Chemistry question and answers for August 12, 2023
- Q After 1.60 mol of NH3 gas is placed in a 1600-cm^3 box at 25degrees C, the box is heated to 500 K. At this temperature, theammonia is partially decomposed to...
- Q A water sample contains 150 mg/L ethylene glycol (C2H6O2) and200 mg/L phenol (C6H6O). Calculate the COD and TOC.
- Q Gaseous methane will react with gaseous oxygen to producegaseous carbon dioxide and gaseous water. Suppose 15.7 g of methaneis mixed with 34. g of oxygen. Calculate the maximum mass of...
- Q Write a balanced chemical equation to describe the combustionreaction of methane (CH4). Use standard enthalpies offormation to calculate the ΔHrxn for the equation youwrote. If you burn enough methane to...
- Q Compare and contrast scanning tunneling microscopy (STM) andatomic force microscopy (AFM)? List at least two advantages and twodisadvantages for both methods. Please reference at least onesource in your discussion.
- Q Using the paper, “Multiparametric Atomic Force MicroscopyImaging of Biomolecular and Cellular Systemsâ€, describe what ismeant by “Multiparametric AFMâ€.  Describe the impact andadvantages of this approach. (Acc. Chem. Res. 2017, 50,924−931)
- Q To calculate the isoelectric point of amino acids having otherionizable functional groups, we must also take into account thepKaof the additional functional group in the side chain.For an acidic amino...
- Q 1. Discuss the applicatoin of distillation as a separation andpurificatoin technique. Are there limits due to sample size,initial purity and final purity desired?2. Discuss the applicatoin of gas chromatogrpahy as...
- Q A buffer solution is made by dissolving .17g of ammonia and1.07g ammonium chloride in enough water to make 250mL ofsolutionDetemine molarity of ammonium chlorideDetemine ammonium concentrationDetermin solution molarity relative to...
- Q What additives may be used to prevent acid catalyzed hydrolysisof drugs containing ester moieties in drug formulations?
- Q 1. (a) What is the Na+ concentration in each of thefollowing solutions:2.85 M sodium sulfate:2.18 M sodium carbonate:0.985 M sodium bicarbonate:(b) What is the concentration of a lithium carbonate solutionthat...
- Q At 200 K, the compression factor of oxygen varies with pressureas shown in the table below. Evaluate the fugacity of oxygen atthis temperature and 124 atm.p/atm1.00004.00007.000010.00040.0070.00100.0Z0.99710.99710.978800.969560.87340.77640.6871
- Q a)During an experiment, a student mixed 14.5mL of a 0.500 Msodium fluoride solution with 15.6 mL of a 0.750 M hydrofluoricacid solution the measured pH was 3.24.Calculate thepKa.b)Calculate th pH...
- Q Balance following simple redox reaction Ca(s) + blank Fe+3(aq)blank + ca+2(aq) + Fe
- Q Consider the following balanced equation:2N2H4(g)+N2O4(g)→3N2(g)+4H2O(g) Complete the following tableshowing the appropriate number of moles of reactants and products.If the number of moles of a reactant is provided, fill in therequired...
- Q A cough medicine contains 0.40% (w/v) dextromethorphan, a coughsuppressant, and1.2% (w/v)guaifenisin, an expectorant.How manymilligrams of each drug would you obtain from3.5 tspof cough syrup?(1 tsp = 4.93 mL)
- Q Aluminum chloride is made from aluminum metal and chlorine gas,as shown:2Al(s) + 3Cl2(g) ---> 2AlCl3(s)When 10.0g of aluminum and 25.0g of chlorine are reacted, 18.6gof aluminum chloride is formed. Determine:a)...
- Q 12. Write the appropriate nuclear symbol for each of thefollowing isotopes: (a) Z = 11, A = 23 (b) Z = 28, A = 64 (c) Z =50, A =...
- Q 20 mL of 15% HCl(v/v)1000 mL of 10% HCl(w/v)Give the percentages of the following: 130 mg of HCl + 90 g ofH20How many grams of sodium chloride are there in...
- Q 1) When the Ag+ concentration is1.08 M, the observed cell potential at 298K for anelectrochemical cell with the following reaction is1.654V. What is theZn2+ concentration?2Ag+(aq)+ Zn(s) >2Ag(s) +Zn2+(aq)Answer: ___ M2)...
- Q Calculate the vapour pressure lowering of a 1M aqueous sucrose(sugar) solution at 25 oC where po(H2O) = 23 mm Hg. The density of1M sucrose at 25 oC is 1.129 g/mL.The...
- Q What is the calculated value of the cell potential at 298K foran electrochemical cell with the following reaction, when the Ag+concentration is 1.49 M and the Al3+ concentration is 3.15×10-4...
- Q How is glycogen breakdown and synthesis regulated in the liverby glucagon and insulin? (Are the processes increased or decreasedby these hormones?)
- Q Please outline only the main steps of an efficient columnchromatographic separation of a non-polar compound A from a mediumpolar compound B and a non-polar chemical (C). C is slightly lesspolar...
- Q cA) [Mn(H2O)6]3+(sp3d2 octahedral)B) [Mn(NO2)6]3-(d2sp3 octahedral)C) [Ni(CN)4]2- (square planar)
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