Answer:
Soils are a function of the five soil-forming factors: climate, organisms, relief, parent material, and time. Each of these factors range on a continuum, so the different soils of the world number in the thousands. Soil scientists recognize 12 major orders of soils.
Explanation:
Explanation:
The given data is:
The half-life of gentamicin is 1.5 hrs.
The reaction follows first-order kinetics.
The initial concentration of the reactants is 8.4 x 10-5 M.
The concentration of reactant after 8 hrs can be calculated as shown below:
The formula of the half-life of the first-order reaction is:
![k=\frac{0.693}{t_1_/_2}](https://tex.z-dn.net/?f=k%3D%5Cfrac%7B0.693%7D%7Bt_1_%2F_2%7D)
Where k = rate constant
t1/2=half-life
So, the rate constant k value is:
![k=\frac{0.693}{1.5 hrs}](https://tex.z-dn.net/?f=k%3D%5Cfrac%7B0.693%7D%7B1.5%20hrs%7D)
The expression for the rate constant is :
![k=\frac{2.303}{t} log \frac{initial concentration}{concentration after time "t"}](https://tex.z-dn.net/?f=k%3D%5Cfrac%7B2.303%7D%7Bt%7D%20log%20%5Cfrac%7Binitial%20concentration%7D%7Bconcentration%20after%20time%20%22t%22%7D)
Substitute the given values and the k value in this formula to get the concentration of the reactant after time 8 hrs is shown below:
![\frac{0.693}{1.5 hrs} =\frac{2.303}{8 hrs} x log \frac{8.4x10^-^5}{y} \\ log \frac{8.4x10^-^5}{y} =1.604\\\frac{8.4x10^-^5}{y}=10^1^.^6^0^4\\\frac{8.4x10^-^5}{y}=40.18\\y=\frac{8.4x10^-^5}{40.18} \\=>y=2.09x10^-^6](https://tex.z-dn.net/?f=%5Cfrac%7B0.693%7D%7B1.5%20hrs%7D%20%3D%5Cfrac%7B2.303%7D%7B8%20hrs%7D%20x%20log%20%5Cfrac%7B8.4x10%5E-%5E5%7D%7By%7D%20%5C%5C%20log%20%5Cfrac%7B8.4x10%5E-%5E5%7D%7By%7D%20%3D1.604%5C%5C%5Cfrac%7B8.4x10%5E-%5E5%7D%7By%7D%3D10%5E1%5E.%5E6%5E0%5E4%5C%5C%5Cfrac%7B8.4x10%5E-%5E5%7D%7By%7D%3D40.18%5C%5Cy%3D%5Cfrac%7B8.4x10%5E-%5E5%7D%7B40.18%7D%20%5C%5C%3D%3Ey%3D2.09x10%5E-%5E6)
Answer: The concentration of reactant remains after 8 hours is 2.09x10^-6M.
It is A lubricant that reduces frictions creation