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Serial dilution problem: Six test tubes are placed in a rack. To each tube add 4 mL of saline solution. Now to the first tube add 0.5 mL of concentrated protein (10 M) and mix well. Then transfer 1 mL of tube # 1 to tube # 2 and mix well. 1 mL of the contents of tube # 2 is then transferred to tube # 3, and the procedure is repeated for the remaining tubes. What is the molar concentration of protein in tube # 5? Show your answer by drawing 6 tubes
While mercury is very useful in barometers, mercury vapor is toxic. Given that mercury has a DHvap of 56.9 kJ/mol and its normal boiling point is 356.7°C, calculate the vapor pressure in mm Hg at 25°C. the answer is 4.29 x 10-3 mm Hg
Calculate the molar solubility of Fe(OH)2 in a buffer solution where the pH has been fixed at the indicated values. Ksp = 7.9 x 10-16 , Ph=7.5
Which of the following compounds exhibits the pattern of m/z values shown below? 41, 43, 57, 87, 101, 116 a. propylbromide b. sec-butyl isopropyl ether c. isopropyl bromide d. 2-hexanol e. 2-butanone
Consider the combustion of ethylene, C2H4+3O2=2CO2+2H2O. If the conentration of C2H4 is decreasing at the rate of 0.036M/s, what are (A)the rates of change in concentrations of CO2 B)rate of change of H2O concentration? (2)the rate of decrease in ..
Draw the structure for thin layer chromotography? what is it melting and boilng point, density, molecular weight and strucural formula
The complex formed between Cu(I) and 1,10 phenanthroline has a molar absorptivity of 7000 L cm-1 mol-1 at 435 nm, the wavelength of maximum absorption.
Assume the radius of a neutron to be approximately 1.0; times ;10^{ - 13} {rm cm}, and calculate the density of a neutron.
The molecular formula of glycine (an amino acid) is NH2CH2COOH, the molecular mass is 75.07grams/mole. If 10 glycines are joined together by a dehydration reaction to make a polypeptide, what would the molecular mass of the polypeptide equal.
What is the molarity of a solution that contains 41.0 g of vitamin B1 hydrochloride (molar mass = 337 g/mol}) in 280 mL of solution?
discrete inquires at a company situated on the lake and employee confesses to you that they have been dumping 89 g/min for years but that the dumping has now stopped. If lake has a residence time of 100 days, the flowrate into the lake is 10 m3/s,..
Using curved arrows, show how the species in part (a) can act as Lewis bases in their reactions with HCl, and how the species in part (b) can act as Lewis acids
The compound malonate is an analog of succinate and is a strong inhibitor of succinate dehydrogenase. The active site of the enzyme will bind to either molecule, however malonate will not undergo any reaction and gets stuck on the enzyme.
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