($$\mathrm{F}) $$have?

Accepted Answer

7

Question 5

Which of the following is the correct Lewis symbol for sulfur ($$\mathrm{S}$$)?

Accepted Answer

$$\mathrm{S}$$ with 6 dots around it

Question 6

Which of the following is the correct Lewis symbol for the oxide anion ($$\mathrm{O}^{2-}$$)?

Accepted Answer

$$\mathrm{O}$$ with 8 dots and a $$2-$$ charge

Question 7

How many total shared electrons are there in the Lewis structure of $$\mathrm{CS}_2$$?

Accepted Answer

8

Question 8

How many shared electron pairs are there in the Lewis structure of $$\mathrm{CN}^-$$?

Accepted Answer

3

Question 9

Which of the following molecules has only a single bond?

Accepted Answer

$$\mathrm{Cl}_2$$

Question 10

How many lone pairs are there in $$\mathrm{ClO}_3^-$$?

Accepted Answer

6

Question 11

Which of the following is the correct Lewis structure for carbon dioxide ($$\mathrm{CO}_2$$)?

Accepted Answer

$$\mathrm{O=C=O}$$ with two lone pairs on each oxygen

Question 12

How many lone-pair electrons are on each of the nitrogen atoms in the Lewis structure for dinitrogen tetroxide ($$\mathrm{N}_2\mathrm{O}_4$$)?

Accepted Answer

2

Question 13

Which of the following sequences does NOT have the elements arranged correctly in order of increasing electronegativity?

Accepted Answer

$$\mathrm{H} \u003c \mathrm{Li} \u003c \mathrm{Cs}$$

Question 14

In general, resonance ________ electrons and ________ molecules.

Accepted Answer

delocalizes; stabilizes

Question 15

How many total equivalent Lewis structures are needed to describe the carbonate anion, $$\mathrm{CO}_3$$^{2-}$$?

Accepted Answer

3

Question 16

Nitrite ($$\mathrm{NO}_2^-) is an $$important nutrient in the eutrophic zone of the ocean. Which of the following is the correct set of resonance structures for this ion?

Accepted Answer

I and III

Question 17

The formal charge on an atom in a Lewis structure is calculated as:

Accepted Answer

the difference between the number of valence electrons in a free atom and the number of electrons assigned to it in the Lewis structure

Question 18

What is the formal charge of each atom (from left to right) in the following resonance structure of $$\mathrm{SN}_2^-$$: $$\mathrm{S=N=N}$$?

Accepted Answer

0, -1, 0

Question 19

Use the formal charge as a criterion to identify the Lewis structure below that is most stable.

Accepted Answer

The structure with all atoms having a formal charge of zero

Question 20

How many valence electrons surround the xenon atom in xenon tetrafluoride ($$\mathrm{XeF}_4$$)?

Accepted Answer

12

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