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Using anamino acid analyzer with the first sample, you are able to determine that the 4 amino acids present in the peptide are methionine, valine, leucine and phenylalanine.
Gasohol is a mixture of 90% gasoline and 10% ethanol,CH3 CH2 OH. Ethanol is considered an enviornmentally friendly fuel additive because it can be made froma renewable source--sugarcane.
Calculate Kf for [Cd(NH3)4]+2 from the following data: A mixture of 10.0 mL of 0.120 M Cd(NO3)2 with 40.0 mL of 0.600 M NH3 produces a permanent precipitate of CdC2O4 (Ksp= 9.0 x 10-8 ) after the ad
The isomerization of cyclopropane follows first order kinetics. Therate constant at 700K is 6.20e-4 min-1, and the half life at 760Kis 29min. Calculate the activation energy for this reaction.
Consider a lithium atom, two of its electrons are in the 1sshell, and the third is in the 2s shell,1- Consider the lithium atom using the Bohr model, Suppose that the two 1s electrons lie completely
Consider the titration of 50.0 ml of a 0.100 M solution of the protonated form of alinine (H2A^+; Ka1 = 4.6 x 10^-3; Ka2 = 2.0 x10^-10) with 0.100 M NaOH. Calculate the ph after the addition of the
Describe how you would prepare an acetic acid/sodium buffer solution having a pH of 4.2. For acetic acid, Ka = 1.8 x 10^5
Explain the difference between adding NaOH in methanol (completely dissolved) and adding straight NaOH to a triglyceride sample? Describe the two different products you would obtain with each metho
An electrolytic cell is constructed that produces solid Pbfrom . If 2.82 A flows for 19 minutes through the cell. How many grams of Pb2+ will be deposited.
100. g of ice at 0° is added to 300.0 g of waterat 60°C. Assuming no transfer of heat to the surroundings, what is the temperature of the liquid water after all the ice has melted?
Hydrogen iodide decomposes according to the equation2HI(g) ? H2(g) + I2(g), for which Kc = 0.0156 at 400ºC. 0.550 mol HI was injected into a 2.00 Lreaction vessel at 400ºC. Calculate the c
In the alkylation of cyclopentanone, better yields are obtained by first reacting cyclopentanone with an equivalent of lithium diisopropylamide in THF and then adding the alkyl halide rather than mi
Assume that core electrons completely shield valence electrons from the full charge of the nucleus, and that valence electrons do notshield one another.
Electron affinities usually become more negative from left to right across a period, but N is an exception. Explain with wordsand an orbital diagram.
The molar heat capacity of a diatomic molecule is 29.1J/K·mol. Assuming the atmosphere contains only nitrogen gasand there is no heat loss, calculate the total heat intake if theat mosphere w
This problem states, "when a 9.55 g sample of solid NaOHdissolves in 100.0 g of water in a coffeecup calorimeter, the temprises from 23.6 to 47.4. Calculate change in H. for the solution process:
What product would you expect to obtain from the mixed Claisen condensation between ethyl acetate and diethyl oxalate? Draw the mechanism.
Organic chemists rely heavily on thespectroscopic methods of IR and NMR. Explain in great detail (thatmeans more than 2 or 3 sentences) why the two methods have to be used in tandem to determine the
Draw a graph for the above titration. Graph the pH of the acid- base mixture vs. the volume of sodium hydroxide added to the acid - label the equivalence point.
Does a high maximum electrostatic potential indicate a strong acid strength? What does a low dipole indicate about acid strength(strong orweak)
Find the chemical formula AND the chemical name for the compounds formed between the following atoms: 2.Oxygen and Potassium and Silicon
In an experiment we determined that the heat of areaction b/w 1.0M NaOH and 1.0M HCl, 50.mL of the sodium hydroxidesolution and 50 mL of hydrochloric acid solution were mixed in a calorimeter.
Assuming that NaCl dissolves completely and forms an ideal solution, what mass of it is needed to lower themelting point of 5.5 kg of ice to -5.0 Celsius?
What mass of NaCl is required to lower the freezing point of 1.75kg of water by 2.5 C? What mass of CaCl2 would berequired to do the same?(Assume ideal Van't Hoff factors).
A solution is prepared by dissolving 20.2 mL of methanol in 100 mL of water. The final volume of the solution is 118 mL. The densities of methanol and water are 0.782 g/mL and 1.00 g/mL, respectivel