[8] A sample of °Kr (t1/2 = 32 s) is to be used in a study of a patient's respiration. How soon after its creation must it be administered to the patient if the activity must be at least 60 % of the original activity?

How does poisoning cause a catalyst to deactivate? Derive the equation for poisoning-related catalyst deterioration.

Which of these reactions is correct? * A. 3Na,S + 2AIN → 2NAN, + 3AI,S, B. 3Na,S + 2AIN → 2Na,Al, + 3NS, C. 3Na,S + 2AIPO, → 2Na,PO, + Al,S, D. No reaction O A B O D

Ni (s)   +   4 CO (g)     Ni(CO)4 (g) In which direction will the reaction shift if the reaction was heated on a hotplate?

Illustrate the process of determining the direction of equilibrium using pKa ?

Q8: You add 22.45g of calcium sulfate (CaSO4(s)) to a 100.00 mL volumetric flask and fill it with water. What is the Ksp for calcium sulfate if you measure the [Ca*2] to be 0.0030M.

In the enzymatic reaction of S → P, if ΔG′° = −6.0 kJ/mol and both [S] and [P] are present at 1 mM, what is ΔG? Note: R = 8.315 × 10−3 kJ/mol · K and T = 310 K.

Consider the quilibrium reaction between X and Y, as shown below: X=Y AG The reaction is started with 10 mmol of X; no Y is initially present. After 48 hours, analysis reveals the presence of 10 mmol of X and 0 mmol of Y. Which is the most likely explanation? = −1 - 45 kJ mol X and Y have reached equilibrium concentrations. An enzyme has shifted the equilibrium toward X. Formation of Y is kinetically slow; equilibrium has not been reached by 48 hours. Formation of Y is thermodynamically unfavorable. Two of the above explanations are reasonable.