1. A hot solution of a particular compound was allowed to cool to room temperature. After waiting a few minutes, it was noticed that the crystallization had not taken place. Discuss two ways to induce crystallization.

2. What properties are necessary and desirable for a solvent in order that it is well suited for recrystallizing a particular organic compound?

3. Assume that 3.0 g of aniline and 4.5 ml of acetic anhydride are used in the preparation of acetanilide. What is the limiting reagent? What is the theoretical yield of acetanilide? What is? the percentage yields if 3.3 g of acetanilide is obtained?

4. The solubility of compound A in ethanol is 0.4 g per 100 ml at 0o C and 5.0 g per 100 ml at 75 o C. What is the minimum amount of solvent needed to recrystallize an 8.0 g sample of compound A? How much would be lost in the recrystallization?

5. Impure acetanilide was dissolved in hot water. The solution was filtered hot and the beaker of solution was immediately placed in an ice-water bath instead being allowed to cool slowly. What will be the result of cooling the solution in this manner?

A buffer contains 0.150M acetic acid and 0.105M in sodium acetate.

a) Calculate the pH of the buffer.

b) What is the volume of 6.0M NaOH must be added to raise the pH of 100.0 mL of the buffer by 1.5 pH units?

c) Calculate the pH when 2.0 mL of 6.0M is added to 100.0 mL to the buffer.

please show work. question is due before 11PM

When a lithium nucleus reacts with a proton according to the reaction 7Li + 1H -> 2 4He, 3.1 x 10^-29 kg of mass converted to energy. Calculate the energy released per mole of Li.

. Carcinogenic nitrosamines are produed from amines such as dimethylamine and nitrous acid according to the following mechanism: HNO 2 + HNO 2 → H 2 O + N 2 O 3 (fast, reversible) (CH 3 ) 2 NH + N 2 O 3 → (CH 3 ) 2 NHNO + + NO 2 - (slow) (CH 3 ) 2 NHNO + + → (CH 3 ) 2 NNO + H + (fast) (b) What is the molecularity of each step?

What are some of the advantages and disadvantages of using an ion trap and a mass analyzer?

If He(g) has an average kinetic energy of 4450 J/mol under certain conditions, what is the root mean square speed of F2(g) molecules under the same conditions?

Write the wavefunctions describing all 4 bonds in methane molecule using the VB theory.

1. Suppose the following reaction takes place: 2A+B+C----->products. The following observations are made: Halving the ]A] halves the rate of reaction, trippling the [B] has no effect f the rate of reaction, and tripling [C] increases the rate of reaction nine-fold. What is the overall order of the reaction?

Please explain in clear details, thank you!

1) Phosgene (carbonyl chloride), COCl2, is an extremely toxic gas that is used in manufacturing certain dyes and plastics. Phosgene can be produced by reacting carbon monoxide and chlorine gas at high temperatures:

CO(g)+Cl2(g)?COCl2(g)

Carbon monoxide and chlorine gas are allowed to react in a sealed vessel at 459?C . At equilibrium, the concentrations were measured and the following results obtained:

Gas	Partial Pressure (atm)
CO	0.880
Cl2	1.18
COCl2	0.200

What is the equilibrium constant, Kp, of this reaction?

2) In Part A, you were given the equilibrium pressures, which could be plugged directly into the formula for K. In Part B however, you will be given initial concentrations and only one equilibrium concentration. You must use this data to find all three equilibrium concentrations before you can apply the formula for K.

Part B

The following reaction was performed in a sealed vessel at 753?C :

H2(g)+I2(g)?2HI(g)

Initially, only H2 and I2 were present at concentrations of [H2]=3.35M and [I2]=2.15M. The equilibrium concentration of I2 is 0.0500M . What is the equilibrium constant, Kc, for the reaction at this temperature?

Express your answer numerically.

Determine the [OH-], [H+], pH, and pOH of each of the following: a. 0.29 M Sr(OH)2 b. A 2.50 L solution prepared by dissolving 15.6 g of KOH in distilled water. c. A 250 ml solution prepared by dissolving 42.1 g of NaOH in distilled water d. A 300 ml solution prepared by dissolving 5.00 g of HI in 300ml of a 0.796 M solution of HNO3?

Which conformer is more stable and by how much?

1)equatorial 2-methylcyclohexanone 2) axial 2-,ethylcyclohexanone

for each conformer, draw out the expected major product (with stereochemistry) for addition of methyl magnesium bromide.

Question 2 options:

For the reaction  CH4 + O2 →CO2 + H2OCH4 + O2 →CO2 + H2O

what are the coefficients for each reactant or product?

a. CH₄

b. O₂

c. CO₂

d. H₂O

Question 3 (2 points)

Question 3 options:

For the reaction  NaOH + AlCl3 →NaCl + Al(OH)3NaOH + AlCl3 →NaCl + Al(OH)

what are the coefficients for each reactant or product?

a. NaOH

b. AlCl₃

c. NaCl

d. Al(OH)₃

Question 4 (2 points)

Question 4 options:

For the reaction  H2O2 →O2 + H2OH2O2 →O2 + H2O

what are the coefficients for each reactant or product?

a. H₂O₂

b. O₂

c. H₂O

Question 5 (2 points)

Question 5 options:

For the reaction  FeSO4 + Na3PO4 →Fe3(PO4)2 + Na2SO4FeSO4 + Na3PO4 →Fe3(PO4) + Na2SO4

what are the coefficients for each reactant or product?

a. FeSO₄

b. Na₃PO₄

c. Fe₃(PO₄)₂

d. Na₂SO₄

Question 6 (2 points)

Question 6 options:

For the reaction  C6H12O6 + O2 →CO2 + H2OC6H12O6 + O2 →CO2 + H2O

what are the coefficients for each reactant or product?

a. C₆H₁₂O₆

b. O₂

c. CO₂

d. H₂O

True or False

1. Zaitzeff's rule is usefull for predicting the regiochemistry of electrophilic addition reaction ?

2. Markovnikov's Rule is usefull for predicting the regiochemstry  of electrophilic addition reaction ?

3. A Alkene bromination reaction is an example of an syn addition ?

4.A Hydroboration-Oxidation reaction is an example of an anti-addition ?

5. Carbocations can combine with a nucleophile, eliminate, or rearrange ?

6. A steroespecfic reaction will prdouce only a certain set stereoisomoers due to the reaction mechanisim. ?

In an experiment like the one you will complete, a student collected the following data. Use this information to complete the questions below. YOU MUST SHOW ALL CALCULATIONS.

Change in Mass of Anode: -0.023 g

Change in Mass of Cathode: +0.019 g

Average Current: 38.7 mA

Time of Electrolysis: 1860 s

d) Using the average of the change in mass of copper from the electrodes in the electrolytic cell, calculate the molar mass of copper.