Table 14.2 Heats of Fusion and Vaporization 14 Lf Lv Substance Melting point (°C) kJ/kg kcal/kg Boiling point (°C) kJ/kg kcal/kg 5.23 1.25 58.6 14.0 |-269.7 |-268.9 4.99 Helium 20.9 Hydrogen -259.3 -252.9 452 108 Nitrogen Охудеn -210.0 25.5 6.09 -195.8 201 48.0 -218.8 13.8 3.30 -183.0 213 50.9 Ethanol -114 104 24.9 78.3 854 204 Ammonia |-75 108 -33.4 1370 327 Mercury -38.9 11.8 2.82 357 272 65.0 Water 225615) 5396) 0.00 334 79.8 100.0 Sulfur 119 38.1 9.10 444.6 326 77.9 Lead 327 24.5 5.85 1750 871 208 Antimony 631 165 39.4 1440 561 134 Aluminum 660 380 90 2450 11400 2720 Silver 961 88.3 21.1 2193 2336 558 Gold 1063 64.5 15.4 2660 1578 377 Copper 1083 134 32.0 2595 5069 1211 Uranium 1133 84 20 3900 1900 454 Tungsten 3410 184 44 5900 4810 1150
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
In a physics classroom demonstration, an instructor inflates a balloon by mouth and then cools it in liquid nitrogen. When cold, the shrunken balloon has a small amount of light blue liquid in it, as well as some snow-like crystals. As it warms up, the liquid boils, and part of the crystals sublimate, with some crystals lingering for awhile and then producing a liquid. Identify the blue liquid and the two solids in the cold balloon. Justify your identifications using data shown..
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