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Science 9 Unit 2. Topic 2: Changes in Matter. Properties are the characteristic ways in which a substance behaves Properties can CHANGE Scientist classify changes in matter into 2 categories Physical and chemical changes. Physical Change.

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science 9 unit 2

Science 9 Unit 2

Topic 2: Changes in Matter

slide2

Properties are the characteristic ways in which a substance behaves

  • Properties can CHANGE
  • Scientist classify changes in matter into 2 categories
    • Physical and chemical changes
physical change
Physical Change
  • A substance changes in form but not in chemical composition
  • No new substances are formed
  • New properties are temporary because a change in state can be reversed
  • http://app.discoveryeducation.ca/search?Ntt=physical+changes
chemical change
Chemical Change
  • Causes one or more new substances to be formed
  • Can be difficult or impossible to reverse
  • http://app.discoveryeducation.ca/search?Ntt=physical+changes
can you ever be sure about changes
Can You Ever be sure about Changes?
  • If you make 2 or more of the following observations, then a chemical change has probably taken place
    • Heat is produced or absorbed
    • The starting material is used up
    • There is a change in colour
    • A material with new properties forms
    • Gas bubbles form in a liquid
    • A precipitate forms in a liquid
    • The change is difficult to reverse
    • http://app.discoveryeducation.ca/search?Ntt=physical+changes
properties chemical or physical
Properties: Chemical or Physical?
  • Any property that can be observed or measured without forming a new substance is a physical property
    • Ex. Density
      • The amount of matter that occupies a certain space
  • Any property that describes how a substance reacts with another substance when forming a new substance is a chemical property
    • Combustibility
      • The ability of a substance to burn in oxygen
properties chemical or physical1
Properties: Chemical or Physical?
  • Physical properties are often further classified as either qualitative or quantitative
    • Qualitative
      • Characteristic of a substance that can be described but might not be measured (a quality)
      • Ex.
        • Colour
        • Texture
        • Malleability
        • Taste
        • Smell
        • Ductility
        • State
        • Crystal shape
properties chemical or physical2
Properties: Chemical or Physical?
  • Quantitative
    • Characteristic of a substance that can be measured numerically (a quantity)
      • Ex.
        • Melting/boiling temperature
        • Density
        • Viscosity
        • Solubility
        • Electrical conductivity
        • Heat conductivity