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In order to purify a certain protein you require 0.1M glycine buffer at pH 9.4. Unfortunately, your stock room has run out of glycine. However you manage to find two 0.1 M glycine buffer solution. O
Suppose propene (CH2=CH-CH3) is the hydrocarbon that reacts with the hydroxyl radical. Beginning with the addition of OH. radical, write the set of chemical reactions that ultimately produces an ald
The following proposal to repair the ozone layer has been made. The suggestion is to inject 'negative charges' into the lower stratosphere, and these would react with CFC's to produce harmless produ
How to calculate the mass of propylene glycol (C3 H8 O2 ) that must be added to 0.350 kg of water to reduce the vapor pressure by 2.87 torr at 40 C (P H2O at 40 C} = 55.3 torr?
In one experiment, when the barametric pressure was 741.0 torr, the bubble trapped in the inverted graduated cylinder was found to occupy 6.15 mL at 3.0 oC and 16.0 mL at 61.0 oC.
Liquid benzene and liquid n-hexane are blended to form a stream flowing at a rate of 700 lb_m/hr. The blended stream has a density of 0.850g/mL.
Solution A: 0.14g of the solute dissolves in 15.4 g of t-butanol. Solution B: 0.17 g of the solute dissolves in 12.7 g of cyclohexane. Which solution has the greatest freezing point change? Explain
A 0.442 g sample of a nonvolatile solid solute dissolves in 15.0 g of t-butanol. The freezing point of the solution is 23.9 degrees Celcius. What is the molality of the solute in the solution.
A sample of gaseous neon atoms at atmospheric pressure and 0 C contains 2.60*10^22 atoms per liter. The atomic radius of neon is 69 pm. What fraction of the space is occupied by the atoms themselve
The volume of a typical bacterical cell is on the order of 1.0 cubic microns. At pH 7.0 how many hydrogen ions are contained inside a bacterial cell?
The amino acid glycine is often used as the main ingredient of a buffer in biochemical experiments. The amino group of glycine, which has a pKa of 9.6, can exist either in the protonated form (-NH3+
What would be similar about a raft full of chemistry students and some of the cans of soda that would make them both float on the water? What would be different about the cans of soda which sank to
The solvent for an organic reaction is prepared by mixing 70.0 of acetone () with 58.0 of ethyl acetate (). This mixture is stored at 25.0 . The vapor pressure and the densities for the two pure com
Suppose that 500 g of water vapor condense to make a cloud about the size of an average room. If we assume that the latent heat released is 2.5X106 J kg-1, how much heat would be released to the air
Suppose you are given 1 kg of ice at 0°C. If the ice is placed in an insulated container holding 1 kg of water initially at 20°C, how much of the ice will melt?
Naturally occurring iodine has an atomic mass of 126.9045. A sample of 12.3849g gets contaminated with 1.00070g of a synthetic iodine with a mass of 128.9050. Find the apparent "atomic mass of the
A metal sphere weighing 18.48g is added to 20.00mL of water in a graduated cylinder. If the density of the metal is 4.50g/mL, what will be the new level of water in the graduated cylinder?
The octapeptide AVGWRVKS was digested with the enzyme trypsin. Would ion exchange or molecular exclusion be most appropriate for the separation?
How many grams of boric acid, B(OH)3 should be used to make 2L of 0.05M solution? What kind of flask would be used to prepare this solution?
A sample of the active ingredient in a nutritional mineral supplement was found to contain 0.0392 moles of iron, 0.0393 moles of sulfur, and 0.157 moles of oxygen atoms. What is the empirical formu
Water and diethyl ether are immiscible liquids. Charged compounds dissolve in water and uncharged compounds dissolve in ether. Given that benzoic acid has a pKa of 4.8 and cyclohexylamine has a pKa
In general, the attractive intermolecular forces between solvent and solute particles must be comparable or greater than solute-solute interactions for significant solubility to occur.
If a storage container has dimensions of 11.6ft X 9.8ft X16.2 ft and it is filled with nitrogen gas at a density of 4.57 g/L, what is the mass inpounds of the nitrogen gas in the container?
Many metallic catalysts, especially precious metal catalysts are deposited as thin films on materials with a very high surface area. Why is this an effective way of utilizing the precious metal? (Ex
Coliform bacteria (for example, E. coli) are excreted in large numbers in human and animal feces. Water that meets a standard of less than one coliform per 100 mL is considered safe for human consum