Based on their descriptions, classify these chemical changes as endothermic or exothermic.
Asked by maham237 @ in Chemistry viewed by 355 People
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.