Blog

A solution contains {M} M (mol/L) of CaSO4 and has an overall ionic strength of {I} mol/L. What is the activity of Ca2+ in this solution? Use the Debye-Hückel limiting law and round your answer to 3 decimal places. (Note: D2L may generate unrealistic numbers since everything is randomized)

If an organic compound’s measured Kd is {Kd} when adsorbing to a soil containing {C}% organic carbon, what is the Koc of the compound? Round your answer to the nearest whole integer.

Rate how strongly you agree or disagree with the following statement: “I feel prepared to predict relative availability and mobility of contaminants and nutrients in soil based on the properties of the soil and contaminant or nutrient”

When are reduction reactions favored? (assume C is being oxidized, and some other element is being reduced)

Isotherms showing sorption of NH4+ to 3 different biochars at constant pH were fit with the Langmuir and Freundlich models. The fitted model parameters are shown below.  Freundlich Langmuir biochar  Pyrolysis temperature KF n r2 Smax KL r2 CS4s 400°C 0.418 0.280 0.955 0.954 0.554 0.959 CS5s 500°C 0.110 0.610 0.966 1.048 0.079 0.975 CS6s 600°C 0.077 0.534 0.949 0.556 0.096  0.929 Using the data, match the biochar with its properties.

Following a flooding event, Eh ___ because O2 concentrations ___ ; energy yielded from respiration also ___.

SHOW WORK HERE Upload a photo, screenshot, pdf or docx file of your handwritten or typed work here using the camera or “add file” button. If you used a spreadsheet, you must send the xlsx file or google sheet link, not a screenshot! Clearly number the question(s) so the instructor or TA knows which question(s) you were answering. Acceptable file types: jpeg, png, gif pdf Word docs (.docx, .doc) Excel files (.xlsx, .xls) Google docs or google spreadsheet links  make sure you enable access to anyone with a link DO NOT upload HEIC or other Apple-exclusive file types. This question will be graded according to what you show in your work (points divided equally among each): Formulas (if any) Numbers plugged into formulas Units shown on all non-unitless numbers, and units shown on final answer All steps clearly shown (no steps skipped), such that the reader can easily tell how you got your answer Having trouble uploading here? Go to the Assignments tab and click on the appropriate scratch paper dropbox.

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

Given the below cation data, answer this and the 2 questions that follow Cation Ionic Radius (Å ) Na+ 0.97 K+ 1.33 Mg2+ 0.66 Ca2+ 0.99 Fe3+ 0.64 Al3+ 0.51 Which cation is likely to attract water the most strongly, without undergoing hydrolysis? 

Ionic potential increases when…