PP Presentation

CHEMICAL ENERGY

Chemical bonds are a source of energy

BOND BREAKING - requires energy
BOND MAKING - releases energy

. . . reaction is EXOTHERMIC

if more energy is used in breaking bonds than is released in

forming bonds then

. . . reaction is ENDOTHERMIC

Energy can be provided by

- LIGHT - photochemistry

- WORK - electrochemistry

- COOLING of surroundings

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Notes:

DEMONSTRATIONS:

Thermite reaction

Al + Fe2O3 -> Al2O3 + Fe

SPONTANEOUS HEAT, LIGHT reaction

Luminol

SPONTANEOUS LIGHT EMITTING REACTION