PSAT Reading Question 557: Answer and Explanation

Question: 557

Based on the table and the passages, the molecular behavior of an acetic acid molecule introduced to a strong electromagnetic field will most likely resemble that of

• A. a stove.
• B. a gas range.
• C. a fire.
• D. a magnet.

Correct Answer: D

Explanation:

(D) Based on the table, acetic acid is a polar substance. Lines 13–17 of the passage state, "Polar molecules, like a bar magnet, possess an electrical dipole moment, and, when introduced to a strong enough electromagnetic field, will align their positive and negative ends appropriately." Although the other choices are mentioned in the passage, they are not cited as models for the molecular behavior of a polar molecule.