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Enthalpy Changes P18
- Delta H (energy change) = the heat energy
transferred in a reaction at constant pressure
- Standard Questions= 100kpa pressure and 25'c
- Exothermic=energy given out
- Delta H =Negative
- E.g. Oxidation Reactions
- E.g. Combustion
- E.g. Combustion
- Delta H =Negative
- Endothermic=energy taken in
- Delta H=Positive
- E.g. Thermal Decomposition
- E.g. Photosynthesis
- Delta H=Positive
- Enthalpy Profile Diagrams
- The LESS ENTHALPY a substance has, the
MORE STABLE it is
- The LESS ENTHALPY a substance has, the
MORE STABLE it is
- Activation Energy, Ae = the minimum
energy needed for a reaction to occur
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