Hi,

I have some Organic Chemistry lab questions that I'm stuck on. Please explain in complete sentences

Thanks in advance

1. Describe the likely cuase and a reasonable solution for each problem encountered:

A. After spotting and developing a TLC plate, no spots are observed.

B. After spotting and developing a TLC plate, all spots moved along with the solvent front.

C. After spotting and develping a TLC plate, all spots are observed at the starting line.

2. What conclusion is justified if two substances rise at different rates on the same plate in the same solvent? What conclusion is justified if the two substances rise at the same level.

3. How can the R_F value be adjusted?

Peak intensity from a mass spectrum gives you what information about a compound?

-The relative abundance of each ion proportional to the most intense (base) peak

-The mass of each fragment

-The total number of atoms present in each fragment

-The number of different isotopic forms present

-None of the answers shown are correct

When speaking of a chemical reaction, what is a transition state?

-It is the lowest energy form of a product from an exothermic reaction

-It is the conversion of a substance from one physical state to another

-It is the difference in energy between a reactant to a product

-It is a temporary, unstable, but high energy form of a molecule with partial bonds

1. Balance the following oxidation-reduction reactions using the half-reaction method and tell the number of electrons transferred in the balanced oxidation-reduction reaction

a) S^2-(aq) + NO₃^-(aq) ---> S₈(s) + NO₂(g) acidic solution

b) MnO₄^-(aq) + I^-(aq) ---> MnO₂(s) + IO₃^-(aq) basic solution

c) Sb(s) + H₂SO₄(aq) ---> Sb₂(SO₄)₃(s) + SO₂(g) acidic solution

d) H₂O₂(aq) + MnO₄^-(aq) ---> MnO₂(s) + O₂(g) basic solution

Calculate the pH at 25°C of a 0.73M solution of potassium cyanide KCN . Note that hydrocyanic acid HCN is a weak acid with a pKa of 9.21 .

Based on gas chromatography results, predict the approximate retention times that probably would be obtained for the following compounds, and explain your predictions. (Compare the boiling points and intermolecular forces for each compound.)
3-Methyl-2-butanone (CAS Reg. No. 563-80-4)

What is the molar solubility of iron(III) hydroxide (Ksp = 2.5 x 10^-39) in water at 25

In a constant-pressure calorimeter, 60.0 mL of 0.320 M Ba(OH)2 was added to 60.0 mL of 0.640 M HCl. The reaction caused the temperature of the solution to rise from 21.70 °C to 26.06 °C. If the solution has the same density and specific heat as water (1.00 g/mL and 4.184 J/g·K, respectively), what is ΔH for this reaction (per mole of H2O produced)? Assume that the total volume is the sum of the individual volumes.

An aqueous solution contains a mixture of .175 M HF (K_a = 7.2 x 10^-4) and .250 M HNO₂ (K_a = 4.0 x 10^-4). Calculate the pH of this solution (express your pH to the hundredth position).

How does adding a solute to a pure solvent change the freezing point? Does it increase or decrease and why does it do this? Is the change in the freezing point of the solution related to the concentration of the solute (in molality)? What are some applications of this concept and how can they be explained?

Be able to state the purpose of the glycerol 3-phosphate and malate-aspartate shuttles. Be able to state why the glycerol 3-phosphate shuttle is considered to less efficient than the malate-aspartate shuttle in promoting ATP production?

balance the following equation, and identify the oxidizing and reducing agents.Express your answer as a chemical equation. Identify all of the phases in your answer.

MnO-4(aq)+CH3OH(aq)=-Mn2+(aq)+HCO2H(aq) (acidic solution)

write the reaction that is happening in the hydrogen generator in symbols, including all states and balance (used zinc, HCl, and H20)

Write the reaction that is happening in the oxygen generator in symbols, including all states and balance. (used magnesium, hydrogen peroxide and water) Thank you!