You are evaluating a radiograph like the one shown in the image below for mAs and kVp.  The radiograph appears overall too dark.  The anatomy of interest appears to be adequately penetrated by the x-rays.  The radiographic density of the air on the radiograph appears dark gray but not black.   Which of the following adjustments should you make to improve this radiograph?

The below questions are bonus feedback questions Did you have enough time to complete this exam?

Match the compounds with their most likely sorption mechanisms.

Write the correct word from each parentheses in the blanks. D2L doesn’t understand type-o’s so please check your spelling or copy-paste from the parentheses for full credit. As pH increases, [H+] in solution _______ (increases/decreases) causing the acidic or basic surface functional groups to  _______ (accept/donate) H+. As a result, the charges of the surface functional groups become more _______ (positive/negative). Consequently, cation adsorption and CEC _______ (increase/decrease), whereas anion adsorption and AEC _______ (increase/decrease) with increasing pH.

Which of the following reactions are most likely to cause acidification? Select up to 3

In the water sample described in the previous question, what is the activity of the Mg2+ ion?  Enter your answer in scientific notation, rounded to 3 significant figures _______ x10^ _______

As ionic potential increases…

Consider the table of water quality data for a stream sample (below). One important cation is missing from this table. Assume that no ion pairs or solid precipitates are present in the sample. Fill in the four boxes labeled A, B, C and D  For A, format answer as: A, or A^#- / A^#+ if there is a charge For B-E, type the numerical value If needed, use E’s to designate scientific notation to make numbers fit in the blanks (ex: 0.1 = 1.00E-01; 10 = 1.00E+01). Concentration (mg/L) Concentration (mmoles/L) Charge Concentration (meq/L) Total alkalinity (titratable, as mg/L CaCO3) 294 pH 7.4 3.98E-05 3.98E-05 A B C D Mg2+ 30 1.234 2.469 Na+ 14 0.609 0.609 K+ 3 0.077 0.077 Total cation charges E pOH 6.6 2.51E-04 2.51E-04 Total orthophosphate P 0.05 2.30E-03 nitrate N 1.0 0.071 0.071 sulfate 86 0.895 1.791 chloride 40 1.130 1.130 DOC (mg of C/L) 2 0.2 HCO3- 357 5.85 5.85 Total anion charges 8.87 Charge balance 0.00% Calculated ionic strength* 0.014 *Needed for upcoming questions _______ B:  _______ C:  _______ D: _______ E: _______

A {L} L sample of stream water requires {mL} mL of {M} M HCl to titrate to pH 4.5. What is its alkalinity, reported in meq/L? Provide 3 significant figures in your answer. Attachments are enabled so you can show work here or in the “show work” question towards the bottom of the exam.

About how long did you spend working on module 2 (including watching videos)?