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Describe the general approaches that are used to determine the mechanism of catalysis of an enzyme. Include in the approaches how covalent modification, affinity labeling, inhibitor kinetics, structure determinations, pH, site-directed mutagenesis, etc. facilitate the determination.
A 0.200 M solution of a weak monoprotic acid HA is found to have a pH of 3.00 at room temp. What is the ionizaiton constant of this acid?
Ethanol melts at -114 C and boils at 78 C. The enthalpy of fusion of ethanol is 5.02 kJ/mol, and its enthalpy of vaporization is 38.56 kJ/mol. The specific heats of solid and liquid ethanol are 0.97 J/g.K and 2.3 J/g.K, respectively.
calculate the purity of the ammonium chloride in the sample.
redox reaction NO2- is oxidized to NO3 and Ag is reduced to Ag. Complete and balance the equation for this reaction in basic solution
A technician was accidentally exposed to potassium-42 while doing some brain scans for possible tumors. the error was not discovered until 48h later when the activity of the potassium-42 sample was 2.1?ci .if potassium-42 has a half-life of 12 h
The reaction of 2,2-dimethyl-1-propanol with HBr is very slow and gives 2-bromo-2-methyl-propane as the major product
Assume that 0.406 mol Carbon (g) is placed in a cylinder that is expanding. The barometric pressure on the outside of the cylinder is constant at 1.00 atm and the temperature is 300.0 K.
The molar mass of an unknown salt is 75.6. If 2.29 g is added to 71.2 mL of water the temperature changes from 20.70oC to 21.39oC. What is the molar heat of solution (J/mol) of the salt?
When 1.550 g of liquid hexane (C6H14) undergoes combustion in a bomb calorimeter, the temperature rises from 25.87 ºC to 38.13 ºC. Find ?E rxn for the reaction in kJ/mol hexane. The heat capacity of the bomb calorimeter, determined in a separate e..
if 5.00 g of each NH3, O2, and CH4 are reacted, what mass of HCN will be produced, assuming 100% yield
There are 3 different possible structures (known as isomers) for a dibromoethene molecule, C2H2Br2. One of them has no net dipole moment, but the other two do. Draw a structure for each isomer. Include H atoms.
There are three isomeric dichlorocyclopropanes. Their 1H NMR spectra show one signal for isomer 1, two signals for isomer 2, and three signals for isomer
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