Question

the water is at 50 °C. Now slowly add heat to the sample of water. Let’s start thinking and observing the forces of attraction or “bonds” between the water molecules in the liquid phase. What happens to those bonds between the water molecules as the temperature passes 100 °C? Does this make sense in terms of the observations that were previously made about the types of motion and randomness of the motion between solid and liquid water? Explain.

Answer 1

As heat is added to water , the thermal energy of molecules increases and the they vibrate with increased frequency.As a consequence of increased energetic vibrations , the bond between the water molecules weakens resulting in the increase of bond length.One of the observable physical effects is the fall of density of hot water.Once the temperature crosses 100C , the bonds begin to break and water converts to vapor form. As for the "previous observations", it's not specified in the question.