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When water is added to calcium oxide lumps (quicklime), an exothermic reaction takes place. The heat produced is enough to fry an egg.

Quicklime or burnt-lime is a white, caustic, alkaline crystalline solid at room temperature. It is made by the thermal decomposition of calcium carbonate in a lime kiln. Calcination occurs at temperatures in excess of 825 °C liberating carbon dioxide gas in the process. When cooled, the quicklime will spontaneously react with CO2 and moisture from the air until, after enough time, it is completely converted back to calcium carbonate. That's the reason why it is the main component in cement, plaster and other construction materials.

DRIVING QUESTION

What so special about cooking an egg with calcium oxide? Why is it important to add water to the calcium oxide? Does the reaction changes in anyway if water is not add it?

ANSWER 1- Well it shows the reaction of the calcium oxide with water.

ANSWER 2- so that the calcium oxide can react

ANSWER3- Yes! since nothing happens the egg doesn't cook

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