Science 9 unit 2
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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

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Science 9 unit 2

Science 9 Unit 2

Topic 2: Changes in Matter


Science 9 unit 2

  • 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


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