Exothermic and Endothermic Reactions (Grade 11 NSC Matric Physical Sciences): Flashcards

$\Delta H$

$\Delta H = E_{\text{products}} - E_{\text{reactants}}$

Releases energy to surroundings

Negative ($\Delta H < 0$)

Absorbs energy from surroundings

Positive ($\Delta H > 0$)

Become warmer

Become cooler

Combustion or hand warmers

Cold packs or evaporation of water