Endothermic Reaction

A chemical demonstration showing that some reactions absorb heat. Carleton University, Ottawa, Canada.

Category:

Howto & Style

Tags:

• Carleton
• University
• Chemistry
• Demonstration
• Endothermic
• Reaction

[peacefulterran]

just an idea: you put all your classes on YouTube. You create a private, on-line school, you make people pay a small fee to pass your exam so they can be credited for the course, and I can finally catch up on the chemistry I never learned :)

[Rastaman12122020]

what a funny grammars

[Brett121000]

~He broke 2 rules.....he didn't wear his glasses at all times and he didn't use both hands to mix the compounds~

[FlamingFox911]

Thanks for putting this on Youtube. I needed this for one of my high school assignments. Much appreciated.

[datulD]

@kevluv93 yes

[kevluv93]

@kevluv93 *positive

[kevluv93]

so if delta H is pozitive you have an endothermic reaction?

[unambitious]

@sgreen71778 The other mole... but thanks anyway :P

[sgreen71778]

@unambitious It's a burrowing mammal.

[shutyourmouth2]

@shutyourmouth2 and by "block of ice", I mean block of wood with water on it. It was a slip of the mind, since the water (on the block) freezes and basically turns to ice...

[shutyourmouth2]

I don't get it... melting a substance is an endothermic reaction, right? Because you put energy into it, it gets, hotter, and it melts. As it absorbs energy, it gets hotter. Ice is colder than water. So an endothermic reaction should feel hot to the touch. Or at least warm... unless it was really cold to begin with.

But this video seems to suggest that endothermic rxn's get colder, because it freezes to the block of ice. How can it freeze AND get hotter to the touch? I'm so confused.

[unambitious]

what is a mole?