SECTION 1 Reinforcement Matter and Thermal Energy Directions! Lack sumably al fio poach I mon drian From the dis coledied when a subatonce was hound of a At the start of observations, Point A, the substance exists in the 1. Solid late. The teniperature at this point is 2. Isec As courgy is absorbed, the temperature of the substance rises at a constant rate for two minutes. At Point B, the temperature is 3. 50c and the solid begins to 4. Why It The Temperature remains constant until the change from solid to s._Liquid complete. It has taken three minutes to add enough energy to melt the solid completely, From Point C to Point D, the substance is in the fo_liquid state, Its temperature rises at a constant rate to 7. The temperature remains constant while the liquid changes to a 8. -9ac At Point E, the substance exists as a Its temperature rises evenly as energy is added. When the gascous substance is allowed to cool, it releases energy. The cooling curve will be the reverse of the warming curve. Energy will be released as the substance changes from a 10. 945 toall Liquid and also from a 12. _liquid 10 13. Sold The amount of energy released during condensation will be the same as the amount absorbed during vaporization. Solids, Liquids, and Gases 23