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Cell membranes are now known to be organized into double monolayers or "bilayers" of molecules with nonpolar tails and polar heads. Researchers in 1925 first demonstrated the existence of the bilayer in the cell membrane by disrupting the cell membranes from a known number of cells. The lipids from the broken cell membranes covered a water surface with about twice the area of the cell membranes themselves. Suppose all of the cell membranes in a sample of cells were disrupted and added dropwise to water in a Petri dish until a monolayer formed. Estimate the average area of a cell in square micrometers, and the diameter of a single cell in micrometers, using the data below. Assume the cells are roughly spherical. What is the average cell surface area
You mix 50 ml of a weak monoprotic acid with 50 ml of NaOH solution in a coffee cup calorimeter. Both solutions and the calorimeter were initially at 22 C.
buffer solution from a solution of 0.200-M aniline, C6H5NH2, a weak base, and a solution of 0.100-M hydrochloric acid. take the pKa of aniline to be 9.13.
Octane has a vapor pressure of 40. torr at 45.1 degrees celcius and 400. torr at 104.0 degrees celcius. What is its heat of vaporization (R=8.214 J/K mol)
25 mL of 0.10 M HCl is mixed with 25 mL of .43 M NH3. What is the resulting pH?
What is the approximate pH of a solution of the salt NH4(O2CCH3) Ammonium Acetate? No calculations, only reasoning needed.
Calculate the pH and percent ionization of a 0.10 M solution of CH3NH2
A 0.451 M solution of a weak acid, HA, has a pH of 4.01. Calculate Ka for the acid. Use E notation and 3 significant figures.
Which of the following elements would you expect to gain electrons in chemical changes
The spherical r theta phi equation needs to be used but am having difficulty with the integral of the equations.
Write the correct equilibrium constant expression for each reaction and indicate its numerical value
What is the gas pressure (in atm) inside a 2.43-L bulb that contains 2.88-g of Ne at a temperature of 32.9 C?
the iron oxide reacts to form water vapor and Fe(s) but the aluminum oxide remains unreacted. if the residue following heating weighs 1.596g, determine the weight percent of iron oxide in the original mixture.
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