If you add acid to a buffer, how will the pH change?

Iodine-131 undergoes beta emission with a half-life of 8.02 days. If you start with 44.3 mg of the material, how long will it take for the amount of iodine-131 to drop to 15.3 mg?   

Identify the missing particle in the following nuclear equation: Th → He + ?  

Calculate ΔS°rxn for the following reaction. The S∘ for each species is shown below the reaction. C2H2(g) + 2 H2(g) → C2H6(g) S°(J/mol∙K)      200.9         130.7             229.2         DSsurr = (-) DHsys /T       DSsys = S n (Soproducts) – S n (Soreactants)       DSorxn = (SnpSoproducts) – (SnrSoreactants)

What is TRUE if ln K is negative?                                                                                                                      DGo = – RT ln K

Radioactivity results from the decay of unstable _____.

Referring to the chart below — Does the broad or narrow beam curve require a greater HVL?

The control booth for the x-ray operator is a[answera]protective barrier that allows no more than[answerb]mr per week.  

Lead is used as a protective barrier in diagnostic imaging.  It is selected so that _________ will occur within the lead atom.

The source to skin distance must be no less than _______ cm on stationary fluoroscopy units.