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Thermodynamic Calculations: Hess's Law
Thermodynamic Calculations: Hess's Law
Objectives
Objectives
(CLO4). Interpret and utilize mathematical formulas while solving problems
(MLO8) Use Hess's law, enthalpies of formation and bond energies to calculate heats of reactions or perform energy calculations that accompany reactions.
The activity document is available at https://docs.google.com/document/d/1OfTWOgFQUrC7oF0FtRyZ3koNvrfOflMxH6LugIvE1ME
Activity 14 discussion.mp4This video is a discussion of Hess's Law and Activity 14
Tyler DeWitt's video on Thermochemical Equations Practice Problems
Introduction to Thermochemistry and Enthaply - https://youtu.be/g6zUA-3f8pw
Tricky Question: Exothermic or Endothermic? - https://youtu.be/i3mYWB2fNp4
Phase Changes: Exothermic or Endothermic - https://youtu.be/0cUK4jcAEaU
Food Calorimetry Lab: Explanation - https://youtu.be/uv7sVIqgyqU
Food Calorimetry Lab: Calculations - https://youtu.be/Ak7PN8tn4cU
Food Calorimetry: Common Mistakes - https://youtu.be/1Ml-Bg81BVI
Thermochemical Equations Practice Problems - https://youtu.be/8m_FCe5aCqY
A simulation showing the addition of reactions and the resulting Enthalpy of reaction:
Chemistry demonstrations
new: http://billvining.com/mmlib_sims/#gen_5_5
(flash) http://employees.oneonta.edu/viningwj/sims/hess_law_s.html is the simulation of Hess' Law which is a flash program.
Hess' Law Practice problems
Hess' Law Practice problems
You can use the tutorial at https://science.widener.edu/svb/tutorial/hesslawcsn7.html to solve problems and get feedback on your answer solving problems like Question 9 on the activity.
Enthalpy of Formation:
Enthalpy of Formation:
A tutorial on how to calculate the enthaply of reaction using enthalpy of formation: https://courses.lumenlearning.com/cheminter/chapter/calculating-heat-of-reaction-from-heat-of-formation/
The purpose of this calculator (https://www.shodor.org/UNChem/advanced/thermo/thermocalc.html) is to calculate the value of the enthalpy of a reaction (delta H) or the Gibbs free energy of a reaction (delta G).
Another calculator is https://www.omnicalculator.com/physics/Enthalpy
We can calculate the enthapy of reaction using enthalpy of formation. This tutorial shows you a problem and has several examples.
Hess's law and reaction enthalpy change | Chemistry | Khan Academy
Hess's law and reaction enthalpy change | Chemistry | Khan Academy
Using Hess's Law and standard heats of formation to determine the enthalpy change for reactions. Created by Sal Khan.
Hess's law example | Thermodynamics | Chemistry | Khan Academy
Hess's law example | Thermodynamics | Chemistry | Khan Academy
Hess's law example. Created by Sal Khan.
Heat of formation | Thermodynamics | Chemistry | Khan Academy
Heat of formation | Thermodynamics | Chemistry | Khan Academy
Standard heat of formation or standard enthalpy change of formation. How heats of formation are calculated. Created by Sal Khan.
Hess's Law and Heats of Formation
Hess's Law and Heats of Formation
How can we calculate the enthalpy change of a reaction without doing it? There are two easy ways! This is how we can make sure a reaction won't explode in our faces!
Bond Dissociation Energies
Bond Dissociation Energies
Bond Length and Bond Energy
Bond Length and Bond Energy
052 - Bond Length and Bond Energy
In this video Paul Andersen explains how the bond length and bond energy are calculated using an energy distance graph. The strength of the bond is determined by the charges in the constituent atoms. As the charge increases the bond energy increases and the bond length decreases. Increasing numbers of bonds will also increase the energy and decrease the length.
Bond enthalpy and enthalpy of reaction | Chemistry | Khan Academy
Bond enthalpy and enthalpy of reaction | Chemistry | Khan Academy
Introduction to bond enthalpy, and how to use bond enthalpies to calculate enthalpy of reaction.
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