How would you use a DEPT spectrum and a {¹H}¹³C spectrum to deduce how many quaternary carbon atoms you have?

Write the combustion reaction for uracil (C4H4N2O2 (s)) and calculate the standard enthalpy for the combustion reaction of uracil at 298.15 K, using only the standard formation enthalpies for uracil (s), CO2 (g) and H2O (l), which you will find online.

Use the general integral balance equation to derive an integral balance equation for the concentration, c, of some substance that diffuses through boundaries of the control volume. The substance may also be produced or consumed within the control volume by chemical reactions

(a)Define the surface fluxes and volumetric source/sink and explain your choice

(b)Write out the final form of the integral balance

(c)Explain what additional information or models would be required in order to solve this equation for the volume-averaged concentration, {c}.

Can someone help me with this, not sure how to attempt.

What is the hydroxide-ion concentration in a 0.20 M solution of Na₂CO₃? For carbonic acid, K_a1 = 4.2

draw the structure of LDA and explain 2 reasons why it is well suited to act as a base for the formation of an enolate

Enzyme X is a highly pigmented protein that imparts the characteristic color to certain blue-green algae. It also facilitates a reaction necessary to the survival of this species; we can follow the kinetics of this reaction by measuring the conversion of Substance X to Substance Y at various times during purification.

1. Given a pure preparation of these algae, and the required supplies and equipment, devise and outline an empirical procedure for purifying Enzyme X.

2. What is a good indication of purity in your preparation?

The outline of steps to purify Enzyme X should include detail of what the technique is, why that technique is needed, and what the result will be. The reader needs to have enough information so as to be able to do the experiment. Treat the assignment as one that demonstrates your knowledge of biochemical techniques in protein purification.

As for the length of this assignment, you are describing a protocol; therefore, you need to provide the necessary information for the reader to be able to know how, why, and what, as well as the potential outcomes of the steps and the end result.

Consider the following reaction and associated equilibrium constant:
aA(g)+bB(g)⇌cC(g), Kc = 4.0

Find the equilibrium concentrations of A, B, and C for a=1, b=1, and c=2. Assume that the initial concentrations of A and B are each 1.0 M and that no product is present at the beginning of the reaction.

A chemist prepared a solution by dissolving 52.0 g of hydrated sodium carbonate in water to a total volume of 5.00 dm3. The concentration was determined to be 0.0366 M. Determine the formula of the hydrated sodium carbonate.

Explain the proper techniques for cleaning the NMR tubes. Explain NMR and IR spectroscopy and what can be gained from both individually to analyze an unknown sample. Explain and show work.

Error Analysis Questions:

1. Assuming the magnesium ribbon wasn't sufficiently polished to remove a coating of magnesium oxie on the surface. How would this affect the volume of hydrogen gas produced? Would this error cause the gas constant to be overestimated, underestimated, or remain unaffected? Please explain your reasoning.

2. Assume the water doesn't properly drain from the eudiometer tube therby leaving droplets on the sides of the glass. Would this error cause the gas constant to be overestimated, underestimated, or remain unaffected? Please explain your reasoning.

3. Imagine that as the magnesium reacts with the hydrochloric acid, a small portion of the hydrogen gas generated dissolves in the water. How would this affect the volume of H2 gas measured in the eudiometer tube? Would this error cause the gas constant to be overestimated, underestimated, or remain unaffected? Please explain your reasoning.

4. If the temperature of the hydrogen gas was underestimated, would this error cause the gas constant to be overestimated, underestimated, or remain unaffected? Please explain your reasoning.

Consider the reaction: 2HCl(aq) + Ba(OH)2(aq) ! BaCl2(aq) + 2 H2O(l) deltaH = "118 kJ

A) Calculate the heat produced when 700.0 mL of 0.500 M HCl is mixed with 300.0 mL of 0.500 M Ba(OH)2. Note: One of the solutions is the limiting reagent.

B) Calculate the final temperature if both solutions were initially at 25.0° C, and they were mixed together in a calorimeter with a heat capacity of 180.3 J/C° Note: The density specific heat capacity of the solution are the same as that of water: D = 1.00 g/cm3 and C = 4.184 J /g•°C

Weak diprotic acid H₂A is titrated with 0.2000 M NaOH. The initial concentration of H₂A is 0.1000 M and the initial volume is 50.00 mL.      K_a1 = 1.0 x 10⁻⁵       K_a2 = 1.0 x 10⁻⁹

(a) (0.2 pt) Identify the predominate species at the first equivalence point, by chemical formula:

(b) (0.5 pts) Calculate the pH of the acid solution before any base is added.

(c) (0.5 pts) Calculate the pH at the first equivalence point.

(d) (0.2 pts) How many mL base, total, must be added to achieve the 2nd equivalence point?

(e) (0.5 pts) Calculate the pH at the second equivalence point.

- A 0.171 M weak acid solution has a pH of 4.34. Find Ka for the acid.

- Find the percent ionization of a 0.230 M HC2H3O2 solution. (The value of Ka for HC2H3O2 is 1.8×10−5.)   

- Find the pH of a 0.0221 M solution of hypochlorous acid. (The value of Ka for hypochlorous acid is 2.9×10−8.)

- Find the pH of a 0.012 M solution of HNO2. (The value of Ka for HNO2 is 4.6×10−4.)

- Find the [H3O+] concentration of a 0.307 M  nitrous acid solution. (The value of Ka for nitrous acid is 4.6×10−4.)   

- For each strong base solution, determine [H3O+], [OH−], pH, and pOH.
2.2×10⁻⁴ M KOH and 5.3×10⁻⁴ M Ca(OH)2

- Find the [OH−] of a 0.25 M aniline (C6H5NH2) solution. (The value of Kb for aniline (C6H5NH2) is 3.9×10−10.)

- Find the pH of a 0.25 M aniline (C6H5NH2) solution.

- Determine the [OH−] of a 0.22 M solution of NaHCO3 and determine the pH of this solution..

- Find the pH of a 0.268 M NaF solution. (The Ka of hydrofluoric acid, HF, is 3.5×10−4.)