The OH radical is important in the daytime chemistry reactions in the formation of air pollutants.(which one is correct?)

A.it is formed from nitrous acid

B. it reacts with hydrocarbons

C. it is formed from hydrogen peroxide

D it is formed from ozone

E. it is formed only in the early morning hours.

The reaction SO2(g)+2H2S(g) ⇌ 3 S(s)+2H2O(g) is the basis of a suggested method for removal of SO2, a pollutant that irritates airways causing coughing, from power-plant stack gases. The values below may be helpful when answering questions about the process.

Question: Using Le Châtelier's principle, determine how the process is affected after each of the following temperature or pressure changes. Consider that a more effective reaction produces more product or more product in a shorter amount of time.

Drag the appropriate items to their respective bins.

a) Temperature increases while maintaining the container size.

b) Pressure increases by decreasing the container size

c) Pressure decreases by increasing the container size.

d) Temperature decreases while maintaining the container size.

place the above under category of More Effective, Less Effective or Equally Effective.

During the metabolism of amino acids, amino groups are often switched from one organic compound to another through a process called transamination. The following are two examples of transamination reactions with their corresponding free energy changes:

glutamate + pyruvate ---> α-ketoglutarate + alanine              ∆G^o' = - 1.00 kJ/mol

glutamate + oxaloacetate ---> α-ketoglutarate + aspartate      ∆G^o' = - 4.81 kJ/mol

Answer the following questions about transamination.

a. Using the two equations given above, write an equation for the net formation of alanine and oxaloacetate from aspartate and pyruvate.

b. Calculate the standard free energy change for this overall reaction and indicate whether it will go spontaneously in the direction indicated.

c. Suppose that under steady state conditions in a cell at 37 ^oC, the actual concentrations of pyruvate and aspartate are 1.2 x 10^-2 M, the concentration of alanine is 1.5 x 10^-4 M, and the concentration of oxaloacetate is 1.9 x 10^-5 M. Using the equation that ∆G = ∆G^o' + RT ln [products]/[reactants] and the gas constant of R = 8.315 J/mol K, calculate the actual free energy change and determine if the reaction is spontaneous

1. Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to standardize strong base solutions. It has the unwieldy formula of KHC₈H₄O₄. This is often written in shorthand notation as KHP.

How many grams of KHP are needed to exactly neutralize 23.2 mL of a 0.557 M potassium hydroxide solution ?

2. Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to standardize strong base solutions. It has the unwieldy formula of KHC₈H₄O₄. This is often written in shorthand notation as KHP.

What volume of a 0.458 M potassium hydroxide solution is needed to exactly neutralize 2.67 grams of KHP ?

3. A student is asked to standardize a solution of barium hydroxide. He weighs out 1.04 g potassium hydrogen phthalate (KHC₈H₄O₄, treat this as a monoprotic acid).

It requires 37.9 mL of barium hydroxide to reach the endpoint.

A. What is the molarity of the barium hydroxide solution?

This barium hydroxide solution is then used to titrate an unknown solution of hydrobromic acid.

B. If 21.7 mL of the barium hydroxide solution is required to neutralize 13.0 mL of hydrobromic acid, what is the molarity of the hydrobromic acid solution?

4. A student is asked to standardize a solution of calcium hydroxide. He weighs out 1.04 g potassium hydrogen phthalate (KHC₈H₄O₄, treat this as a monoprotic acid).

It requires 32.9 mL of calcium hydroxide to reach the endpoint.

A. What is the molarity of the calcium hydroxide solution?  M

This calcium hydroxide solution is then used to titrate an unknown solution of hydroiodic acid.

B. If 16.2 mL of the calcium hydroxide solution is required to neutralize 20.4 mL of hydroiodic acid, what is the molarity of the hydroiodic acid solution?  M

(a) Calculate the percent ionization of 0.00710 M butanoic acid (Ka = 1.5e-05). % ionization = % (b) Calculate the percent ionization of 0.00710 M butanoic acid in a solution containing 0.0210 M sodium butanoate. % ionization = %

1. If 14.95 mL of a 0.1250 M HCl solution is added to reach the endpoint of a titration, how many moles of HCl have been added?

QUESTION 2

A buret is read to how many decimal places?

QUESTION 3

As the endpoint nears what happens to the color?

QUESTION 4

A 20.00 mL sample of 0.1015 M nitric acid is introduced into a flask, and water is added until the volume of the solution reaches 250. mL. What is the concentration of nitric acid in the final solution?

QUESTION 5

If 25.0 mL of an unknown concentration of sodium hydroxide is added to a flask and then titrated with 0.1025 M HCl. If 24.69 mL of the acid was added, what is the concentration of sodium hydroxide?

For toluene determine:
a) Vapor pressure at 100 ° C.
b) Its boiling temperature at a pressure of 530 torr.
c) Draw the liquid-vapor equilibrium curve from 13 to 136 ° C.

Consider the titration of 39.2 mL of 0.260 M HF with 0.215 M NaOH. Calculate the pH at each of the following points.

A. Calculate the pH after the addition of 9.80 mL of base

B.Calculate the pH at halfway to the equivalence point.

C. Calculate the pH at the equivalence point.

Why does krypton form crystals at sufficiently low temperatures despite having no
permanent dipole moments?

Explain tactility using poly(acrylonitrile) as an example.

A solution is 5 mM in each of the following ions:

Indicate which of the metal ions would precipitate (or start to precipitate) at each of the following pH values. Indicate your answer with the number of the ion. Use 0 to indicate no precipitate. If more than one precipitate is expected, list the numbers in increasing order and separate them with commas. For example, 3,4,5 is ok but 5,4,3 is not.

pH = 5.00:

pH = 9.00:

What is the pH to the nearest 0.1 pH unit at which Mg(OH)₂ begins to precipitate?

pH =

An air bottle used for scuba diving breathing apparatus has a volume of 30 l. After it has been used, the pressure and temperature of the remaining air in the bottle are 0.3 MPa and 24 ◦C. Before the apparatus is used again, it is charged with air at temperature of 50 ◦C until the pressure in the bottle reaches 6 MPa. The charging processes is fast, and can be assumed to be adiabatic.

Questions: (a) Calculate the mass of air to be added to the bottle.

(b) What is the temperature of the air in the bottle at the end of the charging process?

1.687 g of N-2-acetamido-2-aminoethane-sulfonic acid potassium salt (ACES–K , MW = 220.29 g/mol) is dissolved in 90.76 mL of water. 15.18 mL of HCl is added to the solution, resulting in a pH of 7.25. Calculate the concentration of the HCl solution. The pKa of ACES is 6.85.

We ran a recrystallization experiment in lab, ultimtely I know recrystallization is used for purification purposes, but this question is confusing me.

What affect did recrystallization have upon the yield of product, the appearance of the product, and its melting point? yield and MP confuse me. I wasnt given the resources to check the MP during lab so is there a generalized consenssus of wha

I know you wont be able to tell me about appearance, I have that potion but the yield and MP portion I was wondering if there is some generalized assumption I am missing for recrystalllized products? I was not given the rousources to measure the MP during lab so I assume there is a trend I am missing from recrystallization - like raising the MP because it is a purer substance.