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Types of chemical reactions

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  • 1. Do Now: Balance this reaction: Al 2 (SO 4 ) + Ca(OH) 2 Al(OH) 3 + CaSO 4
  • 2. Types of Chemical Reactions
  • 3. Goals:
    • To discover how to classify chemical reactions.
    • To learn what factors can change reactions.
  • 4. Classifying Reactions Many chemical reactions can be classified in one of three categories: synthesis, decomposition, or replacement.
  • 5. Exothermic and Endothermic Reactions
    • Exothermic Reaction : energy is stored in the reactants and released as part of the products as heat or light (fireworks). The energy term appears on the right side of the equation
    • Endothermic Reactions : energy is used in the reaction and absorbed in the products. The energy term appears on the left side of the equation.
  • 6. Practice
    • Is the photosynthesis reaction exo- or endothermic?
    C 6 H 12 O 6 + 6O 2 + Energy 6CO 2 + 6H 2 O Light WHY?
  • 7. Rates of Reactions
    • The reaction rate is the rate at which reactants turn into products. They are affected by:
    • Temperature : Generally, increasing the temperature will speed up a reaction.
    • Surface area : increasing the area of the reactants will increase a reaction.
  • 8. Reaction Rates
    • Stirring : stirring increases the collisions among particles and speeds up a reaction.
    • Concentration : increasing the number of particles of the reactants will increase the speed of the reaction.
    • Catalysts : substances that speed up a reaction but are not used in the reaction. In photosynthesis. Light is a catalyst. Catalysts are written above the arrows in a reaction.

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