Investigation 36 discussion

Investigation 36 discussion - of catalysts is in terms of...

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Because I couldn’t copy any one’s chem notebook, I don’t know the results of each reagent. So if someone can put them into the discussion, I’d appreciate it! Thanks (for example: The addition of Fe(NO 3 ) 3 caused the equilibrium to shift to the right forming more product, FeNCS 2+ , evident by a darker red color. This occurred because the addition of more Fe(NO 3 ) 3 caused excess NCS - in solution to react with the added Fe 3+ . This formed more of the product, FeNCS 2+ , which was responsible for the darker red color.) Discussion: LeChâtelier's Principle, which states that any change made to a system at equilibrium will cause a shift in equilibrium that tends to counteract that change. Each of the factors examined in this experiment affects the rate of reaction. One additional factor has been omitted: catalysts. Catalysts speed up the rate of reactions by lowering the activation energy requirement. But this happens for both the forward and reverse reactions so there is no net effect. Another way to think about the behavior
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Unformatted text preview: of catalysts is in terms of the free energy change. The balanced equation for a reaction is the same with or without the catalyst. Therefore the free energy change is the same with or without the catalyst. That means the extent of spontaneity has not changed. In summary: If additional reactant is added the equilibrium shifts to the right. If additional product is added the equilibrium shifts to the left. If reactant is removed the equilibrium shifts to the left. If product is removed the equilibrium shifts to the right. If heat is added the equilibrium shifts in the direction of the endothermic process. If heat is removed the equilibrium shifts in the direction of the exothermic process. If gas pressure is increased the equilibrium shifts to the side with fewer gas moles. If gas pressure is decreased the equilibrium shifts to the side with more gas moles....
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