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17 Cards in this Set
- Front
- Back
The equalibrium constant allows us to predict what 2 things
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1. the direction in which a reaction mixture will proceede 2. calculate the concentrations of rcts and prods when equal. is reached
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What is the reaction quotient?
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the resulut of substituting product concent or PP into an Keq expression (Q)
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What does it mean when 1. Q>Keq and 2. Q<Keq?
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1.The reaction achieves equal. by forming more reactants 2. Visa versa
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When does the reaction quot. equal the Keq?
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at equalibrium
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What is LeChatelier's principle?
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If a system at equal. is disturbed by a change in T, P, or Concentration of one of the components, the system will shift its equal. position to counteract the effect
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What are three ways a chem equal can be disturbed?
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adding a rct or prod, changing the P, changing the T
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A system at equal. is in what kind of state?
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Dynamic: the forward and reverse proccess are occuring at equal rates
system is balanced |
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How can a system reduce its pressure to return balance (return to equal)?
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reduce the total nimber of gas molecules
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What occurs by reducing the volume of a gaseous equalibrium mixture?
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causes the system to shift in the direction that reduces the number of moles of gas. (conversly increasing volume causes increase gas molecules)
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What effect do pressure-volume changes have on the value of Keg?
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The do not have any effect as ling as the T remains constant
They DO change the PP of gaseous substances |
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Changes in the Concentrations or PP Cause what?
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A shift in the equalibrium without changing the value of the Keq
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How can the total Pressure of a rxn be changed without changing the volume?
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Adding a gas that is not involved with the equalibrium.
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When temp is increased in a endothermic what happens to the equalibrium
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the equalibrium shifts to the right in the direction of the products, Keq increases.
(Heating an exothermic causes a shift to left) |
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Cooling a Endothermic reaction has what effect on the equal.?
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shift to the left, decreasing Keq
(cooling an exothermic causes a shift to the right) |
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What does a catalyst do?
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Lowers the activation barrier betwwen reactants and products. (activation e is lowered in both forward and backward reactions, increases both reaction rates)
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Overall, what does a catalyst do?
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increases the rate of which equalib. is achived. Does not change the composition of the equal mixture
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How are Catalysts important economically
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make it possible to more repidly obtain equal at lower T
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