Question

which of the following would be classified as an endothermic reaction?
burning gasoline
first aid hot pack
formation of snow
ice melting

Explanation:

An endothermic reaction absorbs heat. Burning gasoline releases heat (exothermic). A first - aid hot pack releases heat (exothermic). Formation of snow is a phase change from gas to solid, which releases heat (exothermic). Ice melting (solid to liquid) requires heat absorption.

Answer:

Ice melting.