Chemistry question and answers for August 24, 2023
- Q Determine the number of possible electron arrangements given thefollowing term:4Dplease show how you determined the answer
- Q Oxy-myoglobin was measured at wavelength of 417 nm with molarabsorptivity of 12,800 M^-1cm^-1. Met-myoglobin was measured atwavelength of 409 nm with molar absorptivity of 17,900 M^-1cm^-1.In 10.0 g of meat...
- Q do the equilibruim concentration of the reactants and theproducts depend on their initial concentration?
- Q A 62.0 mL sample of a 0.122 M potassium sulfate solution ismixed with 36.5 mL of a 0.108 M lead(II) acetate solution and thefollowing precipitation reaction occurs:K2SO4(aq)+Pb(C2H3O2)2(aq)→2KC2H3O2(aq)+PbSO4(s) The solid PbSO4...
- Q Calculate the concentrations of all species in a 1.38 M Na2SO3(sodium sulfite) solution. The ionization constants for sulfurousacid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8.These are the...
- Q A compound containing 3 mCi of Sulfur-35 (half-life = 87 days)isstored in a laboratory. How much radioactivity will there be after348 days?1.0.1875 mCi2.0.75 mCi3.0.375 mCi4.0.1875 mCi5.0.094 mCi
- Q Suppose you add a solution of calcium hydroxide to a solution ofsodium carbonate and a precipitate forms. You measure the totalamount of the precipitate (in g) as a function of...
- Q Consider the reaction of iron (III) sulfate (aq) and sodiumphosphate (aq) to form iron (III) phosphate (s) and sodium sulfate(aq).c. If 2.16 g of iron (III) phosphate are obtained when...
- Q Titanium (Ti) is a strong, lightweight metal that is used in theconstruction of rockets, jet engines, and bicycles. it can beprepard by reacting TiCl4 with Mg metal at very high...
- Q Calculate the pH change that results when 11 mL of 5.8M NaOH is added to 776 mL of each the following solutions.(See the appendix.)pKa = 9.25Ka = 5.6e-10(c) 0.10 M...
- Q 1. What happens to the working electrode when the electrolyteconcentration is changed?2. Explain absorption emission through the JablonskiDiagram.
- Q Zinc, Zn, adn iodine, I2, react to form zinc(II) iodide, ZnI2 (the reactants and the product are all solids at roomtemperature).a. write a balanced chemical reaction for this process.b. suppose...
- Q How were the nanoparticles multiplexed?
- Q A protein assay requires the reaction of the protein solutionwith a protein-binding dye for one minute, followed by measuringthe absorbance of the protein-dye complex at 505 nm. The absorbancedata for...
- Q 1) When 10ug of an enzyme (MW 50,000) is added to a reactionmixture containing its substrate at a concentration one hundredtimes the Km, it catalyzes the conversion of 75umol of...
- Q At 1 atm, how much energy is required to heat 91.0 g of H2O (s)at-16.0 degrees C to H2O (g) at 141 degrees celsius?
- Q 1) Answer the following the questions regarding an acetic acidbuffer solution.a) A solution was prepared by dissolving 0.024 moles of aceticacid (HOAc; pKa =4.8 ) in water to give 1...
- Q 1) If a block of wood has the dimensions of 50.0cm x 50.0cm x45.0cm.What is it's volume in Liters? (Give answer in correctsignificant digits)2) If one kilogram is equal to...
- Q Whyautomatic titration is most accurate than manual titration
- Q Part A What mass of calcium can be produced by this process if acurrent of 6300 A is applied for 39 h ? Assume that theelectrolytic cell is 65 %...
- Q Complete and balance each equation. If no reaction occurs, writeNOREACTION.a) NaNO3(aq)+KCl(aq)?b)NaCl(aq)+Hg2(C2H3O2)2(aq)?c)(NH4)2S(aq)+SrCl2(aq)?d)Al2(SO4)3(aq)+AgNO3(aq)?Thanks
- Q Calculate ΔH∘ in kilojoules for the reaction ofacetylene (C2H2) (ΔH∘f=227.4kJ/mol) with O2 to yieldcarbon dioxide (CO2)(ΔH∘f=−393.5 kJ/mol) andH2O(g) (ΔH∘f=−241.8kJ/mol), a reaction which issupplied by the industrial gases industry for oxyacetylene...
- Q Ammonia reacts with diatomic oxygen to form nitric oxide andwater vapor: 40.0 g NH3 and 50.0 g O2 areallowed to react according to the following equation:4NH3 + 5O2 Ã 4NO...
- Q Johnny had a 50.0 mL sample of 0.4360 MNH4NO3 that he diluted with water to a totalvolume of 250.0 mL. He has to figure out what is the ammoniumnitrate concentration...
- Q Explain chromatography. What is it and how do I use it?
- Q A standard galvanic cell is constructed in which aCd2+ | Cd half cellacts as the cathode. Which of the followingstatements are correct?Hint: Refer to a table of standard reduction potentials.(Choose...
- Q A 130.0 −mL buffer solution is 0.105 M in NH3 and 0.135 M inNH4Br.A) What mass of HCl could this buffer neutralize before thepH fell below 9.00? ​answer to this...
- Q In which of the following pairings of compounds are both membersof the pair strongelectrolytes?NaCN and LiINH3and HINaOH and H2CO3KBr and HBrmore than one answer is correct
- Q Given an absorbance of .493, what is the percent of alcohol in asample of wine?
- Q What mass of sucrose (C12H22O11) should be combined with 485 gof water to make a solution with an osmotic pressure of 8.00 atm at280 K ? (Assume the density of...
- Q A(aq) + B(aq) → 2C(aq)If Kc = 3.4 x 10-17, this indicates that.....At equilibrium there will be nearly equal amounts of reactantand product.At equilibrium there will be no product formed.At...
- Q For each reaction listed, determine its standard cell potential(in V) at 25°C and whether the reaction is spontaneous at standardconditions.(a) 2 Au(s) + 3 Zn2+(aq) → 2 Au3+(aq) + 3...
- Q Calculate the pH at the equivalence point in titrating 0.110 Msolutions of each of the following with 8.0×10−2 MNaOH. chlorousacid (HClO2) benzoic acid (C6H5COOH)
- Q Theatmosphere is a giant sedimentation equilibrium experiment.Nitrogen and oxygen are pulled down by the gravitational potential,and diffuse back upwards due to entropy. Assuming the earth’sgravitational acceleration is uniform and 9.802...
- Q Calculate the percent ionization of formic acid in a solutionthat is 0.010 M HCOOH and 0.005 M HCOONa.Ka (HCOOH) = 1.7x10-4 ? 3.4% is correctanswer
- Q Ammonium bisulfide, NH4HS, forms ammonia, NH3, and hydrogensulfide, H2S, through the reactionNH4HS(s)?NH3(g)+H2S(g)This reaction has a Kp value of 0.120 at 25 ?C.An empty 5.00-L flask is charged with 0.400g of...
- Q draw full sn1 mechanism for a reaction that includes2-methyl-2-propanol, n-pentanol and hydrochloric acid as thereactants and 2-chloro-2-methylbutane and 1-chloropentane asproducts.
- Q A student reacts 96g of salicylic acid with 10 mL of aceticanhydride producing 10.7g of acetyl salicylic acid. What is thepercent yield of the reaction?
- Q Give one advantage and one disadvantage of using a plasmaexcitation source (as oppaosed to a flame) for emissionspectroscopy.
- Q A system initially contains 2 lb of liquid water at 110ºF and0.4 lb of ice at 32 ºF. The system attains an equilibrium state,while pressure remains constant at 1 atm....
- Q 1.    Explain how steps in a procedureremove impurities
- Q Which of the following substances has the lowest boiling point?C12H16 CH2Br2 Br2 IClHow much energy in kJ will it take to melt 5.0 g of frozen Ar at-190o C?T/F if...
- Q ,,
- Q Consider a 0.5 M  solution of  trimethylammonium chloride. The ion  trimethylammonium is the conjugate acid of the the weakbase trimethylamine.ThepKb  of trimethylamine is4.2A) Calculate [H+]B) calculate the concentration of trimethylammonium ionsC) calculate the concentration...
- Q If a solution containing 45 g of mercury(II) nitrate is allowedto react completely with a solution containing 14.334 g of sodiumsulfate. a)How many grams of solid precipitate will be formed?b)How...
- Q Consider the following reactionbetween oxides of nitrogen: NO2(g)+N2O(g)?3NO(g)1.Calculate ?G? at 800 K, assuming that ?H? and?S? do not change with temperature.Express your answer using two significant figures.2.Calculate ?G? at 1000...
- Q Molecular Orbital Theory1.1 Which model, the Lewis electron dotstructure or the MO energy level diagram, better describes thebonding in O2? Remember that liquid O2 isattracted into the magnetic field of...
- Q 4. Calculate the pH of the following salt solutions (5 ptseach). a. 0.237 M sodium cyanide, NaCN (aq) (HCN ka = 4.0 x 10-10)b. 0.166 M ammonium iodide, NH4I (aq)...
- Q A flask with a sample of gas at room temperature and pressureweighs 97.4842 g. The same flask with air (density = 1.17 g/L)weighs 96.8848 g. The same flask filled with...
- Q A flask contains a gaseous mixture of 3.01mol of hydrogen and5.84mol of oxygen gases. When these gases react, steam isproduced.a) Balance the equation for this reaction. H2(g) + O2(g)H2O(g)b) What...
- Q find the ratio effusion rates of hydrogen gas and krytpongas.
- Q Explain these facts: (a) Copper and iron have several oxidationstates, whereas zinc exists in only one.(b) Copper and iron form colored ions, whereas zinc doesnot.(c)Hydrated Mn2+ ions are practically colorless...
- Q You used 50.0mL of hydrochloric acid with 0.500g of magnesium.If the temperature changed from 20.0oC to 24.0oC, what was the heatof reaction (ΔH) for your experiment? Report your answer in...
- Q what is the difference between absorption andemission? transmission and reflection?when plotting a graph of A vs B, what does it mean ifone says that A is directly proportional to B?...
- Q Using only the elements Ca, Cl, Si, give formulas for thefollowing: (a) an ionic compound. (b) a molecular compound withpolar covalent bonds that obeys the octect rule and has no...
- Q What is the bonding functional group and elution order of thefollowing: propyl acetate, butyl acetate, methanol, ethanol,2-butanone, and 4-methyl-2-pentatnone
- Q QUESTION 1Of the quantum numbers n, l, ml,and ms, which is the spin quantum number?mlnlms1 points   QUESTION 2Valence electrons are the outer electrons of an atom.TrueFalse1 points   QUESTION 3What type...
- Q Diazomethane is a highly poisonous, explosive compound becauseit readily evolves N2. Diazomethane has the followingcomposition by mass: 28.57% C; 4.80% H; and 66.64% N. The molarmass of diazomethane is 42.04...
- Q A 3.452 M solution of triethylamine ((C2H5)3N, Kb= 4e-4) has apH of 12.57. What is the percent ionization of this solution?
- Q At 25°C, the standard enthalpy of combustion of gaseous propane(C3H8) is –2219.0 kJ per mole of propane, and the standard enthalpyof combustion of gaseous propylene (C3H6) is –2058.3 kJ per...
- Q Calculate the mass in grams of hydrogen chloride produced when5.95 L of molecular hydrogen measured at STP reacts with an excessof molecular chlorine gas.H2(g) + Cl2(g) → 2HCl(g)
- Q Aldaric acid synthesis expiramentOther oxidation products are possible for galactose but do notaffect the isolation of galactaric acid. Why?
- Q Consider the titration of 70.0 mL of 0.0300 M (CH3)3N (a weakbase; Kb = 6.40e-05) with 0.100 M HBr. Calculate the pH after thefollowing volumes of titrant have been added:(a)...
- Q If there is appeoximately 84,000 people living in Nampa,Idaho and there is an average of 4 people per household and thateach household owns 2 cars, how much total carbon dioxide...
- Q Data Table 1. Adding 0.1M HCl from D1 intoA1.Drop NumberpH of Solution15.025.035.045.055.065.075.085.095.0105.0115.0125.0135.0145.0155.0Data Table 2. Adding 0.1M NaOH from D6 intoA6.Drop NumberpH of Solution16.026.036.046.056.066.076.086.096.0106.0116.0126.0136.0146.0156.0Data Table 3. Adding 6M HCl from Pipet...
- Q Mg(s)+2HCl(aq)=MgCl2(aq)+H2(g)(A) 0.0675g Mg AND 4mL of 6M HCl were used. Barometric pressurewere 28.85 inches Hg. A volume of 73.6mL of hydrogen was collectedat a temperature of 26.0C. The vapor pressure...
- Q Write the balanced molecular and net ionic equations for thereaction between solid copper and nitric acid (6M) concentration.Identify the oxidation and reduction half-reactions. How would thischange if the concetration was15.8M?Balanced...
- Q Draw the reaction diagram from starting material to product of yourspecific reagent.This is for aldol condensation using NaOH and ethanol alongwith benzaldehyde and a simple ketone, 3-Pentanone
- Q Menthanol, CH3OH, formally know as wood alcohol is manufacutredcommercially by the following reaction: CO (g) + 2H2 (g) -->CH3OH (g) a 1.5000 -L vessel was filled with 0.1500 mol CO...
- Q A gas mixture containing water vapor has a dry basis molarcomposition of 8.5% CO, 10.5% CO2,0.5% O2 and 80.5% N2. The gas sat 620c and 1 atm with a dewpoint...
- Q Explain how a molecule can have polar bonds but have nomolecular polarity. Name the compounds that have bond polarity butno molecular polarity ( out of CH4, CF4, NH3, NF3, H2O,...
- Q If anyone can show me how these are solved I wouldappreciate it, answers included though please.16.) Which of the follow conatin the GREATEST numberof MOLES of OXYGEN. Show your work.0.50...
- Q In our chem lab, we were testing for an unknown equilibrium \"k\"value using the absorbency rates of various concentrations, how ami supposed to find the k value if none of...
- Q 1. For each of the following circumstances, indicate wheter thecalculated molarity of NaoH would be lower, higher, or unaffected.Explain your answer in each case.a. The inside of the pipet used...
- Q REDOX REACTION:C6H12O6 + 6O2---> 6CO2 + 6H2O + Energy-Could you tell me which compound is oxidized and which compoundis reduced and why? I would really appreciate if you drew it...
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