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And yet these quantities are often represented as being dimensionless. Which is correct? The answer is that both forms are acceptable. In carrying out your own calculations, however, there is rarely any real need to show the units. The subject of standard states would take us beyond where we need to be at this point in the course, so we will simply say that the concept is made necessary by the fact that energy, which ultimately governs chemical change, is always relative to some arbitrarily defined zero value which, for chemical substances, is the standard state.
Mike Blaber Florida State University. Chem1 Virtual Textbook. Learning Objectives How to figure out in which direction a reaction will go i. The Equilibrium Constant Equilibrium reactions are those that do not go to completion, but are in a state where the reactants are reacting to yield products and the products are reacting to produce reactants.
There are some rules about writing equilibrium constant expressions that need to be learned: Concentrations of products are multiplied on the top of the expression. Concentrations of reactants are multiplied together on the bottom. Coefficients in the equation become exponents in the equilibrium constant expression. Solids, liquids, and solvents are assigned a value of 1, so their concentrations do not affect the value of K. Equilibrium Constant Expressions The equilibrium constant value is the ratio of the concentrations of the products over the reactants.
If K eq is very large , the concentration of the products is much greater than the concentration of the reactants. The reaction essentially "goes to completion"; all, or most of, the reactants are used up to form the products.
If K eq is very small , the concentration of the reactants is much greater than the concentration of the products. The reaction does not occur to any great extent—most of the reactants remain unchanged, and there are few products produced.
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