Bozeman Science
Enthalpy of Reaction
In this video Paul Andersen explains how the enthalpy of a reaction can be released in an exothermic or consumed in an endothermic reaction. According to Hess's law if the reaction is reversed the sign of the enthalpy of reaction is also...
Professor Dave Explains
Practice Problem: Hess's Law
If we want to find out some information regarding the enthalpy change of a reaction, but we don't want to perform the reaction, we can use Hess's law, which allows us to manipulate thermochemical data for related reactions. Let's...
Professor Dave Explains
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!
Khan Academy
Hess's Law and Reaction Enthalpy Change, Chemistry
Sal introduces students to Hess's Law. The law states that a process's energy change is independent of how we get from one state to another. He sets up a series of reactions and solves them to illustrate the principles behind Hess's Law....
JFR Science
Hess' Law: Enthalpies of Formation
Tired of long, tedious enthalpy calculations? Look no further than Hess' Law! Young chemists discover a shortcut using changes in enthalpy with a video from JFR Science. The narrator talks about the theory behind the law, then performs...
Educreations
Entropy & Free Energy
An understanding of chemical reactions really boils down to two concepts: entropy and enthalpy. Follow along with this instructional video as it explains how these two principles are used to calculate Gibbs free-energy which...
Khan Academy
Khan Academy: Calorimetry and Enthalpy Introduction
An explanation of enthalpy. [11:06]
Khan Academy
Khan Academy: Hess's Law and Reaction Enthalpy Change
Using Hess's Law and standard heats of formation to determine the enthalpy change for reactions. [15:40]
Khan Academy
Khan Academy: Hess's Law Example
An example using Hess's Law to calculate enthalpy change. [12:08]
Khan Academy
Khan Academy: Entropy: Embrace the Chaos
An explanation regarding the disorder and organized states that occur as energy is transferred and conserved within systems and reactions. [12:32]
Khan Academy
Khan Academy: Chemistry: Hess's Law Example
A video lecture showing a step by step procedure for solving a Hess's law problem from a textbook. The problem instructs students to find the enthalpy change using the heat of formation. [12:08]
Khan Academy
Khan Academy: Chemistry: Hess's Law and Reaction Enthalpy Change
A video lecture giving an explanation of Hess's law, the law of heat summation. Understand that whether the process takes places in one or several steps the heat released or absorbed in a chemical process is the same. The video also...
Crash Course
Crash Course Chemistry #18: Enthalpy
A crash course episode introducing what the state function is, and how it varies from a path-dependent function; why enthalpy change is different from heat; and the fact that bonds are energy and to form and break them they release and...
