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  Solvatochromism is defined as the ability of a chemical substance to change its color by changing the solvent polarity. Reichardt’s dye is the most known substance with such ability, and is used on this video. The substance is green in acetone, blue in isopropanol, violet in ethanol and red in methanol. We can explain […]

In this experiment we heated sodium acetate trihydrate (CH3COONa x 3H2O) in the flask. Salt melting point is above room temperature, at 54°C/130°F. When the entire quantity of the salt we used melted, it gave a supersaturated solution of sodium acetate in its own crystal water that was left to cool down spontaneously. A supersaturated […]

Thermite mixture is a mixture of aluminum powder and iron(III) oxide. Aluminum does not react with iron(III) oxide at room temperature. However, the reaction is extremely violent if previously initiated by the heat of burning magnesium ribbon. This highly exothermic reaction can be described with the following equation:     The very negative enthalpy of […]