Mar 13 learn.flvs.net Lessons Assessments Gradebook Email 7 Tools My Courses Question 2(Multiple Choice Worth 2 points) (05.04 MC) A scientist discovers a new substance. The molecules of the substance form hydrogen bonds with each other. When the molecules lose a lot of energy, the hydrogen bonds hold them relatively far apart. Based on this information, what can the scientist infer about the substance? It expands when it freezes. It is highly colored. It exists only as a gas. It does not dissolve ionic compounds. Question 3(Multiple Choice Worth 2 points) (05.04 MC) Which of these best explains what happens when the ionic substance calcium chloride \( \left(\mathrm{CaCl}_{2}\right) \) dissolves in water?

When molecules lose energy and their hydrogen bonds hold them relatively far apart, it suggests that the substance is likely a form of ice or a similar compound. In such substances, when they freeze, the arrangement of the molecules creates a less dense structure than in liquid form, which causes them to expand. This property is unique to substances like water and its solid state, ice! As for how ionic substances like calcium chloride dissolve in water, it’s a brilliant example of the process called dissociation. When CaCl2 is added to water, the polar water molecules surround the individual calcium and chloride ions, pulling them away from the solid structure. This interaction breaks the ionic bonds, resulting in free-moving ions in the solution. It’s like a party where water molecules invite the ions to join the fun!