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Pure Substances and Mixtures
N/A
6
Science
7th Grade
10/17/2011

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Term
Pure Substance
Definition
  • Any form of matter that has
    • a definite composition
    • a specific set of identifying properties
    • can not be seperated by physical means
    • constant chemical composition
  • Examples:
    • Elements
    • Compounds
Term
Elements
Definition
  • Substances which cannot be brocken down into smaller substances
  • composed of one type of atom
  • Example-
    • Gold (Au)
    • Aluminum (Al)
    • Carbon (C)
    • Helium (He)
    • Oxygen(O)
    • Periodic table has all the elements (117) 
Term
Compounds
Definition
  • Substances made of two or more elements chemically combined
  • Have different properties than the elements they are made of
  • Cannot be seperated easily
Term
Mixture
Definition
  • A compbination of two or more substances that are not chemically combined
  • Individual substances in the mixture keep their own properties
  • The different substances can be seperated easily into the original compounds
Term
Homogeneous
Definition
  • The component substances cannot be visibly identified
  • The substance is "the same throughout"
  • Also called a solution
  • Examples:
    • Milk
    • Mayonaise
    • Air
    • Soda
Term
Heterogeneous
Definition
  • The componetnt substances can be easily identified
  • The substance is not the same throughout
  • Examples:
    • Pepperoni and mushroom pizza
    • Vegetable soup
    • A toy box full of toys
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