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    Es2 Es2 Presentation Transcript

    • Atoms to minerals
    • What is an atom?
      atom: the smallest part of an element that has all the properties of that element
      what are some things that atoms have?
      electrons
      protons
      neutrons
    • Atomic Number
      Atomic number = number of protons in an atom
      Mass number = average number of protons and neutrons in an atom
      Atomic number + # of neutrons = mass number
    • Atomic number
      19
      K
      Potassium
      39.098
      Atomic number = 19 = # of protons
    • 92
      U
      Uranium
      238
    • Isotopes
      Isotopes = same element, different # of neutrons
      Example: carbon
      Carbon : has 6 protons
      Carbon 12: has 6 protons, 6 neutrons
      Carbon 14: has 6 protons, 8 neutrons
    • Compounds
      Compound: a substance that contains two or more elements chemically combined.
      Often have different properties
      Examples: H2O, NaCl
    • Mixtures
      Can be separated physically.
      Example: salt water
      How: evaporation
      Compound =/= mixture!
    • What is a mineral?
      A mineral:
      1. occurs naturally
      2. is a solid
      3. has a definite chemical composition (elements are combined in definite proportions)
      4. its atoms are arranged in a pattern (CRYSTALS)
      5. is inorganic (not formed by plants, animals, or other organisms)
    • Examples of minerals
      gold
      diamond
      quartz
      rock salt (halite)
      Each occurs naturally, is a solid, has a definite chemical composition, is arranged in a pattern, is inorganic
    • a mineral
    • Minerals
      Minerals may be elements or compounds
      Most minerals are compounds
      e.g. quartz = silicon and oxygen
      Most minerals are made up of a few common elements
    • Ionic bonds in minerals