Fundamental principles and concepts of chemistry, including stoichiometry; thermochemistry; atomic and molecular structure; solution chemistry, including acid-base chemistry; quantum theory; bonding ...

A hot gas dissociates very quickly, on the order of microseconds. One might think we could neglect the speed of dissociation, then, and model the gas in an equilibrium state. However, many things ...

A reusable hot pack made of a supersaturated sodium acetate solution that crystallizes spontaneously once triggered by a metal piece releases heat. A balloon filled with hydrogen gas also releases ...