Law of Conservation of Energy (HSC SSCE Chemistry): Flashcards

Energy cannot be created or destroyed, only transformed

$\Delta H$ same regardless of pathway taken

Calculate $\Delta H$ for hard-to-measure reactions

Sign changes (negative becomes positive & vice versa)

Double the $\Delta H$ value

Halve the $\Delta H$ value

Visual tools showing energy changes in reactions

Independent of pathway (key Hess's law principle)

$-786$ kJ mol$^{-1}$ (for 2 mol)

Conservation of energy principle