Reactants become products
The identities of substances change because atoms are connected differently.
Energy can be absorbed or released
Bond changes alter how energy is stored in the chemical system.
Rates vary
Temperature, concentration, surface area and catalysts can change how quickly reactions proceed.
Balanced equations track atoms
Stoichiometric coefficients show the proportions required by conservation of matter.
This page explains scientific concepts for general learning. It does not replace laboratory safety procedures, professional engineering guidance, or individualized medical advice.