If acidic H2O2 is mixed with Fe^2+, which reaction occurs: the oxidation of Fe^2+ to Fe^3+ or the reduction of Fe^2+ to Fe? Give the balanced redox reaction for each possibility and explain your reason for selecting the reaction which will occur. Assume standard solution concentrations.

For a) I have:

red: H2O2 + 2H+ + 2e- ---> 2 H2O E=+1.78 V

oxi Fe2+ ----> Fe3+ + e- E=-0.77V

Ecell = 1.01V

I'm stuck on b) but for the explanation I think I understand that the one which is more positive is more thermodynamically favoured, but if I'm wrong on this I'd appreciate a pointer in the right direction.

Suppose you were asked to carry out a crossed-aldol condensation reaction between 4-methylbenzaldehyde and 3,3-dimethylbutanal modelled after an experiment performed with benzaldehyde and acetone, a. what product would you expect to make? Write the equation showing the detailed structures of reactants and products? b. propose a detailed mechanism for this reaction? c. what unwanted by-product might be expected in this experiment? Write the relevant equations with detailed structures? What experimental strategy might you attempt to minimize the formation of this by-product. d. how would your major product react with 2,4-dinitrophenylhydrazine? write an equation to depict the relevant details and describe what is observed visually. e. how would your major product react with molecular bromine in carbon tetrachloride? describe what is observed visually.

Determine the pH during the titration of 35.8 mL of 0.233 M methylamine (CH3NH2 , Kb = 4.2×10-4) by 0.233 M HBr at the following points.

(a) Before the addition of any HBr

(b) After the addition of 13.7 mL of HBr

(c) At the titration midpoint

(d) At the equivalence point

(e) After adding 54.1 mL of HBr

Question 28

MA₂B₂ is a molecule where M is the central atom bonded to 2 atoms of A and 2 atoms of B. The fact that it exists in only one form (no isomers) suggests its geometry is

Select one:

a. octahedral

b. square planar

c. tetrahedral

d. trigonal planar

Question 29

A compound is found to consist of 28.1% sodium, 13.2% boron and 58.7% oxygen. What is its simplest formula?

Select one:

a. NaBO₂

b. NaBO₃

c. Na₂B₄O₇

d. Na₃BO₃

Question 30

What mass of carbon is present in 0.500 mol of phenol (C₆H₅OH)?

Select one:

a. 94 g

b. 47 g

c. 36 g

d. 6 g

Question 31

A 4.000 g sample of an unknown metal, M, was completely burned in excess O₂ to yield 0.02225 mol of the metal oxide, M₂O₃. What is the metal?

Select one:

a. Y

b. Ca

c. Al

d. Sc

Question 32

What is the maximum mass in grams of aluminum chloride that could be obtained from 2.50 mol of barium chloride and excess aluminum sulfate? This is the balanced equation for the reaction: Al₂(SO₄)₃ + 3BaCl₂--> 3BaSO₄ + 2AlCl₃. BaCl₂molar mass is 208.3 g/mol and AlCl₃molar mass is 133.3 g/mol.

Select one:

a. 521 g

b. 334 g

c. 222 g

d. 55.8

Question 33

1.0 x 10^-5 g sample of a compound is known to contain 1.36 x 10¹⁷ molecules. This compound is

Select one:

a. CO₂

b. CH₄

c. NH₃

d. H₂O

The reaction NO2 (g) + NO (g) ⇌ N2O (g) + O2 (g) reached equilibrium at a certain high temperature. Originally, the reaction vessel contained the following initial concentration: [NO2]i = 0.0560 M, [NO]i = 0.294 M, [N2O] = 0.184 M, and [O2] = 0.377 M. The concentration of the NO2, the only colored gas in the mixture, was monitored by following the intensity of the color. At equilibrium, the NO2 concentration had become 0.118 M. What is the value of Kc for this reaction at this temperature?

A beaker with 190 mL of an acetic acid buffer with a pH of 5.00 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 8.00 mL of a 0.490 M HClsolution to the beaker. How much will the pH change? The pKa of acetic acid is 4.760.

A titration is carried out using 20 mL of 0.500 M Formic Acid (1.8 x 10-4) with 0.500 M NaOH. Calculate the pH after 10.0 mL, 20.0 mL, and 30.0 mL of NaOH have been added.

For the following reaction, 29.8 grams of calcium hydroxide are allowed to react with 24.6 grams of hydrochloric acid. calcium hydroxide (aq) + hydrochloric acid (aq) calcium chloride (aq) + water (l) What is the maximum amount of calcium chloride that can be formed? grams What is the FORMULA for the limiting reagent? What amount of the excess reagent remains after the reaction is complete? grams

A 100. ml sample of 0.10 M HCl is mixed with 50. ml of 0.10 M NH₃. What is the resulting pH?

Thank you!

Hi, I'm having trouble with answering these organic chemistry lab questions. Please give full answers in your own words. Thanks in advance

1. Which of the following solvents: acetone, diethly ether, dichloromethane, pentane, THF, form upper layers or lower layers and which are miscible or immiscible with water during an extraction?

2. What is the consequence of only cooling the recrystallization solution to room temperature instead of 0 degrees celsius.

3. What is the consequence of only cooling the recrysyallization solution to quickly?

4. A mixture of carboxylic acid and a phenol can often be seperated by extracting with aqueous sodium bicarbonate and a suitable organic solvent. What difference in cehmical properties of the carboxylic acid and the phenol make this seperation possible?

5. What is the practical advatnage of using dichloromethane over diethly ether for extracting organic compounds from an aqueous solution using a seperatory funnel? What are the advantages and disadvantages of using diethly ether as an extraction solvent?

Draw the Lewis structure for the I−3.

A student dilutes a solution of 0.100 mol of H3PO4 and 0.150 mol of NaOH with water to a volume of 1.00 L but then realizes that the "distilled water" used was in fact dilute hydrochloric acid.

(A) If the pH of the final solution is 6.62, what are the concentrations of H3PO4, H2PO^−4, and HPO^2−4?

(B) How many moles of HCl were inadvertently added to the original solution?

Many Thanks

During exercise, glycogen in both liver and muscle cells can be converted to glucose metabolites for ATP generation the muscles. Do liver glycogen and muscle glycogen supply the same amount of ATP to the muscles? Explain.

1. (a) Balance the two reduction half - reactions shown under basic condi tions: (i) N2-> NH2OH E

Potassium hydroxide is used to precipitate each of the cations from their respective solution. Determine the minimum concentration of KOH required for precipitation to begin in each case.

A) 1.8×10^−2 M CaCl2

B) 2.1×10^−3 M Fe(NO3)2

C)1.8×10^−3 M MgBr2