Sunday, 9 July 2017

3.5C: Draw and Explain Energy Level Diagrams to Represent Exothermic and Endothermic Reactions



EXOTHERMIC
ENDOTHERMIC

Diagram showing the Enthalpy Change during an Exothermic Reaction

Diagram showing the Enthalpy Change during an Endothermic Reaction
DEFINITION:
Reaction in which energy is given out to surroundings, decreasing energy level (temperature increases)

DEFINITION:
Reaction in which energy is taken in from surroundings, increasing energy level (temperature decreases)

EXPLANATION:

  • During an exothermic reaction, energy is given out to surroundings
  • Therefore, the energy of products will be lower than the energy of reactants, having -△H (this is represented in energy-level diagram above)

EXPLANATION:

  • During an endothermic reaction, energy is taken in from surroundings
  • Therefore, the energy of products will be higher than the energy of reactants, having +△H (this is represented in energy-level diagram above)
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1.2: Understand the Interconversions between the Three States of Matter in Terms of: The Names of the Interconversions, How they are Achieved, the Changes in Arrangement, Movement and Energy of the Particles

INTERCONVERSIONS BETWEEN STATES OF MATTER: Diagram showing the interconversions between the states of matter EXPLANATION: CHANGE EXPLANATION...