Question

which statement must be mentioned in explaining why amphipathic molecules line up at a water surface? polar groups attract one another. nonpolar groups attract one another. polar groups repel water. nonpolar groups repel water. all of the above. submit request answer part b dissolving is best described as... breaking covalent bonds. molecules breaking into ions. a mingling of molecules and/or ions. a separation of molecules into neutral atoms. a change from a solid to a liquid.

Explanation:

For Part A, amphipathic molecules have both polar and non - polar parts. Nonpolar groups repel water (hydrophobic effect), which causes them to line up at the water surface away from water. Polar groups are hydrophilic and interact with water. For Part B, dissolving is the process where solute molecules or ions mix with solvent molecules. It doesn't necessarily involve breaking covalent bonds (only in some cases like electrolytes dissociating), and it's not about separating into neutral atoms or changing from solid to liquid in the general sense of dissolving.

Answer:

Part A: Nonpolar groups repel water.
Part B: a mingling of molecules and/or ions.