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The Language of Chemistry Chemical Reactions : The Products of a Reaction The equation below shows what happens when chalk (calcium carbonate) is heated
This reaction is an example of chemical decomposition by heat. The two products are calcium oxide and carbon dioxide gas. The gas can be proved to be carbon dioxide by bubbling it through lime water. Lime water is a specific test for carbon dioxide gas. No other gas will make the lime water turn "cloudy" or "milky".
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