An unknown compound (A), C10H12O, gave the following proton NMR data: (a) triplet, at 1.0 ppm (3H) (b) quartet, at 2.4 ppm (2H) (c) singlet, at 3.7 ppm (2H) (d) multiplet, at 7.2 ppm (5H) Propose a structure for (A).

The pH of earth's water is controlled by the combination of several equilibria found in water, as well as between water and the atmosphere. This problem considers a model for oceanic water. H2CO3 + CO3 yields 2HCO3 1) Calculate the equilibrium constant for this equilibrium using Ka1 and Ka2 of carbonic acid. 3) Starting from a pure solution of HCO3, how are the concentrations of H2CO3 and CO3 related to each other? 4) Ocean water has an average pH of approx. 8.1. How are the concentrations of H2CO3 and CO3 related to each other in ocean water? 4) Do you think modeling ocean water as a pure dilute bicarbonate ion solution a good model

3a) How many mL of a 1.21 M NaOH solution would contain 0.275 moles of NaOH? ___ mL NaOH solution

3b) How many mL of 12M HCl solution is needed to prepare 775mL of 0.880M HCl by dilution? ___ mL is needed.

3c) Calculate the molarity of a solution made by dissolving 35.2g K2CO3 in enough water to form 275mL of solution. The solution is ____ M.

3d) 10.5mL of 12M HCl solution is diluted to a volume of 122mL. What is the concentration of the resulting solution? ___M

3e) What is the molar concentration of potassium ions (K+) in a 0.33M K2CO3 solution? ____ M

In which one pair does the first species have a higher boiling point than the second?

*** For any one pair, give your reasoning as to which species has the higher boiling point.

A) NH3 and N2

B) SO2(g) and S8(s)

C) HCl and LiF

D) CH4 and CBr4

E) C3H8 and C3H7OH

***The answer is A. NH3 and N2 but PLEASE show your work on you get that THANK YOU!!

Phosphorous acid, H3PO3(aq), is a diprotic oxyacid that is an important compound in industry and agriculture.

Calculate the pH for each of the following points in the titration of 50.0 mL of a 1.5 M H3PO3(aq) with 1.5 M KOH(aq).

pKa1= 1.30

pKa2= 6.70

(a) before addition of any KOH =_____number

(b) after addition of 25.0 mL of KOH = ______number

(c) after addition of 50.0 mL of KOH = ______number

(d) after addition of 75.0 mL of KOH =_______number

(e) after addition of 100.0 mL of KOH=______number

please explain how you got each! thanks so much

What is the pourpose of the cataytic converter that most automobiles use today? Is the catalyst heterogeneous or homogeneous?

According to the ideal gas law, a 1.041 mol sample of carbon dioxide gas in a 1.016 L container at 270.0 K should exert a pressure of 22.70 atm. By what percent does the pressure calculated using the van der Waals' equation differ from the ideal pressure? For CO₂ gas, a = 3.592 L²atm/mol² and b = 4.267×10^-2 L/mol.

%

Hint: % difference = 100×(P _ideal - P_{van der Waals}) / P _ideal

Red # 4

Q3: Calculate the following for light with the same wavelength as the λmax found for an aqueous solution of concentered FD&C blue #2

(a) Color of light absorbed

(b) Frequency

(c) Energy of one photon

Q4: Calculate the following for light with the same wavelength as the λmax found for an aqueous solution of concentered FD&C red #4

a) Color of light absorbed

b) Frequency

c) Energy of one photon

Q5: Base on the answers to the two previous questions. What happens to the following as you go from blue to red in the visible spectrum?

(a) Wavelength

(b) Frequency

(c) Energy of a photon

*****Express answers with an appropriate number of signification figures and proper units and using scientific notation when necessary/ appropriate.

An acetic acid/ sodium acetate buffer solution is also 0.020 M AlCl3. At what minimum pH will Al(OH)3 (s) precipitate form this solution? What ratio of acetate ion to acetic acid concentrations ([C2H3O2-]/[HC2H3O2]) should be maintained to prevent the precipitation of aluminium hydroxide?

Please show work and address all questions

Calculate the probability of finding an electron in a 1s orbital outside of the first Bohr orbit (a0).

Calculate the most probable value of r for an electron in a hydrogen 1s orbital.

Answer the questions –- Print so I can read it in PeN 1) Assume that a solvent having more isopropanol than solvent G was used in the experiment. Predict whether dye A would migrate a smaller or larger distance in this solvent than in solvent F or G. Why?

2) TLC can be used to help identify unknown compounds. Explain how this might be accomplished using the dyes as an example.

3) READ Harris page 604-623 – define the following terms –DO NOT quote from the textbook word from word but paraphrase using your own words to show understanding!!! Definitions should not use/show equations! Expect 1-2 well-crafted sentences for each! STAPLE typed/printed pages NO HANDWRITTEN answers will be accepted for question 3! a. Retention factor b. Resolution c. Diffusion d. Plate e. Plate height f. Longitudinal diffusion g. Adsorption chromatography h. Partition chromatography

Part A The reactant concentration in a zero-order reaction was 9.00×10−2 M after 105 s and 1.00×10−2 M after 325 s . What is the rate constant for this reaction? Express your answer with the appropriate units. k0th =

Part B What was the initial reactant concentration for the reaction described in Part A? Express your answer with the appropriate units. [A]0 =

Part C The reactant concentration in a first-order reaction was 6.70×10−2 M after 25.0 s and 2.20×10−3 M after 85.0 s . What is the rate constant for this reaction? Express your answer with the appropriate units. k1st=

Part D The reactant concentration in a second-order reaction was 0.490 M after 125 s and 7.20×10−2 M after 800 s . What is the rate constant for this reaction? Express your answer with the appropriate units. Include an asterisk to indicate a compound unit with multiplication, for example write a Newton-meter as N*m. k2nd =

Consider the following reaction:
A(g)⇌2B(g)
Find the equilibrium partial pressures of A and B for each of the following different values of Kp . Assume that the initial partial pressure of B in each case is 1.0 atm and that the initial partial pressure of A is 0.0 atm . Make any appropriate simplifying assumptions

Part A Kp= 2.0

Enter your answers numerically separated by a comma. Express your answer using two significant figures

Part B

Kp= 1.8×10⁻⁴

Enter your answers numerically separated by a comma. Express your answer using two significant figures.

Part C

Kp= 1.6×10⁵

Enter your answers numerically separated by a comma. Express your answer using two significant figures.