Chemistry question and answers for August 09, 2023
- Q Concentration of HCl can be measured by its reaction with Na2CO3:2H+ + Na2CO3 –> 2Na+ + H2O + CO2 A volume of 23.75 ± 0.04 mL HCLsolution was required to...
- Q Determinar la molaridad de una solución que contiene 60 g. deNaOH en 500 ml. de solución
- Q For the exothermic reactionPCl3(g)+Cl2(g)⇌PCl5(g)Kp = 0.160 at a certain temperature.A flask is charged with 0.500 atm PCl3 , 0.500 atmCl2, and 0.300 atm PCl5 at this temperature.What are the equilibrium...
- Q Can you tell me why in some experiments (such as biodieselproduction) do we need to test the cloud point and pour point? Whatis the purpose?
- Q HCl + NH3 ---> NH4ClCalculate the molar enthalpy of the reaction in terms of kJ permol of NH4Cl
- Q The data below was obtained for titration of 25.00mL of a weakacid with 0.150 M KOH. What volume of the KOH solution is requiredto reach the stoichiometric point? Answer: __...
- Q Burning sulfur-containing coal results in the redox reactionsbelow:HgS + O2 ----> Hg + SO2Hg + O2 ----> HgOExplain why burning coal may involve redox reaction?
- Q Ammonia is produced industrially from the reaction of hydrogenwith nitrogen under pressure in a sealed reactor. What is thepercent decrease in pressure of a sealed reaction vessel during thereaction between...
- Q what distills first in the 3 types of chromatography? Like dopolar or non polar molecules go through first in Simple,fractional, and gas chromatography and what type of solvents (polaror nonpolar)...
- Q whydo we raise the pH before the second centrigugering in proteinseperation
- Q A biochemical engineer isolates a bacterial gene fragment anddissolves a 17.0 mg sample of the material in enough water to make38.9 mL of solution. The osmotic pressure of the solution...
- Q Which of these polymers is NOT formed by a condensationreaction? Explain why.A. polyesterB. polyethyleneC. nylonD. polyamideE. All of the above are formed by acondensation reaction.
- Q What are differences in effects for a chemical and physicalinterference in an atomic emission spectrometry? (Explain??)
- Q 1.Which amino acid traveled the furthest up the TLC plate and whichamino acid traveled the least?2. Why must use a pencil instead of pen to write on TLC plate?3. What...
- Q Answer the reason why the cellulose is resistance to chemicalattack. ( i.e. chemical structure bonding and so on )
- Q 13. A 15.0 mL NaOH solution is required to neutralize10.0 mL of 0.100 M H2SO4(aq)solution.        What is the concentrationof NaOH solution used?  2NaOH (aq) + H2SO4(aq) → Na2SO4(aq) +2H2O(l)
- Q the Log P value is 4.51 explain briefly how this valueis determined and give an example of its significance related tothe environmental behavior of the chemical?
- Q Howcan we know if a givien acid is strong or weakis it related for a substance being soulable orinsoulableis nonmatels usually tend to form strong acids ?is transition metals tend...
- Q A) Predict the number of different chemically shifted 1H peaksand the fine structure of each peak that you would observe fornitroethane, CH3-H2C-NO2 assuming that 2JNH>3JNH>3JHH andthat only 1H, 12C, 14N...
- Q Calculate the pH of a 0.340M NaO2CCO2Hsolution. pKa1 = 1.250 and pKa2 = 4.266.Apparently the answer is 2.79 but can someone explain this?a. -0.029b. 3.38c. 2.79d. 4.89e. 2.37
- Q a) Calculate the volume of 0.5M NaOH that will be required totitrate a 0.15g sample of aspirin. b) If the student reached theend point of the titration 0.76 mL prior...
- Q Question 2-17You want to maintain a pH = 7.0 for an enzyme-catalyzed reactionthat will produce hydrogen ions along with the desired product. Atequal concentrations, which weak acid, if any, will...
- Q A Zn-Cu battery isconstructed as follows at 25oCZn(s) |Zn+2(aq) (0.20 M) ||Cu+2(aq) (2.5 M) |Cu(s)The mass of each electrode is 200.0gram and the volume of the electrolytes is 1.0 La)...
- Q 3. What drug groups are in LCMSMS method? Why is it important toanalyze these drug groups in urines form patients of a painmanagement clinic?
- Q A) Arrange the following in order of increasing energy:a) 9.9 x 1014 Hzb) 255 nmc) 410 kJ/molB) A metal has a work function of 385 kJ/mol. Which of the abovephotons...
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