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?

An endothermic reaction absorbs heat from its surroundings. As heat leaves the test tube and enters the reaction, the test tube may become cool to the touch. Glowing, a new odor, and forming a solid can be signs of chemical change, but they do not specifically indicate that heat is being absorbed.

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