Section 01
Exothermic vs endothermic
Exothermic reactions release heat (combustion, freezing). Endothermic reactions absorb heat (photosynthesis, melting).
Section 02
Enthalpy (ΔH)
ΔH is the heat exchanged at constant pressure. Negative ΔH = exothermic, positive ΔH = endothermic.
Section 03
Calorimetry
q = m·c·ΔT lets you calculate heat absorbed by a substance given its mass, specific heat, and temperature change.