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Why is no voltage observed before the porous cup is immersed in the glass electrode jar?
Calculate the pH and the concentration of all species in solution at equilibrium for a 0.15 M solution of ascorbic acid, or H2C6H6O6. For ascorbic acid, Ka1 = 8.0 10^5 and Ka2 = 1.6 10^12
Find the change in kinetic energy of the object it its velocity changes so that its new x-component is 8.50 m/s and its new y-component is 5.00
The sequence or rRNA is highly conserved enven though there are mnay rRNA genes in the genome. How does this observation argue for a functional (NOT JUST STRUCTURAL) role for rRNA?
What is the kinetic energy in Joules of the emitted electrons when cesium is exposed to UV rays of frequency is 1.3 x 10^15 Hz?
A block with mass m1 slides on a frictionless horizontal table. It's connected to a block with mass m2 by a light cord that passes through a hole in the table, with m2 hanging vertically. What shoul
What is the concentration of H+ ions in a solution of hydrochloric acid that was prepared b diluting 50.0 mL of concentrated (11.6 M) HCl to a final volume of 500mL? Final answer in M units.
There is also a $1,000 fee that is paid to the University for the Right to sell these programs. If Katherine was able to sel1 programs for $5 each, how many would she have to sell in order to break
What is the concentration of ammonia in a solution if 20.0 mL of a 0.1145 M solution of HCl are needed to titrate a 100.0 mL sample of the solution?
A freight train consists of an engine and several identical cars on level ground. Determine whether each of the statements are true or false then explain. A) if the train is moving at a constant spe
Two hypothetical ionic compounds are discovered with the chemical formulas XCl2 and YCl2, where X and Y represent symbols of the imaginary elements. Chemical analysis of the two compounds reveals th
What makes water so different from other small molecules that have a similar mass, such as methane (CH4), carbon monoxide (CO), and hydrogen sulfide (H2S), all gases?
A 200 weather rocket is loaded with 100 of fuel and fired straight up. It accelerates upward at 30m/s^2 for 33s , then runs out of fuel. Ignore any air resistance effects.....what is the rocket's ma
The affinity of a ribosome for a tRNA in the P site is about 50 times higher for a tRNA in the A site. Explain why this promotes translational accuracy.
In a gas mixture, the partial pressures are argon 425 , neon 60 , and nitrogen 125. What is the total pressure exerted by the gas mixture?
A chair of weight 110 N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 45.0 N directed at an angle of 34.0 degrees celsius below the horizonta
A gas sample was collected over water at 25.3 degrees Celsius, The total pressure is determined to be 0.97 atm. What is the partial pressure of the gas that was collected?
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