Etec5303 Proj
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Etec5303 Proj

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Etec5303 Proj Etec5303 Proj Presentation Transcript

  • Characteristics of Matter
  • Characteristics of Matter
    • Physical/ Chemical Properties
    • Mixtures/ Pure Substances
      • Group Characteristics of elements from Periodic Table
    • Forms of Matter
      • Characteristics of solids, liquids, gases, plasmas
  • Physical properties
    • Properties that do not change the chemical nature of matter
    • Examples:
      • melting point
      • Color
      • density
      • boiling point
      • odor
      • hardness
      • freezing point,
    • Note that measuring each of these properties will not alter the basic nature of the substance.
  • Chemical properties
    • Properties that change the chemical nature of matter
    • Characteristics which are exhibited as one substance is chemically transformed into another
    • Example
      • Iron rusting. When iron (an element, symbol = Fe) rusts, it combines with oxygen to form a reddish-colored compound called ferric oxide (formula = Fe2O3)
  • Mixtures and Pure Substances
    • All matter can be separated into two categories by asking the question "Is only one chemical substance present in the sample being considered?"
      • YES - Pure Substance
      • NO - Mixture
    • A mixture is one in which two or more pure substances retain their chemical identity.
      • For example, if you dissolve some sugar into water, the sugar molecules and water molecules remain as sugar and water
    • All pure substances can be separated into two categories by asking the question "Can the sample be further decomposed by chemical means?"
      • YES - Compound
      • NO - Element
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  • Sample Questions
    • How does mold form and how can you stop it?
    • How and why does rust form?
    • Why won’t oil and water mix?
    • http://www.youtube.com/watch?v=hfb5bA_A6zE
    • http://www.haverford.edu/educ/knight-booklet/mustitrust.htm