Do Now: Balance this reaction: Al 2 (SO 4 )  +  Ca(OH) 2   Al(OH) 3   +  CaSO 4
Types of Chemical Reactions
Goals: <ul><li>To discover how to classify chemical reactions. </li></ul><ul><li>To learn what factors can change reaction...
Classifying Reactions Many chemical reactions can be classified in one of three categories: synthesis, decomposition, or r...
Exothermic and Endothermic Reactions <ul><li>Exothermic Reaction : energy is stored in the reactants and released as part ...
Practice <ul><li>Is the photosynthesis reaction exo- or endothermic? </li></ul>C 6 H 12 O 6  + 6O 2  + Energy 6CO 2  + 6H ...
Rates of Reactions <ul><li>The reaction rate is the rate at which reactants turn into products. They are affected by: </li...
Reaction Rates <ul><li>Stirring : stirring increases the collisions among particles and speeds up a reaction. </li></ul><u...
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Types of chemical reactions

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Types of chemical reactions

  1. 1. Do Now: Balance this reaction: Al 2 (SO 4 ) + Ca(OH) 2 Al(OH) 3 + CaSO 4
  2. 2. Types of Chemical Reactions
  3. 3. Goals: <ul><li>To discover how to classify chemical reactions. </li></ul><ul><li>To learn what factors can change reactions. </li></ul>
  4. 4. Classifying Reactions Many chemical reactions can be classified in one of three categories: synthesis, decomposition, or replacement.
  5. 5. Exothermic and Endothermic Reactions <ul><li>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 </li></ul><ul><li>Endothermic Reactions : energy is used in the reaction and absorbed in the products. The energy term appears on the left side of the equation. </li></ul>
  6. 6. Practice <ul><li>Is the photosynthesis reaction exo- or endothermic? </li></ul>C 6 H 12 O 6 + 6O 2 + Energy 6CO 2 + 6H 2 O Light WHY?
  7. 7. Rates of Reactions <ul><li>The reaction rate is the rate at which reactants turn into products. They are affected by: </li></ul><ul><li>Temperature : Generally, increasing the temperature will speed up a reaction. </li></ul><ul><li>Surface area : increasing the area of the reactants will increase a reaction. </li></ul>
  8. 8. Reaction Rates <ul><li>Stirring : stirring increases the collisions among particles and speeds up a reaction. </li></ul><ul><li>Concentration : increasing the number of particles of the reactants will increase the speed of the reaction. </li></ul><ul><li>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. </li></ul>
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