CHEM10003 Lecture Notes - Lecture 16: State Function, Closed System, Vacuum Flask
27 Nov 2018
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Document Summary
However, a big activation barrier needs to be overcome. For endothermic reactions an initial energy source is required to initiate the reaction. Thermochemistry energy changes in chemical reactions: static molecules possess potential energy as bonds, moving molecule possess kinetic energy, total energy = pe + ke. Chemical reactions: energy change due to bond formation/breakage (whenever a bond is broken, energy was required. Law of conservation of energy: energy can be converted form one form to another, but it cannot be created or destroyed. The total energy of the universe is constant. Open system: matter can be transferred through the opening of the flask, heat can be conducted through the flask walls. Closed system: the flask is stoppered so no matter can be transferred, heat can be conducted through the flask walls. Isolated system: heat transfer is prevented by the vacuum flask, matter cannot be transferred.
