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Thermal chemical equations and their solutions.
This is scientic essay on thermal chemical equations their solutions and the methodology that has been used to arrive at the answers so that to hwelp the students with difficults even though guidance is need to help them achieve the general understanding of the arithmethics.
|language || ||english
|wordcount || ||3018 (cca 8.5 pages)
|contextual quality || ||N/A
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|price || ||free
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Preview of the essay: Thermal chemical equations and their solutions.
Thermochemical equations and their relevant explanations. Many students and other chemical researchers do experience difficulty in some of the chemical and physical calculations. Below are some of the questions, their solutions and explanations of thermal chemical reactions. Thermo chemical equations are just like other balanced equations except they also specify the heat flow for the reaction. The heat flow is listed to the right of the equation using the symbol ΔH. The most common units are kilojoules, kJ. Here are two thermochemical equations: H2 (g) + ½ O2 (g) → H2O (l); ΔH = -285.8 kJ HgO (s) → Hg (l) + ½ O2 (g); ΔH = +90.7 kJ When you write thermochemical equations, be sure to keep the following points in mind: 1. Coefficients refer to the number of moles. Thus, for the first equation, -282.8 kJ is the ΔH when 1 mol of H2O ...
... to the absolute or thermodynamic temperature scale. This corresponds to 0 K or -273.15°C. In classical kinetic theory, there should be no movement of individual molecules at absolute zero, but experimental evidences shows this isn't the case.
➢ Temperature is used to describe how hot or cold an object it. The temperature of an object depends on how fast its atoms and molecules oscillate. At absolute zero, these oscillations are the slowest they can possibly be. Even at absolute zero, the motion doesn't completely stop.
➢ It's not possible to reach absolute zero, though scientists have approached it. The NIST achieved a record cold temperature of 700 nK (billionths of a Kelvin) in 1994. MIT researchers set a new record of 0.45 nK in 2003.
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