1. Energy and Matter

2. Energy All living things use energy
Amount of energy in universe remains the same but can change form
Defined as the ability to do work

3. States of Matter Atoms and molecules are in constant motion
Motion and spacing determine
Liquid
Fixed volume and flowing shape
Solid
Fixed volume and shape
Gas
Fill volume of container and no attraction between particles

4. Energy and Chemical Reactions (Metabolism)
Substances change to produce different substances
Energy absorbed or released (bonds)
Reactants (left) and Products (right)

5. Activation Energy
Amount of energy needed for a chemical reaction to begin
Catalysts “jump start” the reaction
Reduces amount of energy needed
Enzymes, proteins or RNA molecules

6. Energy and Chemical Reactions
Constant transfer of energy in and out of living systems
Movement of electrons
Metabolism