Chemistry question and answers for August 12, 2023
- Q We ran a recrystallization experiment in lab, ultimtely I knowrecrystallization is used for purification purposes, but thisquestion is confusing me.What affect did recrystallization have upon the yield ofproduct, the appearance...
- Q Give an example of how a flurogenic assay works to detect theproducts of an enzymatic reaction.
- Q 1.687 g of N-2-acetamido-2-aminoethane-sulfonic acid potassiumsalt (ACES–K , MW = 220.29 g/mol) is dissolved in 90.76 mL ofwater. 15.18 mL of HCl is added to the solution, resulting in a...
- Q For the reaction 3O2(g) + 4NO(g)-->2N2O5(g)the rate of change in concentration of O2, delta[O2]/deltat =0.057 mol/L.sec. What is the rate of change of NO and what is therate of change...
- Q 1. In preparation of common alum, why is it necessary to reducethe volume of your reaction mixture after the addition of sulfuricacid?2. What was the whitish material that formed in...
- Q When 2.3 g Co(NO3)2 is dissolved in 0.375 L of 0.44 M KOH, whatare [Co2+], [Co(OH)42- ], and [OH- ]??? (Kf of Co(OH)42- = 5.0109)
- Q What is the advantage of using max wavelength rather than thewavelength nearby such as 580 nm?This is for the Bradford protein assay where the maximum of theabsorbance spectrum is at...
- Q Compare the binding isotherm of normal hemoglobin (at pH 7.4,with 7.8 mM 2,3 BPG) with that of the following variations. Foreach variant, clearly explain why or why not the binding...
- Q When heated, ammonium carbonate decomposes as follows:NH4CO2NH2(s) ⇌ 2NH3(g) + CO2(g). At a certain temperature theequilibrium constant is KP = 2.9 x 10-3.Calculate the total equilibrium pressure at this temperature.
- Q Calculate delta H rxn (at 500K) for the formation of 1mol of ammonia gas. (show worked out solution)
- Q Discuss the effect of (a) cholesterol addition, (b) free fattyacid addition, and (c) lysophospholipid addition to a membranebilayer. Be sure to include an explanation of concentrationdependence in biochemical and physical...
- Q What is the effect of the following changes on the volume of 1mol of an ideal gas? (Note: You should NOT need to do any explicitnumerical calculations. Use your qualitative...
- Q If the pH of a 1.00-in. rainfall over 1800miles2 is 3.40, howmany kilograms of sulfuric acid, H2SO4, are present, assuming thatit is the only acid contributing to the pH?For sulfuric...
- Q 10.Why aren’t there more Level 3 laboratories in the U.S? (You mayneed to use the Internet to research this question.)
- Q Nevermind
- Q 1. Write out the balanced equation for the oxidation ofhydrobromic acid by hydrogen peroxide.2. How many stereoisomers of stilbene dibromide can exist?3. A possible definition of a meso compound is:...
- Q 5.0 g of iron is reacted with 5.0g of water according to thechemical equation shown below. 3 Fe(s) + 4 H2O(l) → Fe3O4(s) + 4H2(g)a) Calculate the amount of Fe3O4...
- Q Aspartate transcarbamoylase (ATCase) catalyzes the first step inthe biosynthesis of a nucleotide. The end product of the pathway,cytidine 5’-triphosphate (CTP), in turn inhibits ATCase activity.This effect can be overcome by...
- Q To what volume (in mL) should you dilute 100.0 mL of a 5.00 MCaC2 solution to obtain a 0.750 M CaC2 solution?
- Q A 20 gram iron block at an initial temperatureof20oCis placed in 20 grams of water at an initial temperatureof80oC.Assuming no heat is lost to the surroundings, what would be thefinal...
- Q Use the Henderson–Hasselbalch equation to calculate the pH ofeach solution:a solution that is 17.0 g of HF and 26.5 g of NaF in 125 mL ofsolutionPLEASE SHOW ME YOUR WORK
- Q What is the prefix for a -SH group?hydroxy-carboxy-oxo-acetyl-mercapto-
- Q A 1.0 oz (30.0 mL, 1.00 g/mL) espresso contains 55.0 mg ofcaffeine (C8H10N4O2). Calculate the caffeine concentration in thefollowing units. You may assume your espresso contains onlycaffeine and water for...
- Q how many carbon dioxide molecules are produced for every gram ofethanol combusted?
- Q The oxidation of copper(I) oxide, Cu2O(s), to copper(II) oxide,CuO(s), is an exothermic process.2Cu2O + O2 = 4CuOThe change in enthalpy upon reaction of 85.49 g of Cu2O(s) is-87.23 kJ. Calculate...
- Q The specific internal energy of helium at 300 K and 1 atm is3800 J/mol, and the specific molar volume at the same temperatureand pressure is 24.63 L/mol. Calculate the specific...
- Q 1.If 147 mg of cyclohexanol and 2.2 mL of Clorox are mixed in excessacetic acid and 130 mg of cyclohexanone are produced, the percentyield is ___ %2. If 152 mg...
- Q 1. How can the Kc of two possible reactions becompared to determine which reaction is occuring?2. How are the equilibrium moles of reactants(ions remaining insolution) calculated?3. What are the equilibrium...
- Q Sodium burns in chlorine to form sodium chloride, NaCl. How manygrams of sodium Chloride will be formed when 1.8 grams of sodium isburned in 2.00 grams of Chlorine? what is...
- Q calculate the equilibrium concentration of H2CO3 and HCO3 in1.0M Na2CO3 at 25 Celsius
- Q 6. You mix 50.0 mL of a weak monoprotic acid with 50.0 mL ofNaOH solution in a coffee cup calorimeter. Both solutions (and thecalorimeter) were initially at 22.0OC. The final...
- Q Considering the reaction 2Al2O3+3C----> 4Al +3CO2A- How many moles of C are needed to react with 7.75 moles ofAl2O3?B- How many grams of Al result when 355 grams ofAl2O3 react?
- Q Ions B and C to form the complex BC. If 35.0 mL of 1.00 M B iscombined with 35.0 mL of 1.00 M C, 0.00500 mol of BC is formed.Determine...
- Q ​Given the following reaction and thermodynamic data, what is areccomended temperature for a 1 L pilot scale reactor and how long(time) does it take for the reaction to take place?CH3OCH2CH2CH2OCH2NH2...
- Q QUESTION 1We will be using spectrophotometry to determine theconcentration of iron in solutions. First, you will generate acalibration curve. The ----- variable is -----, and will be graphedon the x...
- Q Given 855cm^3 of a 0.00330M silver nitrate is mixed with 424cm^3of a .0110M potassium chromate find,a) balanced equation for both substances when placed inwaterb) equation for the net ionic reactionc)...
- Q Part1. Calculate the nuclearbinding energy (in J) and the nuclear binding energy per nucleonof241Pu94(241.0568453 amu).Part 2.A freshly isolated sample of90Y was found to have an activity of8.2 × 105disintegrations per...
- Q How does a Fourier Transform Infrared Spectrometer (FTIR)work? Summarize the method and give figures and curves to explainthe description.Give at least 3 references.
- Q Briefly state the principle of a Faraday Cup detector for a massspectrometer.
- Q 1.   Write A for anti-addition or S for syn-addition to alkenes on the line provided foreach of the following:_______ Hydroxylation with cold Permanganate oxidation---------------Catalytic hydrogenation-------------Bromination-----------------Chlorination_______ Halohydrin formation      ___ Hydroxylation withOsmium...
- Q For each of the following sets of chemicals, predict theirrelative reactivity in the given type of reaction mechanism. Listthem in order (from least reactive to most reactive) and explainwhy (the...
- Q What is the vapor pressure of a solution of 300 g of ethyleneglycol, HOCH2CH2OH (mol wt = 62.1) and 200 gof water (a 60% solution by weight) at 100 ºC....
- Q The following reversible gas-phase reaction is carried out in a10 L batch reactor.A <->C -rA = CA – 0.5CC [mol/(L h)]Determine the pressure, temperature, and gas phase composition(mole fractions) in...
- Q What are some pros and cons of a pH probe for titration? Aindicator for titration?
- Q Hi!I kep trying this question and can't get it right.At a certain temperature, the equilibrium constant for thefollowing chemical equation is 2.90. At this temperature, calculatethe number of moles of...
- Q Question: A beaker with 1.40×102 mL of an acetic acidbuffer with a pH of 5.000 is sitting on a benchtop. The totalmolarity of acid and conjugate base in this buffer...
- Q A 25.0-mL solution of 0.100 M acetic acid is titrated with a0.200 M KOH solution. Calculate the pH after the followingadditions of the KOH solution:a) 0.0 mL b) 5.0 mL...
- Q Rotational spectroscopy observe what type of molecule? What ishis energy range? Measured molecule properties.vibrational spectroscopy observe what type of molecule? What ishis energy range? Measured molecule properties.
- Q 1)A typical commercial antacid tablet contains 0.350 g of CaCO3[MW=100.09 g/mol] as an active ingredient. How many moles of HClcould this tablet neutralize? 2)A student was analyzing an antacidtablet with...
- Q 1) The emission spectrum of a hollow cathode lamp for molybdenumwas found to have a sharp peak at 313.3 nm as long as the lampcurrent was less than 50 mA....
- Q Calculate the pH for each of the following cases in thetitration of 50.0 mL of 0.140 M HClO(aq) with 0.140 M KOH(aq).(a) before addition of any KOH(b) after addition of...
- Q 4. Given the following half reactionFe(OH)3 (s) + e- +3H+ çèFe2+ + 3H2O log K = 15.8(6 pts) The Grinnell formation in Glacier N.P., formed fromocean sediments, is typified by...
- Q Suppose that the microwave radiation has a wavelength of 12.4 cm. How many photons are required to heat 285 mL of coffee from 25.0∘C to 62.0 ∘C? Assume that the...
- Q Indicate the concentration of each ion present in the solutionformed by mixing44.0 mL of 0.100 M Na2SO4 and 25.0 mL of 0.200M KCl3.80 g KCl in 75.0 mL of 0.230...
- Q A battery is constructed based on the oxidation of magnesium andthe reduction of Cu2+. The initial concentrations of Mg2+ and Cu2+are 1.1×10−4 M and 1.6 M , respectively, in 1.0-literhalf-cells....
- Q Suppose that a catalyst lowers the activation barrier of areaction from 122 kJ/mol to 59 kJ/mol .Part ABy what factor would you expect the reaction rate to increase at25 ∘C?...
- Q In what form (Fe3+ or FeSCN-) could iron be determined byvisible spectroscopy?
- Q complete and balance the net ionic equations for reactions thatwould occur:Zn(s)+Mg2+(aq)--->Zn(s)+Cu2+(aq)---->Zn(s)+H+(aq)----->Mg(s)+Zn2+(aq)----->Mg(s)+Cu2+(aq)--->Mg(s)+H+(aq)---->Cu(s)+Zn2+(aq)---->Cu(s)+Mg2+(aq)---->Cu(s)+H+(aq)----->
- Q A small gas turbine uses C8H18(l) for fuel and itenters the combustionchamber at 25â—¦C whereas air coming from the high pressure stage isat 287â—¦C . The products of combustion leave...
- Q Use bond enthalpies to estimatea) the enthalpy of the anaerobic breakdown of glucose to lacticacid in cells that are starved of oxygen, C6H12O6(aq) → 2CH3CH(OH)COOH(aq),b) the enthalpy of combustion of...
- Q Why might percent recovery be low during extractions?A mixture that contains benzoic acid, 4-chloroaniline andnaphthalene. The 4-chloroaniline is separated first by extractionwith hydrochloric acid.Since no phenolic compound is present inthis...
- Q use daltons law to calculate pressures in mixtures of gases.any examples on this review? please provide a problem with stepsleading to a solution to help me review, thanks!
- Q As temperature increases does a compounds vapor pressure change?Does its boiling point change? Explain
- Q Introduction on how climate change and its effects on theefficiency of food production.
- Q Describe how the retention time of a peak is calculated ifdichloromethane is injected with the sample
- Q Find the pH during the titration of 20.00 mL of 0.1500 M benzoicacid, C6H5COOH (Ka = 6.3 10-5), with 0.1500 M NaOH solution afterthe following additions of titrant. (a) 0...
- Q Calculate the pH of a titration of 50.00 mL of 0.100 MPhenylacetic acid , Ka = 4.9 x 10-5, with 0.100 M NaOH at thefollowing points:SHOW ALL WORK IN NEAT...
- Q There are two possible methods for recovering copper from asolution of copper (II) sulfate, one uses precipitation and theother uses redox.(a) Copper(II) ions can be precipitated as copper(II)carbonate.CuSO4(aq) +Na2CO3(aq) →CuCO3(s)...
- Q Ethanol (C2H5OH) is a very important chemical.inaddition to being widely used as an industrial solvent,a gasolineadditive,and an alternative fuel,it is well known as the alcoholicbeverages.A common name for ethanol is...
- Q Part AAspirin (acetylsalicylic acid, C9H8O4) is a weak monoproticacid. To determine its acid-dissociation constant, a studentdissolved 2.00 g of aspirin in 0.600 L of water and measured thepH. What was...
- Q 2.0L of a 1.6 M solution is diluted to a total volume of 16.0 L. Whatis the new molarity
- Q Consider the following molecules or ions: ClO2+ , AsF6 - ,IOF3,  and SOF2. Answer the following questions based onthe Lewis structures and VSEPR theory prediction of their molecularshapes.(a) Which one has...
- Q a 50 mL sample consisting of 0.15 M nicotine C10H14N2 is totrated with 0.25 M HBr. The Ka of nicotine is 1.0*10^-6 calculatethe pH after adding 5.0 mL of HBr...
- Q Complete and Balance each reaction in molecular, ionic, and netionic form:1. AgNO3(aq) + K2CrO4(aq) ---->Ionic:Net Ionic:2. Ba(NO3)2(aq) + (NH4)3PO4(aq) ---->Ionic:Net Ionic:3. NaHCO3(aq) + H3PO4(aq) ----->Ionic:Net Ionic:
- Q Analyze the reactions below and determine which of them has thelargest relative increase in entropy? Circle your choice andexplain your answer qualitatively.CO (g) + 3 H2 (g) <---> CH4 (g)...
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