Kids at Barnett branch location, Columbus Metropolitan Library. Enjoying hands-on chemistry activity depicting ” yeast elephant toothpaste-decomposition of hydrogen peroxide into water and oxygen”.
Hello professors!
The Demo Lab paid a visit to the Barnett Columbus Metropolitan Library branch. We had so much fun! Activities: Elephant toothpaste (Yeast version), Cats Meow, and Rainbow cups. 😊 But, if you follow us on Instagram, you already knew this (Hint, Hint).
or scan the QR Code:
Today is Friday, May 24th,
…And these are the trendies demonstrations for the upcoming week!
We are currently re-organizing our lab and the chemicals are just as confused of their location as we are … so while they are still (somewhere) on our shelves, order while you can!
Use the link (Password: hydrogen) to order as well as the full list of demos; as always, early orders are very appreciated!
General Chemistry I
Weekly topics
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Exam 2! Good luck Students!
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Electronic Structure of Atoms
Electronic Structure of Atoms
Gas Discharge Tubes of the Noble Gases – show that different gases give different colors when subjected to an electric discharge (H2 tube also available).
Atomic Spectra: Flame Tests – Introduce various metal salts (e.g. NaCl, SrCl2, CuCl2) into an open flame to produce brilliant colors associated with exciting metal cations.
Fireworks Balloons – Show the brilliant colors of metal cations in a fun way by igniting hydrogen balloons containing metal salts.
General Chemistry II
Weekly topics
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Additional Aspects of Aqueous Equilibria.
Buffer Capacity Demo – Contrast the buffer capacity of water, 1 M CH3COOH/NaCH3COO, and 0.1 M CH3COOH/NaCH3COO by adding increments of 6 M HCl to each in the presence of an indicator.
Common Ion Effect Demos –HCl/NaCl – add concentrated HCl (aq) to saturated NaCl(aq) to cause precipitation of NaCl (s).
Complex Ion Formation Ni or Cu – Show color change associated with formation of complex ions. In a tall graduated cylinder of Cu2+ or Ni2+ aqueous solutions, carefully add 6 M NH3 to create a layering effect of [M(H2O)62+ / M(OH)2 / [M(NH3)42+]
-CuSO4 gives a blue / white / dark blue layering
-Ni(NO3)2 gives a green / white / dark blue layering
Amphoteric Hydroxides: Al3+ and Fe3+ – add NaOH to samples of Al(NO3)3 and Fe(NO3)3 to form insoluble metal hydroxides, then add HNO3 and more NaOH to different samples of each to identify which metal hydroxides are amphoteric.
Have a great week!
P.S. If you are ahead/behind of schedule, let us know so we can adjust the demos accordingly. Currently we are simply using the syllabi to guess where your respective classes are at. And here is the link again.
 -The Demo Lab
