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  • Compounds

  • Compound: a substance made up of atoms of different elements joined together (involves a chemical change)

  • Example: *There is no atom of water.*Two atoms of hydrogen join with one atom of oxygen. (chemical bond)*The smallest unit of water is called a molecule.

  • Chemical Formula: the arrangement of symbols and numbers that describe a compound

  • Example: H2O H = Hydrogen How many atoms of hydrogen? 2 atoms of hydrogen

  • O = OxygenIf there is no number behind the element symbol, there is just one atom of that element.

    Therefore, there is only 1 atom of oxygen in H20.

  • NaCl How many elements? 2 Name of elements Sodium, chlorine Atoms of each element Na = 1 Cl = 1 Total # of atoms 2 Name of compound Table Salt

  • Your Turn

  • Other Chemical Formulas

  • one atom of nitrogen two atoms of oxygen NO2 nitrogen dioxide

  • aluminum oxide two atoms of aluminumthree atoms of oxygenAl2O3

  • acetylenetwo atoms of carbontwo atoms of hydrogenC2H2

  • sodium carbonatetwo atoms of sodiumone atom of carbonthree atoms of oxygenNa2CO3

  • glucosesix atoms of carbontwelve atoms of hydrogensix atoms of oxygenC6H12O6

  • ammoniaone atom of nitrogenthree atoms of hydrogenNH3

  • benzenesix atoms of carbonsix atoms of hydrogenC6H6

  • Recipes for Compound Molecules

  • Write the following as a formula: # 1. hydrogen peroxide two atoms of hydrogen, two atoms of oxygen H2O2

  • Here are some formulas. You write out the recipe.

  • # 1. aluminum phosphate AlPO4 one atom of aluminumone atom of phosphorusfour atoms of oxygen

  • Do you know how to read formulas? Read through the following formulas for molecules of different compounds. Then tell how many different elements and atoms are in each molecule.

  • # 4. Fe2O3 # of elements 2 # of atoms 5common name rust

  • Click for Video Clip on Compounds

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