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Cornell Notes: Please take out your notebook and properly set up your paper. Topic: Phase Changes Date: 9/20/2012 Physical vs. Chemical Changes Phase changes are all classified as physical changes because in chemical changes an entirely new substance is produced. In chemical changes, the compounds rearrange to form new compounds. In physical changes the compounds don’t change at the molecular level. Energy (usually in the form of heat) Energy is added or taken away to create phase changes. When energy is added, particles move further apart. Solid Liquid Gas When energy is taken away, particles move closer together. Gas Liquid Solid Phase Changes Melting = solid liquid Freezing = liquid solid Boiling / Vaporization / Evaporation = liquid gas Condensation = gas liquid Sublimation = solid gas (ex: dry ice) Deposition = gas solid (very rare) Temperature and Pressure Points of change Melting Point = T & P when solid liquid Freezing Point = T & P when liquid solid Boiling Point = T & P when liquid gas Condensation Point = T & P when gas liquid Phase Change Diagram LIQUID deposition SOLID sublimation GAS