Soil organic matter (SOM) samples have charge that is pH-dependent, andmeasurements for the cation-exchange capacities (CECS) of soil organic matteraverage around 150 cmol(+)/kg SOM at neutral pH. Meanwhile, smectite clayminerals have CECS that average approximately 100 cmol(+)/kg clay. Since these twophases are the dominant contributors to soil CEC, we can use SOM content andsmectite content (if we can measure it) to estimate total soil CEC. What would beyour estimate for the total CEC (in cmol(+)/kg soil, to the nearest 0.1 cmol(+)/kg soil)of a soil that contained 3.28 % SOM and 1.0 % smectite clay by weight?

According to the data provided in the question: Soil organic matter (SOM) CEC = 150 cmolt) /bg…

Answered: Soil organic matter (SOM) samples have…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Estimate the chronic daily intake of 1,1,1-trichloroethane from exposure to a city water supply that contains a 1,1,1-trichloroethane concentration equal to the drinking water standard of 0.2 mg ・ L−1. Assume the exposed individual is a child who consumes water at the child rate for 5 years, that she swims once a week for 30 minutes, and that she takes a short (10 minute) bath every day. Assume her average age over the exposure period is 8. Assume that the average air concentration of 1,1,1-trichloroethane during the bath is 2 μg ・ m−3. Assume the dermal uptake from water (PC) is 0.0060 m ・ h−1 and that direct dermal absorption during bathing is no more than 50 percent of the available l,1,1-trichloroethane because she is not completely submerged.
The N excess/deficit factor for 100 kg of an organic material that contained 60% C (carbon) and 0.5% N (nitrogen) would likely be (assuming that 35% of the carbon is metabolized by microorganisms and the carbon and nitrogen are assimilated in a 10:1 ratio). -3.85 kg (deficit, N immobilization) -1.05 kg (deficit, N immobilization) -2.50 kg (deficit, N immobilization) -1.60 kg (deficit, N immobilization) -2.15 kg (deficit, N immobilization)
Drinking water can be obtained via (a) bottled spring water or (b) a sink-mounted reverse osmosis device. Briefly discuss two negative aspects of each, from a sustainability point of view.
Suppose the pharmacists has 1.5 L of a 20X concentrate of an antibiotic and must dispense 250 mL of a 1X solution to customers. What volume of the 1X antibiotic can the pharmacist prepare? How many customers can receive the 1 X solution?
The atmospheric ratio of peroxyacetic nitric anhydride (PAN) to PAN + inorganic nitrite varies from less than 0.1 to 0.9. High values of the ratio are associated with photo chemically aged air masses, situations where precipitation has recently occurred, and situations were unusually high nighttime nitrogen oxide concentrations are found. What do these observations tell us about the factors affecting the relative rates of formation and removal of nitrogen oxide compounds?
DATA Record all masses to the maximum number of Run 1 Run 2 sig figs 200°C 400°C 1. Mass of beaker 81.061 27.986 2. Mass of beaker + NaHCO3 85.457 32.267 3. Initial mass of NaHCO3 4.476 4.292 Mass of beaker plus products after heating. 4. 84.3 80 30.742 5. Mass of product (actual yield) There are three theoretically possible chemical reactions that could occur during the thermal decomposition of baking soda. 1) sodium bicarbonate (s) → sodium hydroxide (s) + carbon dioxide (g) 2) sodium bicarbonate (s) → sodium oxide (s) + carbon dioxide (g) + water (g) 3) sodium bicarbonate (s)→ sodium carbonate (s) + carbon dioxide (g) + water (g)
During the Antacids as Buffers simulation, it was found that calcium carbonate was slightly less effective than some other antacids, but it has the added benefit of being a source of dietary calcium. Would this be considered true or false?
To track cell growth and utilization of the limiting substrate in a bioreactor, the yield is typically used. The yield overline v is defined as Y = (X - X_{0}) / (S_{0} - S) Where X and S are the cell mass and substrate concentration at any time t and X_{0} and S_{0} are the initial cell mass and substrate concentration. Assume that your cells spend a time tl in the lag phase, and then transition to the exponential phase. Calculate the concentration of the substrate S, at any time point t in the reactor Use Monod equation in the exponential phase to relate mu net to mu max . Your final answer should only contain S. S_{0} X_{0} t, mu max and K_{s}
Calculate the percentage efficiency of extraction of phycocyanin in sample y, if the amount of phycocyanin is 57.8 mg, and the starting amount in sample x was 118.1 mg. Your answer should have one decimal place.

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