Chemistry Questions and Answers April 05, 2020

The synthesis of benzoin proceeds as follows: Benzoin condensation 1. Draw the reaction mechanism step by step using curved arrows to indicate the movement of electrons. 2. Make a theoretical explanation of what happens at each step of the reaction

2 H NaCN, HO OH

Lysozyme is the enzyme cleaving peptidoglycan(copolymer of N-acetylglucosamine(GlcNAc) and N-acetylmuramic acid(Mur2Ac)) polymer with Beta(14) linkage. Its active site has two key carboxylated amino acid residues such as glutamate(E) and Aspartate(D). Assuming the reaction starts from glutamate, there are two reaction mechanisms, i.e. SN1 and SN2

What changes should be done to improve HPLC resolution? (more than one answer is correct) a) In column dimension; b) in the column particle (sorbent) size; c) in the polarity of the mobile phase; d) in the mixture molecule size; e) detection mode; f) in temperature

The Proton-1H NMR spectrum for 2,3 diphenylquinoxaline is the following: 1. Explain the chemical shift of each signal that appears in the spectrum. ( explain the electron environment of all carbons ) 2. Explain integration and multiplicity of each signal that appears in the spectrum. 3. Explain the symmetry / equivalence (if applicable) of each

8. 7 5 4. 3 2 ppm

Three samples of crystalline materials are available: sample A, B, and C. All of them are melted exactly at 82 degrees Celsius. Combine a mixture of sample A and B and melt at 82-degree Celsius. Next, combine a mixture of sample A and sample C and melt at 64-degree Celsius. Finally. Combine a mixture of sample B and sample C and melt at 71-degree

The phase diagram for the system Nitrobenzene/Hexane at 1atm is shown in the figure below. A mixture of 50 g of hexane and 150 g nitrobenzene was prepared at 273K. What are the compositions of the phases, and in what proportions do they occur (lever rule)?

Lab: Ketal formation of meso-hydrobenzoin Please write a paragraph for: [ ] Background [ ] protection-desired reaction-deprotection technique: - Protection: to remove reactivity of undesired FG) - Deprotection: to regenerate FG)

Which one has greater extent of back bonding O(SiH3)2 or OCl2? Also, explain d-orbital resonance in OCl2 molecule.

Determine IR functional groups for 2,3-Diphenylquinoxaline from the following theoretical spectra: 1. Explain your answers and label the bands of all functional groups 2. Taking into account that the product ( 2,3-Diphenylquinoxaline ) is obtained by means of the following synthesis, what possible interferences or impurities can be identified in

LOD TRANSHETTANCEISI D 4000 3000 2000 m HAVENUMBERI 1500 1000 5 DO,NH NH pTSA Etanol N HO

Determine IR functional groups for 2,3-Diphenylquinoxaline from the following theoretical spectra: 1. Explain your answers and label the bands of all functional groups

LOD TRANSHETTANCEISI D 4000 3000 2000 m HAVENUMBERI 1500 1000 5 DO

At what pH would 95 percent of the ammonia be present as gas? Acid ionization (dissociation) constant at 25 o C = 5.62*10 -10 .

In this exercise, molecular model kits will be used to give the student a better visual understanding of the three-dimensional nature and spatial relationships that occur in organic molecules. These ball and stick models are not accurate scale representations of the atom sizes and bond distances. They do, however, represent correct bond angles,

a. Construct a model for CH, (methane) by adding a ball representing hydrogen to each of the four bonds of your carbon model. Draw the full structural formula represented by this model. b. Remove one of the hydrogen atoms from your methane model and replace it with a chlorine atom. ibis is chloro methane. Draw the full structural formula. c. Make

The synthesis of 2,3-DiphenylQuinaxine proceeds as follows: 1. Draw the reaction mechanism step by step using curved arrows to indicate the movement of electrons. 2. Make a theoretical explanation of what happens at each step of the reaction

NH NH pTSA Etanol N HO

Potassium hydroxide is used to precipitate each of the cations from their respective solution. Determine the minimum concentration of KOHrequired for precipitation to begin in each case. 1) 2.0102 M CaCl2 2) 2.0103 M Fe(NO3)2 3) 1.510 3 M MgBr2

You made your standards, and when you measured them on the UVVisible Spectrophotometer produced the following data The first standard solution has an absorbance of 0.8763 The second standard solution has an absorbance of 0.8823 The first unknown solution has an absorbance of 0.4251 The second unknown solution has an absorbance of 0.4247 Produce

State a cancer subtype that has no effective treatment yet; propose a therapeutic target for this subtype of cancer and propose a class of chemical compounds that may potentially act on this target and explain why.

9. The standard molar enthalpy of formation of hydrogen chloride, HCI(g), is 92.31 kJmol. Write the thermochemical equation r the reaction for which AHP rxn 92.31 kJmol rxn. (calculation should contain numbers and units)

Q2 A biogas plant has been proposed to setup for 25 workers staying in a village near Alwadi. Each person needs 528 liters of biogas for cooking. If the retention period is 46 days, what capacity of the digester should be designed How much biogas will be generated per day How much energy does the plant generates in a year How many cattle are

55. The concentration of phosphate in a solution saturated with silver phosphate is found to be 1.607 x 105 M. What is the Kp of silver phosphate A) 1.80 x 10 M B) 6.43 x 10M 18 5 C) 2.58 x 10 M D) 3.21 x 10 M

The Saturation Yield for McLeanium as a function of proton energy is below. Assuming your cyclotron accelerates protons to 24 MeV and you construct a thick target (all protons stop in the target material), and you bombard at 35 A for 75 minutes. How much McLeanium (Activity in Bq and mCi) will you make? The halflife of McLeanium is 45 minutes.

What phenomena give rise to the complicated splitting patterns in the aromatic region of the 1H NMR spectrum of the product? This NMR spectrum is from a Diels Alder reaction. The reactants were anthracene (.22 mmol), maleic anhydride (.2 mmol), xylenes (500 ?L dispensed by Eppendorf pipette)

7.41 7.40 7.39 7.38 7.35 7.34 7.26 cdc3 7.34 7.33 7.22 1.8 C (dd) 7.34 7.21 7.21 7.20 7.20 7.18 B (dd) A (dt) 7.39 7.20 1.98 1.93 4.00 7.45 7.6 7.4 7.2 7.0 6.8 dielsalderproductPROTON0270 yield 6.6 7.40 7.35 6.4 6.2 7.30 7.25 7.20 7.15 7.10 f1 (ppm) 6.0 5.8 5.6 5.4 f1 (ppm) 5.2 5.0 4.84 4.83 4.83 3.60 3.58 3.56 3.54 3.52 3.50 3.48 3.46 f1 (ppm)

A compound, C11H12O2, has an IR spectrum showing a peak at 1710 cm-1. Its 1H NMR spectrum has peaks at delta 1.3 (3 H, triplet), 4.3 (2 H, quartet), 6.5 (1 H, doublet), 7.4-7.6 (5 H, multiplet), and 7.7 (1 H, doublet). Draw its structure in the window below. You do not have to consider stereochemistry. You do not have to explicitly draw H atoms.

Describe how you would prepare a solid ore sample for analysis of total iron content by MnO4- titration? Explain why each step in the preparation is necessary.

Please choose the option that best represents the product expected from treatment of reagent I under the set of conditions shown. 1) HOAC, Br2 2) Pyridine 3) MeCuli 4) NH,NH, KOH Reagent I CH CH, (A) (B) CH CH (C) (D) (E) None of the provided options

1, (nonane) 4 (octane) Injection 2.35a ww 40 Nonane Octane Time Detector response ,D. Suppose that the sample size for the above chromatogram was 3.0 mg, the column dimensions were 4.0 mm diameter 1.00m length, and the flow rate was 7.0 mL min. What size column and what flow rate should be used to obtain the same quality of separation of 27.0 mg

Finaul product of the reaction PhCECH CH3 MgBr, 2. 3. H30, cold

The most likely strudure from data interfreation is Ethyl a Spectra the chasiactexistics Beo ks Obsouved at 1730 cmand 1140 cm The aromatic pipthyl benzoate. According to FTIR ether is CC peok Es obscrved at 14521600 cm. hing obseured at 3000 cmi is obsenved at Atiphatic CH stretch and asromatic cH 34003045cm. mass spectra, mokuuan ion peok is 164

The pressure exerted by a column of liquid is equal to the product of the height of the column times the gravitational constat times the densty of the liquid Pghd How highacolun of mathane d 0.79 giml) would be supportad by a pressure that supports a 713 mm column of mercuty (d 136 ghml 9.7. 10 mm 1210 mm 17 mm 41mm 713 mm

The pressure exerted by a column of liquid is equal to the product of the height of the column times the gravitational constant times the density of the liquid, P = ghd. How high a column of water (d = 1.0 g/mL) would be supported by a pressure that supports a 713 mm column of mercury (d = 13.6 g/mL)?

33) Hyperforin is an organic molecule with a molecular mass of 536.797 gramsmole, and is produced by a plant called St. Johns wort. Hyperforin may have antidepressant properties in humans (though this is not known with certainty). Recently, chemists have reported the synthesis of hyperforin from inexpensive, small molecule precursors. How could

Determine the symmetry of the groups of orbitals for the sigma () bonds of the ligand in an octahedral complex.

Window Help 23 hhhnsted.cu a S Experiment 10713 online Properties of Organic Compounds.pdf (page 6 of 6)Edted Q Search Compound Functional group family name H3COH CH3CH2CH3 H2CCH2 H3COCHS H3CNH2 H3C COH H3C CH H,C CH3 16 MacBook A

Calculate the number of 40 19K atoms in the KCl sample. (Numbers to be considered: the molar mass of KCl =74.6 g; Avogadro Number = 6.02x1023; Isotopic abundance of 40 19K = 0.01 %).

Aluminum reacts with concentrated hydrochloric acid to produce hydrogen gas. 2 Al(s) 6 HCI(aq) 2 AICI, (aq) 3 H, (g) Calculate the mass of Al(s) that is required to produce 547.0 mL of H, (g) at STP. mass

Balance this equation: CH4(g)+O2(g)CO2(g)+H2O(l) Express your answer as a chemical equation. Identify all of the phases in your answer.

As a pharmacist working as a district manager assistant for rite aid pharmacy In 500 words Describe your working with Healthcare IT Applications (e.g. Medicaid/Medicare - Claim, Eligibility, Enrollment, EDI, etc..)?

1. In top-down hormone signaling, after sensory input from the environment, the neuroendocrine signals are released by the .................. of the brain which then travel to the anterior or posterior .............. glands. 2. Housekeeping genes are often under ................... expression whereas regulated genes often are controlled by either

What do a scuba diver ascending from a deep dive and a mountaineer ascending the sides of a massive peak have in common? In both cases, they experience decreasing pressures. And in both cases, the pressure decreases can result in life-threatening sicknesses. For the scuba diver, ascending too quickly can cause bubbles to form in blood and tissues,

A supergene ore from a magmatic nickel sulphide deposit near Kambalda contains pyrite, violarite (FeNi2S4), chalcopyrite and millerite (NiS). Using the table of mean atomic numbers (, in notes) and the formula for calculating (mean Z, in notes) discuss the suitability of using an SEM/back-scattered electron (BE) system for carrying out

Compare the structures of picric acid, cresol and aniline. Which of the factors that determine acid strength (- size, electronegativity, hybridization, inductive effects, or resonance) apply to create the relative acidity of one to the other?

Data and Observations Tube A Mass of tube 18.504g boiling chip Mass of tube, boiling chip and NazCO3 18.8613 Mass of tube, boiling chip and NaCI 18.8733 Mass of NazCO3 Moles of NazCO3 Mass of NaCl Moles of NaCI Moles Naci Ratio of Moles NazC03 Predicted (theoretical) moles of NaCl (use stoichiometry) Yield of NaCl

1- Calculate the de Broglie wavelength of an electron that travels with 5.0 x 105 m/s. Also, calculate the de Broglie wavelength of a ball with a mass of 50 g traveling with 50 Km/h. Explain why we don\'t observe wave-particle duality in our macroscopic world using the results. 2- calculate the velocity of the ball when you want the ball to have a

To disinfect a swimming pool, you must add chlorine until the concentration is 1ppm, or 1 g of chlorine per million grams of water. Use Dimensional Analysis to calculate what volume of an 8.0% by mass chlorine solution that you would need to add to a swimming pool that contains 2.0 104 gallons of water.

Determine the number of electron pairs involved in Co-Co bonding in [Co6N(CO)18]1-

Determine the solubility (11) bli 3 (molL) of N2 in water exposed to air at 25C if the atmospheric pressure is 2.1 atm. Assume that the mole fraction of nitrogen is 0.65 in air and the Henrys law constant for nitrogen in water at this temperature is 6.1 x 102 Matm. ) ( 8888TEC

Medical Case Study: Testing for Kidney Disease Patients with kidney disease often have protein in their urine. While small amounts of protein are not very worrisome, more than 1 gram of protein excreted in 24 hours warrants active treatment. The most accurate method for measuring urine protein is to have the patient collect all his or her urine in

2. (20) The electrochemical cell represented in accompanying diagram consists of two electrodes. One is a solid NiONi mixture. The other is a gaseous Oz electrode The porous platinum coating acts only as catalyst. Porous NiONi platinum Zro,Y,0, (solid solution) O2 The electrolyte is a ZrOYO solid solution yhat conducts oxygen ions (0) between the

How many electron groups does a central atom have that has two single bonds and two lone pairs?

If butyl rubber gloves (0.04 cm thick) are used, what is the breakthrough time (tb), i.e., how long could the gloves be used before methylene chloride reaches the hand? diffusion coefficient in butyl rubber: D = 110 x10-8 cm2/s When we solve this problem, we use this eq. Tb=l^(2)/6D How can I make this equation???

a) Based on the simplified model above, formulate the system of equations in order to detemine the required firing temperature, I and the gross calorific value of coal, C such that Manjung 1 plant produces the emission of 500 mgNm and 450 mgNm for SOo and NO, respectively. ,Recently, the Department of Environmental in the Ministry of Energy,

Recently, the Department of Environmental in the Ministry of Energy, Science, Technology, Environment and Climate Change has revised the Environmental Quality (Clean Air) Regulations. The Regulations stipulate, among others, that any coalfired thermal power plant operating in Malaysia must meet the GHG emission limit of 500 mgNm for sulphur ioxide

If the covalent reaction suspected in Xb is occurs, which would you predict to have the lower IC50 value, X = OMe or X = NO2 ? Briefly explain.

NaOEt, Ether Heat H H20 workup (racemic)

Which of the following would NOT lead to altered (increased or decreased) cholesterol levels in liver cells A mutation in HMGCOA lyase that inhibits its activity A. B. A mutation in site 2 protease (S2P) that inhibits its activity C. None of the choices would lead to altered cholesterol levels in cells D. A mutation in cytosolic ATPcitrate lyase

Draw a stepwise detailed mechanism for each of The following nucleophilic substitution reaction. Used curved arrows to show the movement of electrons, and draw the product including stereochemistry

6) Draw a stepwise detailed mechanism for each of the following nucleophilic substitution reactions. Use curved arrows to show the movement of electrons, and draw the products including stereochemistry. I (4 points each) CH,OH CH,OH DMSO CH,ONa

Guided Virtual Lab Activity The Complex Nickel Salt Procedure Data Observations D Accurately weigh approximately 0.05 g of salt A or B and quantitatively transfer it into an Erlenmeyer flask. Salt A was analyzed. It was a pale blue powder, 0.0513 g Salt A 2) Add 10.00 mL of standardized 0.2 M HCI (aq) and 23 drops of Bromocresol green indicator

0.1 M CH3COOH with 0.1 M NH3. The relative conductivities of the solutions tested are as follows: 0.1 M CH3COOH/0.1 M NH3 measured in parallel:

(b) 0.1 M CH,COOH with 0.1 M NH,. The relative conductivities of the solutions tested are as follows 0.1 M CH,COOH0.1 M NH, measured in parallel . Mixture measured in parallel Do the reactants exist as molecules or ions Does the conductivity change indicate the creation of more ions or a decrease in the number of ions The total ionic equation for

Entropy (kaatom) 5. Consider the plot of the vibrational entropy Svib below for this material (remember 1043 K. What is the effect, if at all, that Sko). The grey vertical line shows T of including Advib in AF Fdis (7) Ford (7) (2 points) 6. I guesstimated a few (T, S) points from the plot below and used my mad Excel skills to fit a logarithmic

In a combustion chamber, oxygen diffuses through air to the carbon surface where it reacts to make CO and/or CO 2 . The mole fraction of oxygen at x=0 is 0.21. The reaction at the surface may be assumed to be instantaneous. No reaction occurs in the gas film. Determine the rate of oxygen diffusion per hour through 1 m² of area if: a. Only

In a combustion chamber, oxygen diffuses through air to the carbon surface where it reacts to make CO andor CO2. The mole fraction of oxygen at x0 is 0.21. The reaction at the surface may be assumed to be instantaneous. No reaction occurs in the gas film. Determine the rate of oxygen diffusion per hour through 1 m of area if a. Only carbon

Pi symbolizes inorganic phosphate please show and explain the math

(6.1) The pKa of the following acidbase reactions, HA A H, is approximately 7. H,PO, HPO H HADP2 ADP3 H HATP3ATP H On the assumption that, at pH 7, we may ignore other charged species of these compounds, show that the average charge of P, ADP, and ATP is 1.5, 2.5, and 3.5, respectively, by expressing the probability, T, of the deprotonated

Calculate the molar solubility (aq., 20 C) of aluminum hydroxide, Al(OH)3, in 0.0188 M aluminum nitrate, Al(NO3)3. The Ksp of Al(OH), is 2.0 x 10-32.

Propose arrow mechanisms for transesterification under both acid and basic conditions. Why is the first step different in each case?

CH,OH HO OCH3

19) For the following reaction, the equilibrium concentration of NO2 is 0.38 M and equilibrium concentration of N204 is 1.0 M. What is the value of the equilibrium constant 2NO2(g) N204(g) A) 0.14 B) 2.6 C) 6.9 D) 0.38 E) 1.0

draw a pentapeptide that is trans with one acidic residue, a histidine residue, one residue (cannot be amino or carboxylate terminus) needs to be proline, draw it fully protonated with phi and psi angles labeled, what is the pI of the pepride

You have synthesized a pure molecule with molecular formula SOF4. However, you remember that it has two possible isomers ) and are trying to determine which isomer you have synthesized. Both isomers have distorted trigonal bipyramidal structures but one has the oxygen atom in the equatorial position and the other has oxygen in the axial position.

Polyaniline Synthesis

QA2 Explain what would happen to the solutions if you added the contents of vial 1 on top of vial 2. How would this affect the polyaniline product (2)

How many moles of benzoic acid did was used in this reaction? How many moles of methanol was used? Why was the particular molar ratio of reactants chosen? Picture below of the mechanism.

Time remaining: 01 : 59 : 39 Chemistry Part B What is the label for the orbital shown here that indicates the type of orbital and its orientation in space? Express your answer using appropriate letters (e.g., pxpx). Do not include the energy level nnn. Part C Compare the orbital shown in Parts A and B to the orbital shown here in size, shape, and

Part B What is the label for the orbital shown here that indicates the type of orbital and its orientation in space? Express your answer using appropriate letters (e.g., pxpx). Do not include the energy level nnn. Part C Compare the orbital shown in Parts A and B to the orbital shown here in size, shape, and orientation. Which quantum number(s)

Guided Virtual Lab Activity The Complex Nickel Salt Procedure Data Observations D Accurately weigh approximately 0.05 g of salt A or B and quantitatively transfer it into an Erlenmeyer flask. Salt A was analyzed. It was a pale blue powder, 0.0513 g Salt A 2) Add 10.00 mL of standardized 0.2 M HCI (aq) and 23 drops of Bromocresol green indicator

(6.1) The pk of the following acidbase reactions, HA A H, is approximately 7. HPO4 HPO H HADP ADP H HATP3 ATPH On the assumption that, at pH 7, we may ignore other charged species of these compounds, show that the average charge of P, ADP, and ATP is 1.5, 2.5, and 3.5, respectively, by expressing the probability, A, of the deprotonated state,

Were there any compounds that you could not positively ID based on the materials and instruments you had available to you? Explain if needed. Explain your use of a Bunsen burner and how it did or did not help with identification. Explain your thoughts on whether or not using solely IR is a good method to make positive IDs of chemicals. Does water

Solid silver chromate is added to pure water at 25 C. Some of the solid remains undissolved at the bottom of the flask. The mixture is stirred for several days to ensure that equilibrium is achieved between the undissolved Ag2CrO4 and the solution. Analysis of the equilibrated solution shows that its silver ion concentration is 13*10^-4 M.

MIB (Methylisoborneol) is one of the by-products of algae and is a representative trace pollutant that causes taste and smell of water. The isothermal adsorption equation of 2-MIB applied with activated carbon in water without organic matter was experimentally determined as follows. q = 1.48C^(0.65) Where q is ng 2-MIB / g activated carbon and C

(b) (i) Identify the main product and supramolecular interactions for each of the (7 marks) following selfassembly reactions. Bu. Bu CHCI3 H H Bu N. Bu CHCI3 K Me Bu Bu CHCI3 (ii) Consider the products J and K. Which one would you expect to be more stable Explain your answer. (4 marks)

What do you mean by chemistry. Brief describe it in daily life example. Who is the father of chemistry?

Which hydrogen is most acidic OHE A. A B. B and C C.D and E D. E HB H OHD HA O

In the solvent hexane, the average endtoend distance of a 7 kDa molecular weight poly(ethylene glycol) polymer chain is 3.65 nm and the average endtoend distance of a 56 kDa molecular weight poly(ethylene glycol) polymer chain is 7.30 nm. By calculation, show whether hexane is a good, poor or theta solvent for poly(ethylene glycol). (i) (7 marks)

What is FCC and BCC STRUCTURES in solid states. Explain with example

2. Determine the density of a copper specimen with a dislocation density of 108 mm 2 given that density of a copper specimen with a dislocation density of 10 mm2 is 8.920 gcm3. (Radius of Cu atom is 1.30x107 mm and copper metal adopts fcc structure.)

a. Draw the Haworth projection of monosaccharide A in the Banomer (pyranose). b. Draw the chair conformation of the monosaccharide A in the Banomer. c. Draw the Haworth projection for the enantiomer of A as aanomer. d. Draw a disaccharide of A with B(16) linkage. e. If the disaccharide in 1d is reacted with Benedicts reagent, draw the product

(30 Points) Suppose there are two tanks, each initially containing 100 gallons of salt water, connected to a series of pipes as shown at right. Initially, the amount of salt in the first tank is 20 pounds, while that in the second tank is 5 pounds. Pure Water Mixture 2 galmin 1 galmin T, T2 At some point, a mechanism is started whereby fluid some

Which mutation generally has the largest potential for affecting the physiological function of a protein Replacement of Asp with Glu Replacement B. of lle with Leu Replacement C. of Asp with Lys Replacement D. of Lys with His

6. The following reaction is catalyzed by acetate kinase. It was experimentally determined that this is a random bi bi reaction. (15 pts). ATP CH,CO, ADP CHCO,PO, a) Write the chemical equilibrium scheme for this reaction. (7 pts). b) Draw the Cleland diagram for this reaction (8 pts).

O GASES Using the ideal equation of state A chemical engineer must calculate the maximum safe operating temperature of a highpressure gas reaction vessel. The vessel is a stainlesssteel cylinder that measures 14.0 cm wide and 16.8 cm high. The maximum safe pressure inside the vessel has been measured to be 5.70 MPa. For a certain reaction the

QA2 Explain what would happen to the solutions if you added the contents of vial 1 on top of vial 2. How would this affect the polyaniline product (2)

Estimate the actual ratio (range) of 3phosphoglycerate and phosphoenolpyruvate that exists in physiological conditions in erythrocytes. In order to get full credit, you must write down the equations and the values of every relevant variable, including the source of each variable (in Supplementary Information) and any assumptions you make.

A silicate mineral composed of Si, Mn and O ions Si has a coordination number of 4 Mn has a coordination number of 6 20 There are a total of 8 possible tetrahedral sites Off these possible 8 tetrahedral sites, 1 is filled There are a total of 4 possible octahedral sites Of these possible 4 octahedral sites, 2 are filled (e) What is the bond

can you explain how would you get the 66.64 as slope? And what is the X and Y in the LR based on the table?

A lithium ionselective electrode gave the potentials given below for the following standard solutions of LiCl and two unknown samples solution (ali), M Potential vs SCE, mV 0.100 1.0 0.050 30.0 0.010 60.0 0.001 138.0 unknown 1 48.5 unknown 2 75.3 Construct a calibration curve of potential versus log ali. Does the electrode follow the Nernst

The rate constant for water solvent exchange in Cr(H2O)62 is 108 s1 whereas that of Cr(H2O)63 is 2.4 x 106 s1. Use the qualitative theory developed by Taube to explain why the rate constants for these two aqua complexes differ by a factor of 1014.

The solidification speed of salol is about 2.3 mm/min 21 at 10C. Using Equation (7.15), estimate the energy barrier q that must be crossed by molecules moving from liquid sites to solid sites. The melting point of salol is 43C and its latent heat of fusion is 3.2 X 10-20 J/mol. Assume that the molecular diameter is about 1 nm.

7. An adiabatic packed bed reactor is to be used for the oxidation of sulphur dioxide. The reactor consists of three beds, bed 1 contains 15 tonnes of catalyst and beds 2 and 3 contains 5 tonnes of catalyst each. Between each subsequent bed is an external heat exchanger, prior to bed 2 the reaction mixture is brought to 750 K and prior to bed 3

The extra residue was purposely left out and one has to be repeated by systematically solving it and finding where the last on goes. I'm just as confused as you on how to do this without the last or repeated residue. Any help would be appreciated.

2. An octapeptide was found to contain the following residues G, K, M, P, R, W, E o Edman degradation yielded NH o Upon treatment with carboxypeptidases A, B, and Y, only carboxypeptidase Y had any effect o Trypsin treatment gave two tripeptides and a dipeptide Chymotrypsin treatment gave two tripeptides and a dipeptide Cyanogen bromide treatment

22.0 mL of 0.100 M NaOH is required to titrate 0.500 g of a mixture containing ascorbic acid. Calculate the % ascorbic acid in the mixture. (The molar mass of ascorbic acid is 176.13 g/mol)

1. A possible electron configuration of excited Fe atom is (1 Point) Ar4s3d O Ar4s 3d Ar4s3d Ar4s3d4p Ar4s3d4p

a) Give the reagents (i) to (ii) in these reactions. b) draw a mechanism for steps (i) and (ii)

1. (a) Give the reagents (i) to (ii) in these reactions OH (i) (ii) H3C CS ScareawA mPheniersterthe steps (1) and (ii)

What is the final temperature of 150.1 g of water (specific heat = 4.18 J/gC) at 24.2C that absorbed 950. J of heat?

5. a) Write the anode and cathode reactions for the Si 4LiNiCoaMnao, in lithium cell during charge and discharge, b) Explain major voltage losses of the battery during discharge under a constant current load. 5points 5points c) Suppose you are designing a 10Ah cell as the building block unit for a battery pack. Calculate how many grams of anode