Which of the following redox reactions do you expect to occur spontaneously in the reverse direction? (Hint: The reactions are occurring under standard conditions (1 M for the aqueous ions).)

Check all that apply.

Calculate the pH for the titration of 40.00ml of 0.1000M solution of ethylamine (C2H5NH2) with 0.1000M HCl for the following volumes of added HCl: Kb for ethylamine = 6.4X10-4

Volumes; 0.00ml; 20.00ml; 40.00ml and 50.00ml

Fundamentals Of Analytical Chemistry 9th Edition - Skoog

Balance the net ionic equation of the following redox reaction using half-reaction method. Show the steps.

Cr(OH)₃ + ClO₃^- --------> CrO₄^2- + Cl^- (basic medium)

Define the equivalence point of an acid-base titration. Describe it for a weak acid-strong base titration (will the pH be >,<, or = 7).

Enter your answer in the provided box.

At a certain temperature and total pressure of 1.2 atm, the partial pressures of an equilibrium mixture for: 2A (g) <---> B (g))

are Pa = 0.60 atm and Pb= 0.60 atm. After a disturbance, the system regains the equilibrium with a total pressure of 1.7 atm. What is the partial pressure of A at the new equilibrium?

=_____ atm

The chemical transformation and its effect on compound solubility form the basis of Acid and base extraction experiment and the general technique of acid separations by solvent extraction.

a) Comment on the relative solubilities of the organic reactant and product in the diethyl ether

phase vs the aqueous phase.

b) Explain why the solubility properties of the organic starting material change upon

conversion to the product. Please be specific in your explanation (hint: your explanation

should focus on polarity and intermolecular forces).

A 1.90 mol sample of N₂ gas is confined in a 45.9 liter container at 21.5 °C.

If the amount of gas is decreased to 0.950 mol, holding the volume and temperature constant, the pressure will decreasebecause:

Choose all that apply.

With fewer molecules in the container, the molecules have lower average speeds.

With fewer molecules per unit volume, the molecules hit the walls of the container less often.

With lower average speeds, on average the molecules hit the walls of the container with less force.

As the average speed increases, the number of molecule-wall collisions decreases.

None of the Above

A 1.52 mol sample of Xe gas is confined in a 37.8 liter container at 29.7 °C.

If 1.52 mol of He gas is added holding the volume and temperature constant, the average molecular speed of the total system will

not enough information to answer the question

remain the same

decrease

increase

A mixture of methane and carbon dioxide gases, at a total pressure of 950 mm Hg, contains 3.04 grams of methane and5.24 grams of carbon dioxide. What is the partial pressure of each gas in the mixture?

P_CH4 =  mm Hg
P_CO2 =  mm Hg

A mixture of carbon dioxide and xenon gases contains carbon dioxide at a partial pressure of 428 mm Hg and xenon at a partial pressure of 560 mm Hg. What is the mole fraction of each gas in the mixture?

X_CO2 =
X_Xe =

A mixture of methane and carbon dioxide gases, in a 6.92 L flask at 69 °C, contains 4.57 grams of methane and 7.87grams of carbon dioxide. The partial pressure of carbon dioxide in the flask is  atm and the total pressure in the flask is  atm.

A mixture of carbon dioxide and xenon gases is maintained in a 8.28 L flask at a pressure of 4.00 atm and a temperature of 65 °C. If the gas mixture contains 22.8 grams of carbon dioxide, the number of grams of xenon in the mixture is  g.

Barium has a density of 3.59 g/cm3 and crystallizes with the body-centered cubic unit cell. Calculate the radius of the barium ion.

You want to determine the concentration of Fe2+in a solution. You decide to determine the Fe2+ concentration by means of a redox titration with potassium permanganate. You use 50 mL of the Fe2+ solution and adjust the pH to 1. You need 26.78 mL of a 0.0179 M KMnO4solution to reach the endpoint.

a. What is the reaction that takes place? Write the balanced chemical equation.

b. What is the concentration of Fe2+ in your original solution?

c. What is the balanced chemical equation for the titration of Fe2+with potassium dichromate? What volume of potassium dichromate (c=0.0148 M) would you have needed for this titration (the pH is acidic)?

d. Provide at least two methods to determine the endpoint of the titration with permanganate. Explain exactly how you would determine the endpoint. Do not just state the method

Part A. Plank‘s constant Plank‘s constant has units of Joules times second (Js). (a)Perform a dimensional analysis and show that these are the same units used to measure angular momentum. (b) Provide the definition of the angular momentum. (c) Explain how the Plank‘s constant can be measured from photoelectric effect.

Part B. Photoelectric effect (a) What is the maximum number of electrons that can be emitted if a potassium surface is irradiated with light of wavelength 275 nm and absorbs 7.75 mJ, while the threshold wavelength for potassium metal is detected of 564 nm. (b) Find the speed of electrons ejected from this surface upon 275 nm radiation. (c) Express the work function of potassium in e

3. Mechanism of carbocation Rearrangements (hydride shift and methyl shift).

Can you please explain

what you need to understand to do the mechanism

what possible reagents could be used

An example (how do you know that this is the mechanism you will use?)

Any tips/ tricks/videos to understanding this mechanism

The objective of this experiment is to identify real world applications of quantum mechanics. Write a paper with a minimum of 1200 words discussing real world applications of quantum mechanics.

Part A

The pressure inside a hydrogen-filled container was 2.10 atm at 21 ?C. What would the pressure be if the container was heated to 93?C ?