Heating Curve for Water

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Presentation transcript:

Heating Curve for Water gas D 100 C liquid Temperature (oC) Melting, freezing, vaporization, condensation, sublimation, and deposition are six common phase changes. Note: The temperature of a substance does not change during a phase change. B A solid Heat added LeMay Jr, Beall, Robblee, Brower, Chemistry Connections to Our Changing World , 1996, page 487

Heating Curve for Water vaporization E gas D 100 condensation C liquid melting Temperature (oC) Melting, freezing, vaporization, condensation, sublimation, and deposition are six common phase changes. Note: The temperature of a substance does not change during a phase change. B A freezing solid Heat added LeMay Jr, Beall, Robblee, Brower, Chemistry Connections to Our Changing World , 1996, page 487

Latent Heat Take 1 kg of water from –10 oC up to 150 oC we can plot temperature rise against absorbed heat steam (water vapor) 100 C ice water 0 C -10 C Lf = 80 cal/g Lv = 540 cal/g Q heat absorbed Lf is the latent heat of fusion Lv is the latent heat of vaporization