HEAT CHANGES IN CHEMICAL REACTIONS<br />
The chemical reaction that results in heat produced is called an exothermic reaction.<br />Example- Dissolving sodium hydr...
Exothermic reaction accompanied by a rise in temperature of the surrounding.<br />
The chemical reaction that absorbs heat from the surrounding is called an endothermic reaction.<br />Example- Dissolving a...
Endothermic reaction resulting a drop of the temperature of the surrounding.<br />
Energy graph for an exothermic reaction<br />
Energy graph for an endothermic reaction.<br />
The change of energy level in a chemical reaction is denoted by the symbol  <br />
When the energy level of the product is higher than that of reactants , energy is absorbed.<br />The reaction is endotherm...
When the energy level of the product is lower than the reactants, energy is released.<br />The reaction is exothermic     ...
HEAT CHANGES IN INDUSTRIAL CHEMICAL REACTION<br />If a reaction is exothermic and reversible, heating the process to a ver...
HABER PROCESS<br />Production of ammonia<br />Nitrogen + Hydrogen     Ammonia +  Heat<br />Heat is given off. So a low tem...
CONTACT PROCESS<br />Production of sulphuric acid.<br />Sulphur dioxide + Oxygen      Sulphurtrioxide    + Heat<br />Heat ...
The sulphur trioxide is passed into concentrated sulphuric acid to form oleum.<br />Sulphur trioxide + Con. Sulphuric acid...
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Heat Changes in Chemical Reactions

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Heat Changes in Chemical Reactions

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Heat Changes in Chemical Reactions

  1. 1. HEAT CHANGES IN CHEMICAL REACTIONS<br />
  2. 2. The chemical reaction that results in heat produced is called an exothermic reaction.<br />Example- Dissolving sodium hydroxide in water.<br />
  3. 3. Exothermic reaction accompanied by a rise in temperature of the surrounding.<br />
  4. 4. The chemical reaction that absorbs heat from the surrounding is called an endothermic reaction.<br />Example- Dissolving ammonium chloride in water.<br />
  5. 5. Endothermic reaction resulting a drop of the temperature of the surrounding.<br />
  6. 6. Energy graph for an exothermic reaction<br />
  7. 7. Energy graph for an endothermic reaction.<br />
  8. 8. The change of energy level in a chemical reaction is denoted by the symbol <br />
  9. 9. When the energy level of the product is higher than that of reactants , energy is absorbed.<br />The reaction is endothermic and is (+) ve.<br />
  10. 10. When the energy level of the product is lower than the reactants, energy is released.<br />The reaction is exothermic and is (-) ve.<br />
  11. 11. HEAT CHANGES IN INDUSTRIAL CHEMICAL REACTION<br />If a reaction is exothermic and reversible, heating the process to a very high temperature would decrease the yield of the products.<br />Example- Production of ammonia<br />
  12. 12. HABER PROCESS<br />Production of ammonia<br />Nitrogen + Hydrogen Ammonia + Heat<br />Heat is given off. So a low temperature will give better yield.<br />But a low temperature will cause the reaction to proceed slowly.<br />A moderate temperature of 450-500 is used.<br />
  13. 13. CONTACT PROCESS<br />Production of sulphuric acid.<br />Sulphur dioxide + Oxygen Sulphurtrioxide + Heat<br />Heat is given off. So a low temperature will give better yield.<br />But a low temperature will cause the reaction to proceed slowly.<br />A moderate temperature of 400-500 is normally used.<br />
  14. 14. The sulphur trioxide is passed into concentrated sulphuric acid to form oleum.<br />Sulphur trioxide + Con. Sulphuric acid Oleum<br />Oleum + Water Sulphuric acid<br />

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