Exothermic and endothermic_reactions

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Exothermic and endothermic_reactions

  1. 1. Exothermic and Endothermic Reactions © Teachable . Some rights reserved. http://teachable.net/res.asp?r=1910 By, Abhinav.B
  2. 2. Endothermic and exothermic reactions Step 1: Energy must be SUPPLIED to break chemical bonds: Step 2: Energy is RELEASED when new chemical bonds are made: A reaction is EXOTHERMIC if more energy is RELEASED than SUPPLIED. If more energy is SUPPLIED than is RELEASED then the reaction is ENDOTHERMIC © Teachable . Some rights reserved. http://teachable.net/res.asp?r=1910
  3. 3. Energy level diagrams Energy level Reaction progress Activation energy Energy given out by reactionUsing a catalyst might lower the activation energy © Teachable . Some rights reserved. http://teachable.net/res.asp?r=1910
  4. 4. Endothermic process: a change (e.g. a chemical reaction) that requires (or absorbs) heat. Photosynthesis is an endothermic reaction (requires energy input from sun) Forming Na+ and Cl- ions from NaCl is an endothermic process
  5. 5. Measuring HeatMeasuring Heat reaction EndothermicEndothermic reaction, heatreaction, heat taken in &taken in & temperature oftemperature of the substancethe substance dropsdrops
  6. 6. Ammonium nitrate + water
  7. 7. Starting temperature 20 C⁰
  8. 8. Add ammonium nitrate to water
  9. 9. a temperature decrease of 8 C⁰
  10. 10. EXOTHERMIC & ENDOTHERMIC REACTIONSEXOTHERMIC & ENDOTHERMIC REACTIONS Exothermic process: a change (e.g. a chemical reaction) that releases heat. Burning fossil fuels is an exothermic reaction
  11. 11. Heat Released ExothermicExothermic reaction, heatreaction, heat given off &given off & temperature oftemperature of substancesubstance rises.rises. reaction
  12. 12. Exothermic vs endothermic: EXOTHERMIC – more energy is given out than is taken in (e.g. burning, respiration) ENDOTHERMIC – energy is taken in but not necessarily given out (e.g. photosynthesis) © Teachable . Some rights reserved. http://teachable.net/res.asp?r=1910
  13. 13. Examples Exothermic • Combustion of fuels • Yeast & Hydrogen Peroxide • Epson salts & water Endothermic • Photosynthesis • Acedic Acid & Sodium Bicarbonate © Teachable . Some rights reserved. http://teachable.net/res.asp?r=1910

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