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At pH 4, histidine (pKs are α-carboxylate 1.8, α-amino 9.33, 6.04 imidazole)would have what charges on each functional group and what would be the net charge?
A loudspeaker of mass 16.0 is suspended a distance of = 2.00m below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of = 2.70 . What is the tension in each
You conduct an experiment where N2 is collected over water in a 2.66 L flask at 26.oC. At the conclusion of the experiment, the total pressure in the flask is 594. torr. What is the pressure of N2
the three naturally occurring isotopes of potassium are 39k, 38.963707u; 40k, 39.363999 u; and 41k. the percentage natural abundances of 39k and 41k are 93.2581% and 6.7302%, respectively. determine
Metallic magnesium reacts with steam to produce magnesium hydroxide and hydrogen gas. If 17.1 g of Mg are heated with 9 g of H2O, what is the limiting reactant?
In the hydraulic press used in a trash compactor, the radii of the input piston and the output plunger are 5.5 10-3 m and 5.5 10-2, respectively. If the height difference between the input piston an
a 0.5224-g sample of an unknown monoprotic acid was titrated with 0.0998M of NaOH. the equivalence point of the titration occurs at 23.82ml. Determine the molar mass of the unknown acid
A single extraction with 100 mL of CHCl3 extracts or removes 88.5% of the weak acid, HA, from 50& ; mL of aqueous solution. What is the partition coefficient, K, for HA at a pH = 3.00? The Ka for HA
A 21.0 kg child on a 3.00 m long swing is released from rest when the ropes of the swing make an angle of 32.0° with the vertical. (a) Neglecting friction, find the child's speed at the lowest p
You just measured a block of wood and obtained the following information: mass= 55.120g, length= 8.5 cm, height= 4.3cm,width=3.3cm. what is the volume and density of the wood.
A single extraction with 100 mL of CHCl3 extracts or removes 88.5% of the weak acid, HA, from 50& ; mL of aqueous solution. What is the distribution coefficient, D, for HA at a pH = 3.00? The Ka for
How many balloons can be filled with He? assume that the cylinder can provide He until its internal pressure reaches 1.00 atm(i.e., there are !#! atmospheres of usable He in the cylinder).
If the coefficient of kinetic friction between the 40 kg crate and the floor is 0.680, what horizontal force must a worker exert to just start the motion of the crate?
A beaker with 1.20×102 of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 . A student adds 5.70 of a 0.
Using the de Broglie relation and ignoring relativistic effects, calculate the wavelength of a 19F+ ion which is moving with a speed of 4.255 x 105 m/s. The mass of 19F is 18.9984 a.m.u
Which of the following aminoacids are likely to be linked to only one specied of tRNA? What are their anticodons? Don't forget to check how many different codons specify each of these aminoacids.
A flammable gas made up only of carbon and hydrogen is found to effuse through a small hole in 1.50 minutes. Calculate the molar mass of the unknown gas and suggest what this gas might be.
Calculate the theoretical percentage of water for the following. use atomic mass to 0.1amu and round your answer nicl2 6h2o
A wooden sphere of radius 7.00 cm and density 0.810 g/cm3 is falling through the air. A. Determine its terminal speed.
the density of a gaseous compound of phosphorous is 0.943g/L at 474K whens its pressure is 728 torr. what is the compounds molar mass?
A balloon is floating around outside your The temperature outside is 33, and the air pressure is 0.800 . Your neighbor, who released the balloon, tells you that he filled it with 3.10 of gas. What
a 0.150 g sample of KIO3 required 10.7 mL of Na2S2O3 solution for its standardization. What is the molarity of the Na2S2O3 solution?
What is the boiling point of a solution that contains 4.00 moles MgSO4 in 1500. grams of water. (Kb = 0.512 oC/m; give answer to 3 decimal places)
If the bullet-block system compresses the spring by a maximum of 74.0 cm, what was the speed of the bullet at impact with the block?
What would be the charge of the functional groups (α-carboxylate, α-amino, and guanidine side chain) and the net charge of arginine at pH 7?