When water is placed in a balloon, the balloon can be placed over a flame without popping. Water absorbs the heat from the flame, so the rubber of the balloon does not become weak and break like it does with the dry balloon.
Wednesday June 29th, 2011: Casey and Dr. Caran participate in a video shoot involving dry ice and liquid nitrogen demos.
This demonstration makes iron (III) thiocyanate complexes that are deep red in color, resembling fake blood.
This demonstration makes a white precipitate by mixing equal amounts of silver nitrate and potassium chloride.
AgNO3 (aq) + KCl (aq) → KNO3 (aq) + AgCl (s)
When sodium hydroxide is dissolved in water it feels warm, which indicates an exothermic reaction.
NaOH (s) → Na+ (aq) + OH- (aq)
This is a very exciting exothermic reaction that produces a flame and a lot of smoke.
Zn + NH4NO3 → N2 + ZnO + 2 H2O, NaCl is a catalyst
A candle is placed in a crystallizing dish containing water and lit. A beaker is placed upside-down over the candle. The candle will eventually go out and the water level in the beaker will rise.
CxHy (wax) + (x +y/4)O2 (g) → x CO2 (g) + (y/2)H2O (l)
Acetone dissolves a Styrofoam cup because of the principle like dissolves like.
A super saturated sodium acetate solution is poured onto a sodium acetate seed crystal. The seed crystal provides a crystalline structure template for the sodium acetate ions to form on. This is an exothermic process.
This simple activity can make DNA a real and visual thing for students.