Professor Dave Explains
IIT/JEE Chemistry Practice #25: Enthalpy of Formation
Practice REAL problems from actual past IIT/JEE exams with Professor Dave!
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
Practice Problem: Free Energy and Nonstandard Conditions
We know that a lot of thermodynamic data is collected under standard conditions, but sometimes we will want to assess the free energy change associated with a process that is not occurring under standard conditions. Any other conditions...
Professor Dave Explains
The Third Law of Thermodynamics: Absolute Zero
Brr, it's so cold today! Could it get any colder? Is there a coldest possible temperature? Yes, there is! That seems strange, but now we know that temperature is just a measure of kinetic energy, so zero kinetic energy must mean zero...
Physics Girl
5 Awesome Science Party Tricks!
Check back next week for an explanation of these 5 physics party tricks!
Professor Dave Explains
Practice Problem: Calculating Free Energy Change
We know that the free energy change associated with a process will tell us whether it is spontaneous or not. And we also know that this depends on the change in enthalpy and the change in entropy for that process, as well as the...
Curated Video
Can We Really Build Cars That Run Only On Water?
While it is certainly enticing when a company or individual claims that they have developed technology that can power cars purely on the water when it comes to science, there is a fundamental restriction to this very idea. Simply put,...
Catalyst University
General Chemistry | Heat Capacity (q=smΔT) [Example 2]
Here, we perform a sample calculation for heat capacity in which we solve for a temperature (T) using q=smΔT.
Professor Dave Explains
The Zeroth Law of Thermodynamics: Thermal Equilibrium
You've heard of the laws of thermodynamics, but did you know there are actually four of them? It's true, and since they already had laws one, two, and three, but then wanted to formulate another more fundamental one, the number right...
Catalyst University
General Chemistry | Enthalpy of Reaction (ΔH_rxn) [Example 1]
Here is one example in which we calculate enthalpy of reaction (ΔH_rxn).
Mazz Media
Introduction to Thermochemistry
This video begins with real world examples of heat transfer involving energy changes from chemical potential energy. The program shows exothermic reactions which occur such as a gasoline engine, wood on a campfire and athletes running....
Catalyst University
Virial Equation of State & The Boyle Temperature
Virial Equation of State & The Boyle Temperature
Curated Video
The Wonders of Stars and Constellations
Stars are much bigger and complex than they look from Earth. Learn how they form and how they are classified.
ATHS Engineering
Thermodynamics: Thermal Equilibrium Calculations
This is explains how to calculate energy changes when two substances are in thermal equilibrium and one system does work on the other. The teacher provides examples and walks through the calculations step-by-step, preparing students for...
ATHS Engineering
Thermodynamics: Insulation
This video explains how to use the U-value and R-value equations to make a house more energy-efficient. He provides examples of how to increase insulation and use reflective material to improve the R-value. By doing so, homeowners can...
Professor Dave Explains
Practice Problem: Calorimetry and Specific Heat
In calorimetry experiments we measure heat transfer. Say we take a hot piece of metal and put it in some cold water, and measure the rise in temperature of the water as the system equilibrates. Can you use this information to calculate...