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Dubai

Topic 5 IGCSE Chemical Energetics

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Published in: Chemistry
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Here we will discuss about the exothermic , endothermic , reaction activation energy .

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  1. TOPIC ENERGE ,AQA ARN CHEMISTRY WITH BABAR CHEMICAL IS FOR CAMBRIDAGE CEL, OXFORD
  2. WG4AT uS The exchange of energy is fundamental to all chemical changes. As the exchange of energy occurs, so does the transformation in matter, and the study of these changes forms the core of chemical energetics. The roles of systems, surroundings, the flow of heat, and the laws that govern these factors are observable in complex and straightforward chemical phenomena.
  3. REACTAON An exothermic reaction is a reaction in which energy is released in the form of light or heat Thus in an exothermic reaction, energy is transferred into the surroundings rather than taking energy from the surroundings as in an reaction @ In an exothermic reaction, the change in enthalpy ( AH) will be negative.
  4. REACTAONS Making of an Ice Cube. Making an ice cube is a process of liquid changing its state to solid. Snow Formation in Clouds Burning of a Candle Rusting of Iron Burning of Sugar Formation of Ion Pairs Reaction of Strong Acid and Water Water and Calcium Chloride.
  5. HEAT EXOTHERMIC 4 Surroundings HEAT Temperature of the surrounding will increase Heat energy released combustion , neutralization Corrison of iron etc
  6. 4Fe + 302 -+ 2Fe203 AHD = - 1648 kJ/mol. A o in the above equation ; the value is negative which indicates about the release of energy . CH4 + 202 C02 + 21-120 AHD = - 890 kJ/mol this reaction is also same exothermic because energy is released in thereaction
  7. REACTAON ENERGY EXOTHERMIC REACTION Reactants Heat is released A H is negative Products Reaction Pathway
  8. Endothermic and exothermic reactions absorption or release ofheat. absorb energy Endothermic rextion is tooler ffan the surrounirgS WHAT ENDOTHERMIC REACTION Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products. For example melting of ice
  9. 2. 3. 4. 5. 6. 7. photosynthesis, evaporating liquids, melting ice, dry ice, alkane cracking, thermal decomposition ammonium chloride in These are the example whare energy is required heat for the completion of reaction
  10. QUATAONS OF REACTAON 6 +6 —CH O +6 02 6 12 6 this is photosynthsis reaction whare suger is made for plants and energy Endothermic o Surroundings get cooler o is required Exothermic AH<O Surroundings get warmer
  11. PATHWAY Endotherrnic Energy Diagrarn
  12. ACTAVATAON Activation energy is defined as the minimum amount of extra energy required by a reacting molecule to get converted into a product. A c t i v ati o E n e r g y a it i o r. state

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