Contrast ideal vs. nonideal/real gases, and explain why very high pressure and very low temperature gases behave nonideally. (6 points)

Decide the mechanism by which the following alkyl halides will be converted to alcohols by the substitution of the nucleophile, OH-.

The options are: SN1, SN2, more information needed

1-bromo-2,3-dimethylbutane
2-chloro-2,3,3-trimethylbutane
4-iodo-3-ethylhexane
3-chloro-2,2-dimethylbutane

Complete the following table by calculating the missing entries. In each case indicate whether the solution is acidic or basic.

I need help on each row of these.

An ideal monatomic gas at an initial temperature of 500 K is expanded from 5.0 atm to a final pressure of 1.0 atm. Calculate w, q, DU, and (where applicable) DH and DT when the expansion is performed (a) reversibly and isothermally, and (b) reversibly and adiabatically.

Help Please!!!

Dimethyl ether Ch3-o-CH3 and ethanol ch3ch2oh have the same molecular formula. Dimethyl ether evaporates faster than ethanol, which is at same temperature. Explain these observations??

A sample of KIO3 weighting 0.1040 grams was added to an HCl solution containing excess KI. The liberated I2 requried 34.6 mL of Na2S2O3 solution in the titration. calculate the molarity of the thiosulfate solution, using the overall equation ------> KIO3+6HCl+6Na2S2O3------>3S4O62-+I-+3H2O IKIO3:6Na2s2o3

As a chemist for an agricultural products company, you have just developed a new herbicide,"Herbigon," that you think has the potential to kill weeds effectively. A sparingly soluble salt, Herbigon is dissolved in 1 M acetic acid for technical reasons having to do with its production. You have determined that the solubility product Ksp of Herbigon is 9.50×10⁻⁶.

Although the formula of this new chemical is a trade secret, it can be revealed that the formula for Herbigon is X-acetate (XCH3COO, where "X" represents the top-secret cation of the salt). It is this cation that kills weeds. Since it is critical to have Herbigon dissolved (it won't kill weeds as a suspension), you are working on adjusting the pH so Herbigon will be soluble at the concentration needed to kill weeds. What pH must the solution have to yield a solution in which the concentration of X+ is 1.50×10⁻³M ? The pKa of acetic acid is 4.76.

Express your answer numerically. Answer is not 2.46!

1. Calculate the grams of NaCH₃COO required for 150.0 mL of 0.20 M CH₃COOH solution to achieve a pH of 4.40. (Assume no volume change.)  (K_a = 1.8 x 10^-5 )

2. What is the pH of 100.0 mL of buffer consisting of 0.20 M CH₃COOH/0.20 M NaCH₃COOafter 15.0 mL of 0.25 M HCl was added into the solution? (K_a = 1.8 x 10^-5)

3. Are the following solutions reasonable buffers? Please provide an explanation for each answer.

1. 1.0 M H₃PO₄ and 1.0 M NaH₂PO₃
2. 1.0 M H₂SO₄ and 1.0 M HCl
3. 1.0 M NaOH and 0.50 M HCl

An experimental protocol calls for 25.4 mL of a solution in which the potassium ion concentration is 0.0872 M. How would you prepare this solution from pure solid potassium phosphate? (The solvent is water.)

(Please don’t forget to state how you would prepare the solution; don’t simply calculate the grams of potassium phosphate required.)

A chemical equation (even a balanced chemical equation) is not able to tell us how the reaction actually occurs. However, we can predict the rate law of a reaction, if we propose a plausible reaction mechanism. Consider the mechanism proposed for the decomposition reaction A 2 B + C, and understand the rate law from the molecular view.

(a) Derive the possible rate law based on mechanism (I). step 1: A k1 B + X slow step 2: X k2 B + C fast

(b) Derive the possible rate law based on mechanism (II). step 1: A k1 k−1 C + M fast step 2: M k2 2 B slow

(c) Comparing to the rate law in Question 1 (or Question 2), which mechanism is plausible for the decomposition reaction, (I) or (II) ?

For the reaction below, Kp = 29.21 at 800K. Calculate the equilibrium partial pressures of the reactants and products if the initial pressures are Ppcl5 = 0.488atm & Ppcl3 = .4900atm.

PCL5(g) <----> PCL3(g) + Cl2(g)

PCL5: ______ atm

Cl2: _______ atm

PCl3: ______ atm

List the different electron donating compounds that provide energy for the work done by biological organisms?

Question 12.12. The condensation of diatomic bromine (Br2) from a gaseous to a liquid state releases 7.4 kcal/mol. What is the sign of delta H for this process?
Positive
Negative

Where it occurs, write the hydrolysis of the anion/or cation.

1) NH4I

2) CH3COOLi

3) CsCIO4

An unknown Fe(II) sample is added to 2.50 mL of a 0.0300 M potassium dichromate solution (in acidic medium) in a 25 mL volumetric flask. 2 M H2SO4 is added to fill the flask to the calibration mark. After the reaction proceeds to completion, the absorbance of the solution at 447 nm is measured to be 0.550 using a 1.00-cm path length. Calculate the following and enter your answers with correct significant figures. Extinction coefficient of Cr2O72-in 2M sulfuric acid at 447 nm is 350. M-1cm-1

Molarity of Cr2O7 2- in the solution after reaction.

Moles of Cr2O7 2− that reacted.

Moles of Fe(II) that reacted.