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Wednesday, January 11th Take out your 14.1-14.3 notes
Grab a whiteboard, marker, and rag Today: practice
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Equilibrium Expressions
đž= [đđđđđ˘đđĄđ ] [đđđđđĄđđđĄđ ] Coefficients become exponents (like with rate laws!) NO LIQUIDS OR SOLIDS!
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Write the Keq expression and determine whether the reaction is reactant favored, product favored, or neither N2(g) + 3 H2(g) â 2 NH3(g) At equilibrium: [N2] = 1.50 M [H2] = 2.00 M [NH3]= 0.01 M
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Write the Keq expression and determine whether the reaction is reactant favored, product favored, or neither HF(aq) â H+ (aq) + F- (aq) At equilibrium: [HF] = 0.55 M [H+] = M [F-]= M
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Write the Keq expression and determine whether the reaction is reactant favored, product favored, or neither Fe3+ (aq) + SCN- (aq) â FeSCN2+ (aq) At equilibrium [Fe3+] = 0.55 M [SCN-] = M [FeSCN2+] = M
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Summarize: Fill in the blanks with product-favored, reactant-favored, and approximately equal
Keq state of equilibrium Keq >> 1 Keq << 1 Keq ďť 1
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Knowing that water has a density of 1.00 g/mLâŚ
What is the mass of 1.00 Liter of water? How many moles are in 1.00 L of H2O? What is the concentration (M) of water? Can you get more moles of water into this liter of water? Therefore, [H2O] (is or is not) constant?
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Write equilibrium expression for each of the following
CaCO3(s) â CaO(s) + CO2(g) Ni(s) + 4CO(g) â Ni(CO)4(g) 5CO(g) + I2O5(s) â I2(g) + 5CO2(g) Ca(HCO3)2(aq) â CaCO3(s) + H2O(l) + CO2(g) AgCl(s) â Ag+(aq) + Cl-(aq)
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Rate the reactions in order of their increasing tendency to proceed toward completion
4NH3(g) + 3O2(g) â 2N2(g) + 6H2O(g) Kp = 1 x 10228 N2(g) + O2(g) â 2NO(g) Kp = 5 x 10-31 2HF(g) â H2(g) + F2(g) Kp = 1 x 10-13 2NOCl(g) â 2NO(g) + Cl2(g) Kp = 4.7 x 10-4
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Write the Keq expression for 2SO2 (g) + O2 (g) â 2SO3 (g)
Calculate the value of Keq if the equilibrium values are [SO2] = 1.50 M [O2] = 1.25 M [SO3] = 3.50 M Write the Keq expression for the reverse reaction Calculate the new value of Keq How do the expressions and values compare to each other?
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Consider an equilibrium that occurs in two steps
1. H2S(aq) â H+(aq) + HS-(aq) 2. HS-(aq) â H+(aq) + S2-(aq) Write the overall reaction. How do the Keqs for the two steps (Keq1 & Keq2) relate to the Keq of the overall reaction? Show your work to accomplish that answer.
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Homework Notes on MasteringChem due Monday night (but you will also have notes this weekend!!)
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