the.com/chemical reaction
Atoms swap partners, bonds break and form, and nothing is ever quite the same again.
means A process in which substances transform into different substances through the breaking and forming of chemical bonds, rather than just changing shape or state.
from Chemical traces back through French and Latin to 'alchemy' and ultimately to Arabic al-kīmiyā — itself possibly borrowed from a Greek word, khēmeia, tied to Khēmia, an old name for Egypt and its arts of metalworking. Reaction is the more modern piece: re- ('again') plus action, coined in the sciences to describe matter acting back in response to another substance. So the phrase yokes an ancient, almost mystical word for transformation to a crisp 17th–18th-century scientific term for mutual response — fitting, since that's exactly what happens when atoms meet and rearrange.
- mass check
- atoms rearranged, none created or destroyed
- speed range
- explosions finish faster than rust starts
- energy tell
- bonds breaking cost energy, forming releases it
- catalysts
- speed things up without being consumed themselves