CHEM1001 Lecture Notes - Lecture 10: Intensive And Extensive Properties, Chemical Stability, Combustibility And Flammability

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1 Aug 2016
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Lecture 10
All properties of matter are either extensive or intensive and either physical or chemical.
Extensive properties, such as mass and volume, depend on the amount of matter that is being
measured.
Intensive properties, such as density and color, do not depend on the amount of matter.
Both extensive and intensive properties are physical properties, which means they can be
measured without changing the substance's chemical identity.
The freezing point of a substance is a physical property: when water freezes, it's still water-it's
just in a different physical state.
Water can exist in several states, including ice, water, and water vapor.
A chemical property is any of a material's properties that becomes evident during a chemical
reaction; that is, any quality that can be established only by changing a substance's chemical
identity.
Chemical properties cannot be determined just by viewing or touching the substance; the
substance's internal structure must be affected for its chemical properties to be investigated.
Physical properties are properties that can be measured or observed without changing the
chemical nature of the substance.
Color density volume mass boiling point: the temperature at which a substance boils melting
point: the temperature at which a substance melts Physical properties.
Matter has mass and volume, as demonstrated by this concrete block.
You can observe its mass by feeling how heavy it is when you try to pick it up; you can observe
its volume by looking at it and noticing its size.
Mass and volume are both examples of extensive physical properties.
Remember, the definition of a chemical property is that measuring that property must lead to a
change in the substance's chemical structure.
Heat of combustion is the energy released when a compound undergoes complete combustion
with oxygen.
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