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Classification Of Matter
 

Classification Of Matter

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  • There are two kinds of pure substances: elements and compoundsElements are made up of only one type of atom. Examples are copper, aluminum, and hydrogen. All the elements discovered thus far are shown in a periodic table.
  • Compounds are made of two or more elements or atoms. Examples are water, hydrogen peroxide and table sugar. The ratio of the elements in a given compound is fixed. For example, the ratio of hydrogen to oxygen in water is 2 atoms of hydrogen to 1 atom of oxygen. In hydrogen peroxide, hydrogen and oxygen are also combined, but the ratio is 2 atoms of hydrogen to 2 atoms of oxygen. Water and hydrogen peroxide are different compounds with different properties.

Classification Of Matter Classification Of Matter Presentation Transcript

  • Classification of Matter
    Rhodora Snow Ph.D.
  • Definition of Matter
    Has mass and occupies space
    Examples
    Water
    Wood
    Plastic
  • Classification of Matter
    Pure Substances
    Fixed Composition
    Mixtures
    Variable Composition
    Howdoyouturnthison. A plate of dolly mixture. 29 July 2008. http://commons.wikimedia.org/wiki/File:Dolly_mixture.JPG
  • Kinds of Pure Substances
    Elements
    • One type of atom
    • All discovered elements are listed in a periodic table
    Accordion Guy. Periodic Table of Google Images. September 2006.
    http://www.neatorama.com/2006/09/24/
  • Kinds of Pure Substances
    Compounds
    • Made of two or more elements in a fixed ratio
    • Examples
    • Water (2 H: 1 O)
    • Sakurambo. Water molecule. 4 August 2007. http://commons.wikimedia.org/wiki/File:Water_molecule_2.svg
    • Hydrogen peroxide (2 H: 2 O)
    • Benjah-bmm27, Hydrogen peroxide. 5 May 2007. http://commons.wikimedia.org/wiki/File:Hydrogen-peroxide-3D-vdW.png
  • Elements and Compounds
    Compounds may be separated into its component elements.
    Example
    Electrolysis of water
    General Chemistry students of University of Siegen [photographer], Public Domain, http://upload.wikimedia.org/wikipedia/commons/7/78/Elektrolyse1.jpg
  • Mixtures
    • Two or more substances physically mixed
    • Examples are
    • Air (mixture of mostly nitrogen and oxygen)
    • Steel (mixture of iron, nickel, carbon abd chromium)
    • Sugar-Water (two mixtures may look the same but one could taste sweeter because it has a higher ratio of sugar to water)
  • Kinds of Mixture
    Homogeneous
    • small particles
    • Uniform throughout
    • May separate the salt from water by boiling off the water
    Heterogeneous
    • Big particles
    • Can distinguish boundary of particles
    • May separate the nuts and bolts by pouring off the water
  • Classification of Matter