Question

which of the following diagrams best represents the $c_{2}h_{2}$ after it vaporizes?

Explanation:

Step1: Recall the nature of vaporization

Vaporization is a physical change. In a physical change, the chemical composition of the substance remains the same. So, \(C_{2}H_{2}\) molecules will still exist as \(C_{2}H_{2}\) molecules after vaporization.

Step2: Analyze each option

• Option A: Shows \(C_{2}H_{2}\) molecules. The structure of the molecules is maintained, which is consistent with a physical change (vaporization).
• Option B: Shows individual \(C\) atoms and \(H_{2}\) molecules. This implies a chemical change (breaking of \(C - H\) bonds in \(C_{2}H_{2}\)), which is not the case during vaporization.
• Option C: Shows \(C_{2}\) units and individual \(H\) atoms. This also implies a chemical change (breaking of \(C - H\) bonds), which is incorrect for vaporization.
• Option D: Shows a mix of individual \(C\) and \(H\) atoms in a non - molecular form. This is a chemical change scenario, not a physical change (vaporization) scenario.

Answer:

A. Option A