butterflyflower123 (November 30, 1999 at 12:00 am)

Thank you sooooooooooooo much!!!!!!!

Dilbarjani (November 30, 1999 at 12:00 am)

u are amazingggggggg! ur videos help sooo much...im in college and have been teachin myself thru out chem class. cuz my professor isnt good! u break down and teach everything so well..u make chemistry interesting!

sdcf001 (November 30, 1999 at 12:00 am)

Glorious! Chemguy, please keep posting videos like this one they are really helpful for the average chemistry students like me! Thanks so much! Youre truly my hero!

snash96 (November 30, 1999 at 12:00 am)

thanks so much!!! my chem professor sucks and i've got an exam tomorrow.

debit256 (November 30, 1999 at 12:00 am)

great video

Bob132465789 (November 30, 1999 at 12:00 am)

Thanks for this!

kingkrishna (November 30, 1999 at 12:00 am)

chemguy states that in the video if you listen carefully, however there are many other endothermic reactions, such as photosynthesis or Ammonium thiocyanate mixed with barium hydroxide.

ratchetandclank6464 (November 30, 1999 at 12:00 am)

finally, chemistry in words i can understand... better.

jtxwatches (November 30, 1999 at 12:00 am)

Hey chemguy, I love your stuff. Thank you for putting all these videos up here. It's really going to help as I study chemistry for the next few year. One comment about this video though, you compare combustion to water melting and call them both reactions. But only combustion is a reaction, water melting is a phase change, which is just a transfer of heat.

scripturememory (November 30, 1999 at 12:00 am)

My teacher doesn't want me to audio record his voice, much less video him writing on the board. Thank you, Chemguy.