Question 1

Which of the following statements best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between two atoms.

Question 2

Which of the following molecules is an example of a diatomic molecule that always exists as two atoms bonded together?

Accepted Answer

N$$_2$$

Question 3

According to the octet rule, how many covalent bonds does a nitrogen atom typically form in a stable molecule?

Accepted Answer

Three

Question 4

Which of the following best explains why CO$$_2 is a $$nonpolar molecule, even though it contains polar bonds?

Accepted Answer

The molecule is linear, causing the bond dipoles to cancel each other out.

Question 5

Which of the following is a property of molecular compounds but NOT of ionic compounds?

Accepted Answer

Low melting points and do not conduct electricity

Question 6

What is the bond angle in a molecule with a tetrahedral geometry according to VSEPR theory?

Accepted Answer

$$109.5^\circ$$

Question 7

Which of the following best describes a coordinate covalent bond?

Accepted Answer

A bond where both electrons in the shared pair come from the same atom.

Question 8

Which of the following molecules contains a triple bond?

Accepted Answer

N$$_2$$

Question 9

A molecule of ethylene (C$$_2H$_4) $$contains which type of bond between the two carbon atoms?

Accepted Answer

Double bond

Question 10

Which of the following elements is the most electronegative?

Accepted Answer

Fluorine

Question 11

Which of the following best describes the difference between a molecular formula and a structural formula?

Accepted Answer

A molecular formula shows only the types and numbers of atoms, while a structural formula shows the arrangement of atoms and bonds.

Question 12

Which of the following molecules is polar due to its molecular geometry and bond polarities?

Accepted Answer

H$$_2O$$

Question 13

What is the correct Lewis structure for ammonia (NH$$_3$$)?

Accepted Answer

Nitrogen with three single bonds to hydrogen and one lone pair on nitrogen.

Question 14

Which of the following is a correct step in drawing a Lewis structure for a molecule?

Accepted Answer

Count the total number of valence electrons in the molecule.

Question 15

Which of the following best explains why ionic compounds conduct electricity when dissolved in water, but molecular compounds generally do not?

Accepted Answer

Ionic compounds form ions in solution, which carry charge, while molecular compounds do not form ions.

Question 16

A molecule has three charge clouds around its central atom. According to VSEPR theory, what is its molecular geometry?

Accepted Answer

Planar triangular (trigonal planar)

Question 17

Which of the following is an exception to the octet rule?

Accepted Answer

A molecule where the central atom has fewer than 8 electrons, such as BF$$_3.$$

Question 18

Which of the following best describes the trend in electronegativity across the periodic table?

Accepted Answer

Electronegativity increases from left to right and decreases from top to bottom.

Question 19

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond in which electrons are shared unequally, resulting in partial charges.

Question 20

Which of the following is the correct name for the compound N$$_2O$_4$$?

Accepted Answer

Dinitrogen tetroxide

Chapter 4: Molecular Compounds – Structure, Bonding, and Properties

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