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Chapter 6, Section 3 Pages 234-239.

Chapter 6, Section 3 Pages 234-239. Controlling Chemical Reactions. Activation Energy- Draw !. The minimum amount of energy needed to start a chemical reaction. All chemical reactions require a certain amount of activation energy to get started. Figure 12, page 235.

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Chapter 6, Section 3 Pages 234-239.

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  1. Chapter 6, Section 3Pages 234-239. Controlling Chemical Reactions

  2. Activation Energy-Draw! • The minimum amount of energy needed to start a chemical reaction. • All chemical reactions require a certain amount of activation energy to get started. • Figure 12, page 235.

  3. Rates of Chemical Reactions • Chemical reactions do not occur all at the same rate. Some are very fast, while others are slow. • Factors that affect rates of reaction include surface area, temperature, concentration, and the presence of catalysts or inhibitors. • Figures 13 & 14, pg.’s 236-237.

  4. Concentration • The amount of a substance in a given volume. (Fig. 15, pg. 238) • Adding a spoonful of sugar to lemonade will make it sweet, but adding a larger spoonful of sugar to the lemonade will make it even sweeter. The glass with more sugar has a greater concentration of sugar molecules.

  5. Catalyst • A material that increases the rate of a reaction by lowering the activation energy. • Figure 16, pg. 239.

  6. Enzymes- Draw!!! • Biological catalysts that are very specific. (Fig. 16, pg. 239) • Your body contains thousands of different enzymes, each of which only affect one chemical reaction.

  7. Inhibitor Draw!!! • A material that prevents reactants from coming together. • Preservatives in food are inhibitors used to prevent the food from spoiling.

  8. Questions???

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