Specific Heat: Bond or Freedom of Degree Based, Or Size?

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SUMMARY

The discussion centers on the factors influencing specific heat in substances, specifically addressing the roles of atomic weight, degrees of freedom, and bond strength. It is established that a higher number of degrees of freedom per atom correlates with increased specific heat, while lighter atoms contribute positively to specific heat values expressed in J/(K*kg). The strength of molecular bonds also plays a crucial role, as it affects the ability to excite vibrational modes in molecules, impacting their specific heat capacity.

PREREQUISITES
  • Understanding of specific heat capacity and its measurement in J/(K*kg)
  • Knowledge of molecular bonding, particularly hydrogen bonding
  • Familiarity with degrees of freedom in thermodynamics
  • Basic principles of atomic weight and its implications on physical properties
NEXT STEPS
  • Research the relationship between molecular structure and specific heat capacity
  • Explore the concept of degrees of freedom in thermodynamic systems
  • Investigate the impact of bond strength on molecular vibrations and heat capacity
  • Study specific heat variations in different substances, focusing on polyatomic molecules
USEFUL FOR

Students and professionals in chemistry, materials science, and thermodynamics who seek to deepen their understanding of specific heat and its influencing factors.

hwall95
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Specific Heat: Bond or Freedom of Degree Based, Or Size??

Okay so I've been trying to understand what causes one substance to have a higher specific heat then other but I've read quite a few conflicting sources in which one says its due to the freedom of degree, while another says the weight of the atom, and then another says its due to the strength of the bonds. For example both ammonia in a solution (NH4+) and water have hydrogen bonding and both have high specific heats, but then they are both larger yet light polyatomic molecules.

So if anyone could shed some light and help me get my head around this, it would be much appreciated. Thanks Heaps :)
 
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More degrees of freedom per atom => higher specific heat
More atoms per mass (lighter atoms) => higher specific heat (expressed in J/(K*kg))
The strength of the bonds can influence the available degrees of freedom. For example, you cannot excite vibrations in N2 molecules at room temperature (in significant amounts), the required energy is too high. With other molecules, it can be possible to excite them.
 

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