Question

carbon compounds quick check
why is carbon said to provide a \backbone\ in many molecules? (1 point)
○ carbon atoms have half - full shells of electrons, allowing electrical signals to pass through them easily
○ carbon atoms have full shells of electrons, allowing electrical signals to pass through them easily.
○ carbon atoms have long narrow shapes, allowing many other atoms to attach to them.
○ carbon atoms can form chains and branches with each other, and other atoms can attach to these.

Explanation:

To determine the correct answer, we analyze each option:

• Option 1: Carbon's electron shell (valence shell has 4 electrons, not related to electrical signals for molecular backbone). Eliminate.
• Option 2: Carbon's valence shell is not full (has 4 electrons, needs 4 to fill), so this is incorrect. Eliminate.
• Option 3: Carbon atoms do not have "long narrow shapes" relevant to forming molecular backbones. Eliminate.
• Option 4: Carbon can form covalent bonds to create chains, branches, and rings, and other atoms (like H, O, N) attach to these carbon structures, forming the backbone of many molecules (e.g., organic compounds). This matches the scientific explanation of carbon's role in molecular structure.

Answer:

D. Carbon atoms can form chains and branches with each other, and other atoms can attach to these.