Chemistry question and answers for July 27, 2023
- Q How many spherical nodes and planar (angular) nodes does a 2sorbital have?0, 10, 02, 11, 02, 0
- Q Write an essay in the ethical dilemma of nanotechnology and howtranshumanism/posthumanism are involved
- Q An unknown nonelectrolyte and nonvolatile compound is dissolvedin enough pure water to make 348ml of solution.The vapor pressureabove the solution drops from 198.7mbar to 196.7mbar. When 100g ofthe compound is...
- Q 1-conctruct trans-1,2-dimethylcyclohexane.by means of ringflips, examine the model with the two-CH3 groups axial and the two-CH3 groups equatorial (e,e=equatorial,equatorial a,a=axial, axial)wich is more stable conformation ? explain the answer.Need part...
- Q how would you control the particle size in reversemicelle method?
- Q How many liters of 0.829 M LiOH will be needed to raise the pHof 0.327 L of 5.11 M ascorbic acid(H2C6H6O6) to a pH of11.36?
- Q The answers are provided. Pleaseprovide an explanation/machanism to support the answers. Questions1, 3, 13, 14, 19, 21, 25, 27, 30, 32, 33, 34, 37, 38, 39, 42, 43,44, 45, 46,...
- Q Silver chromate is more soluble in solutions containing some(less than 1 M) potassium nitrate, even though neither potassiumnor nitrate show up in the BCE for the dissolution reactionAg2CrO4 (s) ↔...
- Q N2 + 3H2>>>2NH3Using the equation above, calculate how many grams ofNH3 you would have if you started with 2.37 g ofN2 and 2.37 g of H2?
- Q How the DNA was extracted from the strawberries, what was thepurpose of the soap and salt?
- Q You are a scientist at a reputable lab researching how differentpolyprotic acids affect the pH of a solution. How many equivalencepoints would be visible on the titration curve if you...
- Q 37.0mL of NaOH is required to titrate 70.0mL of 0.155MH3A to the volume where pH=pKa2. What is themolarity of the titrant?
- Q Use the generalized reaction mechanism of photochemicalsmog formation to explain why aldehydes start at a very lowconcentration, build up in concentration until about 2:00 p.m. inthe afternoon, and then decrease...
- Q What is the pH of a solution where the [OH- ] =1.52 x10-13 M?What is the molarity of the OH- ions in 0.040 Mbarium hydroxide, Ba(OH)2?Assume the barium hydroxide is...
- Q Discuss the kinetics of biodegradation of pollutantsin subsurface environments.
- Q Why do we use atomic absorption spectroscopy?
- Q Calculate the value of Eocell for the following reaction:2Co3+(aq) + 3Ca(s) --> 2Co(s) + 3Ca2+(aq) Co3+(aq) + 3e– -->Co(s) Eo = 1.54 V Ca2+(aq) + 2e– --> Ca(s) Eo =...
- Q Which statement is NOT correct?A. You can increase entropy and still have aspontaneous reaction.B. If there is a decrease in the energy of the system,the reaction is spontaneous.C. Spontaneous reactions...
- Q Describe the kinetic differences between an uncatalyzed secondorder chemical reaction and an enzyme catalyzed reaction.
- Q Imagine that you are attempting to determine theconcentration of an acid by titration with a solution of sodiumhydroxide with a known concentration, using phenolphthalein as anindicator. For each of the...
- Q What equations are/can be used to describe the velocity profilefor a turbulet flow in a pipe and how do you visualise the plot inexcel?
- Q How long will it take to plate 1.25 grams of Copper metal from asolution of CuSO4, if a current of 2.0 A is used? Assume100% efficiency.
- Q How can the Van Der Waals equation of state be used to determinewhether a substance will be a solid, liquid or gas at a certaintemperature and pressure?
- Q Is the ionic compound CaCO3 soluble or insoluble, and does eachof its ions tend to be soluble?a. Both ions soluble b. Both ions insoluble c. Ions differ;soluble d. Ions differ;...
- Q what reaction type isCu2+ + OH- Â Â --->Cu(OH)2CuSO4 x 5H2O ----> CuSO4CuSO4 ------> CuSO4 x5H2ONH4Cl -----> NH3 + HClReaction Type Options are:1. Combination, Synthesis or Formation Reaction2. Decomposition Reaction3. Single Displacement...
- Q Classify the reaction Ca(OH)2 (aq) + H2CO3(aq) → CaCO3(s) + 2H2O(l):a. Acid-Base b. Precipitation c. Both d. NeitherSodium phosphate reacts with calcium chloride. Write the balanced,net ionic equation, and then...
- Q 21.83 mL of a Pb2 solution, containing excess Pb2 , was added to10.75 mL of a 2,3-dimercapto-1-propanol (BAL) solution of unknownconcentration, forming the 1:1 Pb2 –BAL complex. The excess Pb2...
- Q Part AWhich of the following ionic compounds is expected to have thehighest lattice energy?KINaClNaFMgOBaSPart BWhich of the following atomscould form a fluoride compound (i.e.MFn) in which M has an\"expanded octet\"...
- Q How many grams of AgBr will dissolve in 1.0 L of watercontaining a Br- concentration of 0.050 M? Ksp= 5.0 * 10^-13
- Q What is cyanoarylate ester? What is it used for? What is thehistory behind it?
- Q Post Lab Questions:A perfect percent yield would be 100%. Based on your results,describe your degree of accuracy and suggest possible sources oferror.What impact would adding twice as muchNa2CO3 than required...
- Q For the reaction show below determine the rate law.CH3COCH3 + Br2 → CH3COCH2Br + HBr(aq)The bromination of acetone, an organic solvent, is catalyzed byan acid. The rate of disappearance of...
- Q Write a chemical reaction and a few words to explain why the pHof the formic acid buffer above goes up only tenths of a pH unit(from about 3.6 to about...
- Q Compare the deltaS fusion with the deltaS vaporization forwater. Are they reasonable in terms of the relative disorder of thestates of matter?deltaH fusion= 6.10 kJ/mol and deltaH vap= 40.7 kJ/mol
- Q Propose a buffer system using ascorbic acid. Explain how thissolution can protect against acids and bases, specifically.
- Q Calculate the ΔG°rxn using the following information. 2 H2S(g) +3 O2(g) → 2 SO2(g) + 2 H2O(g) ΔH°f(kJ/mol) -20.6 296.8 -241.8S°(J/mol∙K) 205.8 205. 248.2 188.8 ΔG°rxn = ?+676.2 kJ+108.2 kJ-466.1...
- Q a. Assuming that glucose and water form an ideal solution, whatis the partial pressure of water at 20o C of a solution of 1.00 gof glucose (mol wt 180 g/mol)...
- Q Write balanced net ionic equations for the followingreactions in basic solution:H2O2(aq)+Cr2O2−7(aq)⟶O2(g)+Cr3+(aq)Express your answer as a balanced net ionic equation. Identifyall of the phases in your answer.
- Q What is the pH of 50 ml of a0.10M weak acid (Ka =1.0x10-5) plus 50ml water?What is the pH of 50 ml 0.010M weak base plus 100ml water ? Kb=1.0x10-5.What...
- Q Balance the following oxidation-reduction reactions using thehalf-reaction method.a) S2-(aq) + NO3-(aq) --->S8(s) + NO2(g) acidic solutionb) MnO4-(aq) + I-(aq) --->MnO2(s) + IO3-(aq) basicsolutionc) Sb(s) + H2SO4(aq) --->Sb2(SO4)3(s) + SO2(g)acidic solution
- Q Electronic configurations follow from the principle quantumnumbers n, l, m, and s. What is the relationship with n and theperiodic table? What is the relationship with n and the number...
- Q A 110.0 −mL buffer solution is 0.110 M in NH3 and 0.135 M inNH4Br.Part A What mass of HCl could this buffer neutralize before thepH fell below 9.00? Express your...
- Q 1) Sort the phrases pertaining to pure substances and mixturesas either true or false. Note: If any part of this question isanswered incorrectly, a single red X will appear indicating...
- Q NAD^+(aq)+2H^+(aq)+2e^- --> NADH(aq)+H^+(aq) E= -0.320VOaloacetate^2-(aq)+2H^+(aq)+2e^- --> malate^2-(aq) E=-0.166Va. Calculate the standard potential for the following reaction:Oxaloacetate^2- (aq) +NADH(aq)+H^+(aq) -->malate-(aq)+NAD^+(aq)b. Calculate the equilibrium constant for the reaction at298K
- Q What is the difference between absorption and emission?Transmission and reflection?When plotting a graph of A vs. B, what does it mean if one saysthat A is directly proportional to B?...
- Q If the same volume of the buffer were 0.265 M in NH3 and 0.390 Min NH4Br, what mass of HCl could be handled before the pH fellbelow 9.00?Two sig. figs.m=...
- Q The Na –glucose symport system of intestinal epithelial cellscouples the \\"downhill\\" transport of two Na ions into the cell tothe \\"uphill\\" transport of glucose, pumping glucose into the cellagainst its...
- Q 1.) Determine the energy change (inJoules) associated with the transition from n=2 to n=4 in theHydrogen atom.2.) Calculate the wavelength (in nm)of the red line in the visible spectrum of...
- Q Discuss the difference of the following sample preparation: (a)Liquid-liquid extraction (LLE) (b) Soxhlet extraction (c) Solidphase extraction (SPE) in terms of application, cost, extractiontime, solvent usage.
- Q For a molecule of fluorous acid, the atoms are arranged as HOFO.(Note: In this oxyacid, the placement of fluorine is an exceptionto the rule of putting the more electronegative atom...
- Q What is the [H3O + ] concentration of a solution formed bymixing 50.0 mL of 0.20 M HCl and 50.0 mL of 0.10 M NaOH?Given 100.0 mL of a buffer...
- Q 41. When 0.500 g of cyclohexane, C6H12, is combusted in a bombcalorimeter that has a water sheath containing 750.0 g of water,the temperature of the water increased by 5.5 °C....
- Q Concentrations# of drops# of drops# of dropsStock SolutionStock SolutionReaction (after mixing in well)Reaction (after mixing in well)Reaction Time(seconds)ReactionRate(sec-1)Well #HClH2ONa2S2O3HClNa2S2O3HClNa2S2O3Trial 1Trial 2AverageC1, D112081M0.3MYellow, odorYellow, odor3634350.03C2, D26681M0.3MYellow, odorYellow, odor424142.50.02C3, D34881M0.3MYellow, odorYellow, odor4244430.02Concentrations#...
- Q *** 8 Parts*** Write the equilibrium equation for the followingreactions, and tell whether the reactants or products are favoredin each case.a) 2 CO(g) + O2(g) -------> 2 CO2(g) Keq =...
- Q 53. Which of the following is an acid-base reaction? Select thebest answer.  (A). C(s) + O2(g) ïƒ CO2(g)  (B). 2HClO4(aq) + Ca(OH)2(aq) ïƒ 2H2O(l) +Ca(ClO4)2(aq)  (C). Fe(s) + 2AgNO3(aq) ïƒ 2Ag(s)...
- Q A sample contains a mixture of 239Pu and240Pu in unknown proportions. The activity of the mixedsample was found to be 4.35 x 107 dpm for a sample of0.125 mg of...
- Q Which of the following hydrocarbons is expected to be the mostreactive in ethanloic silver nitrate? Why? Write the organicproduct that you expect when your chosen substrate reacts.[URL=http://s1185.photobucket.com/user/terrazygote/media/Question%201.jpg.html][IMG]http://i1185.photobucket.com/albums/z354/terrazygote/Question%201.jpg[/IMG][/URL]Draw the conjugate acid...
- Q The chief compound in marble is CaCO3. Marble has been widelyused for statues and ornamental work on buildings, including suchstructures as the Taj Mahal. However, marble is readily attacked byacids...
- Q In the simulation, select the Table Salt tab, and set the volumeand the total number of sodium (Na+) ions as mentioned below. Allowthe solution to attain equilibrium. Observe the number...
- Q Use the second law of thermodynamics to explain briefly whathappens, in terms of the entropy of the stable phase, when thetemperature of ice is raised from -10 °C to 10...
- Q Disccuss what happens to copper in photochromic lenses from aredox perspective.
- Q A flask containing pure NO2 was heated to 1250K, atemperature at which the Kpvaluefor the decomposition of NO2 is 177.2 NO2(g) <---------> 2 NO(g) +O2(g)Starting with pure NO2 , the...
- Q Describe one example of a property (and give one equation) ofelectromagnetic radiation that is particle like.
- Q Answer ALL parts. (a) The reaction B + C → D just becomesspontaneous at a temperature of 78.1 °C. When the temperature isincreased to 220 °C: (i) Calculate Gibbs free...
- Q Propose a detailed mechanism for the Knoevenagel condensation,shown below. (6 pts.)
- Q Limiting Reactions Question #11Part a.For the following reaction, 0.289 moles of hydrochloricacid are mixed with 0.562 moles of oxygengas.Hydrochloric acid (aq) + oxygen (g) = water (l) + chlorine(g)What is...
- Q Indicate the concentration of each ion present in the solutionformed by mixing the following. (Assume that the volumes areadditive.)(a) 30 mL of 0.100 M HCl and 10.0 mL of 0.520...
- Q A)An exactly 500 gram iron ore sample was determined to contain242 grams of iron. What is the mass percent of iron in the ore?B) What are the coeffieceints for the...
- Q What is the maximum number of electrons in an atom that can havethe following quantum numbers?(a) n = 4, ms = -1/2____(b) n = 5, l = 3____(c) n =...
- Q 14: An electron in hydrogen atom at the energy level n = 7undergo a transition to level n = 3: Find the frequency and theenergy of the emitted photon.15: An...
- Q 1 Write a balanced equilibrium equation and equilibrium constantexpression for the dissolution of Ca(OH)2(s).2. If a compound is only slightly soluble, will the equilibriumlie “to the left†or “to the...
- Q Adult hemoglobin (iron-containing protein) can carry up to fouroxygen molecules per hemoglobin molecule, with the addition ofoxygen proceeding in a step-wise fashion. For the third step, thevalue of the equilibrium...
- Q Kinetic Study of an Iodine Clock Reaction.Flask A contains 5.00 mL of 6 M HCl (density 1.11 g/mL). Flask Bcontains 5.00 mL of the same 6M HCl solution used in...
- Q 1) How many atoms are there in 51.3 g of barium chloride(BaCl2)?2) How many moles of carbon monoxide (CO) are in 29.3 g of thecompound?3) What is the formula for...
- Q consider a 1.00 M solution of a weak acid, HA. The pH of thesolution is found to be 3.85. A) calculate the [H3O+] in thesolution. This would be the equilibrium...
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