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Law of Conservation of Mass Matter cannot be created nor destroyed during a physical or chemical change. The sum of the reactants will equal the sum of the products after a physical or chemical change. Reactants Antoine Lavosier Products: Matter is conserved. Aluminum and Copper Chloride 2Al + 3CuCl2 3Cu + 2AlCl3 Two Aluminum Two Aluminum Three Copper Three Copper Six Chlorine Six Chlorine Reactants EQUAL Products Copper Chloride and Sodium Hydrogen Phosphate 3CuCl2 + 2Na3PO4 ---> Cu3(PO4)2 + 6NaCl 3 Copper 3 Copper 6 Chlorine 6 Chlorine 6 Sodium 6 Sodium 2 Phosphorus 2 Phosphorus 8 Oxygen 8 Oxygen Chemical vs. Physical Chemical Change: reactants mix together to form a new product with different properties Gas is formed Rust is formed Precipitate (solid) formed Physical Change: reactants mix together but product maintains the same properties as the reactants. Melting Freezing Dissolving Chemical vs. Physical Which experiments demonstrated a chemical change? Which experiments demonstrated a physical change?
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