Useful Information: sodium metam: Commercial grade sodium metam is 33% pure sodium metam by weight and has a density of 1.2 g/mL. Hydrolysis of metam (Methyl isothiocynate) + H2S Rate constants for hydrolysis for metam (base catalyzed hydrolysis is negligible) = 300 mol -1 L. sec -1 , = 1 x 10-8 sec-1 Metam also undergoes photolysis to methyl isothiocyanate with a half-life of 1.6 hrs. Data for Sacramento River discharge Q = 75,000 L/min mean depth = 0.30 m pH = 7.8 mean width = 3.2 m dispersion coefficient D = 1.6 x 102 m2/min Assuming the spill acts acts as a single point source. How long does it take for the maximum contaminant concentration to get to Lake Shasta? If Na+ acts as conservative (i.e., it is not transformed) tracer, calculate the maximum concentration (in g/L) at Lake Shasta. (Hint: remember that sodium only constitutes a fraction of the total mass of sodium metam, you will need to use molar masses) Calculate the maximum concentration of metam that will be encountered at Lake Shasta if photolysis is the only mechanism of transformation. Calculate the maximum concentration of metam that will be encountered Lake Shasta if photolysis and hydrolysis are both occurring.
Catalysis and Enzymatic Reactions
Catalysis is the kind of chemical reaction in which the rate (speed) of a reaction is enhanced by the catalyst which is not consumed during the process of reaction and afterward it is removed when the catalyst is not used to make up the impurity in the product. The enzymatic reaction is the reaction that is catalyzed via enzymes.
Lock And Key Model
The lock-and-key model is used to describe the catalytic enzyme activity, based on the interaction between enzyme and substrate. This model considers the lock as an enzyme and the key as a substrate to explain this model. The concept of how a unique distinct key only can have the access to open a particular lock resembles how the specific substrate can only fit into the particular active site of the enzyme. This is significant in understanding the intermolecular interaction between proteins and plays a vital role in drug interaction.
Useful Information:
sodium metam: Commercial grade sodium metam is 33% pure sodium metam by weight and has a density of 1.2 g/mL.
Hydrolysis of metam (Methyl isothiocynate) + H2S
Rate constants for hydrolysis for metam (base catalyzed hydrolysis is negligible)
= 300 mol -1 L. sec -1 , = 1 x 10-8 sec-1
Metam also undergoes photolysis to methyl isothiocyanate with a half-life of 1.6 hrs.
Data for Sacramento River
discharge Q = 75,000 L/min
mean depth = 0.30 m
pH = 7.8
mean width = 3.2 m
dispersion coefficient D = 1.6 x 102 m2/min
- Assuming the spill acts acts as a single point source. How long does it take for the maximum contaminant concentration to get to Lake Shasta?
- If Na+ acts as conservative (i.e., it is not transformed) tracer, calculate the maximum concentration (in g/L) at Lake Shasta. (Hint: remember that sodium only constitutes a fraction of the total mass of sodium metam, you will need to use molar masses)
- Calculate the maximum concentration of metam that will be encountered at Lake Shasta if photolysis is the only mechanism of transformation.
Calculate the maximum concentration of metam that will be encountered Lake Shasta if photolysis and hydrolysis are both occurring.
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