Chemistry Questions and Answers May 24, 2020

Given the valence configuration, identify its quantum numbers. The first item has been answered as your guide mi ms 2p 1 12 3s 4s 4p5

1. Answer the following question (a) Estimate carbon dioxide content of a natural water sample having a pH of 5.5 and bicarbonate ion concentration (HCO3) of 28 mgL. Assume temperature is 25C and KA1 4.3 x 107. (b) If the CO2 content was reduced to 3 mgL by aeration, assuming bicarbonate ion is still the same, calculate pH of the above sample.

An acidbase neutralization reaction occurs between 60.0mL of sodium potassium hydroxide, and 60.0mL of nitric acid solution in a lab calorimeter starting at 20.0C. The final temperature recorded is 26.57C. If both solutions have a concentration of 1.00 molL answer the following (do not give units in your answer) 1. What is the energy absorbed by

Explain, with the aid of suitable diagrams, how variations in the potential applied to an electrode leads to the reduction of an analyte at the electrode solution interface.

The UVVisb spectra of salts of the following coordination complexes are determined in aqueous solution. which complex would the spectrum contain absorptions with the greatest emax values Re(OH2)62 O COCI2 COCI42 Rh(OH2)612 ReO4

How is the location of a receptor crucial to understanding the function of a chemical messenger ,OH NH2 OHH N CH H . CH3 Noradrenaline Isoprenaline There are two types of adrenergic receptorthe a and B adrenoreceptors. Noradrenaline shows a slight selectivity for the a receptor. Isoprenaline shows selectivity for the B receptor. Think about the

Give the major organic product of the reactions shown below. (1) B2H6 (a) (2) H2O2, OH (1) B2H6 (b) (2) .2,

The concentration of Argon in the atmosphere is 9340 ppmv. Express this value in terms of the percentage of the atmosphere that consists of Argon atoms, and also in terms of the number of Argon atoms per cubic centimeter of air (assume STP).

4. Explain the trends in the rate constants given in the table below for the following reaction Cr(CO)sL CO Cr(CO)4(CO)L CO PMe,Ph 1.5 x 1010 Br 2.0 x 10 L CO K (s, 30C) 1.0 x 1012 3.0 x 1010 1.5 x 104 4 marks

If the heat exchanger area in Q1 is 200 m2/heat exchanger, the cost law coefficients are a = 30,000 $, b = 400 $, c = 0.9 and hot and cold utility costs are 120,000 $/MW/year and 15,000 S/MW/year, respectively. Take i = 0.1 and useful life of heat exchangers = 5 years. Which design will you select (MER or a non-MER design)?

The criminal justice budgetary allocations have remained relatively static over the years. Your task is to reallocate the budgetary allocations of police, courts, and corrections, to facilitate a criminal justice system best capable of achieving justice. Be sure to justify your reallocations. What would your criminal justice system look like once

The liquidphase reaction I(2A B C D) is carried out in a semibatch reactor The reactor volume is 12 m 3 The reactor initially contains 5 mol of B at a concentration of 0015 kmolm 3 A at an aqueous concentration of 003 kmolm 3 is fed to the reactor at a rate of 4 dm 3 min The reaction is first order in A and half order in B with a specific reac

Start from ethyl acetate (ethyl ethanoate) and synthesize the following compound.

OH

A crystal of Al(OH)3 is very slowly growing in a solution, so that Al(OH)3(s) Al3+(aq) + 3OH-(aq) is essentially in equilibrium. For each of the following changes, discuss if the total mass of the Al(OH)3 crystal will increase, decrease, or remain unchanged. a) The crystal splits into two halves, exposing the core (new surface area) to the

Consider the collision: N 2 (i) + Ar N 2 (j) + Ar where i and j are the vibrational quantum numbers of N 2 . Assume that N 2 is a harmonic oscillator with frequency 7.0810 13 s 1 . If the initial velocity of N 2 has a magnitude of 1.410 3 m s 1 and the initial velocity of Ar has a magnitude of 2.010 3 m s 1 , what is the maximum value of j if:

0.3728, 0.9319, 1.4910 and 1.8638 g aliquots of KCI were dissolved in 4 separate 250 ml samples of distilled water. Calculate H3O and the pH for each of the resulting solutions.

Show the orbital diagram for Strontium, remember to identify the orbital: The energy of the orbital increases down the diagram.

Muestre el diagrama de orbitales para Estroncio, recuerde identificar el orbital La energia del orbital aumenta hacia abajo en el diagrama

Evaluate what drivers would cause you to commit fraud (keep in mind that fraud investigators sometimes have to think like a fraudster to understand the motives, and with this exercise, you have to think like a fraudster here!!!). Based on that evaluation, rank the drivers and the types of fraud you would be willing to commit. Propose a solution

(iii) For the experiment described in (ii), sketch the current potential plot that you would expect to observe when the concentrations of Cu and Zn are equal. (iv) Considering the system described in (ii). If the potential was now cycled in the opposite direction, from 1.0 V to 1.0 V, what would you expect to observe Provide an explanation to

It is raining happily all across Western Washington. A car is proceeding along happily, the driver smoking a cigarette and talking on her cell phone about coming in next week to replace worn tires, when oh no, the car slides and crashes over the curb and into a concrete barrier, causing the oil and gasoline to begin to pour out onto the ground,

6. Complete the following reactions by filling what is left out either the reactants, starting material, or the major product. (5 pts ea) a. b. d. Br 1.tBuOK 2. BH, 3.HO, NaOH 4. PCC 1. Excess NaNH, 2. CH,Br 3. KMnO4, HO 1.NaOMe 2.HO 3.SOCI 4. KOH Page 2 of 2

1. Consider the cubic unit cell of CuzO (a 4.27 A) Assign the red and blue ions as Cu or O, Draw the unit cell with a red ion at the origin. How would you describe this crystal structure in terms of (a) a lattice plus basis, (b) interpenetrating Bravais lattices, and (c) a closepacked array with interstitial sites filled Draw a projection of the

It is likely that income will be overstated. A closer look at inventory levels, including a physical count of inventory and a comparison of inventory and shipping logs. Sales should not be booked if inventory has not been shipped.

A series of anode-supported SOFCs were tested at 800 C. The only parameter that was changed was the thickness of the electrolyte. Data for the cell resistance measured with current interruption are shown in the table. Determine the conductivity of the YSZ electrolyte and the fraction of the resistance that can be ascribed to the interlayers,

Thickness um Resistance (2 cm) 0.100 0.105 0.120 14 20 0.140

Guess the unknown organic compound with the help of the following data and explain it.

IR Spectrum of the Unknown Organic Compound 4000 3000 2000 1500 1000 500 MS Spectrum (El) of the Unknown Organic Compound 20 40 60 80 100 120 140 160 180 200 220 mz 147 149 175 173 188 061 216 218

At elevated temperatures, sodium chlorate decomposes to produce sodium chloride and oxygen gas. 2NACIO3 2NaCI 302 A 0.8758 g sample of impure sodium chlorate was heated until the production of oxygen as ceased. The oxygen gas collected over water occupied 57.2 mL at a temperature of 22 C and a pressure of 97858.6 Pa. Calculate the mass percent of

. CH3 Hexylresorcinol, pKa 9.55, logP 3.77 0 Warfarin, pka 5.87, logP 2.70,You should use reverse phase chromatography to separate the local anesthetic hexylresorcinol and the blood thinner warafin in the same sample (see the structure of the analytes below). As a stationary phase, you have a C18 column, and the mobile phase you use is an

A company has 1500 employees and 800 of them have completed a particular training course. Management decides to choose a random sample from all employees. What is the minimum number of employees that must be in the sample in order to use the central limit theorem to approximate the distribution of the proportion in the sample who have taken the

In 2005 , the FTC approved the merger of The Gillette Company with Procter & Gamble. Experts who reviewed the merger said it made sense that it was approved because the two companies had few products in the same market categories. In order to satisfy the government, the companies had to sell only two of their brands to other companies. What

Which of the following bases of product differentiation attempts to create the perception that a firm's products or services are unusually valuable by focusing on links within and between firms? Product customization Consumer marketing Reputation Product complexity

(Exercise 1) (1) Derive the three linear equations between log D and pH of 8hydroxyquinoline, Hox, under the extreme conditions of, (i) H K1 (ii) 1 HKg1 and 1 Ka2H (iii) H K92

Draw the contributing structure that results from resonance indicated by the curved arrow(s). You do not have to consider stereochemistry. Explicitly draw all H atoms. You do not have to include lone pairs in your answer.

Escriba sobre la flecha los reactivos y condiciones de reaccin y luego en los rectngulos la estructura de los intermedios A, B y C que completan la siguiente transformacin. HO. HO, A B C. 5.

A hot metal cylinder initially maintained at 35 C immersed in a pool maintained at 27 C. Take the average convective heat transfer coefficient (h) as 464.58 WmK. After 1.5 seconds, determine the temperature at the center of the hot metal cylinder if the thermal diffusity of the material is 0.042 ms and the thermal conductivity is 140 Wm.K. Please

If the standard quantity (SQ), actual quantity (AQ), standard price(SP), and actual price (AP) are 350 units, 400 units, $12, and $13 respectively, then the total budget variance (or, that is, the flexible budget variance) is _____. a. $1,000 favorable b. $250 favorable c. $250 unfavorable d. $1,000 unfavorable

Balance the chemical equation below. If you were given the number of grams of AICI3 and asked to determine how many grams of KCl could be produced by its complete reaction, what steps would you need to follow to determine this AlCl3 K2SO4 Al2(SO4)3 KCI

The number of sodium, ions resulting from dissolving 8.5 g of sodium nitrate (NaNO3) in water is .. ions a) 6.02x103 b) 60.2x 1023 c) 0.602x1023 d) 6.02x1023 ,The total number of ions resulting in the solution of previous problem is ..ions a) 6.02 x 1023 b) 60.2 x 1022 c) 12.04 x 1023 d) 1.204 x 1023

Question

A sample of sodium hydroxide was exposed to atmospheric air for a short time while it absorbed carbon dioxide gas, when analyzed it is found that it contains 10 p.p.m of sodium carbonate, i.e. every kilogram of sodium hydroxide sample contains .... sodium carbonate. b) 10 g a) 10 mg c) 100 mg d) 100 g

If one mole of potassium sulphate is dissolved in water and it was completely ions. ionized, the number of potassium ions in the solution equal c) 1x6.02x1023 a) one b) two d) 2x6.02x1023

1) The monoatomic ideal 1mol He gas is suddenly isothermally compressed to P 2 = 3atm when P 1 = 2atm pressure and V 1 = 10 dm 3 volume. Then it is compressed adiabatically reversibly to a pressure of 5 atm. a) Draw the P-V diagram of this process and explain each stage by showing the isotherms. b) Calculate the exchange of heat and work in each

Graduate education is designed to transform the way students view their personal and professional worlds. After reviewing the website about this program, what is it about its mission that appeals to you? Talk about how it will bring you closer to achieving personal and/or professional goals. Please be specific. As an adult student, you will likely

The number of neutrons in C-14 is The number of neutrons in I-131 is The number of electrons in I-131 is What is the name of an isotope having 29 protons and 23 neutrons? Write the elemental symbol and mass number of this isotope. What is the charge on an ion with 15 protons, 16 neutrons and 18 electrons?

Lennard Jones potential diagrams, also called intermolecular potential energy diagrams, illustrate the relationship between the potential energy of a molecule as the distance between the two nuclei changes. Select all of the true statements regarding Lennard Jones potential diagrams from the list below. As the internuclear distance decreases, the

Thinking about location decisions, what would be the principal criteria that might be used for locating each of the following facilities (you can use bullet points such as good roads, parking, etc in your answers as they should be selfexplanatory to me when reading your thoughts

How much electricity (in kWh) would be needed to produce the hydrogen to power a hydrogen-fuel cell car for the same total vehicle km as one liter of petrol in a typical conventional car? Assume: a. 63.0 kWh of electricity is required to generate 1 kg of hydrogen a high-pressure electrolyzer and pressurized to 350 bar suitable for onboard storage

A schematic catalytic cycle is shown below, based on rhodium phosphine complexes, with the ligand donor atoms denoted by P ( phosphine), and X and Y as other ligands. The local point symmetry at Rh is also given. The cycle is monitored by solution phase Raman spectroscopy. Rh P XRh 1 C2v Cs XRh Rh 4 D3h 3 C, (a) USE THE METHOD OF UNSHIFTED BONDS

Respond to the following questions using the modified GRASP method, complete sentences andor simple diagrams and illustrations whenever necessary and warranted. Pay attention to the mark value of each question. Remember to show all your work. ,1. An important step in the synthesis of nitric acid is the conversion of ammonia to nitrogen monoxide.

The 0.1 M NaOH was titrated against another sample of 1.025 g of KHP 20 m Question 8 Calculate the concentration of NGOH obtained from this titration of 32 KHP. Question 9 Calculate the average NaOH concentration from both 33 titrations, Use this average value for your further titrations in this lab.

Two dimensionally identical containers are connected to each other by a pipe with a diameter of 3 cm. Container A initially contains water but container B is empty. The cross-sectional area of each container is 4 m 2 . If the viscous effects are negligible, determine the time needed to empty container A completely. FIGURE P5113

0.7 m 2.5 m B 0.5 m

Alex wants to measure the nominal 1998 GDP of $993 billion in 2008 dollars. From the data he gathered, he knows the deflator for 1998 is 30 and for 2008, it is 74, and that real interest in those years was 6.23% and 3.21% respectively. If he avoids making a misleading calculation, what will the value be?

Can someone help me with physics? I would appreciate any help someone can give me. An explanation would greatly help my understanding of the topic. At launch the space shuttle weighs 4.5 million pounds. When it is launched from rest, it takes 8.00 s to reach 163km/h , and at the end of the first 1.00 min its speed is 1630km/h . What is the average

We will evaluate respiration in beans by comparing carbon dioxide production between germinated and n9ngerminated, beans. As shown in the balanced equation for cellular respiration, one of the byproducts is CO (carbon dioxide) CeH20s 6 H20 6 0, energy 6 CO, 6 H20 We will use a carbon dioxide indicator (bromothymol blue) to show oxygen is

Video text description for the Direct Measurement Video of Relationships in a Copper Wire This video shows a simple circuit containing a coil of copper wire. Attached to the left side of the coil is a wire that goes to the negative terminal of the power supply and another wire that goes to a voltmeter. Attached to the right side of the coil is a

Explain how a series of four separate messages would be successfully sent from one computer to another if the first message were transferred without error, the second message were initially transmitted with an error, the third were initially lost, and the ACK for the fourth were initially lost.

At 17 temperature and 870 ml pressure, the volume of the fixed mass in the gas is 76ml. What will be the volume of that gas at standard temperature and pressure.

3. Write a script that prompts the user to enter a vector, named vector1, which has at least 6 elements. Create a new vector, named vector2, containing only the elements in the even numbered positions from vector1. For example, if vector1 is 0 12345 6, vector2 should be 1 3 5). This should work for vectors of any length. So ive by using Matlaland

Use the theory of hybridization to explain the electronic arrangement in 1. C 2 H 6 2. C 2 H 4 3. C 2 H 2 4. CO 5. O=C =O

Show the curved arrow mechanism in the left box below. In the other two boxes, show both products formed when the anionic species (R)1amino 1iodoethan1olate eliminates a leaving group. Be sure to draw the leaving group in the box on the right.

Write the IUPAC name of the following compounds 1. 2.

(vi) a7 10 PP (i)

Which of these measurements were taken on a device with the highest resolution? Explain. 0.2530 g 150 g 1.30 g 0.00234 g 5843 g

Metal ions give a flame color due to which defect?

(d) By considering a nuclear spin I 32 of a potassium 3K atom, obtain all possible hyperfine states F. Together with all the fine states, j, you obtained in (a), draw all the fine and hyperfine level splitting together.

After your first dilution, you now have 1.5 mL of stock solution available. To perform another procedure you now have to make a 12 dilution from the stock solution while assuring that you have at least 0.5 mL of stock solution remaining (the diluent is water). Using the space below, indicate the volume of stock solution and water you will need to

Assume that you want to construct a voltaic cell that uses the following half reactions: A^2+(aq) + 2 e^- A (s) Ered = -0.10V B^2+(aq) + 2 e^- B (s) Ered = -1.10V You begin with the incomplete cell pictured below, in What voltage will the cell generate under standard conditions? Express your answer using two decimal places.

You work for a medium-sized IT firm and your boss mentions that recently a number of employees have received calls from individuals who didn't identify themselves and asked a lot of questions about the company and its computer infrastructure. At first, he thought this was just a computer software vendor who was trying to sell your company some new

At what temperature velocity of sound in nitrogen gas will be equal to the velocity of sound in air at 25 C? (Assume that air contains 79% nitrogen and 21% oxygen.)

Which of the following is true about capital gains? a. For 2017, long-term capital gains are subject to special tax treatment. b. Net short-term capital gains are not netted with net long-term capital losses. c. Short-term capital gains are not netted with other capital gains and losses. d. Long-term capital gains are never taxed. e. None of these

Bioremediation was selected to clean up 1000 m 3 soil contaminated with 1000 mg/kg n-nonane (C 9 H 20 ), 1000 mg/kg toluene (C 7 H 8 ), and 2000 mg/kg benzene 1,2-diol (C 6 H 6 O 2 ). The soil bulk density is 1,800 kg/m 3 . (A) Estimate the average chemical structure/molecular formula of the contaminants (20%) (B) Determine the most appropriate

Among the three pictures A, B, and C. which of the following will best represent. 1. An atom Why 2. A cation Why 3. An anion Why NG EDUR TARAN negative charge no charge potive charge protons electrons elections electrons protons protons www.godol .co BA

A double replacement reaction between lead(IV) nitrate and sodium chloride will produce lead(IV) chloride and sodium nitrate. If 1.02 moles of lead(IV) nitrate is reacted, how many grams of sodium nitrate will be produced

Draw the important resonance structures for each of the molecules below. Use curved arrows to show the movement of electrons. Include formal charge when appropriate. Assign partial charges to the parent molecule based on the important resonance structures. Identify any electrophilic atoms (E) or nucleophilic atoms (Nuc) based on your assignments.

calculate HCl acid volume requirements in propagation wormhole by the following methods (a)Daccords model (b) the volumetric model when a 28wt%HCL is used to propagate wormholes 3ft from a 0.328 ft radius wellborn in a limestone formation specific gravity 2.71 with a porosity of 0.15.the design injection rate is 0.1bbl/min-ft, the diffusion

List only classes for which evidence is given here. Attach no significance to evidence not cited explicitly. Do not over-interpret exact absorption band positions. None of your inferences should depend on small differences like 10 to 20 cm -1 . 1) The functional groups in an organic compound can frequently be deduced from its infrared absorption

The following diagram shows one way to link the concepts related to ionic bonding. Fill the box with concepts related to ionic bonding.

3. Give the IUPAC name for each compound. (a) CH3NHCH2CH3 (d) N (b) CH3 (e) N. (c) CH2CH3 () CH3 N. CH3 H2NCH2CH2CHNH2 HIN

plastic jar with lid powdered laundry detergent cooking grease or shortening Materials water Procedure 1. Fill the jar with water about half full. 2. Add some laundry detergent and shake the jar until the solution is soapy and bubbly. 3. Drop a small glob of grease and put it in the soapy solution. 4. Observe what will happen to the grease when

The following organometallic compounds are stable and have a second row transition metal at their centre. Find out the metal and its formal oxidation state. Ph CF3 PhPMPCys AR HA Ph Ph OC CO OC D A B

Using the ACDLabs NMR simulator (once in the simulator, use the help Help menu at the top to access full instructions), complete the table below by indicating splitting patterns and integration for the three compounds that are provided. Drag the appropriate labels to their respective targets. singlet doublet triplet quartet quintet sextet septet

The titration of 25 mL of pyrimidine 0.0836 mol / L (Kb = 1.69 x10) with HCl 0.1067 mol / L. Tit ration reaction: CHN + H CHNH. a) calculate the pH when the volume of acid added is 4.63; 19.60 and 25.00 mL; b) Sketch the titration curve using the data found in item an as the basis; c) If the concentrations of the reagents involved were less

To find the average molecular weight value (Mn) of a polymer with a known heterogeneity index of 2, 0.10 grams of polymer was dissolved in 100 mL cyclohexane and the flow time was found to be 140 seconds in 34.5 celcius ubbelhode capillary viscometer. Since the polymerization degree of polymer is known to be 410, find the molecular weight of the

2. Propose a reasonable structure for the compound whose Hmr, Cnmr, IR, and mass spectra are shown. Explain (in numbered steps) how you solved the problem, and then indicate how each of the spectra is consistent with your structure. ,CDCI, 8.0 7.5 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 8 (ppm) Integration numbers (relative number of protons)

Could someone help with this please! Thanks (a) Design a synthesis of the following compound from uncharged, metal-free compounds containing up to five contiguous C atoms and no elements other than C and H , and any other reagent containing up to three contiguous C atoms . You may also use any reagents from the reaction conditions menu. Pay

HC OH S CH CH

Reaction of (CH2CH2)2RHCI2 (A) with two equivalents of a phosphine ligand under nitrogen results in displacement of ethylene by phosphine. With triethylphosphine, the reaction yields a dimer, RhCl(PET3)22.(B). With PrP, a monomeric N2 complex is formed, RhCl(N2)(PPr3)2.(C). Draw structures of A, B and C. Explain why different results are seen with

Adrug is allowed to diffuse through a cellulose membrane. At steady state, the flux (J) was found to be 5.73 x 10 gmcm.sec and the concentration gradient (dCdx) was found to be0.72 gcm. The drugs diffusion coefficient (D) is Oa. 0.13x 10 cmsec O b. 7.96x 10 cmsec O C 0.13x 10 cmsec O d. 7.96 x 10 cmsec ENG 1212 PM

Ba is more active than Fe, and Fe is more active than Pd. Which of the following reactions will not occur a. Pd(s) FeSO4 (aq) PdSO4(aq) Fe b. Fe(s) PDSO4 (aq) FeSO4(aq) Pd O c. Fe(NO3)2(aq) Ba(s) Ba(NO3)2(aq) Fe O d. Ba(s) PdCI(aq) Pd(s) BaCl,(aq)

Identify the incorrect statement below concerning an aqueous solution which is 0.2 M NaCl solution a. This solution is a homogeneous mixture of ionized NaCI and H20. O b. This solution has a high electrical conductivity. O c. In this solution water is the solute. O d. The solvent is the dispersing medium, which is the substance present in greatest

Calculate the resulting molarity of a solution prepared by mixing 30.0 ml of 0.18 M NaF and 50.0 mL of 0.10 M NaF. a. 0.072 M O b. 0.08 M O c. 0.28 M O d. 0.13 M

An aqueous glucose solution is 15 glucose by mass. What is the mass of glucose present in 225 grams of solution O a. 33.75 g O b. 225 9 O C. 191.25 g o d. 32 9