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17 March, 14:39

During an experiment, Mr. Lehman tells his students to be alert for signs that an endothermic reaction is happening. Which of the following scenarios would his students most likely observe? A test tube becomes cool to the touch. A liquid appears to glow. A new odor comes from a beaker. A solid forms from a mixture of solutions.

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  1. 17 March, 15:01
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    a test tube becomes cool to the touch
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