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1. What is latent heat? 2. Why does the temperature of H2O not increase when it is boiling? Explain your answer by drawing a heating/cooling curve for water. 3. Describe the difference between latent heat of fusion versus latent heat of vaporization. Which process involves energy being absorbed? 4.
Heat with Phase Change Worksheet. 1) How many joules are required to heat 250 grams of liquid water from 00 to 1000 C ? 2) How many joules are required to melt 100 grams of water? 3) How many joules are required to boil 150 grams of water?
The heat needed to change the temperature of a given substance (with no change in phase) is: q = m × c × ΔT (see previous chapter on thermochemistry). The heat needed to induce a given change in phase is given by q = n × ΔH. Using these equations with the appropriate values for specific heat of ice, water, and steam, and enthalpies of ...
Melting a solid requires an input of energy (at constant temperature) to loosen up the molecular or atomic bonds. Vaporizing a liquid involves an input of energy to increase the separation between molecules. Here, the latent heat involves a change in internal energy, plus work in expanding the volume.
Phase Change Worksheet Key. Part 1: Label the diagram below with the following terms: Solid, Liquid, Gas, Vaporization, Condensation, Freezing, Melting. Condensation. Vaporization Gas. Melting Liquid. Solid. Part 2: The graph was drawn from data collected as a substance was heated at a constant rate.
Worksheet 14A: Specific Heat, Latent Heat, Phase Change Graphs, and Calorimetry . Objective A: Caloric and Joule’s discovery Questions: 1. What was the caloric model? 2. How did it fail to explain the heating of drill bits when they got dull? Objective B: Specific Heat: Q = mC T Questions:
Phase Change Descriptions: Melting the change from solid to liquid. Freezing the change from liquid to solid. Vaporization the change from liquid to gas. Evaporation vaporization from the surface of a liquid. Boiling vaporization from within as well as from the surface of a liquid. Condensation the change from gas to liquid. Sublimation
