RISE Science Grade 8 Practice Questions - RISE Science - Grade 8 Exam

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A hiker activates an instant hand warmer pouch by squeezing it to mix iron powder, water, and salt. Within minutes, the pouch feels warm to the touch. What type of reaction is occurring inside the pouch?

An endothermic chemical reaction that absorbs thermal energy from the hiker's hands. An exothermic chemical reaction that releases stored chemical energy as thermal energy. A physical phase change where liquid water freezes into solid ice. A nuclear reaction that converts iron atoms into helium gas.

Correct Answer:

An exothermic chemical reaction that releases stored chemical energy as thermal energy.

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