Physical vs. Chemical Properties
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Physical vs. Chemical Properties

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Physical vs. Chemical Properties Presentation Transcript

  • 1. Physical versus Chemical Properties The study of matter
  • 2.
    • Matter: anything that has mass and takes up space
      • Mass – the amount of matter in something
      • Volume – the amount of space something occupies
    • Which of the following is matter?
      • A car?
      • A box?
      • You?
    Reviewing MATTER
  • 3. What is a property?
    • Property : a characteristic of a substance that can be observed
  • 4. Physical Property Physical property: a property that can be observed without changing the identity of the substance.
    • Examples:
      • luster
      • malleability: the ability to be hammered into a thin sheet
      • ductility: the ability to be stretched into a wire
    • melting point
    • boiling point
    • density
    • solubility
    • specific heat
  • 5. Special Physical Properties
    • Melting point : the temperature at which a substance changes from a solid to a liquid at a given pressure
          • water = 0 o C
    • Boiling point : the temperature at which a substance changes from a liquid to a gas at a given pressure
    • water = 100 o C
  • 6. Chemical Properties
    • Chemical property : a property that can only be observed by changing the identity of the substance
    • Examples:
        • flammability
        • ability to rust
        • reactivity with vinegar
  • 7. Density
    • Density is the amount of mass per unit of volume.
    • Density can be used to identify a substance.
    • The density of water is 1.0g/mL
  • 8. Density Calculations
    • Calculations:
        • D = m/V = g/mL = g/cm 3
    • Ex: A cube has a mass of 2.8 g and occupies a volume of 3.67 ml. Would this object float or sink in water?
          • Mass = 2.8 g Volume = 3.67 mL
          • D = 2.8g/3.67 mL= 0.76 g/mL
      • This object would float in water because its density is less than water (1.0 g/mL).
  • 9. More Density Calculations
    • Ex: A liquid has a mass of 25.6 g and a volume of 31.6 mL. Use the table below to identify the substance.
    M=25.6 g V=31.6 mL D = 25.6 g/31.6 mL D= 0.81 g/mL The substance is ethanol.