In this experiment, two solid (Ammonium Nitrate and Barium Hydroxide) are added to a beaker. As they react, Ammonia gas, water and Barium Nitrate are produced. This results in a large increase in entropy, which is the measure of randomness in a system. This again causes the temperature to drop, as there is an increase in Enthalpy

A chemical demonstration showing that some reactions absorb heat.

Barium hydroxide + Ammonium thiocyanate

Everyone knows that electricity can be used to generate heat. What most people don't know is that electricity can also be used to generate cold. These two reactions are called exothermic and endothermic. Exothermic means energy is radiated outward. Which usually generates heat or heating. Endothermic means energy is radiated inward which usually generates cold or cooling. Both effects have a distinct sound when done rapidly. Exothermic will have a loud snap or bang. This is because the reaction forces air and energy away from the point of discharge, making a temporary vacuum which is then quickly filled in by the surrounding air, creating a snapping sound. Endothermic however does not make a loud snap or bang. This is because the reaction absorbs energy around it. This makes a ping sound, like when you hit a piece of hollow medal with a vacuum inside. Endothermic discharges are also hard to capture on camera because some of the photons from the discharge are quickly absorbed into the vacuum. More cool videos of stuff they wont teach you in school coming soon!

Endothermic Reaction Event #3 With three films of the event from 3 cameras. Do Not Try This At Home

Endothermic reaction of baking soda with vinegar.

Demo HChem

This video shows a simple explanation of what happens in an Endothermic reaction.

Endothermic Reaction Event Number One - do not try this at home.

Watch it freeze!

Jamming time.. Try lang poh.. walang magawa..

Nothing funny...just an educational film so I don't fail my midterm!

Emo - Punk pa rin.. try niyo..

Emo - Punk pa rin.. try niyo..

Endothermic reaction

Animation on activation energies at exothermic and endothermic reactions.

This tune demonstrates how water needs to have 334 J/g of heat removed to turn it to ice at the freezing point. It shows the exothermic process of freezing and the endothermic process of melting.

This is a tune developed to teach my students about potential energy diagrams, both exothermic and endothermic. I hope it can help you, too! From my CD, "Schrodinger's Cat Strikes Back".

Associate Lecturer Adam van Wynsberghe, UW Madison, demonstrates an endothermic reaction. Before carring out the reaction, he applied a thin layer of water to the top of the board, and placed the beaker on top.

Exhaust Heat Utilisation Device(EHUD). ---------------------------------------------------------- Yes. That is what I would call it and that may be the only name it should be called. What about Heat Energy Assistance Tube(HEAT)? That also sounds right. Paul Pantone's "GEET Engine"(called "Endothermic Reactor" in its previous incarnation) is demonstrated here, including claims of running GEET on Urine, Soda or Water; discovery of new elements not found in periodic tables, MIT's theft of his "invention", Nobel Prize for him and his wife, etc. Paul was a Highschool dropout, a carpenter who gaveup his carpentry job after a serious leg injury. Check ... http://www.geet-pantone.com/newsarticle.html - check the "Marin Independent Journal" Article - After the loss of his primary source of income from carpentry, he started working fulltime on this GEET idea - Blending the exhaust fumes containing heat and carbon-dioxide with water and synthesize a fuel out of it, a technically impossible dream, using a steel rod, which he called "Plasma Electrode". The name Endothermic Reactor was so named for this quest to create the ultimate holy grail in energy. One of GEET's claim is that this will allow a car to run for 100 to 120 miles on a single gallon of gas. Some believers of this technology have reported 80 to 82 miles(but none of them verifiable or demoed to any scientists or engineers) GEET is also manufactured as SPAD in FRANCE and other european countries with some modifications. A Layman's Review of the GEET System is below: ---------------------------------------- Global Environmental Energy Technology (GEET) is a composition of unique fuel system components that allow an internal combustion engine's fuel efficiency to be increased substantially while dramatically reducing its toxic & greenhouse gas emissions by 90 % or more. Individuals have reported a 20% to 800% increase in fuel efficiency. The toxic exhaust reductions are so extraordinary that there have even been reports of GEET modified engines running for hours inside closed rooms with many people present without any known ill effect to person, plant or animal. --Poster's Comment:(Please note that as per Geetfriends.com, Paul Pantone was hospitalized due to carbon monoxide poisoning and GEET may have caused his brain damage due to this). GEET allows the by-products of combustion to be recycled back into the intake of the internal combustion engine through a system of unique components. Basic components are as follows: 1. A GEET modified carburetor 2. The GEET reactor chamber 3. The "Air Mix Valve" (AMV) 4. The "Bubbler" 5. The bubbler control mix valve All that GEET needs is water to run the engine. The process is simple: Combusted gasses are introduced into the GEET outer/exhaust reactor chamber causing a voltage build-up in the chamber. The voltage build-up also has its associated magnetic field. The combined exhaust and bubbler [fuel/air mixture (primarily water and exhaust gasses)] components entering the inner/intake chamber of the reactor chamber pass through this same electro/magnetic field and are recombined into a combustible mixture and subsequently re-induced back into the engine via the modified GEET carburetor. The bubbler control valve controls the mixture of exhaust gasses returning to the engine and the Air Mix Valve (AMV) controls the amount of fresh air added to the reactor mixture returning to the engine. ------------------------------------------ In order to read the news articles about this contraption, I urge you to read the articles in the following link, specifically "Marin Indepedndent Journal" Dt: Nov 07, 1992 located at: http://www.geet-pantone.com/newsarticle.html As per the news article referred to above, the theory behind this contraption violates 2 out of 3 laws of thermodynamics and law of relativity. Paul counters that argument saying that 'science is the enemy of progress'. Tests conducted at Shell Emission labs and financed by the newspapers who have bought this story shows that a single engine lawn mower GEET produces as much pollution as a six cylinder engine and torque about half(This may be noted from the same Marin Indepedndent Journal report referred to above) Fraud Case details are here: http://www.phact.org/e/z/PantoneSecuritiesFraud.htm and http://en.wikipedia.org/wiki/Paul_Pantone

Endothermic and exothermic reactions..

chemical reaction - endothermic

Dr. Diana teaches you how to make ice cream at home in ten minutes without fancy equipment.

A little lesson on the afterlife. A simple presentation on a theory that some may know and some not..... Enjoy, and see you in hell!!

Chemguy explains exo and endothermic reactions; calorimetry. www.chemguy.com