$$\text{P}$$ with five dots around it, one on each side and one pair on one side

Question 1

Which of the following best describes the Lewis model of chemical bonding?

Accepted Answer

Atoms transfer or share electrons to attain stable electron configurations, usually an octet.

Question 2

What is the correct Lewis structure for a phosphorus atom?

Accepted Answer

$$	ext{P}$$ with five dots around it, one on each side and one pair on one side

Question 3

Which of the following compounds is formed by the transfer of electrons from a metal to a nonmetal, resulting in an ionic bond?

Accepted Answer

$$	ext{KCl}$$

Question 4

How many valence electrons are present in an oxygen atom, and how is this represented in its Lewis structure?

Accepted Answer

6 valence electrons, represented as six dots around the symbol O

Question 5

Which of the following molecules contains a double bond in its Lewis structure?

Accepted Answer

$$	ext{O}_2$$

Question 6

What is the molecular geometry of $$	ext{CH}_4$$ according to VSEPR theory?

Accepted Answer

Tetrahedral

Question 7

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity increases across a period and decreases down a group.

Question 8

A molecule of $$	ext{CO}_2 is $$nonpolar even though it contains polar bonds. Why?

Accepted Answer

The molecule is linear, so the dipole moments cancel each other out.

Question 9

Which of the following best explains why oil and water do not mix?

Accepted Answer

Water is polar and oil is nonpolar, so they repel each other.

Question 10

What is the correct order of bond strength from weakest to strongest for single, double, and triple bonds?

Accepted Answer

Single \u003c Double \u003c Triple

Question 11

Which of the following molecules has a trigonal pyramidal molecular geometry?

Accepted Answer

$$	ext{NH}_3$$

Question 12

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

Accepted Answer

Bent

Question 13

Which of the following is an example of a molecule with resonance structures?

Accepted Answer

$$	ext{SO}_2$$

Question 14

What is the bond angle in a molecule with a trigonal planar electron geometry?

Accepted Answer

$$120^\circ$$

Question 15

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond in which electrons are shared unequally between two atoms of different electronegativities.

Question 16

Which of the following is a real-world application of molecular shape affecting function?

Accepted Answer

Artificial sweeteners fit into taste receptor pockets due to their molecular shape.

Question 17

Which of the following statements about free radicals is correct?

Accepted Answer

Free radicals contain an odd number of valence electrons and are highly reactive.

Question 18

What is the effect of lone pairs on the bond angles in $$	ext{NH}_3$$ and $$	ext{H}_2	ext{O}$$ compared to the ideal tetrahedral angle?

Accepted Answer

Lone pairs decrease the bond angles below $$109.5^\circ.$$

Question 19

Which of the following best explains how soap allows water and grease to mix?

Accepted Answer

Soap molecules have a polar head that interacts with water and a nonpolar tail that interacts with grease.

Question 20

A molecule has three electron groups around the central atom, one of which is a lone pair. What is the molecular geometry?

Accepted Answer

Bent

Chemical Bonding: Lewis Model, Molecular Geometry, and Electronegativity

Study Guide - Practice Questions