Jeopardy Solutions KineticsEquilibri um Solubility and Qual Pot Pourri

100 Solutions  What information do you need to determine the molality of a 5.0 M solution of sucrose?

200 Solutions  A student wishes to prepare 0.50 liters of molar KIO3 (molecular weight 214). The proper procedure is to weigh out:_______________

300 Solutions  What is the final concentration of barium ions, [Ba 2+ ], in solution when 100. mL of 0.30 M BaCl 2 (aq) is mixed with 100. mL of M H 2 SO 4 (aq)?.1M

400 Solutions  How many milliliters of 15.8-molar NaOH must be diluted to obtain 2.5 liter of 4.0- molar NaOH?

500 Solutions What is the minimal information needed to determine the molar mass of a solute by freezing point depression?

100 Kinetics  What does a catalyst do to the rate of a reaction? Why? (Draw a graph showing this)  Speeds it up, by lowering the activation energy

200 Kinetics  The isomerization of cyclopropane to propylene is a first-order process with a half- life of 76 minutes at 300  C. The time it takes for the partial pressure of cyclopropane to decrease from 2.0 atmosphere to 0.5 atmosphere at 300  C is closest to  152 minutes

300 Kinetics  H3AsO4 + 3 I- + 2 H3O+  H3AsO3 + I3- + H2O  The oxidation of iodide ions by arsenic acid in acidic aqueous solution occurs according to the stoichiometry shown above. The experimental rate law of the reaction is:  Rate = k[H3AsO4] [I-] [H3O+]  According to the rate law for the reaction, an increase in the concentration of Iodide ion has what effect on this reaction?

400 Kinetics 2 A(g) + B(g)  2 C(g) When the concentration of substance B in the reaction above is doubled, all other factors being held constant, it is found that the rate of the reaction remains unchanged. Explain this observation in terms of the reaction mechanism.

500 Kinetics  (CH 3 ) 3 CCl(aq) + OH -  (CH 3 ) 3 COH(aq) + Cl -  For the reaction represented above, the experimental rate law is given as follows.  Rate = k[(CH 3 ) 3 CCl]  If some solid sodium solid hydroxide is added to a solution that is molar in (CH 3 ) 3 CCl and 0.10 molar in NaOH, What will happen to the rate and k?

Equilibrium CuO(s) + H2(g)  Cu(s) + H2O(g) ∆H = -2.0 kilojoules  When the substances in the equation above are at equilibrium at pressure P and temperature T, how can you shift the equilibrium to favor the reactants?

200 Equilibrium00  If 2.5 mol of N 2 O 4 gas is reacted in a 7.0 L container, what is the equilibrium concentration of NO 2 in the container? K= 4.0 x 10 -7

300 Equilibrium00  PCl 3 (g) + Cl 2 (g) ﾛ PCl 5 (g) + energy  Some PCl 3 and Cl 2 are mixed in a container at 200  C and the system reaches equilibrium according to the equation above. Which of the following causes an increase in the number of moles of PCl 5 present at equilibrium?  I.Decreasing the volume of the container  II.Raising the temperature  III.Adding a mole of He gas at constant volume

400 Equilibrium00 SO 2 (g) + O 2 (g)  2 SO 3 (g) When 0.40 mole of SO 2 and 0.60 mole of O 2 are placed in an evacuated 1.00 liter flask, the reaction represented above occurs. After the reactants and the product reach equilibrium and the initial temperature is restored, the flask is found to contain 0.30 mole of SO 3. Based on these results, the equilibrium constant, Kc, for the reaction is

500 Equilibrium00  In which of the following systems would the number of moles of the substances present at equilibrium NOT be shifted by a change in the volume of the system at constant temperature?  a.CO(g) + NO(g)  CO 2 (g) + 1 / 2 N 2 (g)  b.N 2 (g) + 3 H 2 (g)  2 NH 3(g)  c.N 2 (g) + 2 O 2 (g)  2 NO 2 (g)  d.N 2 O 4 (g)  2 NO 2 (g)  e.NO(g) + O 3 (g)  NO 2 (g) + O 2 (g)

100 Solubility & Qual  How many moles of NaF must be dissolved in 1.00 liter of a saturated solution of PbF2 at 25ºC to reduce the [Pb2+] to 1 x molar? (Ksp PbF2 at 25 ºC = 4.0x10 -8 )

200 Solubility & Qual  Barium sulfate is LEAST soluble in a 0.01 molar solution of which of the following?  a.Al 2 (SO 4 ) 3 d.NH 3  b.(NH 4 ) 2 SO 4 e.BaCl 2  c.Na 2 SO 4

300 Solubility & Qual  When dilute nitric acid was added to a solution of one of the following chemicals, a gas was evolved. This gas turned a drop of limewater, Ca(OH) 2, cloudy, due to the formation of a white precipitate. The chemical contained which of the following ions? (Sodium, bicarbonate, Magnesium, Ammonium, Sulfate)

400 Solubility & Qual Solubility & Qual  A 20.0 milliliter sample of molar K2CO3 solution is added to 30.0 milliliters of molar Ba(NO3)2 solution. Barium carbonate precipitates. The concentration of barium ion, Ba2+, in solution after reaction is:

500 Solubility & Qual What is the equilibrium concentration of chloride ions when 100 mL of.4 M AgNO3 is mixed with 200 mL of.4M NaCl?

100 Pot Pourri  What is an electrolyte?

200 Pot PourriPot Pourri  A solution of 1.0 M NaCl is diluted. What happens to volume, moles, and molarity of NaCl?

300 Pot Pourri  Rank the following three substances from weakest to strongest electrolyte.  HNO 3  C 12 H 22 O 11  HC 2 H 3 O 2

400 Pot Pourri  Consider the reaction: K=4.85  200. g of NH 4 NO 3(s) are placed in a reaction vessel containing H 2 O (g) at a concentration of 2.0 M and N 2 O( g) at a concentration of 2.0 M. After equilibrium is reached, will the mass of NH 4 NO 3(s) increase, decrease or remain unchanged?

500 Pot Pourri  What is the mole fraction of ethanol, C 2 H 5 OH, in an aqueous solution in which the ethanol concentration is 4.6 molal?