Final answer:
When NaCl enters water, the intermolecular forces broken are the ion-dipole interactions between Na+ ions and water molecules.
Step-by-step explanation:
The intermolecular forces (IMFs) broken when NaCl enters water are the ion-dipole interactions between the Na+ ions and the polar water molecules. When NaCl dissolves in water, the positive Na+ ions are attracted to the negative oxygen atoms of the water molecules, while the negative Cl- ions are attracted to the positive hydrogen atoms of the water molecules. These attractive forces overcome the ionic lattice energy of NaCl, allowing it to dissociate into individual ions and form a solution.