Chemistry question and answers for October 03, 2023
- Q From an initial mix of: 2 mol Cl2, 1 mol Br2, 1 mol I2, 1 molCl−, 1 mol Br−, & 5 mol I−; the total quantity ofBr2  present after all possible...
- Q Determine the percent ionization of the following solutions ofphenol at 25°C:(a) 0.795 M_____%(b) 0.280 M_____%(c) 1.57×10−6M_____×10_____%(Enter your answer in scientific notation.)
- Q give the steps for the enantioselective synthesis of(L)-tyrosineand another for (D)-tyrosineboth starting from the corresponding (Z)-enamido acid and usinga rhodium as a catalyst
- Q Elemental Composition Problem: Pick one sample of any substancein the world and explain the elements involved with that substance.Do not pick an organic molecule because they are well known tocontain...
- Q The value of the universal gas constant is 0.082 (Latm)/(mol K) or 8.31 J/(mol k) and 1.00 atm = 760 mmHg or 760torr.When a sample ofH2​​​​O​​​​​​​​​​​​2is decomposed, 350 mL of...
- Q Which of the following 1M solutions will have the highestconcentration of ions?A) Na2[CdCl4]B) K3[V(C2O4)3]C) K2[MoOCl4]D) [Co(en)2(C2O4)]ClE) [Zn(en)2]Br2
- Q 1. Carry out the following calculations, expressing each resultwith the correct number of significant figures:?a) 16.421 g + 0.050 48 g = ?gb) 4.6742 g / 0.003 71 L =...
- Q Naphthalic acid, a large organic molecule, is found to have thefollowing composition: C, 66.67%;H, 3.73%;O, 29.60% by mass.Determine the empirical formula of this compound.B. Given that the molar mass of...
- Q 1. Sulfanilic acid (NH2C6H4SO3H) has a pKa of 3.23. How manygrams of Na(NH2C6H4SO3) [182.1 g/mol] would you have to dissolve in125 mL of water to get a pH of 7.97?a....
- Q Please answer these TRUE or FALSE questions.1. True or False. The Born-Oppenheimer approximation accountsfor scattering.2. True or False. Tunneling is one way to approximate thesolution to the Free Particle.3. True...
- Q 1. Calculate the solubility ofPbI2 in units of both moles xliters-1and g x(100mL)-1 using your average KspvalueAverageKsp= 7.40x10-7                                    2.     Explain why the solid PbI2 does not appear in theequilibrium expression for...
- Q In a0.57mMaqueous solution of trimethylacetic acidC4H9CO2H, what is the percentage of trimethylacetic acid that isdissociated? You can find some data that is useful for solving thisproblem in the ALEKS Data...
- Q The intermediate product of a chemical process is a chemicalpaste that is saturated with water. The paste is rolled into a thinlayer and placed to dry in a flat area...
- Q What is the pH of a solution made by mixing 500 mL of 1.00 M HCNand 1.50 L of 0.250 M NaOH, and then diluting the entire solutionto a volume...
- Q A hot air balloon of 25 m in diameter has a mass of 95 kgincluding its cage when empty. This balloon is accelerating upwardat an acceleration of 1 m/s^2 in...
- Q 4. If I use a catalyst,a. how will it change the reaction?b. if it is an equilibrium reaction, how will it change theequilibrium constant?5. What happens to the equilibrium if...
- Q Post-Lab Questions: Answer. 1. What should you examine todetermine the precision of your results? Explain. 2. What shouldyou examine to determine the accuracy of your results? Explain. 3.If the standardization...
- Q Determine the molar solubility of AgBr in a solution containing0.150 M NaBr. Ksp AgBr = 7.7x10-13
- Q 1a)Â Â From the volume of titrant added, calculate themoles of vitamin C for each titration. Show a sample calculationfor trial 1, and then just state the final results for thecalculation of...
- Q For the diprotic weak acid H2A, Ka1 = 2.2 × 10-6 and Ka2 = 8.4 ×10-9. What is the pH of a 0.0600 M solution of H2A? What are theequilibrium...
- Q A 10-L drum of ether at 18C is open to the atmosphere (p=760Torr) and contains 6-L of liquid. The top is sealed and the drumdented so that it now has...
- Q How does the absorption capacity of the regeneratedactivated carbon compare to that original activated carbon? Explainwhy there is a difference.
- Q Part (a) The cyclopentadienyl anion (C5H5 - ) is commonly usedaromatic ligand. The secular equations for describing theinteractions of the five unhybridized p orbitals lead to a matrixof the form:(...
- Q Solve an equilibrium problem (using an ICE table) to calculatethe pH of each solution:Express your answer using two decimalplacesa) a solution that is 0.170 mol L−1 inHC2H3O2 and 0.125 molL−1...
- Q what are some weak acids and weak bases? and how do conjugate acidsand bases work? how do i find what is a buffer and what is not abuffer?
- Q Complete, balance, and write the net ionic equations for thefollowing reactions: Also classify each reaction, giving itstype.Al (s) + Fe(NO3)2(aq) → Type ofreaction __________Na3PO4 (aq) + Ba(NO3)2(aq) → Type of...
- Q In the article Tooth Decay: A Delicate Balance, we learn thattooth decay occurs when the equilibrium between mineralization anddemineralization becomes unsteady, according to this equation:Ca5(PO4)3(OH) ↔ 5 Ca2+ + 3...
- Q 2.Calculate the pH of a solution made by mixing 50.00 mL of0.100 M KCN with 4.33 mL of 0.425 M strong acid HCl. HCN pKa =9.21.
- Q You think you have a receptor with three identical andindependent ligand binding sites that came about from trimerizationof monomeric receptors. If you knew what the signal was for bindingto one...
- Q Mustard gas, used in chemical warfare in World War I, has beenfound to be an effective agent in the chemotherapy of Hodgkin'sdisease. It can be produced according to the following...
- Q Show the math of ATP production/ consumption in glycolysis.
- Q Post-lab Question #1: While both NaBH4 and LiAlH4 can both beused toreduce ketones and aldehydes, the procedure that youfollowed in lab wouldnot result in the fluorenol product if NaBH4were simply...
- Q What is a cofactor? Give one example in the glycolysis pathwaywhere a cofactor is involved.
- Q Question:1Calculate the density, in g/cm3, of a metal that hasa volume of 41.3 L and a mass of 70.05 kg.Question:2You have 20.0 L of a 8.18% by volume (% v/v),...
- Q A river is contaminated with 0.65 mg/L of dichloroethylene(C2H2Cl2). What is the concentration (in ng/L) of dichloroethyleneat 21 C in the air breathed by a person swimming in the river...
- Q A 18.6 mL solution of 0.100 mol L-1 NaOH is titrated using 0.150mol L-1 HCl. What is the pH of the solution after 15.3 mL of theHCl solution is added?
- Q What is the fraction of HA dissociated at a pH of 6.10 if Ka =1.8 x 10-5? 0% 4% 100% 96%Which of the following is true about the shape of...
- Q 1. (3) Acetone is a more polar solvent than diethyl ether. Withreference to the structures and specific functional group(s) ofeach molecule, why is cholesterol more soluble in acetone thanlecithin is?2....
- Q You are trying to find an appropriate solvent to use as a TLCmobile phase. Pure hexanes hardly move your sample from thebaseline. Preferably, you would like to bring this sample...
- Q For each reaction write a balanced chemical equation and thenbelow the chemical formula of each reactant and product write abrief description of the substance (color and physical state).Also, indicate whether...
- Q The reaction of the persulfate ion with the iodine ion at roomtemperature is:         S2O82-    +      2I-         ↔      2SO42-      +      I2      ,    so  rate = k[S2O82-]x[I-]yThe following data was collected at room temperature:Experiment[S2O82-](M)[I-] (M)Initial Rate (M/s)10.100.152.61 x...
- Q 2. A 155 g sample of iron metal at 120.0C is placed into 250.0g of water at 20.0 °C in a calorimeter. When the system reachesthermal equilibrium, the temperature of...
- Q A protonated histidine residue in the active site of aspartatetranscarbamoylase, ATCase, is thought to be important instabilizing the transition state of the bound substrate.A) Sketch a graph showing the pH...
- Q Consider the combustion of hydrochloric acid. 4 HCl (aq) + O2(g)ïƒ 2H2O(l) + 2 Cl2(g) ΔHrxn = + 96.976 kJ/molB.If you place 750 mL of 0.500 M solution of HCl...
- Q Suppose that you have to balance the following half-reaction inbasic solution.Cr2O72??(aq) ?Cr3+?(aq)What is the coefficient on water of the final balanced half-cellreaction?A) 5B) 6C) 7D) 8
- Q 7. Consider the titration of 100.0 mL of 0.120 M HNO2 titratedwith 0.100 M NaOH. Determine the pH after each of the followingsituations. Show your calculations explicitly.a.) No base has...
- Q In the pentose phosphate pathway draw out all the structures,with names, enzymes and cofactors, encountered in the conversationof glucose-6-phosphate to ribose-5-phosphate
- Q 1. What is the pH of a solution with 15 mL of 0.5 M acetic acidand 15 mL of 0.5 M sodium acetate in solution.2. What is the pH if...
- Q QUESTIONS TO ANSWER:1-What is the role of the silica gel beads in the reactionsetup?2-What is the byproduct of the reaction if the Grignard reaction ifthese silica beads weren’t there?3-The sulfuric...
- Q compare the two element boron and copper its group for instance =first ionisation energy (FIE)the trends decrease down thegroup
- Q Initial rate data for an enzyme that obeys Michaelis-Mentenkinetics are shown in the following table. When the enzymeconcentration is 3 nmol ml−1, a Lineweaver-Burk plot of this datagives a line...
- Q The “impure†phthalic acid was mixed with a known (to theinstructor but not the student) amount of resorcinol. Can youdetermine the amount of resorcinol (percentage) contained in theimpure phthalic acid...
- Q The absorbance of a 1 mg/ml sample of lysozyme was measured in acuvette of thickness 1.00 cm and was found to be 3.19 at 240 nm and2.58 at 280 nm....
- Q What are the new chemical equations when each one isindividually added to the equation Fe3+ + SCN-<--> FeSCN2+?There should be 8 new equations. One for each chemical that isadded to...
- Q You have 420 mL of an aqueous solution that is 0.39 MNa2SO4 and a separate 185 mL aqueous solutionthat is 0.45 M BaCl2.a). How many moles of each of the...
- Q Find the Algebraic answer,absolute uncertainty, and relative uncertainty of:log [8.47(+/- 0.05)]I'm having difficulty finding the uncertainty of logarithms andexponents, so showing work would be much appreciated!
- Q a. when 0.10 mol of the ionic sold NaX, where X is an unknownanion, is dissolved in enough water to make 1.0 L of solution, thepH of the solution is...
- Q Using a symmetry-based approach, construct a complete molecularorbital diagram for OH2. (a) Indicate the HOMO and LUMO. (b) Draw arepresentation of the HOMO and LUMO. (c) If one were to...
- Q Draw the more stable chair conformation of the followingmolecules, and esti- mate the amount of strain in each:(a) trans-1-Chloro-3-methylcyclohexane(b) cis-1-Ethyl-2-methylcyclohexane(c) cis-1-Bromo-4-ethylcyclohexane (d)cis-1-tert-Butyl-4-ethylcyclohexane
- Q Calculate the molar solubility of HgBr2(Ksp= 5.6 x 10-23) in the followingsolutions. Be sure to state and justify any assumption you make insolving the problems. Be sure to correct for...
- Q ifthe temperature of the column in HPLC was to increase by <1degree celcius, what effect would this have on the data?why do the mean and standard deviation differ betweendifferent concentrations...
- Q Describe the process that takes place between the participantsin the neutralization reaction between the strong acid hydrochloricacid, HCl(aq), and water insoluble chromium(III)hydroxide, Cr(OH)3(s), forming water andchromium(III) chloride, CrCl3(aq). Mention thenature...
- Q If you combine 330.0 mL of water at 25.00 °C and 100.0 mL ofwater at 95.00 °C, what is the final temperature of the mixture?Use 1.00 g/mL as the density...
- Q Study dehydration synthesis and hydrolysis. Why are thesereactions called dehydration synthesis if dehydration means toremove water and synthesis means to build? What do you thinkhappens to large molecules during hydrolysis...
- Q A materials scientist has created an alloy containing aluminum,copper, and zinc, and wants to determine the percent composition ofthe alloy. The scientist takes a 12.232 g sample of the alloy...
- Q Draw the Lewis structure for CH2MgBr and give the formal chargeof each atom
- Q In addition to maintaining pH, another important considerationwhen generating a buffer is the ionic strength of a buffer. Theionic strength refers to the number of ions in a solution. Ionshelp...
- Q Name and describe at least two instruments that can detect traceamounts of metal elements in a sample.
- Q Explain why one can obtain eigenfunctions for the Hamiltonianoperator for the H atom, but can only obtain approximatewavefunctions for multi-electron atoms.
- Q 8. The two methods of determining pH values (pH indicatorversus pH meter) should showsimilar pH values for those solutions. What wasdifferent?
- Q Consider the titration of a 44.3 mL sample of 1.145 M HC2H3O2with 0.52 M NaOH. Ka(HC2H3O2) = 1.8x10-5Determine the pH at the equivalence point. Enter to 4 decimalplaces.
- Q Is there any other way we could obtain the concentration of theprotein fractions other than using Bradford assay?(Hint: Fluorescent proteins)
- Q State the Born-Oppenheimer approximation and describe how itsuse simplifies the description of Hamiltonian operator for quantumchemical calculations. [4 Marks]By describing the underlying principles of Hartree-Fock theoryand density functional theory, briefly...
- Q If a buffer solution is 0.160 M in a weak acid (Ka = 1.0 × 10-5)and 0.470 M in its conjugate base, what is the pH?
- Q Sulfurous acid (H2SO3) hasKa1 = 1.500 × 10-2 andKa2 = 1.000 × 10-7. Consider thetitration of 60.0 mL of 1 M sulfurous acid by 1 M NaOH and answerthe following...
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