Based on their descriptions, classify these chemical changes as endothermic or exothermic. 1) A chemical change takes place in a container, making it feel cold to touch. 2) Burning wood 3) A chemical change takes place in a container, making it feel hot to touch. 4) Pocket hand warmers(used by skiers) start out at room temperature. When you open the air tight packaging, a substance reacts with air, and it quickly begins to feel hot. 5) A "cold pack" (used for sport injuries) starts out a room temperature. But when you squish the liquid around, you cause two substances to mix that were originally kept separate. Those substances react and the pack begins to feel cold.
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