If 0.30 M HCOOH (weak acid) is prepared, what will be the hydronium ion concentration at equilibrium at 25

1. Z-2-chlorocyclopentanol and E-2-chlorocyclopentanol each react with NaOH to eliminate HCl but they give different final products C5H8O. Show how each forms

2. The reactions of bromotrichloromethane with toluene in the presence of a peroxide affords trichloromethane and benzyl bromide. Show the mechanism, indicating the chain carrying and initiating steps

3.

Show how to convert 2-hydroxypropane to 1-hydroxypropane:

(a) Using BH3 at some point

(b) Not using BH3

4.

Show the products of the reaction of Br2 with cis-2-butnene (Z) and with trans-2-butene (E). Show and them any enantiomers formed.

(a) in pentane (b) in water, forming bromoalcohols

The three-dimensional structure of the potassium channel provided a rationale for the selectivity of potassium ions and the rejection of sodium ions. Which of the following is the basis for the ability of the potassium channel to discriminate between these two ions?

The sodium ion is too small to pass through the channel.

The opening of the channel is structurally arranged such that potassium ions can bind, but is too small for sodium ions.

A restriction in the channel allows for potassium ions to be resolvated by protein ligands but is too large to effectively resolvate sodium ions.

The restriction of the channel desolvates sodium ions but not potassium ions.

Which of the following contain a coordinate covalent bond?

Check all that apply.

Check all that apply.

Using a 0.20 M phosphate buffer with a pH of 7.4, you add 0.71 mL of 0.54 M HCl to 59 mL of the buffer. What is the new pH of the solution? (Enter your answer to three significant figures.)

Using a 0.20 M phosphate buffer with a pH of 7.4, you add 0.71 mL of 0.54 M NaOH to 59 mL of the buffer. What is the new pH of the solution (Enter your answer to three significant figures.)

Ammonia, NH3, is a weak base with a Kb value of 1.8×10−5.

Part A

What is the pH of a 0.270 M ammonia solution?

Part B

What is the percent ionization of ammonia at this concentration?

1, Why use ninhydrin reagent and iodine crystals as visualizing agent in TLC?

2. Differentiate TLC and Column Chromatography based on a) separation of components in mobile and stationary phases b) solvent mitigation c) type of support used

A manufacturing facility requires saturated steam at 120°C at a rate of 1.2 kg/min. Design an electric steam boiler for this purpose under these constraints: • The boiler will be in cylindrical shape with a height-to diameter ratio of 1.5. The boiler can be horizontal or vertical. • A commercially available plug-in type electrical heating element made of mechanically polished stainless steel will be used. The diameter of the heater can be between 0.5 cm and 3 cm. Also, the heat flux at the surface of the heater cannot exceed 150 kW/m². • Half of the volume of the boiler should be occupied by steam, and the boiler should be large enough to hold enough water for a 2-h supply of steam. Also, the boiler will be well-insulated. You are to specify these: (1) The height and inner diameter of the tank; (2) the length, diameter, power rating, and surface temperature of the electric heating element; and (3) the maximum rate of steam production during short periods (less than 30 min) of overload conditions, and how it can be accomplished

A. draw all the possible stereoisomers for 1-bromo-1,4-dimethylcyclohexane and identify the relationship of the pairs of isomers to each other.

B. 1-bromo-1,4-dimethylcyclohexane reacts with methanol (CH3OH). Show the mechanism and products. Show stereochemistry of the products (if any). What is major product produced. Explain answer.

Using a 0.20 M phosphate buffer with a pH of 7.6, you add 0.76 mL of 0.45 M NaOH to 47 mL of the buffer. What is the new pH of the solution? (Enter your answer to three significant figures.)

A buffer is prepared by mixing 4.00g of sodium acetate (NaC₂H₃O₂.3H₂O) and 10.00mL 3.0M acetic acid. K_a = 1.8x10^-5 for acetic acid.

a) Calculate the pH of the buffer.

b) If we add 5.00mL of 1.0M HCl to 25mL of the buffer, what is the new pH of the buffer?

SHOW STEPS

Taken Organic Chemistry Second Edition! We are in the third week, and I need a conclusion of of the report.

We are testing Aspirin Products

we used buffered aspirin, 10% of NaOH, 1% FeCl3

Can I get a conclusion of the report. Need this as soon as possible.

Part A

How much heat energy, in kilojoules, is required to convert 42.0 g of ice at − 18.0 ∘C to water at 25.0 ∘C ?

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

Part B

How long would it take for 1.50 mol of water at 100.0 ∘C to be converted completely into steam if heat were added at a constant rate of 23.0 J/s ?

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

Dumas Method Experiment:

In this experiment, we measured a flask with an aluminum foil and elastic band set up then added 4mL of methanol inside the flask and sealed with the foil covering and boiled in a water bath until all the liquid vaporized (this will drive out any air in the flask and push out all excess vapour). Then we cooled it to let the vapour condense and reweighed the flask with the vapour in it. The following questions pertain to the experiment:

For each of the following experimental conditions determine whether the calculated value for molar mass would be: A) too high B) Too low C) Unaffected. In each case, explain how this result occurs.

a) After removing he flask from the water bath, the experimenter cools the flask to room temperature but does not dry it. The calculated molar mass will be: A) too high B) Too low C) Unaffected. Explain.

b) The flask is removed from the water bath containing vapour only, the experimenter cools the flask to room temperature and some vapour condenses inside the flask. The calculated molar mass will be:  A) too high B) Too low C) Unaffected. Explain.

c) The flask volume is not measured; instead the experimenter assumes the flask volume to be exactly 125.0 mL. The calculated molar mass will be:  A) too high B) Too low C) Unaffected. Explain.

d) From the time the mass of the unused flask assembly (flask, foil and elastic band) is recorded the flask is handled several times with oily fingers. The calculated molar mass will be A) too high B) Too low C) Unaffected. Explain.