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Why are you instructed to feel the outside of a test tube after 2 chemicals are mixed

Why are you instructed to feel the outside of a test tube after 2 chemicals are mixed
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Why are you instructed to feel the outside of a test tube after 2 chemicals are mixed

User Michael Gaylord
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because you need to see if there is a temperature change so that the test tube doesn't break and spill the dangerous chemicals.
User Mikus
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Because sometimes, depending on the chemicals, you will be able to feel the heat from their chemical reaction. 
User Deco
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