Question 1

Which of the following elements is most likely to have an expanded octet in a stable compound?

Accepted Answer

Phosphorus (P)

Question 2

A sample of sodium chloride (NaCl) is melted and an electric current is passed through it. Which property of NaCl is being demonstrated?

Accepted Answer

Electrical conductivity in the molten state

Question 3

Which of the following molecules contains a bond with the greatest ionic character?

Accepted Answer

SrO₂

Question 4

Which of the following best explains why metals are good conductors of electricity?

Accepted Answer

They have delocalized electrons that move freely throughout the structure.

Question 5

Which of the following elements is least likely to form covalent bonds?

Accepted Answer

Potassium (K)

Question 6

Arrange the following molecules in order of decreasing dipole moment: HI, HF, HBr, HCl.

Accepted Answer

HF \u003e HCl \u003e HBr \u003e HI

Question 7

Which of the following contains an atom that may have an incomplete octet?

Accepted Answer

BCl₃

Question 8

What is the formal charge on the nitrogen atom in ammonia (NH₃)?

Accepted Answer

0

Question 9

Which of the following best describes the property NOT attributed to metallic bonding?

Accepted Answer

Brittleness

Question 10

Which of the following bonds is the most polar?

Accepted Answer

S–F

Question 11

A student draws the Lewis dot symbol for the Te atom. How many valence electrons should be shown?

Accepted Answer

6

Question 12

Which element within the thiocyanate ion (NCS⁻) possesses a negative formal charge?

Accepted Answer

Nitrogen

Question 13

Which of the following best explains why ionic bond formation is exothermic?

Accepted Answer

It results in the mutual attraction of opposite charges, lowering the system's potential energy.

Question 14

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity increases from bottom to top within a group.

Question 15

A molecule has a net formal charge of -1. Which of the following could be its Lewis structure property?

Accepted Answer

The sum of all formal charges is -1.

Question 16

Which of the following best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve electron transfer; covalent bonds involve electron sharing.

Question 17

Which of the following is the correct Lewis dot symbol for a P³⁻ ion?

Accepted Answer

P with 8 dots and a 3− charge

Question 18

Which of the following best explains why chlorine (Cl) has more valence electrons than boron (B)?

Accepted Answer

Chlorine is in a higher group number, and main group elements have valence electrons equal to their group number.

Question 19

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond with unequal sharing of electrons due to a moderate difference in electronegativity.

Question 20

Which property is NOT typical of ionic compounds?

Accepted Answer

Malleability

Chemical Bonding and Lewis Structures: Study Notes

Study Guide - Practice Questions