Everything Chem

5 catalysis a catalyst is a substance that increases

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Unformatted text preview: hermodynamics Energy can neither be created or destroyed The first law of thermodynamics states: that E can be changed by adding heat q, or by doing work w on the system ***Note that ΔE (like ΔH ) is a state function (i.e. its value is path- independent) Important: q and w are not state functions. What does this mean? Consider the Reaction The total amount of energy released during this process (ΔE) is always the same. The negative sign expresses the fact that a system loses energy when the volume increases. ***Therefore Now consider a reaction taking place at a constant volume, in this case It becomes Enthalpy (H): At constant pressure we can say that any change in enthalpy is: ***Therefore (at a constant pressure) MOST chemical reactions are carried out at a constant pressure Chapter 5.1 Reaction Rate Reaction Rate:...
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