Chemistry Questions and Answers June 14, 2020

A solution is made by mixing 50 grams of CHCI3 (liquid) with 10 grams of CH2CI2 (liquid). Which of the two is considered the solute and why Neither is the solute because they are both liquids at ambient conditions and therefore are solvents. OCHCI3 is the solute because it is in the greater amount. CH2CI2 is the solute because it is in the greater

How many moles of Ca(NO3)2 are there in 7.5 L of 0.25 M solution (a solution with .25 moles per liter).1.88 O 18.8 mol O 3.33 mol O 1.88 mol 0.0033 mol 0.0188 mol

Hg undergoes electron capture. Write a balanced nuclear equation for this process. 80 201 80 Hge TI 202 81 O 201 80 201 Hge Au 81 201 Hg e 80 201 81 O 201 80 202 Hge 79 Au O 201 80 201 Hgje 79

Complete the following reactions. No explanation needed.

MgBr I Et20 2. Haot HID4 Socla , Pyr oH 1TSCI, Pyr 2. NaSCHy

Complete the following reactions. No explanation is needed.

MgBr I Et20 2. Haot HID4 Socla , Pyr oH 1TSCI, Pyr 2. NaSCHy

Fill in the table below:

(10 ) (catalyst) Dimethyl Bis(2,4,5 trifluorophenyl) methanone 3,6 bis(dimethulamino) 2,7difluoro10 methylacridin 9(10H)one Formamide (DMF) MW (gmol) Mass (g) 290.12 73.095 331.4 3.44 Volume 4 4 (mL) Density, p (gmL) 0.948 mmol Eq 1

Beta particles pose the greatest danger if we ingest food that contains compounds that emit beta particles. O True O False

What is the relationship between Rf and the polarity of the stationary phase? What is the relationship and between Rf Polarity Mobile Phase ? and

Increasing polarity of the stationary phase will Decrease Rf value increase Rf value affect movement of the mobile phase has no effect on movement of the sample

A pentagonal decomposition level f 5 affected by the disturbance of H, so if all the elements of the correction matrix are equal to zero and that H11 H220, H33H44H55A and H24H42C where AC Write the matrix of correction elements for this level, then discuss the state of decay for this level before and after the perturbation occurs, then plot the

Which of the following is correct? If H < 0 and S > 0, then G is < 0. If H < 0 and S > 0, then G is = 0. If H > 0 and S > 0, then G is < 0. If H < 0 and S < 0, then G is > 0.

Regarding electrochemical characterization and segregation of Ni2+ ion in aqueous solutions, analysis both graphs below by using Cyclic voltametric data.

Cyclic Voltammograms Cyclic Voltammograms 0.006 0.006 0.004 0.004 0.002 0.002 4. 0.002 0.002 0.004 0.004 0.006 0.006 0.008 0.008 Potential vs. AgAGCI (V) Potential vs. AgAgCI (V) DI as recved stiiring DI PH stiiring KCLPH stiiring NICI2 stiiring 0.001 NICI2 stiiring 0.01 Nia2 Stiir ing 0.1 Current (A)

Start with a cup (C of 56 JK) with 2795 ml of water at a temperature of 10 C. How many grams of hydrogen would you have to burn to make the final mixture 65 liquid water and 35 steam

La condensacion aldlica de 3metilciclohexanona conduce a una mezcla de dos productos enona, sin contar los ismeros con enlace doble. Favor de 1. Presentar la reaccin con los productos principales va el aldol. a. Primer producto 5 pts b. Segundo producto 5 pts 2. Indicar el mecanismo de cada uno de los productos principales. a. Mecanismo primer

Show how you would synthesize octan2one from each compound. You may use any necessary reagents. a. heptanal b. oct1yne c. 2,3dimethylnon2ene

Give the reaction sequence to form lidocaine starting with 2,6-xylidine, and name the mechanisms involved.

Start Virtual ChemLab and select the Synthesis button at the top left. After entering the synthesis laboratory, select Esterification from the chalkboard. Your target compound is the preparation of isopentyl acetate using the Fischer Esterification. Use the available reagents on the stockroom shelf and identify the appropriate starting materials

Give the reaction that occurs when HCl is added to lidocaine.

Complete the reaction and also give mechanism.

OH DMSO, (COCI)2 ETZN, CH2C1, low temp.

A model of a cycloalkane appears in the window below. ball stick labels ,Which of the following also represent the molecule shown in the model (Select all that apply.) CH2 CH CH2 CH2 CH2 CH2 CCHCH2CH3 CH ,A model of a cycloalkane appears in the window below. ball stick labels in ,Which of the following also represent the molecule shown in the

For Figure 1, If there is no Error 1 Calculate (CH) Concentration in mgL unit Draw the ion balance diagram Calculate Ca(HCO3) Mg(HCO3)2, and CaSO, concentrations in meqL Unit 2 3 Figure 1 Calcium Magnesium CO Hardness Alkalinity HCO,1 so, Q1 K1 Ions Na1 2 Hardness CH 170 mgL as () 50 145 Concentration 11.0 27.37 mgL as (CACO3) 60 mgL as () 6.9

An ion exchanger of the sulfonated type was eluted with sufficient quantity of sodium chloride solution, then a component having the formula ROK (Raromatic structure), was introduced into the column. What would be the formula of the component after it passes the column. Explain your (( expectation in detail with equations.

The following Absorbance vs concentration of nitrite graph is obtained for a set of data Absorbance Vs Concentration y 1.6628x 0.0373 R2 0.9893 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0.2 0.4 0.6 0.8 Concentration of nitrite (mgL) Determine the concentration of unknown solution for which the absorbance is determined as 0.69 A. More data is required .

2. 4. 6. 7. 10. 11 PH 2.13. 2.17 15. 2.21 2.34 2.46 2.68 2.96 8. 9. 11.76 478 11.33 11.59 12. 1172 13. 11.84 11.92 12.00 Volume 5mi 5.5ml 6m1 6.5m1 701 7.5ml 8ml 8.5ml 9m1 10mt 13 ml 19 m. 15m APH 7 0.04 0.04 0.13. 0.12. 0.22 0.28 1.82 698 043 026 0.13. 0.12. 0.08 Average volume 5.25 11.5 6.25 675 7.25 7.75 8.25 8.75 9.25 105 115 12.5 13.5

Write a Quality Assurance guide for the analysis of one of the following samples; both samples are suspected of having a drug, but have not undergone any testing as of yet: A bag containing 100 grams of white powder suspected to contain a controlled substance (drug) OR 100ml of human urine suspected to contain a controlled substance (drug)

Use this 3-phase diagram to answer

Fo 3 1500 1 160 forsterite En 13 An 1400 anorthite notati 1400 1500... 21000 cristobalite 5 1700 Qz a) Draw the isotherm section at T 1400 oC, write the stable phases (specify bond lines) b) Draw the cooling diagram of the points in the given triple diagram. The cooling diagram will be drawn on the horizontal paper in such a way that the cooling

In the IR spectrum of the DES choline chloride urea, identify the bands related to c holine and the band related to urea and identify the bands that suffered greater frequency deviation or change in bandwidth in the DES spectrum in relation to the spectrum of the pure component. ATR Transmission 1000 0,6 500 0,4 0.2 0,0 4000 3500 3000 2500 2000

1. For each compound below, state the specific class of biomolecules to which it belongs. (For example, glucocerebroside is more specific than sphingolipid, which is more specific than lipid.) (16 pts 2 ea.) a) b) c) d) e) f) g) h) HO 2. For each fatty acid below, categorize it via lipid numbers (e.g. 160, 181cA9) and, when appropriate, Qx

Calculate the ortho para product ratio for each of the four reactants (toluene, ethylbenzene, cumene, and tbutylbenzene). Discussion Based on the data, is there a trend in the ortho para product ratios as the substituent on the benzene ring changes Use chemical reasoning and data to support your claim.

find all zebra values for the linear approximation on the wooden cart more information given below mass=4000T w = 235rpm L=48m salon constant S=5.4 here basic medium is used where the concentration of NaOH2 is 5.44g/mole and molality is 4 moles per liter.sc4

Complete the following table for the synthesis of ethyl butanoate (pineapple) Name- Butyric acid -Ethanol -Sulfuric acid -Butanoate ethyl Formula molecular P. M. g / mol Mass (g)moles Density Volume (mL)P.E. o C

Parte C. Complete la siguiente tabla para la sntesis del butanoato de etil (pia) H2SO4 H20 Nombre cido butrico Etanol cido sulfrico Butanoato de etil Formula molecular C4H8O2 C2H60 H2SO4 P. M. gmol 88.11 46.07 98.07 Masa (g) moles Densidad gmL 0.964 0.789 1.84 Volumen (mL) P.E. C 163.5

3.4. A gas oil has the following TBP distillation data Volume TBP (C) 216 243 268 0 10 30 50 70 90 95 100 284 304 318 327 334 It also has an average boiling point of 280 C and an average density of 0.850 gcm. (a) Split this gas oil fraction into five pseudocomponents. Calculate Te, Pe and for each pseudocomponent. (b) Calculate T., P. and for the

Given the data, fill in the molarity of the substances below.

Table 1. Summary of Preparation of Solutions for Each Run Volume (mL) (in beaker) (2 decimal places) Volume (mL) (in flask) (2 decimal places) Total Volume Run after mixing Stock IO3 Solution DI Water Stock HSO3 Solution DI Water (mL) 1 10 10 5 20 20 5 15 40 4 40 5 35 80 5 5 5 5 20 10 10 15 40 7 15 5 15 40 10 30 5 35 80 35 5 35 80 10 20 20 5 35

2. Compound A gives the following IR spectrum. Upon reaction with sodium borohydride, followed by acid workup, the product B with the H NMR spectrum shown below is formed. Identify the structure of both A and B. Suggest a synthesis for A starting from toluene, alcohols with 3 or fewer carbons and any other common reagents. Wavelength tim) 16 25 2

Suppose you have the following reaction at equilibrium. If the volume of the container is suddenly decreased by half, what will happen to the amount of product C Ae 3B 2C 3De decrease increase stay the same

Chemical equilibrium can be achieved by start a reaction with a. reactants only b. products only c. equal amounts of reactants and products d. any amounts of reactants and products a O a, b. c, d

Calculate the molar solubility of the slightly soluble compound ACI, in a solution of 0.10 M NaCI. K ACI, is 2 x 10 10 ACly A a 2CIag) O 2x 10 M O 2 x 10 M O1x 10 10 M O 2x 10 M

Calculate the molar solubility of the slightly soluble compound ACI, in a solution of 0.10 M NaCI. K ACI, is 2 x 10 10 ACly A a 2CIag) O 2x 10 M O 2 x 10 M O1x 10 10 M O 2x 10 M

Choose an explanation(s) for the formation of a racemic mixture. Both ends of the forming ring can rotate counterclockwise. The compound has plane of symmetry. The compound undergoes disrotatory ring closure under thermal conditions. The compound undergoes ring closure to form cis configuration. Both ends of the forming ring can rotate clockwise.

What is the estimate for the cost of equity? Provide the following inputs that you used and why. Risk premium Risk-free rate Beta of equity for Boeing The case does not give you the RF (Risk-Free) and RPM (Risk Premium on the Market) at the end of 2002. Also, you are not supposed to get this from outside the case. Therefore, use the information

Find the theoretical yield of lidocaine. 15ml of acetic acid, 3ml of 2,6-diethylamine, 25ml of sodium acetate

1. Identify the unknown structure based on the data 2. assign key ion peaks

Auntane Se 1207 tero7 8000000 6000000 4000000 2000000 3.00 320 340 3.60 3 80 4 D0 420 440 4 00 4 80 500 520640 5 00 5806.00 620 6 40 660 6 80 7 00 7 20 740 7.00 7 30 8.00 Teme Abundance Scan 510 (6245 m 320 2000 1800 1000 206.0 1400 1200 1000 B00 600 788 400 105 0 281.0 58.0 134 8 152 2 190.9 176.8 200 119.8 266 8 255.1 120 180 200 220 240 260 280

Calculate the NPV the IRR of introducing the new product (the first task) assuming that the asset class will be closed. Should the company proceed with this project Explain.,Year 1 2 3 4 Unit Sales 3000 5000 6000 6500 5 6000 6 5000 7 4000 8 3000 The beta of this specific project is 2. Steve is not planning at this stage to get debt to finance

(a) The following sets of N2 adsorption data were obtained at 77 K using a commercial rapidadsorption analyzer for three samples (each about 0.25 g) of HZSM5 with SiAI ratios of 12 to 70. From these data calculate the monolayer volume Vm and BET surface area for each sample. Compare the surface areas for the three different samples. Explain how it

A 1.32 g sample of impure magnesium was analyzed by allowing it to react with excess HCl solution. After of the impure metal was treated with 100 ml of 0.750 molL HCI, the remaining solution required 50 ml of a 0,250 molL aqueous sodium hydroxide for complete neutralization. Assuming the impurities do not react with the acid, what is the by mass

major product of the process is H20 N. CH,OH A) HC OH B) C) D) No elimination reaction Ans D

Order of rate of electrophilic substitution reaction is NH NH P Q R A) Q P S R B) Q P R S C) PQ S R D) PQ R S Ans A

The most suitable reagent for performing the following transformation, is CH3 CH3 NH2 A) LIAIH, ) , PdC C) PP3, H20 D) Li, liq. NH3 Ans C

A biochemist wants to determine the effect of an inhibitor on a certain enzyme. The data are shown below Vo (Mmin) (without inhibitor) Vo (uMmin) (with inhibitor) Substrate (HM) 10 13.2 7.9 20 20.9 12.2 40 28.4 17.2 80 36.6 22.1 120 40.2 24.2 o Using linear regression analysis, determine the values of Vmax and Km of the enzyme in the absence of

(a) A newly discovered protein (enzyme A) is 52residues in length and contains a high frequency of Leu and Ala residues. A sample of enzyme A dissolved in water gives amide I band frequencies (deconvoluted) in an FTIR spectrum between 1,654 cm1 and 1,658 cm1. A circular dichroism spectrum of enzyme A exhibits a double minima in the molar

A researcher is attempting to separate a terpene (aromatic compound) present in an aqueous solution. The partition coefficient of that terpene at a particular pH in a chloroformwater mixture is 0.65. A solution that contains 5.2 g of the terpene in 100 mL of water was shaken successively with two 55 mL portions of chloroform. (i) Calculate the

How important is the standard deviation and the confidence interval in any chemical analysis? discuss the importance of performing at least two measurements when performing an analysis method. Present the equations of the sample standard deviation and the confidence interval, comment on each of its terms.

Show how you would make this structure from 1butanol and 2propanol using the Wittig synthesis.

Show how you would make this structure from cyclopentanol.

What are the possible subshells when n = X and how many orbitals are contained by each of these subshells, draw this in detail with an explanation? What are the Possible ml values for l = X? Where the value of X is 5 or 6, which depends on the solution

Explain in detail with example(s) about the groups of elements and their properties. Briefly discuss about trends in the periodic table.

Discuss in detail about Van der Waals forces in molecular structure of compounds

Show how you would make this structure from 1methylcyclopentene. OH OH

Show how you would make 2methylbutanoic acid from but1ene.

Draw the products of these reactions. NH NH, a. b. acid C. N, acid 2 CH, 2 CH,OH d. CN . HCN f. 2 HI

Draw the mechanisms for these reactions. TSOH 6 H20 HCOH acid HONH2 H20

3 Which dorbitals overlap in metals with a primitive structure 4 With thorough explanation, identify acids and bases in the reaction HNO, H2O H,O NO,

1) Using the master equation for the titration of a weak acid with a strong base, construct the titration curve in MS Excel (pH vs Vb) for 50.00 mL of 0.0200 M2(Nmorpholino)ethanesulfonic (MES) being titrated with 0.100 M NaOH. The pka of the acid is 6.27 at 25C.

A reaction of benzene [ 1.5 g ] with 1-chloropropane [1.5 g ] in the presence of AlCl3 yields [1.1 g] product which was subjected to GC analysis equipped with a thermal conductor detector (TCD). The chromatogram obtained shows two peaks identified as n-propyl benzene [area = 67 mm2 Wf -1.09] and isopropyl benzene [area = 105 mm2 Wf -1.06].

Pronde prmaRy organic veachion products por schemeS Shown below. SCHEME1 01)01BALCercess) (2) H3 Ot CH3CH2M9Er (2) H30t 78 C N. 2) H30 catNaOH then Heat 12) Na OH Hz0 sock CH NH2 with no gaid NH3,heat V cat H heat (130) Hz O (C2)

The radioactive decay of Tl-206 to Pb-206 has a half-life of 4.20 minutes. Starting with 1.01 10 22 atoms of Tl-206, calculate the number of such atoms left after 12.60 minutes.

Apply the Gibbs phase rule to determine the number of independent primary reactions needed to calculate the equilibrium composition of the butadiene system at a given T, P, and the initial composition of the reactants. I really like the reaction pathway shown below to demonstrate different aspects of kinetic versus thermodynamic phenomena.

1. Should the calcium oxalate solution be made acidic or basic to achieve the MINIMUM amount of precipitate Provide an explanation and use the following chemical equations and your experimental evidence to help you answer the question. C2042 (aq) H (aq) HC204 (aq) HC2O4 (aq) H (aq) H2C204 (aq) 2. A. After adding the ammonia to the oxalic acid

Draw the structures for a. phenyl acrylate b. oxalyl chloride c. N, Ndimethylformamide d. potassium benzoate e. succinic anhydride

Draw products for these reactions. SOCI, a. NH2 1) LIAIH b. EN 2) H.0 SOCI, CHNH, . HO 1) CH,CH,MgBr d. 2) H,0 e. HO C.

Show how you would carry out the following syntheses. OH a. b.

How would you carry out these transformations OH . b. from HO, and

Give the systematic name for this structure.

Draw the mechanism for the acidcatalyzed aldol condensation of 2 molecules of acetone. (It would go via the enol rather than the enolate.)

Give products. a. 2 o b. C. e. base A BrBr smb H base base NaOCH, NaO CH3

What reactants give this Robinson annulation product

Show how you would carry out these syntheses. a. b. HO.

Octane, C3H18, is the primary component of gasoline. Octane burns in the presence of oxygen according to the following combustion reaction 2 CH18 (g) 25 0, (g) 16 CO, (g) 18 H,0 (g) If 7.0 moles of octane burn in the presence of excess oxygen, how many grams of carbon dioxide, CO2, are produced Note This is a review question that involves

Considering that Rxn 2 is taking place in the cathode while Rxn 1 is at the anode, determine the free energy change in kJ given the following. Please show a complete solution. Note that this happens at a room temp.

A2 (0.59 M) 2e A Ecell 1.70 V 3 (0.41 ) 3 cell 1.49 v 3D

Name the compound. CH3 CH3 CH CCH CHCH,CCH3 CH3 CH3 2,2,6,6tetramethylheptane 2.2.6,6tetramethyl3heptene O 2,2,6,6tetramethyl4heptene O 2,2,6,6tetramethyl3heptyne 2,2,6,6tetramethyl4heptyne

The enzyme phenolase catalyses the browning reaction of fruits and vegetables. This enzyme can be inhibited by sulphur dioxide (SO2). A student was tasked to determine what type of inhibitor SO2 was and they carried out the experiment in the presence and absence of the inhibitor and table D1 shows their raw data. D1a) Help the student using their

The Xray crystal structure of Anadensin was published in 1983. Provide three different types of data learned from the Xray structure that is NOT readily determined by NMR or IR spectroscopy. The figure on the right is an image of the structure without hydrogens added from the Cambridge H H3C Data base. CH3 OH CH3 Anadensin (1) Edit View Insert

Using the thermodynamic tables for standard enthalpy and entropy, calculate standard enthalpy and entropy for the complete combustion of 1,750.0 ml of ethane (C2H6) gas with 750.0ml of oxygen gas as 25 degrees C and 760.00 torr. Using the standard entropy and enthalpy calculate, determine the standard Gibbs Free Energy for the amount of limiting

A) What can you conclude about the relative reactivities of the alcohols? B) Describe the preparation used. Be sure to include any changes made in the scheme presented in the discussion

Table 1 Properties of esters Boiling point (ester) Boiling point (alcohol) Name Formula Fragrance isobutyl formate HCOOCH2CH(CH)2 raspberries 98 C 108 C

A combustion of 3.87mg sample of a certain vitamin that contains C, H and O gave 5.80mg of CO2 and 1.58mg of H2O. Calculate the percentage composition of C, H and O in this vitamin.

The following chemical formula is typical of: Select one: amino acid protein sugar fatty acid

Draw the product for each of the following electrocyclic reactions. Using wedges and dashes, indicate the stereochemistry. If more than one stereoisomer is produced, draw both products.

C Heat

Draw the product for each of the following electrocyclic reactions. Using wedges and dashes, indicate the stereochemistry. If more than one stereoisomer is produced, draw both products. Heat

What is the molarity of 10% NaOH solution? (Assume density of water is 1.00 g/mL.)

Calculate the mass of sodium carbonate needed to react with the amount of sulfanilic acid you were given. 1 mole of sodium carbonate will react with 2 moles of acid. sulfanilic acid given = 4.284

Drop Menu #1 (The intermediate below is involved in the...) - Tranesterification Step - Electrophilic Aromatic Substitution Step - Dehydration Step Dropdown Menu #2 (Completion of tbis step will involve...): - Protonation of Oxygen 1 - Protonation of Oxygen 2 - Protonation of Oxygen 3 - Protonation of Oxygen 4

draw out the mechanism for the Pechmann condensation reaction of resorcinol and ethyl acetoacetate to form 4methyl7hydroxycoumarin. Question 2 6 pts The intermediate below is involved in the Select step. Completion of this step will involve ( Select 1 HO, HO O 2

On excel how can I fit a logistic regression model using simple linear regression model as the structure for the linear predictor please explain with formulas to use not solve and how do I know if the regression model is sufficient load (x) sample size n number failing r 4578 82 19 3656 77 44 4171 85 29 2395 99 48 2960 78 49 3070 93 49 4709 63 26

Calculate the mass of sodium carbonate needed to react with the amount of sulfanilic acid you were given. 1 mole of sodium carbonate will react with 2 moles of acid. sulfanilic acid given = 4.284

Calculate the mass of sodium nitrite needed to react with the amount of sulfanilic acid you were given. (1:1 mole ratio) sulfanilic acid mass = 4.284g

Draw the complete catabolic pathways for the following amino acids Glycine, Glutamate, Glutamine, Serine, Aspartate, Asparagine, Arginine, Alanine, Proline, Valine, Isoleucine and Lysine

5.25 mL of concentrated hydrochloric acid is added to 30 g of crushed ice. How many moles is this?

The half esterhalf chloride derivative of succinic acid can be made. If one equivalent of diethylamine were added (along with pyridine to neutralize the acid produced), what would be the product Explain your reasoning. base NH