Question 1

Which of the following elements has the greatest number of valence electrons?

Accepted Answer

Bromine (Br)

Question 2

A patient is given a salt solution intravenously. Which property of the salt is most responsible for its ability to conduct electricity in solution?

Accepted Answer

It dissociates into ions, which move freely in solution.

Question 3

Which of the following best explains why metals are malleable and conduct electricity?

Accepted Answer

Their valence electrons are delocalized and form a 'sea of electrons' around positive ions.

Question 4

Which of the following molecules contains an atom with an incomplete octet?

Accepted Answer

BF3

Question 5

Given the following electronegativities: H (2.1), Cl (3.0), O (3.5), F (4.0), which bond is the most polar?

Accepted Answer

H–F

Question 6

Which of the following ions has a correct Lewis dot symbol representation?

Accepted Answer

P3− with 8 dots

Question 7

A student is asked to calculate the formal charge of nitrogen in NH3. Which is the correct calculation?

Accepted Answer

5 – (2 + 3) = 0

Question 8

Which of the following best describes the main source of strength in an ionic bond?

Accepted Answer

The attraction between oppositely charged ions

Question 9

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

Accepted Answer

Sodium ion (Na+)

Question 10

Arrange the following molecules in order of decreasing dipole moment: HCl, CO2, H2O.

Accepted Answer

H2O \u003e HCl \u003e CO2

Question 11

Which of the following best describes the bonding in sodium chloride (NaCl)?

Accepted Answer

Ionic bonding

Question 12

A molecule of SF6 is stable even though sulfur has 12 electrons in its valence shell. This is an example of:

Accepted Answer

An expanded octet

Question 13

Which of the following best explains why water (H2O) is a polar molecule?

Accepted Answer

It has polar covalent bonds and a bent molecular shape.

Question 14

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity increases from bottom to top within a group.

Question 15

Which of the following best describes the type of bonding and properties in copper wire used in electrical circuits?

Accepted Answer

Metallic bonding; high conductivity; malleable

Question 16

Which of the following pairs of atoms would form a bond with the greatest ionic character?

Accepted Answer

Na and Cl

Question 17

A Lewis structure for the cyanide ion (CN−) shows a triple bond between C and N. What is the formal charge on nitrogen?

Accepted Answer

−1

Question 18

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

Accepted Answer

Polar covalent bonds have unequal sharing of electrons; nonpolar covalent bonds have equal sharing.

Question 19

Which of the following molecules is most likely to have resonance structures?

Accepted Answer

NO2−

Question 20

A phosphorus atom in PH4+ is surrounded by how many electrons in its valence shell?

Accepted Answer

8

Chemical Bonding and Lewis Structures: Study Notes for General Chemistry

Study Guide - Practice Questions