Introduction to chemical reactions physical and chemical changes
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Introduction to Chemical Reactions: physical and chemical changes PowerPoint PPT Presentation


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Introduction to Chemical Reactions: physical and chemical changes. CLASS NOTES. Elements and Compounds. An element is a substance that contains only ____ kind of atom Compound is a pure substance that is made of up ______ or more elements Elements and compounds are created through bonding

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Introduction to Chemical Reactions: physical and chemical changes

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Introduction to chemical reactions physical and chemical changes

Introduction to Chemical Reactions: physical and chemical changes

CLASS NOTES


Elements and compounds

Elements and Compounds

  • An element is a substance that contains only ____ kind of atom

  • Compound is a pure substance that is made of up ______ or more elements

  • Elements and compounds are created through bonding

    • What are the two different types of bonding?


Chemical reactions produce changes

Chemical reactions produce changes…

  • TWO types of changes: physical and chemical

  • Physical change:

    • Change in state: solid, liquid or gas

    • May change in colour

  • Chemical change: forms a new substance

    • Heat may be produced

      For example: newspaper

      physical change: can make a ball of newspaper

      chemical change: sun’s energy can turn the paper yellow is you leave it in the sun


Physical or chemical change

Physical or Chemical Change?

  • Butter melting

  • Digestion of foods in your body

  • Bubbles of gas escaping from a soda

  • Rust on a car

  • Lake freezing (turning to ice from water)


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