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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

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User Michael Gaylord
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2 Answers

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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.
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User Mikus
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6 votes
Because sometimes, depending on the chemicals, you will be able to feel the heat from their chemical reaction. 
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User Deco
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