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These are the hottest and trendiest demonstrations for the upcoming week!
The chemicals are absolutely flying off the shelves, so 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 II:
Weekly topics
- Properties of Solutions
- Chemical Kinetics
Suggested Demonstrations
Properties of Solutions:
- Crystallization of Supersaturated Sodium Acetate Solution – Add a tiny crystal of sodium acetate to a 2 L flask of a super-saturated solution to cause the solid to crystallize out, leaving almost no liquid – this demonstration is beautiful and dramatic, as well as being quite exothermic. Alternatively, you can pour the solution slowly over a single crystal to build up a column of solid sodium acetate
- Ammonia Fountain – Show the solubility of NH3 (g) in H2O due to hydrogen-bonding. Alternative: Luminol Ammonia Fountain
- Like Dissolves Like – Contrast the solubility of I2(s) and CuCl2(s) in both water and hexane in large test tubes
- Strong and Weak Acids and Bases – Use two conductivity testers with light bulbs to contrast the conductivity of weak and strong electrolytes: acetic acid and HCl (aq), and/or NH3 (aq) and NaOH (aq)
Chemical Kinetics:
- Combustion of Ethanol Vapors – Allow a small amount of ethanol to vaporize in a large carboy, pour out the excess liquid, and hold a lighted splint to the mouth of the container – the impressive reaction also demonstrates the flammability of organic vapors.
- Iodine Clock Reaction – Perform the iodine clock reaction with three different initial concentrations of IO3–
- Briggs-Rauscher Oscillating Reaction – Introduce the mystery of mechanisms with the Briggs-Rauscher Oscillating Reaction.
Have a great week!
