What is implied by the term “superaromatic”, as applied to the reactivity of ferrocene toward electrophilic aromatic substitution? How can this be used to explain the fact that no Lewis acid catalyst is required during the Friedel-Crafts acylation of ferrocene?   

Describe how you may synthesize the following block copolymer (PMMA-b-PS)? Please describe the following details: what initiator(s) should be used, and what is its concentration with respect to monomer concentrations (suppose [MMA] = [Styrene] = 1.5 M)? How do you want to add the monomers in the reactor?

Radiation can be used for chemical reactions, principally to break bonds between atoms. From the list below identify the bond with the highest energy that can be broken by a photon of 1.17×1012 kHz frequency.

(a) H-H: 432 kJ/mol

(b) F-F: 159 kJ/mol

(c) H-F: 565 kJ/mol

(d) C-H: 413 kJ/mol

(e) O-H: 467 kJ/mol

If 11.6 kilograms of Al2O3(s), 53.4 kilograms of NaOH(l), and 53.4 kilograms of HF(g) react completely, how many kilograms of cryolite will be produced? What is the total mass of the excess reactants left over after the reaction is complete? Which reactants will be in excess?

19. Which of the following statements is true?

Choose all that apply.

a) Acidic solutions taste bitter.

b) Basic solutions taste bitter.

c) Acidic solutions cause red litmus to change color to blue.

d) Basic solutions cause blue litmus to change color to red.

e) [H₃O⁺] is less than 1.00 x 10^-7 in a basic solution.

f) [OH^-] is less than 1.00 x 10^-7 in a basic solution.

Balance the following redox reactions.

a) As + ClO3- H3AsO3 + HClO Acidic conditions.

b) Br2 BrO3- + Br- Basic conditions.

c) MnO2(s) + Cl-(aq)  Mn2+(aq) + Cl2(g) Acidic conditions

d) N2H4(aq) + Ag2O(s)  N2(g) + Ag(s) Basic conditions

Balance the equation

__ C₈H_10(l) + __ O_2(g)  --> ___ CO_2(g)  + ___ H₂O_(g)

A) 3275 grams ( 1 gallon ) of xylene ( C₈H_10(l)) are chemically combined with oxygen (O_2(g)) in this chemical reaction. Calculate the number of moles present in the 3275 grams of xylene (C₈H_10(l)).

B) If the number of moles C₈H₁₀ calculated in (A) were burned in this combustion reaction, how many moles of oxygen (O_2(g)) would be required to react with the xylene?

C) If the number of moles C₈H₁₀ calculated in (A) were burned in this combustion reaction, how many moles and how many grams of carbon dioxide would be produced in the reaction?

D) If the number of moles of C₈H₁₀ calculated in (A) were burned in this combustion reaction, how many moles and how many grams of water vapor ( H₂O_(g)) would be produced in this reaction?

E) Use the number of moles of carbon dioxide, calculated in part (C), and the Ideal gas law to calculate the volume of carbon dioxide gas produced in this reaction when the carbon dioxide gas is at temperature of 1245.0 degree Celsius and a pressure of 745 mmHg.

For a concentration cell:

Zn/Zn2+ (0.05M)//Zn2+(1M)/Zn

E= 0.035 volt

a. What can you say about the measured emf of this cell and the concentration cell of Cu/Cu2+ (0.05M)//Cu2+(1M)/Cu ?

b. Why is the standard emf (E) not a factor in these two cells?

c. Use the Nernst equation to calculate the emf of this cell.

Calculate the grams of K₂CO₃ required to prepare 510.0 mL of a 0.777 g/L K⁺ solution. [Answer in 4 SF].

The Ksp of PbI2 is 1.4 x 10-8. Calculate the molar solubility of PbI2 in 0.01 M NaI.

1.5 x 10-3 M

1.4 x 10-4 M

1.4 x 10-6 M

5.6 x 10-2 M

8. a. What is the molarity of a solution of calcium chloride which contains 33500 mg of solute in a total volume of 0.352L?

b. What is the molarity of a solution of LiI which contains 26800 mg of solute in a total volume of 0.282L?

c. What is the molarity of a solution of calcium chloride which contains 0.440moles of solute in a total volume of 0.872L?

9. a. How many mL of solvent should be added to 0.99L of a 1.5M solution if you want a final concentration of 0.74M.

b. 0.096L of a 2.9M solution is diluted to a final volume of 250mL. What is the
resultant molarity?
c. How many L of solvent should be added to 0.77L of a 1.0M solution if you want a
final concentration of 0.45M?

I need to identify the cations A through G as K+, Cu2+, Ag+, Ba2+, Fe3+, Mg2+, or Pb2+

The unknown cation is Br-/OH-

From what I believed I've figured out is:

K+ = F

Cu2+ = A or E

Ag+ = B or C

Ba2+ = G

Fe3+ = A or E

Mg2+ = A or E

Pb2+ = D

I believe this may be correct but I am unable to figure out Cu2+, Ag+, Fe3+, and Mg2+. I also need to make sure that they are correct. This lab is very confusing to me so I am trying to figure it out.

	A	B	C	D	E	F	G
Br-	Soluble	Insoluble	Insoluble	Soluble	Soluble	Soluble	Soluble
SO4 2 -	Soluble	Soluble	Soluble	Insoluble	Soluble	Soluble	Insoluble
PO4 3-	Insoluble	Insoluble	Insoluble	Insoluble	Insoluble	Soluble	Insoluble
OH-	Insoluble	Insoluble	Insoluble	Insoluble	Insoluble	Soluble	Soluble
Unknown (Br-/OH)

I need to write a molecular, ionic, and complete ionic equations for each of the reaction that produced a precipitate.

Reaction 1 - 13

For example,

Reaction 1:

Molecular:

Total Ionic:

Net Ionic:

A 2.335 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 5.030 grams of CO2 and 2.060 grams of H2O are produced. In a separate experiment, the molar mass is found to be 102.1 g/mol. Determine the empirical formula and the molecular formula of the organic compound.

Enter the elements in the order C, H, O

empirical formula =

molecular formula =

You have 100ml of 1.0M PIPES buffer at the pH = 5.76. The pKa for PIPES is 6.76. How much 10 M NaOH would you need to add to change the pH from 5.76 to 6.76? Do not concern yourself with dilution effects.

a. 2.0 ml

b. 4.0 ml

c. 8.0 ml

d. 9.8 ml

The answer is B I am just unsure how to arrive there.

A system at equilibrium contains I 2 (g) at a pressure of 0.19 atm and I(g) at a pressure of 0.22 atm . The system is then compressed to half its volume. Part A Find the pressure of I 2 when the system returns to equilibrium. Part B Find the pressure of I when the system returns to equilibrium.