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Paper burning releases a large amount of energy, and yet a stack of paper can sit in a room for decades without spontaneously combusting. If the reac

An explosion happens in milliseconds. Iron rusting takes months. A diamond slowly converting to graphite could take longer than human civilization ha

Some reactions release energy and happen instantly on their own, like combustion. Others absorb energy yet still happen spontaneously, like ice melti

Ice melts into water on a warm counter, but liquid water never spontaneously refreezes into ice on that same counter, even though both processes woul

Some reactions can't be measured directly in a calorimeter, either because they're dangerously fast, unreasonably slow, or produce unwanted side reac

Strike a match and it releases heat you can feel. Dissolve certain salts in water and the solution turns noticeably cold. Both are chemical processes