Question

why did adding mineral oil decrease the volume of bubbles (suds) formed? select the single best answer. mineral oil is polar, so it interacts with the ionic carboxylate end, disrupting the soap micelle. mineral oil is nonpolar, so it interacts with the long nonpolar hydrocarbon chain, disrupting the soap micelle. mineral oil is nonpolar, so it interacts with the ionic carboxylate end, disrupting the soap micelle. mineral oil is polar, so it interacts with the long nonpolar hydrocarbon chain, disrupting the soap micelle.

Explanation:

Soap micelles have a nonpolar hydrocarbon chain (inside, interacting with nonpolar substances) and a polar carboxylate end (interacting with water). Mineral oil is nonpolar. The principle of "like dissolves like" means nonpolar mineral oil interacts with the nonpolar hydrocarbon chain of soap, disrupting the micelle structure, which reduces bubble formation. Let's analyze each option:

• First option: Mineral oil is nonpolar (not polar), so this is wrong.
• Second option: Correctly states mineral oil is nonpolar, interacts with nonpolar hydrocarbon chain, disrupting micelle.
• Third option: Nonpolar can't interact with polar carboxylate end, so wrong.
• Fourth option: Mineral oil is nonpolar (not polar), so wrong.

Answer:

B. Mineral oil is nonpolar, so it interacts with the long nonpolar hydrocarbon chain, disrupting the soap micelle. (Note: In the original options, the second option's text is "Mineral oil is nonpolar, so it interacts with the long nonpolar hydrocarbon chain, disrupting the soap micelle." So the correct option is the second one, with its text as above.)