Question 1:

Which of the following elements is most likely to form a covalent bond?

Explanation: Oxygen (O) is most likely to form a covalent bond because it is a nonmetal that readily shares electrons with other nonmetals to achieve a stable electron configuration.

Question 2:

How many electrons are shared in a single covalent bond?

Explanation: A single covalent bond involves the sharing of two electrons between two atoms. Each atom contributes one electron to the bond.

Question 3:

Which of the following is the correct Lewis structure for carbon dioxide (CO2)?

Explanation: The correct Lewis structure for carbon dioxide (CO2) is O=C=O. The central carbon atom shares a double bond with each oxygen atom, and all atoms satisfy the octet rule.

Question 4:

Which of the following molecules exhibits a polar covalent bond?

Explanation: The molecule CO2 exhibits a polar covalent bond. The oxygen atoms have a higher electronegativity than carbon, resulting in an uneven distribution of electron density in the molecule.

Question 5:

Which of the following elements can form multiple covalent bonds?

Explanation: Nitrogen (N) can form multiple covalent bonds. It has five valence electrons and can share three electrons to form three covalent bonds, as seen in the nitrogen molecule (N2).