Wednesday, January 11th Take out your 14.1-14.3 notes Grab a whiteboard, marker, and rag Today: 14.1-14.3 practice

Equilibrium Expressions 𝐾= [𝑝𝑟𝑜𝑑𝑢𝑐𝑡𝑠] [𝑟𝑒𝑎𝑐𝑡𝑎𝑛𝑡𝑠] Coefficients become exponents (like with rate laws!) NO LIQUIDS OR SOLIDS!

Write the Keq expression and determine whether the reaction is reactant favored, product favored, or neither N2(g) + 3 H2(g) ⇌ 2 NH3(g) At equilibrium: [N2] = 1.50 M [H2] = 2.00 M [NH3]= 0.01 M

Write the Keq expression and determine whether the reaction is reactant favored, product favored, or neither HF(aq) ⇌ H+ (aq) + F- (aq) At equilibrium: [HF] = 0.55 M [H+] = 0.001 M [F-]= 0.001 M

Write the Keq expression and determine whether the reaction is reactant favored, product favored, or neither Fe3+ (aq) + SCN- (aq) ⇌ FeSCN2+ (aq) At equilibrium [Fe3+] = 0.55 M [SCN-] = 0.001 M [FeSCN2+] = 0.001 M

Summarize: Fill in the blanks with product-favored, reactant-favored, and approximately equal Keq state of equilibrium Keq >> 1   Keq << 1 Keq  1

Knowing that water has a density of 1.00 g/mL… 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?

Write equilibrium expression for each of the following CaCO3(s) ⇌ CaO(s) + CO2(g) Ni(s) + 4CO(g) ⇌ Ni(CO)4(g) 5CO(g) + I2O5(s) ⇌ I2(g) + 5CO2(g) Ca(HCO3)2(aq) ⇌ CaCO3(s) + H2O(l) + CO2(g) AgCl(s) ⇌ Ag+(aq) + Cl-(aq)

Rate the reactions in order of their increasing tendency to proceed toward completion 4NH3(g) + 3O2(g) ⇌ 2N2(g) + 6H2O(g) Kp = 1 x 10228 N2(g) + O2(g) ⇌ 2NO(g) Kp = 5 x 10-31 2HF(g) ⇌ H2(g) + F2(g) Kp = 1 x 10-13 2NOCl(g) ⇌ 2NO(g) + Cl2(g) Kp = 4.7 x 10-4

Write the Keq expression for 2SO2 (g) + O2 (g) ⇌ 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?

Consider an equilibrium that occurs in two steps 1. H2S(aq) ⇌ H+(aq) + HS-(aq) 2. HS-(aq) ⇌ 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.

Homework Notes on 14.4-14.6 MasteringChem 14.1-14.6 due Monday night (but you will also have notes this weekend!!)