Free energy
The energy in a system that is available for work
States of matter
Solid liquid gas
Exergonic reactions
Chemical reactions that involve a net release of free energy
Endergonic reactions
Reactions that involve a net absorption of free energy
Activation energy
The amount of energy needed to start a reaction
Catalysts
Reduce the amount of activation energy that is needed for a reaction
Enzymes
An important class of catalysts in living things. A single organism may have thousands of different enzymes, each one tailor made for a different chemical reaction
Energy
The ability to do work or cause change