User:Ebeginnings/sandbox

Basic intro

The enthalpy of mixing is the enthalpy liberated or absorbed from a substance upon mixing. (1) When a substance or compound is combined with any other substance or compound the enthalpy of mixing is the consequence of the new interactions between the two substances or compounds. (1) This enthalpy if released exothermically can result in an extreme case cause an explosion.

-No equations

-Try to keep lower level terminology

Table of Contents

-intro

In-depth summary

When two substances are mixed the resulting enthalpy is not an addition of the pure component enthalpies, unless the substances form an ideal mixture. (2) The interactions between each set of molecules determines the final change in enthalpy. For example, when compound “x” interacts more strongly with compound “y” the resulting enthalpy is exothermic. (2) In the case of alcohol and its’ interactions with a hydrocarbon, the alcohol molecule participates in hydrogen bonding with other alcohol molecules, and these hydrogen bonding interactions are much stronger than alcohol-hydrocarbon interactions, which results in an endothermic heat of mixing. (3)

Calculations

enthalpy of mixing is often calculated experimentally using calorimetry methods. The equation below takes into account the pure enthalpies of each substance and then experimentally measures the value of the final fully mixed state and the difference between the two values is the enthalpy of mixing.

-Relevant Equations

--    H = xaha + xbhb + delhmix

-Variable definitions

-Example calculations

-Simple case

-Extreme case

Limits of components

Mechanism

Continuum vs microscopic scale

Intermolecular Forces

Difference from Bond-dissociation energy

Leonard Jones-esque potential

Derivation of relevant Laws

Tabulated Values

Appendix/References

unformatted sources:

-Source 1

https://app.knovel.com/web/view/swf/show.v/rcid:kpHCHE0002/cid:kt003WNT31/viewerType:pdf/root_slug:hazardous-chemicals-handbook-2?cid=kt003WNT31&page=8&b-q=enthalpy%20of%20mixing&sort_on=default&b-subscription=TRUE&b-group-by=true&b-search-type=tech-reference&b-sort-on=default&scrollto=Enthalpy%20changes%20on%20mix&q=enthalpy%20of%20mixing

-source 2

- http://www.et.byu.edu/~rowley/ChEn273/Topics/Energy_Balances/Nonreacting_Systems/Nonideal_Mixtures/Heat_of_Mixing.htm

-source 3

-http://pubs.acs.org/doi/abs/10.1021/je60028a009

miscelaneous notes

add in a hyperlink to enthalpy of solution(dissociation)