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1.3 how is matter classified
 

1.3 how is matter classified

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    1.3 how is matter classified 1.3 how is matter classified Presentation Transcript

    • How is matter classified? 1.3
    • Matter
      • Element: A substance that cannot be separated or broken down into simpler substances.
      • Atom: the smallest unit of an element that maintains the properties of that element.
      • Molecule: the smallest unit of a substance that keeps all the physical and chemical properties of that substance.
    • Matter is divided into two categories:
      • Pure substances only have one kind of atom or molecule.
      • Mixtures are made of more than one kind of molecule.
    • Pure Substances
      • Atoms and elements are pure substances.
      • Compounds are also pure substances but are composed of more than one kind of atom.
        • example: water, (H 2 O,) has 2 hydrogen atoms and one oxygen atom.
        • Compounds can be broken down into their elements.
    • Pure Substance examples
      • Elements: Any element on the periodic table. Gold (Au), Oxygen (O) and 113 more. See back inside cover of your book.
      • Compounds: NaCl, H 2 O, HCl, H 2 SO 4 …
        • see the “compounds you should know” sheet.
    • Mixtures
      • Not “pure” substances.
      • Two or more substances NOT chemically combined.
      • The ratio/proportion in the mixture can change.
      • The properties of a mixture may vary.
      • An Alloy is a mixture.
    • Pure vs. Alloy of Gold
    • Two Types of Mixtures
      • Heterogeneous: not uniform throughout
        • examples:
          • tacos
          • muddy water
          • vegetable soup
          • chocolate chip cookie
      • Homogeneous: uniform throughout
        • examples:
          • Kool-Aid
          • salt water
          • rubbing alcohol
          • air
    • Mixtures vs. Compounds
      • Mixtures:
        • Properties of a mixture Reflect the properties of the materials it contains.
        • No uniform composition
        • Can be separated by physical means.
      • Compounds:
        • Different properties from that of the elements that make up the compound.
        • Definite composition. Definite ratio/formula.
        • Cannot be separated by physical means.
    •