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Properties Of Matter

Properties Of Matter



Based on first section of Properties of Matter chapter in McDougal Littell 8th grade science series

Based on first section of Properties of Matter chapter in McDougal Littell 8th grade science series



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    Properties Of Matter Properties Of Matter Presentation Transcript

    • 2.1 Observable Properties of Matter Ms. Wells, Science
    • Property Types
      • Physical : properties that can be observed without changing the IDENTITY of the matter
      • Chemical: property of a substance that changes it into a NEW substance (changes the identity of the substance)
    • Examples of Physical Properties
      • Volume, mass, color, texture, shape and density
      • Great example:
        • Stretching a rubber band may change its color and shape, but its still made of rubber and is still a rubber band!
    • More about Density
      • Density = amount of matter (mass) in a certain amount of space (volume)
      • Density is constant (does not change for one substance)
      • Different substances = different densities
    • U.S. Population Density
    • Calculating Density (D)
      • Formula: D = m / V
        • Mass (m) = kilograms (kg) or grams (g)
        • Volume (V) = cubic centimeters (cm 3 )
      • Sooo…. Units for density are g/ cm 3
        • Said “ grams per cubic centimeters ”
    • The Clay Example: Density = Constant
      • You have a 200g piece of clay with volume of 100 cm 3
        • V = 200g/100 cm 3
        • V = 2 g/cm 3
      • If you break it in half, you have 2 pieces of clay that are 100g and 50 cm 3 each
        • V = 100g/50cm 3
        • V = 2 g/cm 3
        • SAME DENSITY!
    • Examples of Chemical Properties and Changes
      • Describe how substances form into new substances
      • Examples: rusting, combustibility (burning), tarnishing, sometimes cooking, etc.
      • Chemical REACTIONS = Chemical Changes
    • Physical Changes
      • Any change that does not change the actual substance itself
      • Changes in states of matter are physical (melting ice, etc.)
      • Other examples:
        • Breaking an object
        • Wool on a sheep
        • or a wool sweater
        • is still wool
    • Signs of a Chemical Change
        • Odor – new smell (rotting meat, burning smell)
        • Temperature change – log goes from wood to ash, feel the heat!
        • Color change – not always chemical, but often
        • New solids from liquids (called precipitates ) – clams make shells by mixing seawater substances and substances in their bodies
    • Pictures of Chemical Changes
      • Precipitates forming (new solids from different liquid substances)
    • Pictures of Chemical Changes
      • Water and salt of
      • sweat reacts with oils
      • and substances on
      • your skin = body odor
    • THE END OF 2.1 Properties of Matter in Matter and Energy