A conductivity cell when standardized with 0.01 M KCl was found to have a resistance of 189 Ω. With 0.01 M ammonia solution the resistance was 2460 Ω. Calculate the bas dissociation constant of ammonia, given the following molar cconductivities at these concentrations: λ(K⁺) = 7305 Ω^-1cm²mol^-1; λ(Cl^-) = 76.4 Ω^-1cm²mol^-1; λ(NH₄⁺) = 73.4 Ω^-1cm²mol^-1; λ(OH^-) = 198.6 Ω^-1cm²mol^-1.

If the student uses 5.00 grams of (CH3)3CCO2H, how many grams of Mo(CO)6 will the student need to react completely with the (CH3)3CCO2H.

A student weighs by difference 0.1956g of sodium oxalate into a 100ml Volumetric flask and dilutes to the mark 10mL of HCI and 90mL of distilled water. The student then pipetted a 25mL aliquot of the ocalate solution to a 125mL Erlenmeyer flask. Approximately how many mL's of 0.02 M KMnO4 would be requied to reach the equivalence point of the trtration?

The balanced alf reactions are:

Reduction: MnO4- + 8H+ + 5e- --> Mn2+ + 4H2O

Oxidation: C2O4 2- ---> 2CO2+ 2e-

Combining (and balancing) the two half reactions yields:

2MnO4 2- + 5 C2O4 2- + 16H+ ---> 2Mn2+ + 10CO2 + 8 H2O

10)Explain briefly what happens when you eat french fries; describe the step by step process of what happens to the glucose units in the starch as they go through the different stages.

Identify the peaks for Raman or Rayleigh on a emission/excitation spectrum for dilute quinine and for dilute sulfuric acid.

spectra are not provided

Explain how the same protein can migrate differently on SDS page

Indicate the concentration of each ion present in the solution formed by mixing

c) 3.60g of KCL in 75.0mL of .250M CaCl2 solution.

You placed 6.35 g of a mixture containing unknown amounts of BaO(s) and MgO(s) in a 3.50-L flask containing CO₂(g) at 30.0°C and 750. torr. The solid BaO and MgO in the flask completely reacted to form BaCO₃(s) and MgCO₃(s), respectively. After the reactions to form BaCO₃(s) and MgCO₃(s) were completed, the pressure of CO₂(g) remaining was 245 torr, still at 30.0°C. Calculate the mass of BaO(s) in the initial mixture. (Assume ideal gas behavior).

What is the van Deemter equation, and how can it be used to improve a separation? Support your answer with a sketch of a typical van Deemter plot, making sure to label your axes.

Find the pH and equilibrium concentrations of all species of a 25 M H₂SO₃ solution at 25 degree C.

Part A

Escherichia coli (E. coli) can under optimal conditions double every 20.0 minutes. How long would it take a single cell to saturate a 5.0 L culture assuming that optimal growth conditions prevaled and that no cells died? The maximum cell denisty in a saturated culture is 10¹⁰ cells mL^-1. Enter your answer to the nearest tenth of an hour.

Part B

Consider the information in Part A and decide how long it would take for the 5.0 L culture to attain 1.0% saturation? Again, enter your answer to the nearest tenth of an hour.

Part C

Imagine that just after the culture described above became saturated a researcher poured the culture into 15.0 L of fresh growth media. How long would it take for this 20.0 L (total volume) cuture to become saturated, again, assuming that optimal conditions prevailed and that no cells died. Enter your answer to the nearest minute.

A chemist studying the reaction C2H4 (g) + I2 (g) ⇌ C2H4I2 (g) places 3.0 mol of C2H4 and 1.0 mol of I2 in a 2.0 L vessel and raises the temperature to 200.0 °C. At equilibrium, the concentration of C2H4I2 is 1.51 × 10-2 M. The chemist then adds 2.0 mol of I2 to the vessel and allows it to reach a new equilibrium. What is the concentration of C2H4I2 at the new equilibrium?

The preparations of two aqueous solutions are described in the table below. For each solution, write the chemical formulas of the major species present at equilibrium. You can leave out water itself.

Write the chemical formulas of the species that will act as acids in the 'acids' row, the formulas of the species that will act as bases in the 'bases' row, and the formulas of the species that will act as neither acids nor bases in the 'other' row.

You will find it useful to keep in mind that

NH3

is a weak base.

Consider the Daniell cell, for which the overall cell reaction is Zn(s)+Cu2+(aq)⇌Zn2+(aq)+Cu(s) The concentrations of CuSO4 and ZnSO4 are 2.20×10⁻³ m and 1.10×10⁻³ m , respectively.

A)

Calculate E setting the activities of the ionic species equal to their molalities.

Express your answer to four significant figures and include the appropriate units.

B)

Calculate γ±,ZnSO4 for the half-cell solutions using the Debye-Huckel limiting law.

Express your answer using three significant figures.

C)

Calculate γ±,CuSO4 for the half-cell solutions using the Debye-Huckel limiting law.

Express your answer using three significant figures.

D)

Calculate E using the mean ionic activity coefficients determined in part (b) and part (c).

Express your answer to four significant figures and include the appropriate units.