Chemistry Questions and Answers June 28, 2020

There is a saponifier which has an inflow of 100Kmol H of Ca (OH) 2, 88.36 Kmol H with propylene chlorohydrin, 5.64 Kmol H of HCIO, 2Kmol h of propylene diochloride and 94Kmol h of HCI. The saponifier has an output of 173.2 Kmol h CaCl2 and 6 Kmol h Ca (OH) 2 of waste. As a product, the saponifier has a flow of 4.418 Kmol h of propylene

Give ONLY the formula of a compound which will a)dissolve AgCl, but not MgCl2 b)dissolve Pbo , and also Ag,0 c)dissolve Al , but not Mg d) dissolve Zn(OH)2 and Nio but not Ca(OH)2 e)give ppt.with Co(NO)2 and also with Ba(NO)2 soln.

11.4mg solid NaBH4 + 0.33 mmol ketone = 45.2mg product (mix of isomers)

Calculate the percent yield for the reaction. Be sure to show your work.

Cr(OH)3 has a Ksp of 7*10^-31. It is soluble in HCl. What is the Keq?

For 0.05M NaOH calculate a) value of regulatory capacity b) what pH causes when 0.05mmol of HCl is added to 500ml solution

Consider SF2 molecule, which has nonlinear bent geoemtry. a) What is the point group of this molecule b) Draw the normal modes of SF, using the arrow notation and label them according to the irreducible representations. c) Which of the normal modes are IR active d) Which of the normal modes are Raman active

Explain and Illustrate the elimination reaction of serotonin.

A solution containing Cd2 was analyzed voltammetrically by the standard addition method. Twentyfive milliliters of a degassed solution, which was 1M HNO3, produced a net limiting current of 1.78 A at a working electrode of a mercury film at a potential of 0.85 V (against a saturated calomel electrode). After the addition of 5.00 mL of a standard

Consider the following balanced equation: 3H 2 (g) + N 2 (g) 2NH 3 (g) If you react 6.0 L of H 2 gas with 3.0 L of N 2 gas at 1 atm and 600K, how many L of NH 3 would you produce?

a) What would be the electron pushing mechanism for the transformation of Meldrum's acid into A? b) What would be the electron pushing mechanism from A to B? c) What would be the electron pushing mechanism for step ii of B? d) What would be the electron pushing mechanism of 4-hydroxycoumarin into warfarin?

H2SO4 phenol HO, HO H2SO4 (cat) H20 PhO A A B Meldrums Acid i. PCI3 ii. AICI3 OH i. Ph Ph ii. H20, H2SO4 warfarin 4hydroxycoumarin (Coumadin)

The stream of air and gasoline vapor, in the ratio of 14:1 by mass, enters a gasoline engine at a temperature of 300C and leaves as combustion products at a temperature of 7900C. The engine has a specific fuel consumption of 0.3kg/kWh. The net heat transfer rate from the fuel-air stream to the jacket cooling water and to the surroundings is 35kW.

Which one of the compounds in Figure 1 is the major organic product of Reaction 1 Click here if Figure 1 and Reaction 1 do not display correctly. Reaction 1 H20, excess NaOH, excess Cl2 Figure 1 OH CI CI CI CI Compound A Compound B Compound C Compound D O Compound A O Compound B O Compound C O Compound D

Give the sequence of reactions that produce 2bromo4ethylaniline from aniline. Draw the structures of the starting material, the first product and the final product, including all reactants used.

Enter your answer in the provided box. In preparation for a demonstration, your professor brings a 1.50L bottle of sulfur dioxide into the lecture hall before class to allow the gas to reach room temperature. If the pressure gauge reads 655 psi and the lecture hall is 22C, how many moles of sulfur dioxide are in the bottle In order to solve this

Complete the equations.

2. continued AICI, e) H,O, heat f) CH100 Pd(PPh)4 (cat) Na, CO, H Br h) a) Ag,0, NAOH, H,0 HO b) H0 workup OH

What is the molecular formula of a compound with the empirical formula of NaSO and a molar mass of 238 g/mol?

A space probe identifies a new element in a sample collected from an asteroid. Successive ionization energies, in attojoules per atom, for the new element are given in the table. 4 Is 0.507 1.017 4.108 5.074 6.147 7.903 8.294 To what family of the periodic table does this new element probably belong O 18 (8A) 1 (1A) 16 (6A) 14 (4A) 15 (SA) 13 (3A)

1. Given the following notation for an electrochemical cell Pt(s) | H 2 (g) | H + (aq) || Ag + (aq) | Ag(s), what is the balanced overall (net) cell reaction? A. H 2 (g) + 2Ag(s) H + (aq) + 2Ag + (aq B. H 2 (g) + 2Ag + (aq) 2H + (aq) + 2Ag(s) C. H 2 (g) + Ag + (aq) H + (aq) + Ag(s D. 2H + (aq) + 2Ag(s) H 2 (g) + 2Ag + (aq) E. 2H + (aq) + 2Ag +

The following electrochemical cell was set up in the lab Ag(s)Ag(NO 3 )(aq)KMnO 4 (aq), HCl(aq), Mn(Cl) 2 (aq)Pt(s) What is E cell for this galvanic cell? If a more complete description of the cell is Ag(s)Ag(NO 3 )(aq, 0.50 M)KMnO 4 (aq, 0.50 M), HCl(aq, 2.5 M), Mn(Cl) 2 (aq, 0.01 M)Pt(s), Ag(s) what is E cell ? What is the balanced, spontaneous

For the cell shown, the measured cell potential, E cell , is 0.3587 V at 25 C. Pt(s) | H2(g,0.849 atm) | H+(aq,? M) || Cd2+(aq,1.00 M) | Cd(s) The balanced reduction half-reactions for the cell, and their respective standard reduction potential values, E, are 2H+(aq)+2e H2(g) E=0.00 V Cd2+(aq)+2e Cd(s) E=0.403 V Calculate the H + concentration.

For the cell shown, the measured cell potential, Ecell, is 0.3605 V at 25 C. Pt(s) H, (g, 0.881 atm) H(aq, M) Cd (aq, 1.00 M) Cd(s) The balanced reduction halfreactions for the cell, and their respective standard reduction potential values, E, are 2 H (aq) 2 e H, (g) E 0.00 V Cd2(aq) 2 e Cd(s) E 0.403 V Calculate the Ht concentration. H

For the cell shown, the measured cell potential, Ecell is -0.3719 V at 25. Pt(s)|H(g, 0.865 atm)| H(aq, ? M) || Cd(aq, 1.00 M) | Cd(s) The balanced reduction half-reactions for the cell, and their respective standard reduction potential values, E, are 2 H(aq)+2e - H(g) E=0.00 V Cd(aq)+2e - Cd(s) E=-0.403 V Calculate the Hconcentration.

A solution of 0.1 L of 0.3 M Ca(NO3)2 is mixed with 0.2 L of 0.06 M NaF. Calculate the reaction quotient Qsp. Does calcium fluoride precipitate? (Ksp (CaF2) = 3.2 1011). (A) Qsp = 1.6 104; no precipitate. (B) Qsp = 1.6 104; a precipitate will form. (C) Qsp = 3.2 1011; no precipitate. (D) Qsp = 3.2 1011; a precipitate will form. (E) Qsp = 3.2

If a solution containing 63.00 g of mercury(1I) nitrate is allowed to react completely with a solution containing 17.796 g of sodium dichromate, how many grams of solid precipitate will be formed mass How many grams of the reactant in excess will remain after the reaction mass Assuming complete precipitation, how many moles of each ion remain in

A 185.0 mL solution of 2.714 M strontium nitrate is mixed with 215.0 mL of a 3.460 M sodium fluoride solution. Calculate the mass of the resulting strontium fluoride precipitate. mass: g Assuming complete precipitation, calculate the final concentration of each ion. If the ion is no longer in solution, enter a 0 for the concentration. [Na+]= M

Find the concentration of calcium ions in a solution made by adding 3.50 g of calcium fluoride to 750ml of .125M NaF. Ksp for CaF2 is 3.95x10^-11

For each reaction below, identify the atom oxidized, the atom reduced, the oxidizing agent, the reducing agent, the oxidation half reaction, the reduction half reaction, and then balance the equation by the method of oxidationreduction showing all electrons transfers. Ze 1. Mg 2HCI MgCla H2 43 1 13 2 22 2. 2Fe 3V0s FeOs 6vo ZFe Fez 32 2 24

For each reaction below, identify the atom oxidized, the atom reduced, the oxidizing agent, the reducing agent, the oxidation half reaction, the reduction half reaction, and then balance the equation by the method of reactions. All are in acid. CIO - + C 12 H 22 O 11 Cl - + CO 2

For each reaction below, identify the atom oxidized, the atom reduced, the oxidizing agent, the reducing agent, the oxidation half reaction, the reduction half reaction, and then balance the equation by the method of oxidation reduction showing all electrons transfers. 1. Mg 2HCI MgCl, H, 2. 2Fe 3V,0, Fe,O, 6VO KMNO, KNO, 2H,SO, MnSO,

The budget director of Heathers Florist has prepared the following sales budget. The company had 270.000 in accounts receivable on July 1 Heathers Florist normally collects 100 percent of accounts receivable in the month following the month of sale. Required a. Complete the schedule of cash receipts by filling in the missing amounts. b. Determine

Calculate equivalence point volume Calculate pH at the following volumes of acid added 12 10.0 mL 10 25.0 mL Equivalence point 50.0 mL 6. 4 r 60.0 mL Check your answers against the titration curve 0 10 70 20 30 40 50 60 Vol 0.10 M HCI (ml.) example Titration of 100.0 mL of 0.05 M NH3 with 0.10 M HCI Hd

Calculate the pH at the equivalence point when 25 ml of 0.10 NH3 is titrated with 25 mL of a 0.10 M HCl solution (KaNH4 + is 5.6 X 10 -10 ).

c. A 75.0-mL volume of 0.200 M NH 3 (Kb = 1.8 x 10 -5 ) is titrated with 0.500 M HNO3. Calculate the pH after the addition of 15.0 mL of HNO 3 . Express your answer numerically. d. A 52.0-mL volume of 0.35 M CH 3 COOH (Ka = 1.8 x 10 -5 ) is titrated with 0.40 M NaOH. Calculate the pH after the addition of 19.0 mL of NaOH. Express your answer

A 52.0 mL volume of 0.35 M CH3COOH (Ka= 1.8x10^-5) is titrated with 0.40 M NaOH. Calculate the pH after the addition of 33.0 mL of NaOH. Express answer numerically. (pH=?)

1,3?Dimethoxybenzene (below) is very reactive toward electrophilic aromatic substitution. Draw a complete mechanism for the following nitration reaction making sure you include details of formation of the required electrophile and all possible delocalized structures for the intermediate cation. Provide a brief explanation for why only the pictured

OCH3 HNO3 H2SO4 . OCH3

When the Ag" concentration is 1.34 M, the observed cell potential at 298K for an electrochemical cell with the following reaction is 2.534V. What is the Al concentration? 3Ag+ (aq) + Al(s)_3Ag(s) + Al(aq) Answer: M When the Age concentration is 2.55*10*M, the observed cell potential at 298K for an electrochemical cell with the following reaction

When the Ag concentration is 1.34 M, the observed cell potential at 296K for an electrochemical cell with the following resction is 2.54V. What is the AP concentration 3Ag(aq) A) 3Ags) A(ag) Answer M

The following reaction is best described as NaOEt Br ELOH, heat nucleophilic substitution (SN1) dehydrohalogenation (E1) dehydrohalogenation (E2) nucleophilic substitution (SN2) ,Rank the following alkenes in order of stability, from most stable (left) to least stable (right). 3. 3214 3124 3142 1324

What is the correct IUPAC name of CH 3 -NH-CH 2 CH 3 ? a) N-Methylethanamine b) N-Ethylmethanamine c) N-Ethyl-N-methylmethanamine d) N-Ethyl-N-methylamine

A 50.00 mL sample of a potassium hydroxide is titrated with a 0.8186 M HCI solution. The titration requires 27.87 mL of the HCI solution to reach the equivalence point. What is the molarity of the KOH solution

1-

In the following reaction KMNO4 NazCz04 H2SO4 CO2 MnSO4 NazSO4 K2SO4 H2O What is the mean oxidation cell i What is the reduction halfcell What is the value of the equilibrium constant K Is the process spontaneous (MnO4) Mn 0 1,51 V (C204) . b. CO2 50 0,49 V .

Aerosol containers are dangerous if they get hot because they can explode. Suppose a container of hair spray, with a pressure of 4.0 atm at a temperature of 25 C, is thrown into the fire. If the temperature of the gas inside the aerosol reaches 402 C. What will your pressure be? The aerosol container would explode if the internal pressure

The calibrator in a 12 L compressed oxygen tank measures a pressure of 3 800 mmHg. How many liters would that same gas occupy at a pressure of 0.75 at constant temperature.

The following compound is identified as OH a) Anhydride b) Phenol c) Amide d) Lactone

The following compound is identified as H2OH OH H OH a) Amide b) Ester c) acid chloride d) Hemiacetal

1- When n-butanol chloride reacts with NH3 is it produced? a) amino butanoate b) butyrolactone c) butanamide d) butylamine 2- It is a six-membered heterocyclic amine: a) Pyrrole b) Pyrimidine c) Quinolidine d) Indole

Claisen condensation occurs when an ester undergoes nucleophilic substitution resulting in the formation of: a) beta keto esters b) alpha-beta unsaturated aldehydes c) unsaturated alpha-beta esters d) alpha-beta unsaturated ketones

Which of the proposed reagents can convert pnitrobenzoyl chloride to p nitrobenzophenone O,N a) 03 b) Pt, H2 c) Na2Cr207 d) Benzene Alc13

Write the name of the products of each of the reactions that occur of p-nitro benzoic acid with each of the following reagents: a. LiAlH4, then H3O + b. H2, / Pt.

1. Secondary alcohols are oxidized to ketones when LiAlH4 is used as the oxidizing agent. a) True b) False 2. Acid chlorides are usually synthesized by treating carboxylic acids with Thionyl chloride? a) True b) False 3. Propylamine is the amine that is obtained by the Hofmman degradation of butanamide a) True b) False

for the balanced chemical reaction, how many moles of Na2SO4 are formed when 1.22 mol of O2 react 4NaOH(aq)+2S(s)+3O2(g)--->2Na2SO4(aq)SO4(aq)+2HO(l)

How many grams of NH3 will be produced when 33.9 mol of H2 are reacted according to this chemical equation. N2+3H2=2NH3

What functions are there in the mazeAsn4 module: print_maze(maze) Description: This function displays the maze. The accessible cells are labelled G i.e. green, the blocked cells are labelled R i.e. red, and the null cells are labelled Y i.e. yellow. The argument maze is a string over an alphabet set G, R, Y that encodes the cell labels of the

Bromide can be determined by precipitating as AgBr, heating in a current of Cl2, and weighing the resulting AgCl. What would be the gravimetric factor for finding the percentage of bromine?

1- A 2-L flask is filled with propane gas (C3H8) at 1 atm and -15 C. What is the mass (in grams) of the propane in the flask?

2- A sample of nitrogen gas is stored in a 500 mL flask at 108 kPa and 10 C. The gas is transferred to a 750 mL flask at 21 C. What is the pressure of the nitrogen in the second flask?

1- A gas sample occupies a volume of 0.185 L at 10 C. What volume will the gas occupy at 20 C?

If 9.26 g of Au is deposited at the cathode, calculate the volume (in liters) of O2 generated at 23C and 747 mmHg.

The extraction of zinc by carbothermic reduction of zinc oxide sinter at 1100C can be represented by the reaction Zno(s) C(s) Zn(g) CO(g) Calculate the heat of this reaction at 1100C, given AH298 (kJmol) Ttransformation () AHtransformation CP (Jmol1K1) (kmol1) ZnO(s) CO(g) C(s) Zn(s) Zn(1) Zn(g) 348.1 49.0 5.10x103T 9.12105T2 110.5 28.4

Write the valencebond wavefunction for the resonance hybrid HF H F H F (allow for different contributions of each structure). Write the valencebond wavefunction for the resonance hybrid N2 N N N2 N2 structures of similar energy.

Discuss the role of the BornOppenheimer approximation in the molecularorbital calculation of a molecular potential energy curve or surface.

Before doing a calculation, sketch how the overlap between a 1s orbital and a 2p orbital directed towards it can be expected to depend on their separation. The overlap integral between an H1s orbital and an H2p orbital directed towards it on nuclei separated by a distance R is S (Ra0)1 (Ra0) 13 (Ra0) 2 eRa0. Plot this function, and find the

The data in the table below were obtained during a determination of lead in lake water by atomic absorption spectrometry (show calculations for the following questions) Lead concentration, mg/L 0.0 2.0 4.0 6.0 8.0 10.0 Absorbance, A 0.002 0.150 0.294 0.434 0.570 0.704 a. Assuming a linear relationship between the variables, find the least-squares

Five gross samples were determined for a carload of limestone. The average percent MgO values for the gross samples were found to be 49.53, 50.12, 49.60, 49.87, and 50.49. Meanwhile, the following results were obtained for the determination of magnesium in a NIST magnesia sample MgO 50.33, 50.22, 50.36, 50.21, and 50.44. Calculate the relative

You are determining mercury in plants by spectrometric procedure. Seven prepared blanks gave the following readings 0.12 0.18 0.25 0.11 0.16 0.26 0.16 What is the detection limit if a 1.0 ppm mercury standard solution gave a reading of 1.25 (put only the value, example, 0.001)

A solid mixture weighing 0.548 5 g contained only ferrous ammonium sulfate hexahydrate and ferrous chloride hexahydrate. The sample was dissolved in 1 M H,SO,, oxidized to Fe3 with H,O2, and precipitated with cupferron. The ferric cupferron complex was ignited to produce 0.167 8 g of ferric oxide, Fe,O, (FM 159.69). Calculate the weight percent of

Summarize the process involved when 1 gram of ice at 0 degress Celsius changes to steam or water vapor at 100C. Indicate whether heat is evolved or absorbed.

On a cold winter day when the temp is -10C and the relative humidity is 50%, what is the specific humidity (note. Water vapor capacity is 2g/kg)

Napthalene, C10H8, melts at 80.0C. If the vapor pressure of the liquid is 10 Torr at 85.8C and 40 Torr at 119.3C, and that of the solids is 1 Torr at 52.6C, calculate a) the AHvap Of the liquid, the Tb, and the ASvap at To b) the vapor pressure at the melting point assuming that the meltingpoint and triplepoint temperature are the same, c)

At 25C a solution containing 5.25g of a substance in 150.0 cubic centimetres of solution exerts an osmotic pressure of 400 Pa. What is the molar mass of the substance?

A compound weighing 0.458g is dissolved in 30.0g of acetic acid. The freezing point of the solution is found to be 1.50K below that of pure solvent. Calculate the molar mass of the compound.

A gaseous mixture of two substances under a total pressure of 0.8 atm is in equilibrium with an ideal liquid solution. The mole fraction of substance A is 0.5 in the vapor phase and 0.2 in the liquid phase. What are the vapor pressures of the two pure liquids?

From the following initial rate data, determine the form of the ratelaw expression for the reaction and determine the order of reaction. 3A 2B 20 D B 1.00 x 102 A 1.00 x 102 2.00 x 102 1.00 x 102 Experiment 1 Rate (Ms) 6.00 x 10 Mmin 1.44 x 101 Mmin 1.20 x 102 Mmin 3.00 x 102 2.00 x 102 2 3

At 31.2C, we have the data Compound Vapor pressure, P (mmHg) Propane 1200 nbutane 200 a) Calculate the mole fraction of propane in the liquid mixture that boils at 31.2C under 760 mmHg pressure. b) Calculate the mole fraction of propane in the vapor in equilibrium with the liquid in (a).

1. Given the reaction Fe (s) + HCl (6M) FeCl3 (aq) + H2 (g), the iron with Na = 26 remains in a d 5 configuration, write the quantum numbers for the last electron.

Analyse the compound as complete as possible IR 1H 13C DEPT COSY HMBC HMQC ,Molecule 2A 100.0. 95 90 85 80 446 87 75 70 65 60 1405 26 55 50 T sp03 08 3115.17 45 1109 86 40 860.7 35 801.01 878 70 30 1806 92 1428.35 25 1541 27 716.53 20 15 1351.06 10 1693.47 129261 1280.06 0.0 4000.0 3600 3200 2800 2400 2000 1800 1600 1400 1200 1000 800 600 400.0

What is the greenest route for synthesis, characterization and ligand exchange equilibria of potassium tris(oxalato) ferrare(iii). Including controlling waste and lab protocols

Suggest a synthesis of the following compound by Claisen or Dieckmann condensations. Show all required reagents.

What is the probability of finding a hydrogen electron (n=2, l=1, m l =-1) within three bohr radii of the nucleus?

Construct a confidence interval of the population proportion at the given level of confidence x=120, n=300, 90% confidence The 90% confidence interval is ___, ____ Use ascending Order

Methyl acrylate is polymerized by using potassium tbutoxide (CH3)3CO K as initiator and by using benzyl chloride (C6HSCH2CI) as a terminator. Write down the steps of polymerization reaction

a) Given the training constants and E for FeFe equal to 0.771V Fe Y FeY Fe Y FeY2 KF 1,3 1025 Kp 2,1 1014 Calculate E for the process b) Since the E for the reaction below is 1.25V, calculate the formation constant of ZnY ZnY2 2e Zno) Y

Prepare this compound from methane gas(CH4) Me HO

Draw the steroid aldosterone (shown below) in perspective. O Me H. aldosterone

What reagent is used here and how does the reaction work Br Lou Ho

Which Energy Jump has a Visible wavelength O a.n 6 to 3 O b.n 5 to 2 O c.n 5 to 4 O d.n 4 to 1 QUESTION 21 What solid is formed when Barium Nitrate, Sodium Sulfate. and Sodium Chloride solutions are all mixed together O a. Ba(C2H3O2 )2 O b. BaCl2 O c. Ba(NO3)2 O d. BaSO4

How to read the following chemical formulas

PrzSiz Prz Siz Bo3 PrzSizB PrSiz Co3 PrSizC Prz SizC15 Prz SizC, PrzSizC3

What is the resolution of a chromatography column that has a length of 15 cm, a diffusion coefficient of 0.0018 cm/min, a linear flow rate of 1.55 cm/min, a relative retention of 1.11, and a capacity factor for compound A and B of 4.84 and 5.33, respectively?

4. A mass of mercury occupies 0.750 L. What volume would an equal mass of ethanol occupy? The density of mercury is 13.546 g / ml and the density of ethanol is 0.789 g / ml. a. 0.0437 L b.0.0777L c. 12.9L d. 22.9L 5. When two materials have different densities like water and oil, they find a. they exchange densities b. they will mix uniformly b.

In isothermal process, U=0, means q=w, but all heat can't be converted into work as it violates 2nd law, explain?

The free energy of mixing (per mole of lattice sites) of a polymer (B) solution in A (according to the Flory Huggins model) is RT * [phi_{A} * ln(phi_{A}) + phi_{a}/s_{y} * ln(phi_{a}) + chi*phi_{A} * phi_{s}] Plot the critical parameters ( phi A,c , phi B,c , chi c ,T c ) for the solution as a function of the degree of polymerization S_{B} .

Calculate the volume of 47 g of acetic acid at 20 C ( = 1.05 g / mL).

A gold bar is 2.31 cm long, 1.48 cm wide, and 0.0758 cm thick. If the density of gold is 19.3 g / mL, what is the mass of the gold bar?

How many calories does a piece of chocolate cake contain 34 g of carbohydrates, 8 g of fat and 5 g of protein.

Calculate the kcal that a celery stick gives off when burned in a calorimeter. It gives off energy to heat 505 grams of water from 25.2 to 35.7 C.

A 25 g sample of an alloy at 98 C is placed in 50 g of water at 15 C. If the final temperature reached by the alloy and the water is 27 C. What is the specific heat of the alloy?

Please show the mechanism for the synthesis above.

OTBS OTBS OTBS c) NiCl,6H20 NABH4 a) Pd, dppf, 14, OTBS PhCI, 130 C b) TBSCI 85 20 g scale TBSO 69 o,H HO 8 g scale (see Table S1) 13 16 O 15 17 3 g scale 33 42 9 OTBS d) LHMDS PHNTF2 e) Pd), 10 , H 68 (2 steps) gram scale 18 TBSO ,OTBS OTBS OTBS c) NiCl,6H20 NABH4 a) Pd, dppf, 14, OTBS PhCI, 130 C b) TBSCI 85 20 g scale TBSO 69 o,H HO 8 g scale

reaction of benzoquinone with cyclopenta-1,3-diene gives

Reaction of alkenes with acetic acid in presence of chloroform

Why is it in some cases that there is no polaron transition evident in a conducting polymer?