Based on their descriptions, classify these chemical changes as endothermic or exothermic.
-A chemical change takes place in a container, making it feel hot to the touch.
-A chemical change takes place in a container, making it feel cold to the touch.
-A "cold pack " (often used for sports injuries) starts out a room temperature. But when you squish the liquid around, you cause two substances to mix that were originally kept separate. When those substance react, the pack quickly begins to feel cold.
-Pocket hand warmers (often used by skiers) start out at room temperature. When you open the air-tight packaging, a substance (contained in a cloth pouch) reacts with air, and it quickly begins to feel hot.
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Our tutors rated the difficulty ofBased on their descriptions, classify these chemical changes...as low difficulty.