10' Chemical Reactions and Reaction Rate

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10. Chemical Reactions and Reaction Rate
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Chemical Reaction

• Chemical Reactions can be divided into four
  types
• Composition
• Decomposition
• Single replacement
• Double Replacement

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Composition

• Two or more substances come together to form a
  new substance
• A B AB
• Iron Oxygen Iron oxide

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Decomposition

• One Compound breaks down into simpler substances.
• AB A B
• Water Hydrogen Oxygen

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Single Replacement

• One substance replaces another.
• A BX AX B
• Iron copper sulfate
• iron sulfate
  copper

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Double Replacement

• Substances change partners.
• AB XY AY BX
• Iron Chloride potassium sulfide
• Potassium chloride iron sulfide

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• Chemical reactions take place at different
  speeds.
• Rust happens slow
• Wood burns quickly
• The speed at which a chemical reaction takes
  place is the reaction rate

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• The temperature , pressure, concentration and
  presence or absence of a catalyst all affect the
  reaction rate.