Chemistry Questions and Answers June 29, 2020

For the reaction 2 HBr(g) H2(g) Br2(1) A G 103.5 kJ and A H 72.6 kJ at 270 K and 1 atm. This reaction is (reactant, product) fill in the blank 1 favored under standard conditions at 270 K. The entropy change for the reaction of 2.49 moles of HBr(g) at this temperature would be . ,For the reaction 2 HBr(g) H2(g) Br2(1) A G 103.5 kJ and A H

Identify (circle) the oxidizing agent in each of the following redox reactions Zn (s) F, Zn 2 F a. b. 2 HBRO Mn 2 Br, (1) MnO, 2 H Complete and balance the following redox reaction in an acid solution MnO, (aq) CI (s) Mn (aq) Cl, (g)

A sample of fluorine gas has a volume of 5.88 L at 12C and standard pressure. What will be the pressure in atm if the moles of gas and the temperature do not change but the volume is expanded to 9.55 L atm

an Draw the mechanism for the transformation in an acid medium dimethyl pyrophosphate with the presence of of isopentenyl pyrophosphate in enzyme with an acid hydrogen. Why is this step necessary Is product formation favored hoff wit 00 EH Oe E enzyme isopentenyl pyrophosphate dimethyl pyrophosphate

Synthesize the following molecule. All carbons in the molecule must come molecules containing from 5Cs or less and be nonionic.

Give a mechanism for the following reaction. cat. Au HO ELOH OEt

Outline the important interactions between the alkyl oxygen lone pairs and the carbonyl group in esters, sketching the orbitals involved. Use this to account for the different outcomes observed when esters A and B are heated with benzylamine. Ph NH2 OH Heat N Ph A Ph NH2 No Reaction Heat ZI

Below are two views of an A,B,y compound crystallizing in a hexagonalclose packing (hcp) array of B. What is the stoichiometryformula of this compound a. AB b. AB2 c. AB3 O d. A2B e. AsB

Draw the stepbystep mechanism of the following hydrolysis of nitrile compound in acidic and basic conditions to synthesize the carboxylic acid compound. a. H,O b. NaOH, H,0

Write complete mechanism for the following reactions 1.) HO 2.) CH, HCI

Sketch the TemperatureMolefraction phase diagram of the system KappaLambda given that the two substances do not form a compound with each other, that Kappa freezes at 80 C and Lambda freezes at 10 C, and that an eutectic is formed when the mole fraction of Lambda is 0.10 and that the eutectic melts at 90 C.

In a CE system, a value of ueo of 9.1 x 104 cmVs was determined with a borate standard at pH 9.0. With 20 kV applied over the entire 60 cm column, iodate has a mobility of 4.20 x 104 cmVs. What is E for this system What is the migration time for iodate

A gas mixture initially containing 80 CO, 0.4 COS, and 19.6 inert constituents (by mole, mole fraction) is passed over sponge Cu at 1100 K to remove sulfur by the following reaction. COSg) 2 Cu(s) COg) Cu2S(s) 3D Information C(s) 02(g) S2(g) COS(g) C(s) 02(g) CO(g) 2Cu(s) S2(g) Cu2S(s) Fe(s) S2(g) FeS(s) AG202,8009.96 T (J)

Through the use of a mechanism, identify the product of the reaction below. Include any mechanisms for the formation of reagents. Be sure to explain any selectivity observed. NO2 CO,Me (PHCO2)2, A BuzSnH R

Suggest mechanisms for the following CP ..NR Zr. Cp RNC Zr. CH2 H CP CP Me CP ...Me Zr Zr Co Me Me CP CP CP Cp. CO Zr. Zr Cp Ph CO2 2 O Zr Ph Cp

Provide the correct IUPAC name of the polyfunctional compounds (if you can, please explain) 4. CH C CH coci CH, 5. C1 CH, C CH CH, OH 6. 7.

Provide the correct IUPAC name of the polyfunctional compounds (if you can, please explain) 4. CHDC CH, 5. CI CH,C CHCH, OH 7. oue H. 6.

The purpose of this assignment is to apply KNearest Neighbor (KNN) classifier learning techniques to realworld data using data mining tools. Using the dataset below, classify the new record (10) using k 9 Record 1 2 3 4 5 6 7 8 9 10 Age 22 33 28 51 25 39 54 55 50 66 Marital Single Married Other Other Single Single Single Married Married Married

If the Keynesian government spending multiplier is 8, how much do households save from every extra dollar of additional income O 0.10 O 0.125 O 0.25 O 0.875

Amblake Co. offers a $500 prize to employees who have completed a voluntary survey to help them gather information about employee engagement . Indicate if bonus is taxable or not A. It is not taxable since the prize is no more $500 B. It is not taxable since it is not related to work C. It is 50% taxable O D. it is taxable

Prepare Form 1040, Sch. 1, Sch. A, Sch. E, Sch. SE and the Qualified Dividends and Capital Gain Tax Worksheet for 2021 for Ryan and Rebecca Reed. No other forms are required. Although these forms will reference other form numbers, those other forms not listed above are NOT required. In addition to the above listed forms, the computation of

Company Centennial has two divisions. The forcasted details of operations is shown below for the upcoming month. Division A Division B Location Tax rates Variable costs per unit Transfer price (internal) Selling price Fixed costs Units transferred internally (no ending inventory for both divisions) Canada Ireland 45 100 25 80 280 100,000 3,000

Provide a synthetic route for the following compound from benzene and any other necessary organic and inorganic reagents. List the required reagents and conditions for each step and draw the product for each step. (4 pts) OH Br

Draw a detailed, viable, stepwise mechanism for the reaction shown below. Be careful with your use of mechanism arrows. Show each protonation- deprotonation step (proton transfer) in full detail.

NaOH, H20 H. HO,

The protein content of wheat flour can be determined with reasonable accuracy using the gravimetric factor 5.700.01. A 2.060.01 g sample of flour was taken through a Kjeldahl procedure and the ammonia produced was distilled into 50.00.1 mL of 0.16000.0001 M boric acid solution which required 34.70.1 ml of 0.1740.002 M HCI for titration to the

part A QNoComplete the Seqjuences A caO . CHO A 7 H30 CHaCla H30 LAH 2 BnclNgaH 20g DME, NADH H3o NH CH TEA LHMDS THE 2 phCHaCl CoHs CHz OH Cot3 CHq OH Part B propese the mechanisms for BAydroxy conjugate Kebne trested with methyl amine in given greadtion ature Ho

17. Determine the enthalpy change for the oxidation of ethanol to acetic acid, CHCH,OH(() 0(g) CHCOOH(() H,0(() given the thermochemical equations below. 1) 2 CH,CH,OH(() O(g) 2 CH,CHO() 2 H,0(() 2) 2 CHCHO(() O(g) 2 CH,COOH(t) A,HP 400.8 kJmolrxn AHP 584.4 kJmolrxn (a) What is the compound that is not present in the target equation (b) To

Cyclohexanol Oxidation (14) Draw the mechanism for the reaction (15) How could 13CNMR be used to monitor the reaction

Show the product of reaction of the indicated ester with LDA, followed by butyl iodide.

tho CH,CH3 1. Provide a correct name for the indicated ester. 2. How many signals would we expect to see in the BC NMR spectrum 3. Show the combination of reagents required to synthesize the indicated structure using a Fischer esterification reaction. 4. a. The indicated ester is submitted to Claisen condensation conditions, using the appropriate

The reaction 2NO 2 (g)+F 2 (g)2NO 2 F(g) has a second order rate law, rate=k[NO 2 ][F 2 ]. Suggest a mechanism that is consistent with this rate law. Express your answers as chemical equations for each elementary step separated by a comma. Identify all of the phases in your answer.

The Rh(I) complex below bears an inflexible ligand, occupying a square plane around the metal center. a) Draw the oxidative addition product of a generic species, X-Y to the complex. What is the new geometry around rhodium? b) Would you expect H 2 or MeI to oxidatively add to the Rh(I) complex? c) What would these results imply about the mechanism

F2 BC Rh N

Substance X is known to exist at 1 atm in the solid, liquid, or vapor phase, depending on the temperature. Additionally, the values of these other properties of X have been determined melting point 5. C boiling point 35. C enthalpy of vaporization enthalpy of fusion 6.00 klmol 34.00 kJmol 2.80 gem (solid) 2.40 gml. (Nquid) density 46. JK mol

Mr. Joyful owes $7899 now and $2162 in 7 months. After rearrangement of payments, he agreed to pay $X in 10 months and $2X in 18 months from now. Determine the value of $X with j12 = 11.51% per annum.

Consider the following Lewis structure (Lewis structure doesnt imply the shape) and answer the questions i H 1. The geometry of the molecule is 2. The hybridization of Cl is 3. OClO bond angle is are 4. The formal charge of Cl is 5. The polarity of the molecule (polar or nonpolar) 6. The number of sigma bonds 7. The number of pi bonds O O

For the reaction at equilibrium, 3Fe(s) 4H2O(g) S FeO4(s) 4H2(g) AH 152kJ Which direction (forward reverse no effect) the system will shift when 1. H20(g) is removed 2. H2 is removed 3. Fe is added 4. System is compressed 5. Temperature is decreased

If a particular glucose fermentation process is 87.0% efficient, how many grams of glucose would be required for the production of 51.0 g of ethyl alcohol (C 2 H 5 OH)? C 6 H 12 O 6 2C 2 H 5 OH + 2CO 2

How does the pH of a bicarbonate buffer solution consisting of 200 ml of 0.1N NaHCO 3 solution and 180 ml of 0.1N H 2 CO 3 solution change if 20 ml of 0.1N NaOH solution was added to this buffer? (Find the delta pH) Ka(HCO 3 -/CO 3 2- ) = 4.27 x 10 -7 .

Rank the following alkenes in order of their stability, Put the most stable first I II III IV O A. IV II O B. IV II OC. II I 1 IV O D.I I III IV

Determine the concentration of the following solutions: a) KOH: pH = 11.89 b) Ca(OH) 2 : pH = 11.68

1. Calculate the pH of a solution whose [H +] concentration is 2 x 10 -4 . 2. Determine the OH- concentration and pH of a 0.001M KOH solution.

1. Calculate the pKa of a nitrous acid solution whose Ka = 4.5 x 10 -4 . 2. A drink has a pH = 3.1. What is the [H + ]?

A substance has a pH = 5.4. What is the [H + ]?

What is the pH of a solution of Ba(OH) 2 0.02 M?

The Kps of strontium oxalate is 5.6 x 10 -8 at 18 C. What is the concentration in g / L?

The truss shown in the figure below is under a linearly distributed load and is subjected to a point load on the right side, while its left side is fixed. Use the finite element method to solve the weak form for the truss EAue dar , n) dr N vo.) 0 (e) subjected to loading as shown in the figure and determine the displacement at the end and

For HI the fundamental oscillation frequency we 2100 cm and the anharmonicity constant Xe 0.0174. Given that Ey We Xe v the energy of the uppermost vibrational level that can be We occupied before dissociation is O 100 J mol 1 O 264 Hz O 30117 cm O 10.5 cm1 s1 O 13500 kJ molr1

Measurements on the electrical resistivity of Au films reveal a three order-of-magnitude reduction in the equilibrium vacancy concentration as the temperature drops from 600 to 300C. (a) What is the vacancy formation energy? (b) What fraction of sites will be vacant at 1080C?

Stella was offered a lease and license agreement to operate a fast-food outlet in suburban Brisbane. Under the agreement, payments were required to be made for a base rent amount of $80,000 per year and a percentage rent amount calculated as 11% of gross sales per year. The agreement included an option to make a fixed upfront payment that would

Diffraction of 1.5406 angstroms Xrays from a crystallographically oriented (epitaxial) relaxed bilayer consisting of AIAS and GaAs yields two closely spaced overlapping peaks. The peaks are due to the (111) reflections from both films. The lattice parameters are a(AIAS) 5.661I angstroms and a (GaAs) 5.6537 angstroms. What is the peak separation

Both Au, which is FCC, and W, which is body-centered cube (BCC), have a density of 19.3 g/cm 3 . Their respective atomic weights are 197 and 183.9. (a) What is the lattice parameter of each metal? (b) Assuming both contain hard sphere atoms, what is the ratio of their diameters?

(a) What is the density of the dangling bonds at the surface of a Si wafer with (100) orientation. (b) What do you feel about dangling bonds at the surface of a thin film? Should they be made inactive somehow for device application or should they be left as they are?

2. Work out the character table for the group C6. Present it in the conventional format, reducing all exponentials to their simplest form. 3. Use the projection operator method to determine the SALCS required for the formation of MCl o bonds by the eight ligands in an Mo2Cls ion of symmetry D4h. 2 3 y 1 Mo 4 X Mo 6. Mo,Clg ion has the form of

A (aq) + B (aq) 2 C (aq) The above reaction comes to equilibrium. The initial concentration of A is 0.100M. The initial concentration of B is 0.150 M. The initital concentration of C is 0 M. The reactants are mixed and the reaction eventually comes to equilibrium. At equilibrium, the concentration of C is 0.160 M.

Based on the K C of the reaction above what will be the final concentration of Cl 2(g) at equilibrium if 2.00 M of PCl 5(g) decomposes? Report your answer to three significant figures. PCl 5(g) Cl 2(g) + PCl 3(g) K C = 33.3

Compare the methyl isocyanide (CNCH3) ligand to CO (carbonyl) with regards to its o donor ability and nbackbonding ability. Discuss. Clearly explain the origin of any differences in metal ligand bonding between the two ligands.

Explain Structure of C9H12 on NMR.

A gas is at 1 atm if the volume of the gas doubles, and the temperature remains constant, what will be the new volume?

A hypothetical element has two isotopes 81 have a mass of 126.1 amu, while the rest are 156.8 amu. What is the atomic mass of this element Answer amu

To determine the amount of iron in a dietary supplement, a random sample of 15 tablets weighing a total of 20.505 g was ground into a fine powder. A 3.116-g sample was dissolved and treated to precipitate the iron as Fe(OH) 3. The precipitate was collected, rinsed, and ignited to a constant weight as Fe 2 O 3 , yielding 0.355 g. Report the iron

1. Decker has a $1,000 loss from an activity in which he materially participates. He has $500 of basis in the activity and his at risk basis is $300. How much of the $1,000 loss may Decker deduct against ordinary income? 2. Hope and Joy formed a partnership by each contributing $3,000. This year, the partnership borrowed $60,000 as a nonrecourse

Which represents the correct order of annual basis adjustments to S corporation basis O a. share of income and gains nondeductible items share of loss and deduction items tax free distributions. O b. tax free distributions nondeductible items share of loss and deduction items share of income and gains. O C. share of income and gains

The following pair HBr NaBr can be 2 points considered as a buffer solution O True False The conjugate base of HCN is 3 points O Strong acid O Strong base Weak acid Weak base

What would be the composition (%w) of a glass-ceramic made entirely of Li2O.Al2O3.4SiO2 (Spodumene)?

Give the Reagents CO2H CH3 Cl

Provide the Reagents HO,C

Provide the Reagents CH2CH3 Br

Give the Reagents CO,H CH3 Cl

Consider the vectors A2.0i4.0jk, B3.0i4.0j 10.0k, C3.0i4.0j. D3.0i4.0j, E2.0i3.0j2.0k, F9.0j. (a) What is AB Give your answer in the form of ai bjck.

A 0.0450 M solution of benzoic acid has a pH of 2.78. Calculate pK, for this acid. What is the percent fraction dissociation benzoic acid

Q 1. i. Describe the dual nature of electrons. ii. Write down the electronic configuration of the followings, Kr ( 36 ) Fe2+ ( 26 ) Cu ( 29 ) Cl- ( 17 ) Q 2. Write short notes on: i. Pauli Exclusion Principle ii. Aufbau Principle

Q 1. Standardization of NaOH solution with standard oxalic acid solution. N.B.: This question must be answered as a lab report. Have to be written: *Theory part * Procedure (step-1 only) * Experimental data * Calculation * Result

A 0.0450 M solution of benzoic acid has a pH of 2.78. Calculate pK, for this acid. What is the percent fraction dissociation benzoic acid

A 0.0450 M solution of benzoic acid has a pH of 2.78. Calculate pK, for this acid. What is the percent fraction dissociation benzoic acid

Part A MISSED THIS Read Section 14.7 (Pages 613 616) A0.116 Mionic solution has an osmotic pressure of 7.9 atm at 27 C. Calculate the vant Hoff factor (i) for this solution. Express your answer using two significant figures. Submit Previous Answers Reguest Answer

1. Show that the operators L. and L 2. Show that the operators L and Z, commute do not comnmute

If 10 mL of Na2S2O3 solution of 0.025 N reacts completely with iodine liberated by Cu2+ present in 25 mL of brass solution. Calculate the weight of the copper in a litre of the solution. Given Eq. wt. of Cu is 63.54. Write the answer without rounding off.

7. Draw curved arrows indicating the movements of electrons between the following pair of resonance structures. Name the pattern of resonance shown. What is the hybridization of the carbon atoms

8. Draw the remaining three resonance structures for the molecule in problem 7 abover

The photoelectron ejected from N2 with a radiation of 58.43nm has kinetic energy 5.63ev. Calculate ionization energy

Consider the following chemical reaction Al2(CO3)3 (s) CO2(g) Al203(s) N The carbon dioxide gas is collected by water displacement in 155 mL. flask at the total pressure of 0.980 atm. at 24C. Calculate the grams of aluminum oxide. The water vapor pressure at 24 C is 24.0 mmHg. Al 26.98 gmole and O 16.00 gmole 3D O 2.05 g O 0.205 g O 0.0311 g O

A. Give the next three numbers in the patterns. Identify which is arithmetic and geometric sequence. Next three terms (6 points each) Arithmetic Sequence Geometric Sequence Common Difference Common Ratio (2 points each) (2 points each) Given sequence 1.3, 8, 13, 18 2. 3, 6, 12, 24 3. 11, 15, 19, 23 4. 2, 6, 18, 54 5. 12, 36, 108, 324

a) Write the onedimensional timeindependent Schrdinger equation. b) Find the value of f(x) when is ddx and f(x) 4xy. 3D c) Define the any one postulate of quantum mechanics.

d) Write the selection rule for rotational spectrum and define the term used there in. e) Calculate the energy (in ergs) per photon for radiations of A 400nm. f) Which of the following molecules exhibit rotational spectrum , , Br, .

g) Define red and blue shifts in UVVisible spectra. h) What is the deBroglie wavelength of an electron travelling at 1 of the speed of light

2. a) With an example prove that Square operator is not a linear operator. b) Define the salient features of the Schrdinger equation. c) Calculate the uncertainty in velocity of a cricket ball with mass 100 gm, if uncertainty in position is 1cm.

d) Two energy levels in a rotational spectrum are separated by 400 nm. What is the energy difference between these levels Express in Joules, ergs and eV. e) Discuss various types of electronic transition. f) What do you mean by operator Discuss the commutative operator.

g) What do you mean by Eigen value and Eigen value function Prove that for operator for (X)sin2x is an eigene value problem and finds it Eigen value. h) What do you mean by Auxochrome and Chromophores

e) What is effect of Conjugation on chromophores f) The vibrational spectrum of HCl gas exhibits an absorption band centered 2,885cm. Calculate the force constant of the bond of HCl molecule. (mass H1.0078u, Cl35.4993u)

Q.3 a) Which type of molecules exhibit infrared spectra Calculate the vibrational energy and force constant of HF if its vibrational frequency is 3.0 x 1014 Hz. b) Prove that the eigenvalues of a Hermitian operator are real.

4. a) The force constant of Br2 is 300 Nm1. Determine its vibrational energy (in Joules and eV), zeropoint energy and vibrational frequency. b) The 1H17F (rigid type) has bond length 0.16nm. Determine its rotational constant in Joules, eV and cm1.

5 a) A cell of 10 mm path length contains ferric chloride solution of 0.002M. An electromagnetic radiation of A 400 nm is passed through it and the absorbance is 0.60. Determine its molar absorption coefficient and transmittance. b) The rotational constant B for HCl is 12.00 cm. Calculate B for HCl and HCl. c) Define LambertBeer law and write the

Derive Schrodinger equation Write its application to particle in one dimensional box. Also prove that this a Eigen value problem.

(ii) On treatment with aqueous sodium hydroxide, disubstitued cyclohexane 1 readily undergoes a ringclosing reaction to form epoxide 3 whereas compound 2 does not. Using appropriate conformational drawings, provide a mechanism which accounts for this observation. Classify the ringclosing reaction according to Baldwins rules. OH Br Br 1 3 (6 marks)

When a metal was exposed to photons at a frequency of 1.47 x 105 s, electrons were emitted with a maximum kinetic energy of 3.70 x 1019 J. Calculate the work function, , of this metal. Jphoton What is the maximum number of electrons that could be ejected from this metal by a burst of photons (at some other frequency) with a total energy of 6.89 x

A 5.50-mole sample of NH3 gas is kept in a 1.85-L container at 309 K. If the van der Waals equation is assumed to give the correct answer for the pressure of the gas, calculate the percent error made in using the ideal-gas equation to calculate the pressure. (Use a = 4.17 atmL2mol2 and b = 0.0371 Lmol1 for the van der Waals equation.)

1) What is the hybridization of the indicated atoms A D Atom A Atom B Atom C 3D Atom D B.

Q1. State the Menderess periodic law. Q2. Write down the defects of Menderess periodic table.

Q1. Write a short note on diagonal relationship. Q2. Why 21Sc is called transition elements but 30Zn is not? Explain it.

Which one of the following peptides is more likely to aggregate in water solution TSCKSSTCCSSKTT GMPILAALGGGPML O EDDEEECSSEDDD KHKRKKFFHKAYRY

Predict the mononitration products of the following aromatic compounds. Circle the answer please! A) m-nitrochlorobenzene B) m-nitroanisole C) o-methylacetanilide

A shotputter throws the shot (mass7.3 kg) with an initial speed of 14.9 ms at a 31.0 angle to the horizontal Part A Calculate the horizontal distance traveled by the shot if it leaves the athletes hand at a height of 2.15 m above the ground. Express your answer using three significant figures and include the appropriate units. d Value Submit