Question 1

Which of the following statements best describes the difference between ionic and molecular compounds?

Accepted Answer

Ionic compounds are composed of ions and typically have high melting points, while molecular compounds are composed of molecules and typically have low melting points.

Question 2

What is a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between atoms.

Question 3

Which element is most likely to form a triple covalent bond?

Accepted Answer

Nitrogen

Question 4

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

Accepted Answer

Four

Question 5

Which of the following molecules is nonpolar despite having polar covalent bonds?

Accepted Answer

Carbon dioxide ($$CO_2)$$

Question 6

What is the molecular geometry of methane ($$CH_4) $$according to the VSEPR theory?

Accepted Answer

Tetrahedral

Question 7

Which of the following best explains why water ($$H_2O) is a $$polar molecule?

Accepted Answer

It has a bent molecular shape and the oxygen atom is more electronegative than hydrogen.

Question 8

What is the correct Lewis structure for ammonia ($$NH_3$$)?

Accepted Answer

A nitrogen atom bonded to three hydrogen atoms with one lone pair on nitrogen.

Question 9

Which of the following statements about electronegativity is TRUE?

Accepted Answer

Electronegativity is the ability of an atom to attract electrons in a covalent bond.

Question 10

A molecule has three charge clouds around its central atom. What is its expected bond angle according to VSEPR theory?

Accepted Answer

$$120^\circ$$

Question 11

Which of the following is an example of a coordinate covalent bond?

Accepted Answer

The bond between nitrogen and hydrogen in the ammonium ion ($$NH_4$$^+$$)

Question 12

Which of the following compounds is most likely to be soluble in organic solvents but not in water?

Accepted Answer

Methane ($$CH_4)$$

Question 13

Which prefix is used to indicate five atoms of an element in a binary molecular compound?

Accepted Answer

Penta-

Question 14

Which of the following best describes the bond in $$HCl$$?

Accepted Answer

Polar covalent

Question 15

A molecule has a central atom with two lone pairs and two single bonds. What is its molecular geometry?

Accepted Answer

Bent

Question 16

Which of the following is a correct condensed structural formula for ethanol?

Accepted Answer

CH$$_3CH$_2OH$$

Question 17

Which of the following molecules contains a double bond?

Accepted Answer

Ethylene ($$C_2H_4)$$

Question 18

If a molecule has an electronegativity difference of 2.5 between its atoms, what type of bond is most likely present?

Accepted Answer

Ionic

Question 19

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

Accepted Answer

They have high melting and boiling points.

Question 20

Which step is NOT part of the method for drawing Lewis structures?

Accepted Answer

Assign formal charges to each atom before drawing bonds.

Chap 4 Molecular Compounds: Covalent Bonding, Structure, and Properties

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