Heat Capacity Research Paper

Pages: 4 (1119 words)  ·  Bibliography Sources: 3  ·  File: .docx  ·  Level: College Junior  ·  Topic: Chemistry

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Heat capacity, C of any given system is also noted to be the ratio of the heat that can either be added or effectively withdrawn from the given system in order to give rise to the resultant temperature.

C = ?Q/?T = dQ/dT [J/deg]

This type of definition is however noted to be valid in the absence of any form of phase transitions.

Heat Capacity is noted as the measure of a material's ability to absorb a given amount of thermal energy.

Thermal energy = the kinetic energy of the atomic motions +The potential energy of distortion of the interatomic bonds.

The higher the value of T, the larger the mean atomic velocity and corresponding the amplitude of the atomic vibrations. The outcome is the general rise in the level of thermal energy.

The temperature dependence of the concept of heat capacity

Heat capacity is noted to have a very weak temperature dependence at very high temperatures. This is noted to be true at temperatures that lie above the Debye temperature ?D.It however decreases towards zero as the value of T. approaches zero Kelvin.

The constant value of this quantity ( heat capacity) of several solids is referred to as the Dulong-Petit law. Sometimes in 1819, an experiment performed by Dulong and petite found that for several solids at room temperature, cv ? 25 JK-1mol-1.

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This is noted to be consistent with the outcome or theoretical standings of the equipartition theorem of the classical mechanics theories which states that the energy which is added to solids are presented in the form of atomic vibrations with the potential and kinetic energy being associated with each atom's three degrees of freedom.

How the phase of a substance (ie solid, liquid, or gas) changes its heat capacity

Research Paper on Heat Capacity Is Defined by Assignment

Whenever a given material undergoes a change in phase such as from solid to liquid to gas, the heat capacity of such a material is never well defined and the material's heat capacity is technically indicated to be indefinite due to the fact that the heat goes into the given material but the material's temperature remains constant. Due to this fact, the meaning of heat capacity is often restricted to a single phase.

The explanation is that as a solid approaches liquid phase, it begins to soften while the frequency of the modes experience a drop. The heat capacity is therefore noted to increase.The hat capacity of a liquid is however noted to be a bit complex. This is due to the fact that there exists several local clusters of low energy vibration modes which can be excited thermally. The conversion of the substance's frequency modes to the rotational and translational modes is never straightforward.

How temperature is a measure of the kinetic energy of the molecules in a substance

Temperature is noted as a measure of the average kinetic energy of the atoms or molecules of a given substance expressed in terms of degrees that are designated on a standard scale (Mifflin,2000).

References

Cengel, Y.A (2007). Introduction To Thermodynamics and Heat Transfer.MacGraw Hill

Laider, K.J. (1993). The World of Physical Chemistry. Oxford University Press. ISBN 0-19-855919-4.

Roninson, G, R and Hass, J.L (1983)Heat capacity, relative enthalpy, and calorimetric entropy of silicate minerals: an empirical method of prediction. American Mineralogist, Volume 68, pages 541-553, 1983 [END OF PREVIEW] . . . READ MORE

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