APCE Chemical Bonding & Molecular Structure

Question 1

What type of bond is formed when two atoms share electrons?

Accepted Answer

Covalent bond.

Answer

Ionic bond.

Answer

Metallic bond.

Answer

Van der Waals bond.

Question 2

What is the octet rule?

Accepted Answer

Atoms tend to have 8 electrons in their valence shell.

Answer

Atoms tend to form bonds to increase their atomic number.

Answer

Atoms tend to gain only electrons.

Answer

Atoms can have more than 8 electrons in their valence shell.

Question 3

What is the main characteristic of ionic bonding?

Accepted Answer

One atom donates electrons to another atom, forming oppositely charged ions.

Answer

Electrons are shared equally between atoms.

Answer

Atoms do not gain or lose electrons.

Answer

Electrons are transferred but not shared.

Question 4

What is the bond angle in a molecule with a tetrahedral geometry?

Accepted Answer

109.5°.

Answer

90°.

Answer

120°.

Answer

180°.

Question 5

Which of the following molecules has a polar covalent bond?

Accepted Answer

H₂O.

Answer

O₂.

Answer

Cl₂.

Answer

N₂.

Question 6

What is the molecular geometry of a molecule with two bonding pairs and no lone pairs of electrons on the central atom?

Accepted Answer

Linear.

Answer

Tetrahedral.

Answer

Bent.

Answer

Trigonal planar.

Question 7

Which of the following elements has the highest electronegativity?

Accepted Answer

Fluorine.

Answer

Oxygen.

Answer

Chlorine.

Answer

Nitrogen.

Question 8

What is the difference between sigma and pi bonds?

Accepted Answer

Sigma bonds are formed by head-on overlapping, pi bonds by side-on overlapping.

Answer

Sigma bonds are weaker than pi bonds.

Answer

Pi bonds are stronger than sigma bonds.

Answer

Pi bonds are formed by head-on overlapping.

Question 9

Which of the following compounds is ionic?

Accepted Answer

NaCl.

Answer

H₂O.

Answer

CO₂.

Answer

O₂.