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An oil storage area abandoned 19 yrs ago had oil spilled on the ground and saturated the soil at a concentration of 400mg/kg of soil. A recent soil sample shows a concentration of 20mg/kg. A man says that the oil was reduced at a rate of 20mg/kg each year and in one year will be free of contamination. Is this a good assumption?
a 1.885g solid sample containing some feso4 is dissolved in water. the resulting solution is acidified and titrated to
Why does the absolute refractory period occur and What is happening in the cell.
Ammonia, NH3, reacts with the hypochlorite ion, OCl-, to produce hydrazine, N2H4. How many moles of hydrazine are produced from 5.85 mol of ammonia if the reaction has a 78.2%
how does the hammond postulate explaina. the greater selectivity for bromination vs. chlorination of an alkane?b. the
admiumii chloride is added to a solution of potassium hydroxide with a ph of 9.62. ksp cdoh2 2.5 x 10-14a at what
A reaction has a first order rate constant of 4.31x10-5 s-1 at 25oC and 0.00111 s-1 at 65oC. What is the value of the rate constant at 43oC
a 0.8054 g sample of an unkown monoprotic acid requires 44.30 mL of the same solution to reach the same endpoint. what is the molar mass of the unknown monoprotic acid
Magnesium oxide (MgO) has the rock salt crystal structure and a density of 3.58 g/cm3. Determine the unit cell edge length.
a student measures the conductivity of a kno3 solution and determines it to be a strong electrolyte. the student
Raw milk sours in 4.0 hours at 28 degrees celcius but takes 48 hours to sour in a refrigerator at 5 degrees celcius. Calculate the activation energy for the souring of milk?
in the topic of calorimetry how can bumping be avoided when heating water in a
Calculate the pH of a buffer that contains 0.270 M hydrofluoric acid (HF) and 0.180 M cesium fluoride (CsF). The Ka of hydrofluoric acid is 6.8 x 10^-4.
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