Q: According to Pauling’s method, the expected bond energy for a molecule HX is calculated as:

$$\frac{\text{H--H bond energy} + \text{X--X bond energy}}{2}$$

Question 1

Which of the following best describes the difference between an ionic bond and a covalent bond?

Accepted Answer

An ionic bond involves the transfer of electrons from a metal to a nonmetal, while a covalent bond involves the sharing of electrons between two nonmetals.

Question 2

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

Accepted Answer

HF

Question 3

Given the following ions: Na$$^+$$, K$$^+$$, Ga$$^{3+}$$, Ca$$^{2+}$$, which is the largest in size?

Accepted Answer

K$$^+$$

Question 4

Which of the following best explains why the H$$_2$$ molecule is more stable than two separate H atoms?

Accepted Answer

The simultaneous attraction of both nuclei for the shared electrons lowers the potential energy of the system.

Question 5

Which of the following is the correct formula for calcium oxide, given the charges of Ca$$^{2+}$$ and O$$^{2-}$$?

Accepted Answer

CaO

Question 6

Which of the following best describes the concept of electronegativity?

Accepted Answer

The ability of an atom in a molecule to attract shared electrons toward itself.

Question 7

According to Pauling’s method, the expected bond energy for a molecule HX is calculated as:

Accepted Answer

$$\frac{	ext{H--H bond energy} + 	ext{X--X bond energy}}{2}$$

Question 8

Which of the following is the correct name for the compound NaBrO?

Accepted Answer

Sodium hypobromite

Question 9

Which of the following statements about the octet rule is correct?

Accepted Answer

Most main group elements form stable molecules when surrounded by eight valence electrons.

Question 10

Which of the following is the correct systematic name for N$$_2O$_5$$?

Accepted Answer

Dinitrogen pentoxide

Question 11

A compound is named copper(II) sulfate pentahydrate. What is its chemical formula?

Accepted Answer

CuSO$$_4$$ \cdot 5H$$_2O$$

Question 12

Which of the following best describes a hydrate?

Accepted Answer

A compound that contains water molecules trapped in its crystal structure.

Question 13

Which of the following is the correct name for HNO$$_2$$?

Accepted Answer

Nitrous acid

Question 14

Which of the following is the correct condensed formula for a molecule with three carbons, eight hydrogens, and one bromine atom?

Accepted Answer

CH$$_3CH$_2CH$_2Br$$

Question 15

Which of the following best describes the role of formal charge in Lewis structures?

Accepted Answer

It estimates the charge on all possible nonequivalent Lewis structures to determine the most stable structure.

Question 16

Which of the following is the correct name for the acid HClO$$_4$$?

Accepted Answer

Perchloric acid

Question 17

Which of the following is the correct formula for dinitrogen tetroxide?

Accepted Answer

N$$_2O$_4$$

Question 18

Which of the following best explains why boron often forms compounds with fewer than eight electrons around it?

Accepted Answer

Boron is in Period 2 and can be stable with only six electrons in its valence shell.

Question 19

Which of the following is the correct name for the compound KIO$$_3$$?

Accepted Answer

Potassium iodate

Question 20

Arrange the following ions in order of increasing size: Ba$$^{2+}$$, Cs$$^+$$, I$$^-$$, Te$$^{2-}.$$

Accepted Answer

Ba$$^{2+}$$ \u003c Cs$$^+$$ \u003c I$$^-$$ \u003c Te$$^{2-}$$

Bonding: General Concepts – Study Notes

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