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Item stem:          Which energy diagram best matches the proposed mechanism for this exothermic reaction?                 E + S      ES              (fast)                 ES       E + P              (slow)

The solubility of an unknown salt is shown in the graph.  If a solution is unsaturated at 30 oC, what happens when the solution is cooled?

The formation of hydrazine, N2H4, is                                            N2(g) + 2H2(g) ⇌ N2H4(l)  has the energy diagram shown.  Which change will increase the value of K?

The pain reliever codeine is a weak base with a Kb equal to 1.6×10–6. What is the pH of a 0.05 M aqueous codeine solution?

The reaction of                                                 2N2O5(g) →  4NO2(g) + O2(g) is experimentally determined to be first order.  What experimental data would support this conclusion?

What is the molar concentration of an aqueous sugar solution with an osmotic pressure of 318.4 mmHg at 25 oC? 1 atm = 760 mmHg and R = 0.0821 (L·atm)/(mol·K)  

What will be the result if 100 mL of 0.06 M Mg(NO3)2 is added to 50 mL of 0.06 M Na2C2O4?  Assume the reaction is taking place at 25 °C.  (Ksp of MgC2O4(s) at 25 °C = 8.6×10–5)

When the reaction:         CH3Cl(g) + H2O(g) 

A homogeneous solution contains copper(II) ions (Cu2+), silver ions (Ag+) and potassium ions (K+).  You have sodium bromide (NaBr) and sodium sulfide (Na2S) available to use.  What should you add and in what order to separate the three metal ions?

When decays in part of the uranium decay series, there are two pathways, one of alpha emission and one of beta emission.  When emits a beta particle, what is the product?