What triggers a chemical reaction? - Kareem Jarrah
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- Опубліковано 19 січ 2015
- View full lesson: ed.ted.com/lessons/what-trigge...
Chemicals are in everything we see, and the reactions between them can look like anything from rust on a spoon to an explosion on your stovetop. But why do these reactions happen in the first place? Kareem Jarrah answers this question by examining the two underlying forces that drive both endothermic and exothermic chemical reactions: enthalpy and entropy.
Lesson by Kareem Jarrah, animation by Flaming Medusa Studios Inc.
i to love it when i pour vinegar in baking soda and my oven explodes
How are people actually being serious about this video?
Who cooks a hotdog with the condiments already on it?
I'm watching basketball ---- > Chemical reaction
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I always trip and my baking soda and vinegar mix together then my oven explodes. Happens to my all the time.....
but how and why does entrophy increase?
would have loved it if they included a few examples where entropy and enthalpy changes of different sizes pointed in the different directions versus the same direction to show how the balance of these determine which reactions occur spontaneously.
great video, but i just want to add a few things: the potential energy stored in chemical bonds is internal energy, not enthalpy. but enthalpy is the sum of the internal energy and the product of pressure and the changing of volumes in the system (H = U + pV). the product of a chemical reaction has an internal pressure that leads to pushing it's volume away. that way it's performing an extra amount of energy. i always find it hard to image entropy. it's highly misleading when you define it only as 'a measure of chaos'. entropy is fundamentally linked to temperature. it tells us in which direction the energy of a system is flowing and it cannot be destroyed, it can only be created. entropy tells us that high temperature gases always flow into colder temperatures, not the other way around.
I love how he's casually like, " you know when you pour your baking soda into the vinegar jug and your oven explodes"
This video is really good since it explains clearly with the golf metaphor and the other examples, it mases it easier to understand and, also the animationas are pretty good and make the video more enjoyable and funnier.
Thank you so much for making such useful videos for students
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People might relate entropy and disorder but these are different concepts. One way to think of entropy is via a probability distribution. If I am concerned with heat capacity/stability, I can think about the number of different vibrations that can be stimulated by energy. If I am concerned with reactions, I can think of the different states I can transmit through the TS or the "width" of my TS.
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awesome channel!
great video!
great vid man