The pH change around the equivalence point for strong-base/weak-acid titration is usually not as great as that for strong-base/strong-acid. The statement is true or not. Explain.

What is the percent yield of dibenzalacetone when 0.212 g of benzaldehyde and 0.058 g of acetone was used in the experiment? I got a 0.885 g of product in the end.

Show an organic reaction mechanism which relies on bond polarity in order to occur. How does electronegativity participate in this reaction.

The equilibrium vapor pressure of mercury at room temperature is about 1.6x10-6 atm. Imagine an old chemistry lab that over the years has experienced enough liquid mercury spills and thereby accumulated enough mercury in cracks in the floor, etc. that mercury liquid-vapor equilibrium has been established. What is the concentration, in the units of milligrams per cubic meter, of Hg0 in the air of the room? Does this value exceed the limit of 0.05 mg m-3 established by the American Conference of Governmental Industrial Hygienists (ACGIH) for safe exposure based upon a 40-hour work week?

Consider the titration of a 26.0-mL sample of 0.180 M CH3NH2 with 0.145 M HBr. (The value of Kb for CH3NH2 is 4.4×10−4.)

Already found:

volume of added acid required to reach the equivalence point.=32.3 ml

pH at 6.0 mL of added acid=11.28

pH at one-half of the equivalence point.= 10.64

Part A

Determine the initial pH

Part B

Determine the pH at the equivalence point.

Part C

Determine the pH after adding 5.0 mL of acid beyond the equivalence point.

For each of the following pairs of molecules, identify the dominate intermolecular force, and answer any associated questions.

a. KNO2, CH3NO2

Which compound do you expect to have the highest melting point?

b. CH3CH2OH, CH3OCH3

Which compound do you expect to have the highest boiling point?

c. KF, BrF

Which compound do you expect to have the greatest vapor pressure?

List the dominant IMF for each molecule:

d. NH3, N2

e. CF4, CCl4

f. HCN, KCN

g. LiCl, CH3CH3

h. CH3OH, CH3F

Please explain each step.

• Draw products for the following addition reactions:
  • Hydrogenation (H₂ / Pt)
  • Halogenation (X₂)
  • Hydrohalogenation (HX)
  • Hydration (H₂O, H⁺)

1a. What happens to the pressure of an ideal gas if you double its temperature in a closed volume? And what happens to the pressure of an ideal gas if you double its volume at a fixed temperature?Please explain your answer using the combine gas law.

1b. Based upon the standard molar volume, what volume would 0.500 moles of an ideal gas occupy at STP? And based upon the standard molar volume, what volume would be occupied by 1.00 mol of an ideal gas at a temperature of 819.45 K and a pressure of 760.0 mmHg?Please explain your answer.

Walter White who lives in Simeranya (a utopic city in Anarres) prepares blue crystals, named as m...

Walter White who lives in Simeranya (a utopic city in Anarres) prepares blue crystals, named as myth, which adopt a side-centered cubic (scc). In this scc cell, atoms occupy all the edge centers. 1. Determine the number of atoms per unit cell. 2. Calculate the atomic packing factor (APF) of scc unit cell. 3. Determine the coordination number. 4. Draw the atomic arrangements for the following the crystallographic planes; (222), (111), and (002). 5. Determine the coordination number of the largest interstitial hole in this unit cell. 6. Assume that an atom that is 1.2 times larger than the original atom fills in the hole mentioned in Q5. Calculate the APF of this unit cell. Units: NA= 6.02×1023 atoms/mol

please, answer all my questions. This is the third time I sent these questions to Chegg.

Which of the following produces the most stable carbocation?

allyl bromide

2-bromo-2-methylpropane

bromobenzene

benzyl bromide

Photochemical isomerization of Alkene: cis-1,2-dibenzoylethylene

6-38: What are some clues that tell you that you have made a different isomer product in this reaction?

6-39: Suggest a reason why the starting material (trans-1,4-diphenyl-2-butene-1,4-dione) should be recrystallized(or pure) prior to use ( NOTE: you did not perform the recrystallization, but were provided with the recrystallized material).

6-40:Cis-and trans-1,4-diphenyl-2-butene-1,4-dione are stereoisomers. What is the specific relationsip between the two of them?

6-41:Explain how this photochemical isomerizartion allows the production of the thermodynamically less stable cis isomer. In other words, why is the trans isomer exclusively converted to the cis isomer during short reaction periods and not vice versa? is it possible, under these conditions, that the trans and cis isomers are in rquilibrium with one another?

Q1) The interior lighting of refrigerator is provided by incandescent lamps whose switches are actuated by the opening of the refrigerator door. Consider a refrigerator whose 50 W light bulb remains switched on continuously as a result of malfunction of the switch. If the refrigerator has a coefficient of performance of 1.25 and the cost of electricity is 9 pence per kWh, determine the increase in the energy consumption of the refrigerator and its cost per year (365 days) if the switch is not fixed. You may assume that the refrigerator is opened 30 times per day for an average of 20 seconds on each occasion.

Consider the titration of 80.0 mL of 0.0200 M C5H5N (a weak base; Kb = 1.70e-09) with 0.100 M HNO3.

Calculate the pH after the following volumes of titrant have been added:

(a) 0.0 mL pH =

(b) 4.0 mL pH =

(c) 8.0 mL pH =

(d) 12.0 mL pH =

(e) 16.0 mL pH =

(f) 25.6 mL pH =

PART TWO:

A buffer solution contains 0.14 mol of ascorbic acid (HC₆H₇O₆) and 0.84 mol of sodium ascorbate (NaC₆H₇O₆) in 2.80 L.
The K_a of ascorbic acid (HC₆H₇O₆) is K_a = 8e-05.



(a) What is the pH of this buffer?

pH =  


(b) What is the pH of the buffer after the addition of 0.07 mol of NaOH? (assume no volume change)

pH =  


(c) What is the pH of the original buffer after the addition of 0.21 mol of HI? (assume no volume change)

pH =