Chemistry - Yr 11 - Quantitative Chemistry

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  • Created by: Ollie710
  • Created on: 26-11-16 12:58

Energitics

Heat change in a chemical reaction

  • Heat change or empathy change is the amount of energy involved in a reaction
  • /\ H - (/\ is for change, H means energy content)
  • Unit - KiloJules

Endothermic Reaction

  • This reaction gains energy from its surroundings, the /\H is positive
  • This causes its surroundings and the reaction mixture to get colder
  • An example of an endothermic reaction is Thermal Decompostion
  • Bond breaking is endothermic
  • In an energy diagram for an endothermic reaction, the reactans are lower at the start of the graph than the products at the end of the Graph

Exothermic Reaction

  • This reaction loses energy from its surroundings, the /\H is negative
  • This causes the reaction mixture and its surroundings to get hotter
  • An example of this is burning or a neuteralisation reaction between acids and Alkalis
  • Bond forming is exothermic
  • In an energy diagram of an Exothermic reaction, the reactants is higher at the start of the graph than the products at the end of the graph.

Reversible Reactions

Conditions that effect the position of equilibrium: - Temperature                                                              

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