Chemistry Questions and Answers June 03, 2020

An oxidation pond having a surface area of 90,000 m 2 is loaded with a waste flow of 500 m 3 /d containing 180 kg of BOD 5 . The operating depth is from 0.6 to 1.6 m. Using the Michigan rules. Determine whether this design is acceptable.

Dilution is the process whereby the concentration of a solution is lessened by the addition of solvent. The relation between the concentrations of the solution at two different volumes is as follows. Where V 1 is the initial Volume , C 1 is the initial concentration, V 2 is the final

C,V, C,V, GV V C,

The relaxation time is =1 s for a sample of bacterial DNA molecules having a molecular weight of 108 g/mol in concentrated solution. Given that the elastic moduli of concentrated DNA solutions of 10000 base pairs and higher display a plateau modulus, what is the relaxation time of fruit fly DNA molecules having a molecular weight of 2010 9 g/mol?

Consider a stock with current price 10 which over the next year can move up to 12 with probability 0.6 and down to 8 with probability 0.4. The annual riskfree rate is 2. Required a) What are the ArrowDebreu prices (, 2) consistent with no arbitrage What are the riskneutral probabilities, qu and qa Now consider a put and call options on this asset.

Consider a 2sector model with labour mobility across the sector as explained in Lecture video 10. In sector 1, production function is given by Y In L, and in sector 2, it is Y In L. The total labour force in this economy is 400 workers. i. Draw a well labeled graph showing the initial allocation of workers following the steps discussed in

What is the minimum number of Gordon growth models needed to replicate the price of an 5-stage discount model with different growth rates in each stage?

1. A tech-stock carve-out in which a business line by a tech company becomes an independent tech company with its own listed stock would, without any other change in capital structure, be ... a. Group of answer choices opposed by debtbolders and opposed by shareholders. b. welcomed by debtbolders and welcomed by shareholders. c. welcomed by

Sporting World Pty Ltd is a rapidly evolving online retailer that aims to dominate the speciality sporting goods and apparel market in Australia. The company sells a variety of sporting goods, such as footballs, cricket gear, tennis racquets, golf clubs, basketballs, hockey sticks, swimming accessories as well as a variety of sports apparel,

Assume stock A costs 100 at t 0 in a twoperiod world. There are two scenarios 1 good and bad. In the good scenario the stock price rises to 120 dollars and in the bad scenario stock price declines to 70. The probability of both these scenarios is p 0.5. The annual riskless rate is 10. Your broker offers you a call option with strike price of 110

(Barke) Consider an MM1, MMe or MM quese with arrival rate. In the steady state, the deportarea from the system forma Poisson process with rate X, independently of a (so long as X). Furthermore, at time t the number of customers in the quese is independent of the departure process prior to time t. Problem 4 Consider a twostage tandem network

Max Weber was surprised to find that the profitability of the small local electric retailer market segment to the NBD ltd was much less than expected after the customer-service costs had been allocated. He was unsure whether the customer-profitability analyses meant that NBD Ltd should consider quitting the small local electrical retailer market

Consider two samples of helium in separate containers of the same volume. Sample 1 has an absolute temperature four times that of Sample 2. Both samples are at the same pressure. Calculate the ratio Z1/Z2. a). 4:1 b). 2:1 c). 1:2 d). 1:4 e). 1:1

Imagine a twostate world with a financial market. In the market, there is a stock with current price 100. In the next period, the stock either rises to 110 with a 60 probability or declines to 90 with 40 probability. We also have a European call option on the stock maturing next period with strike price 88 and current price of 10. i. Is the market

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Consider the following current ratios for the past five years 2014 Ind. Average 2.5 2016 2018 3.2 2017 2.9 2015 2.6 Current Ratio 2.8 1.5 Note Keep your answers brief and to the pointbullet points are just fine. A. Describe the general trend over the years presented. B. Describe three positive circumstances that might be at work. C. Describe

H,O, OH, and pH Important equations H,O) x OH 1.00 x 1014 pH logH,O A solution has a pH 11.75 .Determine whether this solution is acidic, basic, or neutral. Calculate the H,O) and OH for this solution 2 Write the net ionic equation of NaHSo, with water that explains why a solution of NaHSO, is acidic. Write the net ionic equation of NaHCo, with

3. Exercise Consider a stock with price (St) 120. (i) Consider a bull spread at current time t 0, consisting of a long call option with strike 10 and a short call option with strike 30, both with maturity T 1. Compute its payoff and draw its graph. Show that it is nonnegative for all values of ST. (ii) Use monotonicity theorem to conclude that

2. Partial hydrogenation of the triene shown below results in two compounds, A and B, both of molecular formula CioH14. In hexane (solvent), compound A shows a Amax235 nm and B, 275 nm. Assign the structures. What is the third possible isomer not observed as a product of this hydrogenation If formed, in what region would you expect it to absorb UV

A. carboxylic acid or carboxylate the molecule serving as each of the following in the BronstedLowry equilibrium acid conjugate base base conjugate acid RCOOH RCOO H ,B. Express Ka as the ratio of reactants and products. In the box below, complete the expression of Ka by dragging the applicable terms from the equilibrium to the appropriate

Draw all reasonable resonance structures of the following molecule. Please remember to add in all electron pairs, when needed.

The reaction A( aq ) + B( aq ) Products( aq ) was studied, and the following data were obtained: [A] 0 (mol/L) [B] 0 (mol/L) Initial rate (mol/Ls) 0.12 0.18 1.2610 -1 0.060 0.12 4.1910 -2 0.0300 0.90 1.5710 -2 0.240 0.90 1.2610 -1 The rate constant for the reaction without units is _____.

Which of the following statements) is are False l). Fluorescence stops right after the source of excitatory radiation is switched off, whereas for phosphorescence an afterglow with durations of fractions of a second up to hours can occur II). Fluorescence is an absorption process in which atoms or molecules are excited by the absorption of

3. What is the order in which the following compounds would be eluted from an HPLC column containing normalphase packing a. Benzene, diethyl ether, nhexane b. Acetone, dichloroethane, acetamide 4. What is the order in which the following compounds would be eluted from an HPLC column containing reversedphase packing a. Ethyl acetate, acetic acid,

Helen, Isis, Juan and Kelly, members of an architectural firm, plan to meet in the company conference room to discuss the project coordinators plans for their next project. Denoting these four people by H, I, J, and K, list all the possible sets of this group in which one person can gather. Choose the correct answer below. O A. (H,I,J,K, O B. H,

Perform the following base conversions using subtraction or division-remainder: a) 588 10 = _________ 3 b) 2254 10 = _________ 5 c) 652 10 = _________ 7 d) 3104 10 = _________ 9 e) 137 10 = _________ 3

a) A 25.3 mg sample of sodium carbonate is present in a container. i) Write the formula of sodium carbonate (Write numbers on same level as lettersno subscripts or superscripts.) 1000 mg 1g 1 mol 6.022 x 1023 particles ) i) calculate the of O atoms in the sample 10 O atoms ii) calculate the of Na atoms in the sample 10 Na atoms b) i) Write

For the ammonia synthesis reaction written: with 0.5 mol N 2 and 1.5 mol H 2 as the initial amounts of reactants and with the assumption that the equilibrium mixture is an ideal gas, show that:

N2g) H2(g) NH3 (8)

A 3.4842 g sample of a solid mixture containing benzoic acid (C,H,COOH, 122.123 g mol) was dissolved and titrated with strong base to a phenolphthalein endpoint. The acid in the sample consumed 41.36 mL of 0.2328M NaOH. Calculate the percent (wtwt) benzoic acid in the sample and its uncertainty. Use the following information The position of the

If the solubility of iron(II) hydroxide is 3.69 x 10 - 3 g in 400 liters at 18.0C What is the Ksp of iron(II) hydroxide at 18.0C?

How moles of lithium phosphate (LigPO4) are contained in 77.7 g of lithium phosphate many O 0.671 O 4.68 x 1025 O 1.29 x 1022 O 9.00 x 103 O 116

Before performing NCL, the two peptide fragments of barstar must first of all be synthesised using SPPS. Provide a general reaction scheme that details how one of the peptide fragments could be synthesised. Your answer should include the following information (i) The type of resin used. (ii) The protecting group used for the protection of the

Write the wave function for the ground state of Helium (He) by using the spin-orbit functions i) assume that electrons behave like fermions. ii) assume that electrons behave like bosons.

1. Given 100 g of styrene, and the appropriate apparatus and conditions to conduct the anionic polymerization of this monomer with nbutyllithium, calculate the expected average molecular weight of the resultant living polymer chains if you could introduce exactly 500 molecules of nbutyllithium. Assume no termination and total usage of the monomer

An aqueous solution contains a mixture of 0.0026 M of Fe 2+ and 0.0026 M of Al 3+ ions. In order to separate these ions, an aqueous solution of sodium hydroxide has to to be added. Given that Ksp of Fe(OH) 2 is 8.0 X 10 -16 and the Ksp of Al(OH) 3 is 4.6 X 10 -33 what is the concentration of the sodium hydroxide needed to precipitate out the first

White light ( 7000 4000) is projected on a photoelectric tube whose contact energy is 2eV. Adjust the stop voltage so that there is no current at all. What will be the impact on one of the following three variables: 1) The threshold frequency; 2) Saturation current; 3) The stopping voltage under each of the changes in the experimental conditions

Propose a plausible arrow pushing mechanism for the following transformation. Hint hydrolysis of acetal followed by ester formation. (8 pts.) te H3O HO.

Propose a plausible arrow pushing mechanism for the following transformation. Show all steps What is the driving force for this reaction (8 pts.) H,N. , H NH

Provide a reasonable synthesis for each of the following using the provided starting material and any other organic or inorganic reagents. a. b. OH CO,E

Describe what each reagent does in SDS Page 1. Sodium dodecyl sulfate 2. Polyacrylamide 3. Mercaptoethanol

A student places 25.0 mL of 0.100 M hydrazoic acid (HN3) in an Erlenmeyer flask and adds indicator. She then adds 5.0 mL of standardized 0.200 M NaOH. Which is the best method to solve for the pH . Ka ICE Table with HN30.100 M and N3 0.200 M B. K ICE Table with HN30.100 M C. HendersonHasselbach Ka ICE Table with HN3new concentration after the

In the large boxes, fill in the structure of ONE MAJOR PRODUCT, and in the small boxes, fill in the reagent(s) necessary to achieve each transformation. In some small boxes, you may need more than one step. CN SOCI 1. PIMgDr 2. H0 CH,OH 1. Me Culi 2 H20 NH 1. excons LAH 1, DIBALH 2. H,0 PCC 1. MoMgBr 2. H,0

Week 1 2 3 4 5 6 LC% 30% 60% 70% 80% 90% 100% We have a new team with this learning curve and a labor cost of $ 1.3 per unit. If the capacity is 16,457 units per week, how much would be the labor learning cost.

When alkaline phosphatase is added to substrate in borate buffer (pH 9.5) and allowed to sit at room temperature for 3 min, a yellow colour is seen to develop. Select the following option(s) that describe this situation. ,O A highly intense yellow colour indicates a high concentration of product in solution O A highly intense yellow colour

A saline solution contains 175.5 g of NaCl per liter of solution. Using a water density of 0.9982 gcm, express the concentration of NaCl in terms of (1) molality, (2) molarity, (3) normality, (4) parts per million, (5) milligrams per liter, (6) weight percent, and (7) pounds per barrel of water.

Provide the mechanism for the reaction catalyzed by histidine decarboxylase, which is not a PLPdependent enzyme, but rather contains a pyruvamide group at the Nterminus (as drawn below). For the mechanism, begin with histidine and the modified enzyme given below, and be sure to make note of any needed generalspecific bases or acids. NMEnzyme For

Draw a reaction scheme showing the activation of the acid group of the fungal metabolite macrophomic acid with DCC and NHS in dichloromethane. What would be the product(s) of reaction of two equivalents of NHSactivated macrophomic acid with cystamine, followed by TCEP Show each step, with any intermediate species andor reaction byproducts. CH,

A liquid fuel has a reported gross enthalpy of combustion of 35.0 MJ kg and a corresponding net value of 33.2 MJ kg. A moisture contamination of 1.7 ww of water was determined. Calculate the percentage weight of organic hydrogen that must be also present in the fuel. (Latent heat of water condensation 2.26 MJ kg. Atomic Mass O 16, H 1)

Soil water with 10^-3 N alkalinity is in equilibrium with a soil gas in which PCO2 = 10^-1 atm. Calculate the pH and total dissolved inorganic carbon concentration (M).

A sample of purified DNA was incubated with deoxyribonuclease (DNAse) at 37oC. An aliquot was removed from the reaction mixture every minute for 5 minutes and the A260 recorded. The following data were obtained. Time (min) A260 0 0.60 1 0.64 2 0.67 3 0.70 4 0.72 5 0.73 Describe the action of deoxyribonuclease on DNA and explain the increase in

a) List the four types of biomolecules that we learned about this week and state which type of linkage holds each biomolecule together. Draw an example of each linkage. b) Describe the four levels of protein structure. c) What is the difference in chemical structure between DNA and RNA?

In a weak base with strong acid titration, which of the following is correct O the equivalence point pH is less than 7 because only the conjugate acid remains the equivalence point pH is less than 7 because the acid is stronger than the base O the equivalence point pH equals 7 because (H3O) OH O the equivalence point pH is greater than 7 because

Determine the total Valence Electrons, VSEPR Notations, Electron Geometry (family) and Molecular Geometry (shape) for the following molecules CIO,F XeF2 BrCl5 SO2

Determine the Bond and Molecular Polarity for the following molecules. SO3 CH4 H2S XeF4

Which structure represents the product of the following SN2 reaction C2H5O Na CH3 ( Na H3C HC H3C.. H3C A D

Fill in the intermediate step(s) in the and the product(s) in the boxes. H2SO, H20 1.BH3.THF HgSO, 2. H2O2 NAOH

Classify 0.10 M aqueous solutions of each of these salts at 25 C as acidic, basic or neutral. Mg3(PO,)2 magnesium phosphate LICI lithium chloride CHNHBr methylammonium bromide magnesium phosphate IChoose lithium chloride Choose methylammonium bromide Choose

The molecular equation for the reaction that take place when two aqueous solutions are mixed is given below. Na2CO3(aq) MgCl2(aq) MgCO( ) NaCl( ) a. Predict the physical status of the products, using the solubility rules chart, and indicate below. (4 pts) MgCO3 NaCl b. Write the balanced molecular equation. c. Write the balanced total ionic

0.602 K. Find its 5.8. (a) For N,O, a linear molecule, 0, moment of inertia. (M 44.010 gmol.) (b) Compute its translational and rotational entropies at 3D 298.15 K and 1 atm.

Explain why compound A readily decarboxylates (forming pyrrole) when heated with acid, but compounds B and C do not under the same conditions. CO.M COM coH

Consider a 2mlong wire of thermal diffusivity a1 subjected to initial temperature 3x(2x) and boundary temperature 1 and t. The governing equation is a at subject to T(0,t) 1,T(2,t) t and T(x, 0) 3x(2 x) a) Write the system of equations to determine the temperature at t0.125 d according to the CrankNicolson method with At0.125d and Ax0.5m. b)

Why it is possible/ applicable to use recrystallization and vacuum filtration with Luminol? Cite some reasons.

1 points Save And Why was the alkaline phosphatase solution allowed to warm to room temperature immediately before use in the enzyme assays in Practical 4 O Prewarming the alkaline phosphatase solution to room temperature allowed the enzyme to reach the same condition used to run the assay. This prevented any reduction in temperature that would

What is the approximate initial velocity of the enzyme catalysed reaction shown in the graph below?

Rate of enzyme catalysed reaction 0.8 y 0.3576x 0.0234 R 0.9921 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.5 1.5 2. 2.5 Time (min) Absorbance (405 nm)

Phosphatase enzymes catalyse what type of reaction. O Glycosylation. Acetylation. Phosphorylation (addition of a phosphoryl group (PO3) to an organic molecule). Catalytic removal of a phosphate group via hydrolysis. O Ubiquitination.

options are A) 171 micro molar B) 163 micro molar C) 157 micro molar D) 150 micro molar E) it would not appropriate to use the absorbance measured for this unknown sample as it shows a reading above the range of the data used to generate the standard curve

Consider the standard curve of 2,6dicholorophenol indophenol (DCIP) shown below. Determine the concentration of DCIP in an unknown sample if the Absorbance (at 620 nm) of the unknown sample was 0.913. Standard curve of DCIP measured at 620 nm 0.5 y 0.0058x 0.003 0.4 R2 0.9977 A 0.3 0.2 0.1 10 30 40 50 60 70 80 90 DCIP (uM) Absorbance (620 nm) 20

Large pieces of iron react more quickly with acids than finely divided iron powder reacts with acids. True False

Consider a Lineweaver Burk plot. What value is associated with the xintercept O1Km O Vmax O 1IS O 1Vmax O Km

Why was the alkaline phosphatase solution allowed to warm to room temperature immediately before use in the enzyme assays in Practical 4 O Prewarming the alkaline phosphatase solution to room temperature allowed the enzyme to reach the same condition used to run the assay. This prevented any reduction in temperature that would have occurred if the

When alkaline phosphatase is added to substrate in borate buffer (pH 9.5) and allowed to sit at room temperature for 3 min, a yellow colour is seen to develop. Select the following option(s) that describe this situation. O A highly intense yellow colour indicates a high concentration of product in solution O A highly intense yellow colour

Unit conversion Convert 0.015 mMs to uMs O 0.9 Ms O 15 Ms O 0.000015 Ms O 150 Ms O 0.15 uMs

determine the length of the hydrogen bonds between: TYR41H and GLU37O ALA39H and MET35O GLU38H and ILE34O THR36H and ARG32O ARG32H and TYR28O by using PyMOL

What pH is needed to produce this value of Q if the concentration and pressure values are Br2 3.00 x 104M, Br 12.65M. SO, 9.00M, and Pso, 2.25 x 10Patm 3D 3D Express your answer numerically to two decimal places. View Available Hint(s) pH

Which of the following reactions form the product shown. Ch NaOH H0 H0 1 (CHCOH. Hg(0COFab CHs CHS 2. NABH, HBr Br HO CH, CH2 CHCHS CHCH, HC. OH

Determine the length of the hydrogen bonds between: TYR41H and GLU37O ALA39H and MET35O GLU38H and ILE34O THR36H and ARG32O ARG32H and TYR28O by using PyMOL And identify the residues located at the amino acid and carboxy termini of the helical protein as well as the direction of the hydrogen bonds in respect to the main axis of the helix

uild Movie Display Setting Scene Mouse Wizard Plugin Help ed helixALEU 33C (pk1) ked helixALEU 33C. ed helixALEU 33C (pk1) ed helixALEU 33CA (pk2) ed helixAARG 30CA (pk3) ed helixATYR 28C (pk4) ced helixAASN 27H (pk1) ced helixAASN 27N (pk2) se File For Evaluation Only (30 days remaining) 2.6 248 20 2.1

What is CaCO 3?

At a certain temperature, the equilibrium constant for the chemical reaction shown is 1.58103. At equilibrium, the concentration of AB is 2.725 M, the concentration of BC is 2.125 M, and the concentration of AC is 0.170 M. Calculate the concentration of B at equilibrium. AB(aq)+BC(aq)AC(aq)+2B(aq)

Calculate the volume, in milliliters, of a 0.380 M KOH solution that should be added to 5.500 g of HEPES (MW 238.306 gmol, pKa 7.56) to give a pH of 7.48. 3D KOH volume mL

Identify amino acids from side chains?

LICK Selector selection sele defined with 21 atoms. You clicked pepHHH 82HG Selector selection sele defined with 0 atoms. You clicked pepGGG 7OH Selector selection sele defined with 21 atoms. PYMOL 6. pep 1 AAA BBB CCC DDD EEE FFF GGG HHH III JJJ No License File For Evaluation Only (30 days remaining) PyMOL W e Type here to search

0.55 g of a compound X is dissolved in 300 cm3 of an aqueous solution. Given that compound X is completed dissolved in the solution and the osmotic pressure (in atm) at 25C of the solution formed is 1.12 atm, find the molar mass of the compound X.

0.0613 kg of biphenyl (C12H10) is dissolve in benzene (CsH6) to create a solution with a total volume of 350.0 mL. (Assume the change in volume is negligible) If the vapor pressure of pure benzene is 24.4 kPa at 40.0 C, then what will the vapor pressure of the solution be in kPa (Consider biphenyl to be nonvolatile and the density of benzene is

Coagulation is the process of stabilization of colloids, by altering surface properties in order to allow the individual particles to combine into larger ones Select one True False

Analyse the structure of the Alkaline Phosphatase enzyme. What is the distance between the metal ion and the phosphate atom O 15.5 A O 12.5 A O 17.5 A 21.5 A

Part A Identify amino acids. What is the correct sequence of the peptide found in pep.pdb O HSMPTWYFKR O RFKYWTPSMH O RMSPTWYKEH O HMSPTWYKFR

Analyse alphahelices in proteins. What is the length of the hydrogen bonds between ARG32H and TYR280 O 1.9 O 1.5 O 1.7 O 2.1 A

Analyse the structure of the Alkaline Phosphatase enzyme. Which other metal ion is located close to the zinc atoms 2 Fe2 O Mg2 Fe3

Analyse betasheets in proteins (para.pdb). What is the total number of strands that connect sheet 2 (residues 5457) with sheet 3 (residues 7578) O 6 strands 4 strands O 7 strands 5 strands

Analyse betasheets in proteins (antipara.pdb). In which direction is each of the three Bstrands running (ie. the direction of the arrow heads in cartoons) O from NC terminus and antiparallel O from CN terminus and parallel from CN terminus and antiparallel from NC terminus and parallel

Analyse betasheets in proteins (antipara.pdb). In which direction is each of the three Bstrands running (ie. the direction of the arrow heads in cartoons) O from NC terminus and antiparallel from CN terminus and parallel from CN terminus and antiparallel O from NC terminus and parallel

Analyse betasheets in proteins (antipara.pdb). In which direction is each of the three Bstrands running (ie. the direction of the arrow heads in cartoons) O from NC terminus and antiparallel O from CN terminus and parallel from CN terminus and antiparallel O from NC terminus and parallel

Analyse betasheets in proteins (antipara.pdb). What is the average lenght of the hydrogen bonds 1.95 A O 1.85 A O 2.05 A O 1.75

Analyse alphahelices in proteins. What it the direction of the hydrogen bonds in respect to the main axis of the helix O 90 degrees from the axis same direction O 120 degrees from the axis O 150 degrees from the axis

Analyse the structure of the Alkaline Phosphatase enzyme. What are the 3 amino acids that coordinate the metal ion in the active site of the enzyme O ASP42, SER155, GLU311 O ASP39, SER155, GLU311 O ASP42, SER155, TYR100 ASP42, CYS155, GLU311

Analyse betasheets in proteins (para.pdb). What is the total number of hydrogen bonds that connect sheet 2 (residues 5457) with sheet 3 (residues 7578) 5 hydrogen bonds O 4 hydrogen bonds O 3 hydrogen bonds O 6 hydrogen bonds

Analyse alphahelices in proteins. What is the identity of the residues that are located at the amino (N) and carboxy (C) termini of the helical protein ASN and SER O TYR and SER ASN and PHE O GLY and CYS

Hlachons 2. Give the Poduct of the following ca) (5x210) HNO3 (b) L CHcla koH (4) So, cl, 30c (e) Q Non NHOH 3. Deunbe the fanatin g Triglycende uningchemical Yeachim. C5 manks)

Which product is obtained from the following reaction 1) Mgether 2) Do Br 3) H2OH HO. HO, II II IV O a. I and II O b. II O c I O d. I . IV