Notes On Chemical And Physical Change

1. Particles do not change, just changing spacing or other parameters of the Particles
2. occurs when one or more physical properties of a substance are changed but without any change in the substance's chemical properties or composition
3. no new substance is formed
4. all changes of phase are physical changes (from solid to liquid to gas)

Chemical Change

1. Particles does change and creates a new set or set(s) of particles (grouping of atoms). Usually this is accomplished by valence electrons being shared or transferred between atoms differently than before.
2. is any change that results in the production of one or more substances that differ in chemical properties and composition from the original substances
3. examples are the rusting of iron, the souring of milk, the burning of paper

Changes in Energy

1. every change, either physical or chemical, involves an energy change
2. generally the energy changes that accompany physical changes are not as noticeable as those that accompany chemical changes
3. energy can be released (exothermic) or consumed (endothermic) during the reaction

IMPORTANT: Lavoisier's principle of the Law of Conservation of Mass states that "matter cannot be created or destroyed by a chemical change."