Chemistry question and answers for September 21, 2023
- Q Assuming that ?H
- Q Why don't cationic and anionic polymerizations terminate bycoupling?
- Q A solution was prepared by dissolving 0.0170 mole of propionicacid and 0.0179 mole of sodium propionate in 1.00 L?What would be the pH of the solution in beaker after 2.00...
- Q Data Table I: Freezing Point DepressionTime (in minutes)Ethyl AlcoholTrial #1Temp (in oC)Ethyl alcoholTrial #2Temp (in oC)Isopropyl alcohol Trial #1Temp (in oC)Isopropyl alcohol Trial #2Temp (in oC)Initial24252324Â Â Â Â Â Â Â Â 1:0010511112:000200773:00-2-2544:00-5-4325:00-6-4216:00-6-5107:00-7-6008:00-9-6-109:00-10-6-1-110:00Below -10-7-1-111:00Below -10-7-1-112:00Below -10-7-1-113:00Below...
- Q . 25.5 g of NaCH3COO is added to a solution of 0.550M CH3COOH toa final volume of 500 mL4. a. What is the pH? Ka = 1.8 x 10-5b. What...
- Q The transition of an electron from the principle quantum numbern = 4 to n = 2 in atomic hydrogen causes emission of a photon ofwhat wavelength?
- Q Which of the following is the conjugate acid ofH2S?Select one:a. H3S+b. H+c. H2SO4d. HS-e. SWhich of the following is a weak acid?Select one:a. salicylic acidb. hydrochloric acidc. sulfuric acidd. hydrobromic...
- Q Identify all allowable combinations of quantum numbers for anelectron.n=3,n=3, ?=2,?=2, m?=2,m?=2, ms=−12ms=−12n=5,n=5, ?=4,?=4, m?=−1,m?=−1, ms=−12ms=−12n=3,n=3, ?=−2,?=−2, m?=2,m?=2, ms=+12ms=+12n=6,n=6, ?=6,?=6, m?=1,m?=1, ms=+12ms=+12n=4,n=4, ?=3,?=3, m?=4,m?=4, ms=+12ms=+12n=2,n=2, ?=0,?=0, m?=0,m?=0, ms=−1
- Q Determination of a Molar Mass by Freezing Point Depression: Thisexperiment used Stearic AcidExperiments done in many first-year chemistry courses. Theyoften use cyclohexane as the solvent and compounds such asp-dichlorobenzene, biphenyl,...
- Q Mass of antacid in sample: 1.5004 gAntacid tablet: 1.6080 gComposition of antacid:Aluminum hydroxide: 160 mgMagnesium carbonate: 105 mgMolarity of EDTA: 0.01000 MPipet a 10.00 mL aliquot of the antacid sample...
- Q How many grams O2are needed to react completely with 2.60 mole FeS, in thisreaction?      4 FeS + 7 O2→2 FeO3 + 4 SO21.28 x 10 3g0.258 g329 g44.1 g3.90 x 10...
- Q A buffer is prepared by adding 2.78g of potassium acetate to173mL of 1.25M acetic acid. What is the pH of the buffer? Write thenet ionic equation for this buffered solution....
- Q 1. Explain if the concentration of the base increases,decreases, is not affected or cannot be calculated, for thefollowing situations:a) the concentration of the HCl solution was less than theactual valueb)...
- Q . Three moles of an ideal gas (CV,m =3/2R ) is compressed at25℃, at pressure of 1 atm to 75 atm, with a surrounding maintainedat 25℃. The process was performed...
- Q What is the pH of a 0.15 M solution of potassium nitrite (KNO2)?(The Ka value for nitrous acid (HNO2)is 4.0x10^-4).
- Q “Atomic fission†is when a nucleus gets hit by a neutron andsplits in half, releasing a great deal of energy. It is the basicprinciple behind nuclear reactors and nuclear weapons....
- Q A sample of pure NO2NO2 is heated to 336 ∘C∘C at whichtemperature it partially dissociates according to theequation2NO2(g)⇌2NO(g)+O2(g)2NO2(g)⇌2NO(g)+O2(g)At equilibrium the density of the gas mixture is 0.525 g/Lg/L at0.755 atmCalculate...
- Q The following data were obtained from experiments to find themolecular formula of an unknown compound which acts as a commonlocal anesthetic. The unknown compound contains only carbon,hydrogen, nitrogen, and oxygen....
- Q Consider the following system at equilibrium where Kc= 0.159 and delta H° = -111kJ/mol at 723 K.N2(g) + 3H2(g) = 2NH3(g)The production of NH3(g) is favoredby:Indicate True (T) or False...
- Q The laundry bleach is listed at 5.25% m/m NaClO. Calculate theconcentration of the NaClO in the laundry bleach solution in mol/L.Assume the density of the bleach solution is of 1.05...
- Q Given that Buffer A contains 200 ml of 0.05 M HOCl and 400 ml0.03 M NaOCl, calculate the pH of the buffer solution, the pH ofthe solution after adding 10...
- Q Calculate the pH at the equivalence point for the titration of0.100 M methylamine (CH3NH2) with 0.100 M HCl. The Kb ofmethylamine is 5.0
- Q place the following compounds in order of increasing(weakest to strongest) strength of intermolecular forcesc2h6, ch3oh ch3f
- Q Carbonyl fluoride, COF 2 , is an important intermediate used inthe production of fluorine-containing compounds. For instance, itis used to make the refrigerant carbon tetrafluoride, CF 4 via thereaction 2COF...
- Q In terms of potentialenergy, state why atoms tend to bond in nature.Which member of each ofthe following pair would you expect to have the highest meltingpoint? Explain your reasoning.a. CaO...
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