Jeopardy $100 Equilibrium Constants Le Chatelier’s Principle Reaction Quotients Miscellaneous $200 $300 $400 $500 $400 $300 $200 $100 $500 $400 $300 $200.

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Presentation transcript:

Jeopardy $100 Equilibrium Constants Le Chatelier’s Principle Reaction Quotients Miscellaneous $200 $300 $400 $500 $400 $300 $200 $100 $500 $400 $300 $200 $100 $500 $400 $300 $200 $100 $500 $400 $300 $200 $100 Final Jeopardy Final Jeopardy

1 - $100 Chemical Equilibrium is defined as.. Chemical Equilibrium is defined as.. When the rate of the forward reaction equals the rate of the reverse reaction When the rate of the forward reaction equals the rate of the reverse reaction

1 - $200 Collision theory states that as reaction not at equilibrium, has its forward reaction increase, its reversible reaction will ________. Collision theory states that as reaction not at equilibrium, has its forward reaction increase, its reversible reaction will ________. Decrease. Because less molecules means it will collide less often, with the correct requirements. Decrease. Because less molecules means it will collide less often, with the correct requirements.

1 - $300 True or false, the time it takes for systems to reach equilibrium are always the same. False. The time it takes for reactions to reach equilibrium all vary. Some reach it very slowly or very quickly. But never instantaneous.

1 - $400 Collision Theory states for a reaction to occur the molecule must… 1) Collide 2) Collide with enough minimum energy 2) Collide with the correct orientation

1 - $500 Dynamic equilibrium is… Dynamic equilibrium is… When the forward and reverse reactions are at equal rates, but are continuing to occur. They continue to react, but the overall ratio stays the same. When the forward and reverse reactions are at equal rates, but are continuing to occur. They continue to react, but the overall ratio stays the same.

2 - $100 The form of concentration in which equilibrium expressions are written in is.. The form of concentration in which equilibrium expressions are written in is.. Molarity (mol/liter) Molarity (mol/liter)

2 - $200 What is the K eq for the reaction of What is the K eq for the reaction of N 2(g) + O 2(g)  2NO (g) If the concentrations of N 2, O 2, and NO are respectively 0.48M,.075M, and 0.030M K eq = (no units) K eq = (no units)

2 - $300 Write the equilibrium expression for the following reversible reaction: Write the equilibrium expression for the following reversible reaction: Fe 2 O 3(s) +H 2(g)  2Fe (s) +3H 2 O (g) K eq = [H 2 O] 3 / [H 2 ] 3 K eq = [H 2 O] 3 / [H 2 ] 3

2 - $400 True or False: Temperature does not affect the equilibrium expression. True or False: Temperature does not affect the equilibrium expression. False. Temperature affects the rate of either forward or reverse reaction so that it changes the numerical value of the expression. False. Temperature affects the rate of either forward or reverse reaction so that it changes the numerical value of the expression.

2 - $500 What are the units on the equilibrium expression constant for What are the units on the equilibrium expression constant for K eq = [NO] 2 / [N 2 ][O 2 ] No units. (M 2 / M x M ) = no units No units. (M 2 / M x M ) = no units

3 - $100 Describe Le Chatelier’s Principle. Describe Le Chatelier’s Principle. When stress is put on a system, the system will shift to reach equilibrium again. When stress is put on a system, the system will shift to reach equilibrium again.

3 - $200 What does it mean when a reaction “is shifting to the left” What does it mean when a reaction “is shifting to the left” There are more product then reactants in an equilibrium expression, so therefore according to Le Chatelier’s Principle, the reaction will create more reactants to reach equilibrium There are more product then reactants in an equilibrium expression, so therefore according to Le Chatelier’s Principle, the reaction will create more reactants to reach equilibrium

3 - $300 What does it mean when a reaction “lies to the left” What does it mean when a reaction “lies to the left” The concentration reactants is higher than products in an equilibrium expression. The concentration reactants is higher than products in an equilibrium expression.

3 - $400 When heat is added to an exothermic reaction, which way will the reaction shift. When heat is added to an exothermic reaction, which way will the reaction shift. Shifts left. Exothermic acts as a product, so the reaction will shift to the reactants Shifts left. Exothermic acts as a product, so the reaction will shift to the reactants

3 - $500 What changes in a system cause Le Chatelier’s Principle to go into affect What changes in a system cause Le Chatelier’s Principle to go into affect 1) Change in concentration 1) Change in concentration 2) Change in volume/pressure 3) Change in temperature

4 - $100 What is the reaction quotient? What is the reaction quotient? Q is the concentrations of the equilibrium expression at a given moment in time. Q is the concentrations of the equilibrium expression at a given moment in time.

4 - $200 Why is the reaction quotient helpful? Why is the reaction quotient helpful? Determining whether a reaction has reach equilibrium, and determining which way it will shift based on its current standing. Determining whether a reaction has reach equilibrium, and determining which way it will shift based on its current standing.

4 - $300 What does it mean if What does it mean if Q > K Q < K Q = K Currently the reaction has... Currently the reaction has... …too much product, shift left …too much reactant, shift right …reached equilibrium

4 - $400 Which way will the reaction proceed with the following equation and concentrations Which way will the reaction proceed with the following equation and concentrations N 2(g) + O 2(g)  2NO (g) N 2 = 0.55M, O 2 = 0.35M, NO = 0.04M K eq = Will shift left (click 3 times for explanation) Will shift left (click 3 times for explanation) Q = [NO] 2 / [N 2 ][O 2 ] Q = [0.04M] 2 / [0.55M][0.35M] Q = , Q > K, currently product favored

4 - $500 Which way will the reaction proceed for the following equation and concentrations Which way will the reaction proceed for the following equation and concentrations CaCO 3(s)  CaO (s) + CO 2(g) [CO2] = M K eq = 5.10 It will shift left (click 3 times for explanation) It will shift left (click 3 times for explanation) Q = 1 / [CO 2 ] Q = 1 / [0.0004M] Q = 2500, Q > K, product favored currently.

5 - $100 The point of chemistry in industry is to… The point of chemistry in industry is to… As the book states “Chemical manufacturers are in business to make money” (285)* As the book states “Chemical manufacturers are in business to make money” (285)* *Deters, Kelly. Chemistry. Dubuque, IA: Kendall/Hunt, Print.

5 - $200 What does a large K eq mean? What does a large K eq mean? The reaction is product favored. The reaction is product favored.

5 - $300 What does a small K eq mean? What does a small K eq mean? The reaction is reactant favored. The reaction is reactant favored.

5 - $400 What phases of matter are not included in an equilibrium expression and why What phases of matter are not included in an equilibrium expression and why Liquids and solids. Only aqueous solutions and gases are included, since equilibrium is measured in concentration. Liquids and solids have a fixed volume and therefore concentrations cannot change. Liquids and solids. Only aqueous solutions and gases are included, since equilibrium is measured in concentration. Liquids and solids have a fixed volume and therefore concentrations cannot change.

5 - $500 Which way will the following reaction proceed if volume increases Which way will the following reaction proceed if volume increases 2SO 2(g) + O 2(g)  2SO 3(g) Shift left. When volume increases, the reaction shifts to the side with more gaseous moles. Shift left. When volume increases, the reaction shifts to the side with more gaseous moles.

Final Jeopardy For the reaction below, find the concentration of NO if the K eq is and the concentrations of N 2 and O 2 at equilibrium are respectively 0.55M and 0.92M For the reaction below, find the concentration of NO if the K eq is and the concentrations of N 2 and O 2 at equilibrium are respectively 0.55M and 0.92M N 2(g) +O 2(g)  2NO (g) 0.036M = [NO] (click 3 times for explanation) 0.036M = [NO] (click 3 times for explanation) K eq = [NO] 2 / [N 2 ][O 2 ] = [NO] 2 / (0.55M)(0.92M) Solve for [NO]