introduction to chemical reactions physical and chemical changes
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Introduction to Chemical Reactions: physical and chemical changes

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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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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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