Question 1

Which of the following statements best explains why CCl$$_4$$ forms covalent bonds rather than ionic bonds under typical conditions?

Accepted Answer

The ionization energy required to form C$$^{4+} is $$too high to be compensated by lattice energy.

Question 2

Which element has the highest electronegativity according to the periodic trends discussed?

Accepted Answer

Fluorine

Question 3

What is the main driving force for the formation of an ionic compound?

Accepted Answer

The lattice energy

Question 4

Which of the following bonds is expected to have the greatest bond dissociation energy?

Accepted Answer

C–H bond in C$$_2H$_6$$

Question 5

Which compound below is most likely to have a nonpolar covalent bond?

Accepted Answer

Cl$$_2$$

Question 6

Given the following electronegativity values: H = 2.1, C = 2.5, N = 3.0, O = 3.5, which bond is the most polar?

Accepted Answer

C–O

Question 7

Which statement about the octet rule is correct?

Accepted Answer

Hydrogen satisfies the octet rule with two valence electrons.

Question 8

What is the total number of valence electrons in a molecule of CO$$_2$$?

Accepted Answer

$$16$$

Question 9

Which of the following best describes the bond in HCl?

Accepted Answer

Polar covalent

Question 10

When drawing the Lewis structure for NH$$_4^+$$, how many valence electrons should be used?

Accepted Answer

$$8$$

Question 11

Which of the following statements about bond polarity is correct?

Accepted Answer

Bond polarity is estimated from differences in electronegativity values.

Question 12

What is the correct Lewis structure for a molecule of O$$_2$$?

Accepted Answer

A double bond between the two oxygen atoms with two lone pairs on each atom.

Question 13

Which of the following is true about covalent bonding?

Accepted Answer

Covalent bonding is localized between the two atoms involved.

Question 14

Which of the following compounds is expected to have the highest percent ionic character?

Accepted Answer

NaCl

Question 15

If a molecule has a central atom that does not satisfy the octet rule after distributing all electrons, what should you do next when drawing its Lewis structure?

Accepted Answer

Form a multiple bond by converting a lone pair from a terminal atom into a bonding pair.

Question 16

Which of the following best describes the relationship between lattice energy and ionic bond strength?

Accepted Answer

They are directly proportional.

Question 17

Which of the following is a correct step when drawing the Lewis structure for a polyatomic ion?

Accepted Answer

Add one electron for each negative charge.

Question 18

Which of the following elements is most likely to occupy a terminal position in a Lewis structure?

Accepted Answer

Hydrogen

Question 19

Which of the following statements about electron affinity is correct?

Accepted Answer

Noble gases have positive electron affinities.

Question 20

Which of the following is the correct formula for the covalent compound formed between silicon and fluorine?

Accepted Answer

SiF$$_4$$

Covalent Bonds, Electronegativity, and Lewis Structures: General Chemistry Study Notes

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