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JeopardyJeopardy
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EquilibriumEquilibriumConstants
Le Chatelier’sPrinciple
ReactionQuotients
Miscellaneous
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Final JeopardyFinal Jeopardy
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Chemical Equilibrium is defined as..Chemical Equilibrium is defined as..
When the rate of the forward reaction When the rate of the forward reaction equals the rate of the reverse reactionequals the rate of the reverse reaction
1 - $2001 - $200
Collision theory states that as reaction not Collision theory states that as reaction not at equilibrium, has its forward reaction at equilibrium, has its forward reaction increase, its reversible reaction will increase, its reversible reaction will ________.________.
Decrease. Because less molecules means Decrease. Because less molecules means it will collide less often, with the correct it will collide less often, with the correct requirements.requirements.
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True or false, the time it takes for systems to True or false, the time it takes for systems to reach equilibrium are always the same.reach equilibrium are always the same.
False. The time it takes for reactions to False. The time it takes for reactions to reach equilibrium all vary. Some reach it reach equilibrium all vary. Some reach it very slowly or very quickly. But never very slowly or very quickly. But never instantaneous. instantaneous.
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Collision Theory states for a reaction to Collision Theory states for a reaction to occur the molecule must…occur the molecule must…
1) Collide1) Collide2) Collide with enough minimum energy2) Collide with enough minimum energy2) Collide with the correct orientation2) Collide with the correct orientation
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Dynamic equilibrium is…Dynamic equilibrium is…
When the forward and reverse reactions When the forward and reverse reactions are at equal rates, but are continuing to are at equal rates, but are continuing to occur. They continue to react, but the occur. They continue to react, but the overall ratio stays the same.overall ratio stays the same.
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The form of concentration in which The form of concentration in which equilibrium expressions are written in is..equilibrium expressions are written in is..
Molarity (mol/liter) Molarity (mol/liter)
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What is the KWhat is the Keqeq for the reaction of for the reaction of
NN2(g) 2(g) + O+ O2(g) 2(g) 2NO 2NO (g) (g)
If the concentrations of NIf the concentrations of N22, O, O22, and NO are , and NO are respectively 0.48M, .075M, and 0.030Mrespectively 0.48M, .075M, and 0.030M
KKeq eq = 0.0025 (no units)= 0.0025 (no units)
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Write the equilibrium expression for the Write the equilibrium expression for the following reversible reaction:following reversible reaction:FeFe22OO3(s) 3(s) +H+H2(g) 2(g) 2Fe 2Fe(s) (s) +3H+3H22OO(g)(g)
KKeqeq = [H = [H22O]O]33 / [H / [H22]]33
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True or False: Temperature does not affect True or False: Temperature does not affect the equilibrium expression.the equilibrium expression.
False. Temperature affects the rate of False. Temperature affects the rate of either forward or reverse reaction so that either forward or reverse reaction so that it changes the numerical value of the it changes the numerical value of the expression.expression.
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What are the units on the equilibrium What are the units on the equilibrium expression constant for expression constant for
KKeqeq = [NO] = [NO]22 / [N / [N22][O][O22]]
No units. (MNo units. (M22 / M x M ) = no units / M x M ) = no units
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Describe Le Chatelier’s Principle.Describe Le Chatelier’s Principle.
When stress is put on a system, the When stress is put on a system, the system will shift to reach equilibrium system will shift to reach equilibrium again.again.
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What does it mean when a reaction “is What does it mean when a reaction “is shifting to the left”shifting to the left”
There are more product then reactants in There are more product then reactants in an equilibrium expression, so therefore an equilibrium expression, so therefore according to Le Chatelier’s Principle, the according to Le Chatelier’s Principle, the reaction will create more reactants to reaction will create more reactants to reach equilibriumreach equilibrium
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What does it mean when a reaction “lies to What does it mean when a reaction “lies to the left”the left”
The concentration reactants is higher than The concentration reactants is higher than products in an equilibrium expression.products in an equilibrium expression.
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When heat is added to an exothermic When heat is added to an exothermic reaction, which way will the reaction shift.reaction, which way will the reaction shift.
Shifts left. Exothermic acts as a product, Shifts left. Exothermic acts as a product, so the reaction will shift to the reactantsso the reaction will shift to the reactants
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What changes in a system cause Le What changes in a system cause Le Chatelier’s Principle to go into affectChatelier’s Principle to go into affect
1) Change in concentration1) Change in concentration
2) Change in volume/pressure2) Change in volume/pressure
3) Change in temperature3) Change in temperature
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What is the reaction quotient?What is the reaction quotient?
Q is the concentrations of the equilibrium Q is the concentrations of the equilibrium expression at a given moment in time. expression at a given moment in time.
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Why is the reaction quotient helpful?Why is the reaction quotient helpful?
Determining whether a reaction has reach Determining whether a reaction has reach equilibrium, and determining which way it equilibrium, and determining which way it will shift based on its current standing.will shift based on its current standing.
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What does it mean if What does it mean if
Q > KQ > K
Q < KQ < K
Q = KQ = K
Currently the reaction has...Currently the reaction has...
……too much product, shift lefttoo much product, shift left
……too much reactant, shift righttoo much reactant, shift right
……reached equilibriumreached equilibrium
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Which way will the reaction proceed with Which way will the reaction proceed with the following equation and concentrationsthe following equation and concentrations
NN2(g) 2(g) + O+ O2(g) 2(g) 2NO 2NO (g) (g)
NN22= 0.55M, O= 0.55M, O22 = 0.35M, NO = 0.04M = 0.35M, NO = 0.04M
KKeqeq = 0.0025 = 0.0025
Will shift left Will shift left (click 3 times for explanation)(click 3 times for explanation)
Q = [NO]Q = [NO]22 / [N / [N22][O][O22]]
Q = [0.04M]Q = [0.04M]22 / [0.55M][0.35M] / [0.55M][0.35M]
Q = 0.0083, Q > K, currently product Q = 0.0083, Q > K, currently product favoredfavored
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Which way will the reaction proceed for Which way will the reaction proceed for the following equation and concentrationsthe following equation and concentrations
CaCOCaCO3(s) 3(s) CaO CaO(s) (s) + CO+ CO2(g)2(g)
[CO2] = 0.0004M[CO2] = 0.0004M
KKeqeq = 5.10 = 5.10
It will shift left It will shift left (click 3 times for explanation)(click 3 times for explanation)
Q = 1 / [COQ = 1 / [CO22]]
Q = 1 / [0.0004M]Q = 1 / [0.0004M]
Q = 2500, Q > K , product favored Q = 2500, Q > K , product favored currently.currently.
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The point of chemistry in industry is to…The point of chemistry in industry is to…
As the book states “Chemical As the book states “Chemical manufacturers are in business to make manufacturers are in business to make money” (285)*money” (285)*
*Deters, Kelly. Chemistry. Dubuque, IA: Kendall/Hunt, 2009. Print.
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What does a large KWhat does a large Keq eq mean?mean?
The reaction is product favored.The reaction is product favored.
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What does a small KWhat does a small Keq eq mean?mean?
The reaction is reactant favored.The reaction is reactant favored.
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What phases of matter are not included in What phases of matter are not included in an equilibrium expression and whyan equilibrium expression and why
Liquids and solids. Only aqueous solutions Liquids and solids. Only aqueous solutions and gases are included, since equilibrium and gases are included, since equilibrium is measured in concentration. Liquids and is measured in concentration. Liquids and solids have a fixed volume and therefore solids have a fixed volume and therefore concentrations cannot change.concentrations cannot change.
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Which way will the following reaction Which way will the following reaction proceed if volume increasesproceed if volume increases
2SO2SO2(g) 2(g) + O+ O2(g) 2(g) 2SO 2SO3(g) 3(g)
Shift left. When volume increases, the Shift left. When volume increases, the reaction shifts to the side with more reaction shifts to the side with more gaseous moles.gaseous moles.
Final JeopardyFinal Jeopardy
For the reaction below, find the For the reaction below, find the concentration of NO if the Kconcentration of NO if the Keqeq is 0.0025 is 0.0025 and the concentrations of Nand the concentrations of N22 and O and O22 at at equilibrium are respectively 0.55M and equilibrium are respectively 0.55M and 0.92M0.92M
NN2(g) 2(g) +O+O2(g) 2(g) 2NO 2NO (g) (g)
0.036M = [NO] 0.036M = [NO] (click 3 times for explanation)(click 3 times for explanation)
KKeqeq = [NO] = [NO]22 / [N / [N22][O][O22] ]
0.0025 = [NO]0.0025 = [NO]22 / (0.55M)(0.92M) / (0.55M)(0.92M)
Solve for [NO]Solve for [NO]
