Chemistry question and answers for August 26, 2023
- Q Use the density and molecular weight of limonene, linalool, andnonane to calculate the volumes of the compounds you will need tomake the stock solution of 50 mM. Also calculatethe final...
- Q 1. Suppose 50.00 mL of 2.0 × 10–4 M Fe(NO3)3 is addedto 50.00 mL of 2.0 ×10-6 M KIO3. Which of the followingstatements is true? For Fe(IO3)3, Ksp = 1.0...
- Q Anintravenous electrolyte solution has a Na+ ion concentration of 154mEq/L. If a patient in the hospital receives 1500 mL if thissolution how many equivalents have they received?
- Q 1.Consider the following generic reaction:2A + B + C -> 2D +3EFrom the following initial rate determinations, write the ratelaw for the reaction, determine the overall order for the reactionand...
- Q 1) Classify each of the following as a mixture, a compound, oran element?table sugar, propane, bronze, tea, vinegar, dry ice, oxygen,aluminum2) Select the statements that pertain to elements. Select allthe...
- Q The use of TLC to monitor the reaction of vanillin with enzymesproduced by yeast relies on the fact that the reactant and productare expected to have very different Rf values.Could...
- Q The recommended dose of quinine is 0.800 g/kg. If we assume thedensity is 1 g/ml what is the ph of this solution? the molar massof quinine is 324.412. If 100...
- Q briefly describe the theory of gas chromatography and thefunction of a basic gas chromatogram?
- Q A 10.0-ml solution of 0.780 M NH3 is titrated with a0.260 M HCL solution. calculate the pH after the followingadditions of the hcl solution:A. 0.00B. 10.0C. 30.0D. 40.0
- Q 5. In the titration of 15.00 mL of a 0.1000 M acetic acidsolution by a 0.1000 M NaOH solution, find the pH of the solutionbeing titrated whena) 0.00 mL of...
- Q What mass of dichloromethane (CH2Cl2)should be dissolved 20.9 moles of dihydrogen monoxide(H2O) for the resulting solution to have a freezingpoint of -0.0183 degrees Celcius? The freezing point of puredihydrogen monoxide...
- Q A rocket took 300 days to travel 780,000,000 km. It carried 200.tons of propellant (density 0.986 g/mLa) What is this in miles per hour?b) Express the fule efficiency in miles...
- Q Dinitrogen pentoxide (N2O5) decomposes in chloroform as asolvent to yield NO2 and O2. The decomposition is first order witha rate constant at 45 ∘C of 1.0×10−5s−1.Calculate the partial pressure of...
- Q Chemistry: Calorimetry and Heats of ReactionMass of water in styrofoam cup: 100gMass of KCl: 1.650gInitial Temperature: 20.6degCFinal Temperature: 19.6degCq=(75g)(1.0 cal/g x degC)(-1degC)= -75calqreaction= -qcontents-75 cal = 75 cal --> 0.075kCal1.650g...
- Q Three different blocks of Al, Cu, and Fe, each of them with amass of 8.5 g, 4) absorb 0.845 kJ of heat at 25°C. The specificheats of Al, Cu, and...
- Q The decomposition of N2O5 occurs with a rate constant of 4.3 x10–3 sec–1 at 65C and 3.0 x 10–5 sec–1 at 25C. What is theactivation energy of the process?
- Q 1. Consider the thermodynamics of the hypothetical processH2O(l) --> ice-nine(s)Based on the information above, will DG° for the formation ofice-nine from liquid water be positive or negative? Explain how youknow.Will...
- Q Reduction half-reactionE∘ (V)Ag+(aq)+e−→Ag(s)0.80Cu2+(aq)+2e−→Cu(s)0.34Sn4+(aq)+4e−→Sn(s)0.152H+(aq)+2e−→H2(g)0Ni2+(aq)+2e−→Ni(s)−0.26Fe2+(aq)+2e−→Fe(s)−0.45Zn2+(aq)+2e−→Zn(s)−0.76Al3+(aq)+3e−→Al(s)−1.66Mg2+(aq)+2e−→Mg(s)−2.371)Use the table of standard reduction potentials given above tocalculate the equilibrium constant at standard temperature (25 ∘C)for the following reaction: Fe(s)+Ni2+(aq)→Fe2+(aq)+Ni(s)2)Calculate the standard cell potential (E∘) for...
- Q A TLC plate showed two spots of Rf 0.25 and 0.26. The plate wasdried carefully, and returned to the developing chamber. What wouldyou expect to see after the second development...
- Q Glutamine (HQ) is a diprotic amino acid with Ka1=6.5x10^-3 andKa2=1.00x10^-9. Determine the pH of the following solutions.A) 0.298 M glutamine hydrochloride (H2Q+ Cl-)B) 0.298 M glutamine (HQ)C) 0.298 M sodium...
- Q The standard electrode use to reference all electrode potentialsto is? A.chlorine/chloride B.Cu2+/copper C.proton/hydrogenD.Zn2+/zinc
- Q A student is working on the separation of a three-compoundmixture, consisting of a carboxylic acid, amine, and neutralcompound, and starts by extracting the dichloromethane solution ofthe mixture with 10% NaHCO3...
- Q Calculate the pH for each of the following cases in thetitration of 50.0 mL of 0.190 M HClO(aq) with 0.190 M KOH(aq).a) before addition of any KOHb) after addition of...
- Q A 1H 127I molecule, with a bond length of 160 pm, absorbed onthe surface and rotates in two dimensions. A) Calculate the zeropoint energy associated with this rotation B) What...
- Q Consider the following liquid junction cell at roomtemperature:Zn(s) / ZnSO4(aq) // CuSO4(aq) / Cu(s)The left side of the cell contains an electrolyte solution at9.26*10^-2 M and the right side of...
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