Chemistry question and answers for September 04, 2023
- Q why did my prof chose to right the stoichiometry of thecombustion reaction for propane like this:1/20 C3H8(g) + 1/4 O2(g) --> 3/20 CO2(g) + 1/5H2O(l)why did he write it in fractions, and...
- Q Ethane is chlorinated in a continuous reactor: C2H6 +Cl2 →C2H5Cl + HCl Some of the product monochloroethane is furtherchlorinated in an undesired side reaction: C2H5Cl +Cl2 → C2H4Cl2 +HCla. Take...
- Q Pure pools of benzo [a] pyren and p-xylene are found floating inthe Groundwater. What concentrations do you expect to finddissolved in the water directly belo the pools (mg/L and mM)?...
- Q a) How many moles ofAl2(SO4)3 arerequired to make 45 mL of a 0.080 MAl2(SO4)3 solution?(Hint, molarity is moles per liter. You know the molarity. Youare given the number of mL's,...
- Q Fe(NO3)3. 9H2O in 0.5M HNO3forms a colorless hexa-aquocomplex with the chemical formula{Fe(H2O)6}3+ (aq).This complex can then undergo an equilibrium reaction withpotassium thiocynate (KSCN) to form a red complex with the...
- Q Consider the titration of 20.0 mL of 0.0800 M C5H5N (a weakbase; Kb = 1.70e-09) with 0.100 M HCl. Calculate the pH after thefollowing volumes of titrant have been added:(a)...
- Q Let 4 moles of methanol (liquid) combust in 3 moles of gaseousoxygen to form gaseous carbon dioxide and water vapor. Suppose thisoccurs in a chamber of fixed volume and fixed...
- Q consider space group Fdd21) What is point symmetry of an atom located at (0,0,Z)2) give d-glides coordinates of Fdd23) what is multiplicity at a general position on Fdd24) Give a...
- Q Band Theory(A) Give a brief description of the formationof electron bands in crystals including reference to the atomicstructure of the constituent atoms.(B) Explain the followingi.Sodium, which has 2 atoms in...
- Q consider space group Fdd21) What is point symmetry of an atom located at (0,0,Z)2) give d-glides coordinates of Fdd23) what is multiplicity at a general position on Fdd24) Give a...
- Q (a) Calculate the percent ionization of 0.00690 M hypochlorousacid (Ka = 3e-08). % ionization =(b) Calculate the percent ionization of 0.00690 M hypochlorousacid in a solution containing 0.0300 M sodium...
- Q 3. Assume that a particle is confined to a box of length L, andthat the system wave function isψ(x)=sqrt(2/L)*sin[(π*x)/(L)](1) Is this state an eigenfunction of the momentum operator? Showyour work.(2)...
- Q 1.a) Band theory is used to explain the conductivity of differentsolid crystals. Define the band width and calculate s band widthassuming there is indefinite number of molecular orbitals in the...
- Q 0.1 M NaOH is titrated with 25 mL acetic acid. The equivalencepoint was reached at 23.25 mL.a) Based on your experimentally observed equivalence point of23.25 mL, calculate the original concentration...
- Q Temperature and Phase Changes In this exercise, you will makeobservations of the phase changes of water (H 2 O). You willmeasure temperature and create a heating curve to determine themelting...
- Q 1. Calculate the pH when 24.9 mL of 0.011 M HCl is added to100.0 mL of the above buffer.2. Calculate how many mL of 0.100 M NaOH are needed toneutralize...
- Q Determine the pH of each solution.a) 0.0200 M HClO4b)0.120 M HClO2 (for HClO2, Ka=1.1×10−2)c)0.050 M Sr(OH)2d)0.0856 M KCN (for HCN,Ka=4.9×10−10)e)0.165 M NH4Cl (for NH3,Kb=1.76×10−5)
- Q 1. Draw the Lewis structure, determine the moleculargeometry and electronic geometry, hybridization, and bond angles ofthe following molecules: ICl2-, SnCl3-2. Draw the energy diagram for aluminum and indicatewhich ones are...
- Q What detector system would be best to use for I-131 in a mixtureof all the I isotopes? Explain why.
- Q Please use sig figs and dimensional analysisand explain process!1. Dissolve 69.0 g NaNO2 in 1.00 x 102 mLH2O.(a) If the temperature of the solution is 100°C, what is thevapor pressure...
- Q define variables in sin(theta)= (n * lamda)/d for Chemicalgrating, Emission spectra
- Q Consider the following equilibrium.CS2(g) + 3 O2(g) equilibrium reaction arrow CO2(g) + 2 SO2(g)If the reaction is started in a container with 5.59 atm CS2 and13.3 atm O2, what is...
- Q 1) An aqueous solution contains 0.34 Mnitrous acid.One Liter of this solution could be converted into a buffer by theaddition of:(Assume that the volume remains constant as each substance isadded.)0.17...
- Q Calculate the pH and the pOH of an aqueous solution that is0.025 M in HCl ( aq ) and 0.085 M in HBr ( aq ) at 25 °C.p H...
- Q Would the pH of a solution made by dissolving the following solidsin water be less than 7, be equal to 7, or greater than 7? Explain.A) NaClB) NaFC) AlCl3
- Q A sample weighing 3.082 g is a mixture of Fe2O3 (molar mass =159.69) and Al2O3 (molar mass = 101.96). When heat and a stream ofH2 gas is applied to the...
- Q Calculate the theoretical yield of Cu(NH3)4SO4∙H2O (MW =245.7g/mol) based on 10.0g of CuSO4∙5H2O (MW = 249.7g/mol).
- Q Calculate ΔH° for the reaction C4H4(g) + 2H2(g) → C4H8(g), usingthe following data:ΔH°combustion for C4H4(g) = –2341 kJ/molΔH°combustion for H2(g) = –286 kJ/molΔH°combustion for C4H8(g) = –2755 kJ/molA) –128 kJB)...
- Q Paper chromatography lab experiment. (color dye)in the solvent system that you use for analyzing your unknowna)name the important intermolecular forces acting between the dyeand the solvent and b)the dye and...
- Q in boiling point determination, you first raise the temperatureuntil bubbles starts to come out of the glass bell. at thistemperature when bubbles are coming out of the glass bell, is...
- Q 1.)Glucose has a solubility of 125 g /100 mL. What is theapproximate concentration of glucose in a saturated solution? Howmuch glucose can be dissolved in 745 mL of water?Glucose_____MGlucose_____g2.) Determine...
- Q Calculate the cell potential for the following reaction aswritten at 25.00 °C, given that [Zn2 ] = 0.763 M and [Sn2 ] =0.0140 M. Standard reduction potentials can be found...
- Q The H2 antagonist burimamide showed poor bioavailability inclinical trials.(i) Define the term bioavailability. In your answer, distinguishbioavailablilityfrom bioactivity.(ii) Protonation of the imidazole ring was identified as a reasonfor the lowbioavailability...
- Q Propane (C3H8) is often used for barbeque and heating.(a) Determine the density (in g/L) of propane at STP assumingpropane behaves as an ideal gas.(b) Determine the density (in g/L) of...
- Q Most stars, including our own sun, undergo nuclear fusion usinghydrogen as the primary fuel source. Some stars, however, usehelium, carbon, or other elements as their primary fuel, and allstars will...
- Q Your project should be on temperature adaptation orthermostability of proteins.For a temperature adaptation project select an ectothermicorganism with sub-species living in different climates. You willthen focus on one protein, preferably...
- Q How many grams of dry NH4Cl need to be added to 1.80 L of a0.600 M solution of ammonia, NH3, to prepare a buffersolution that has a pH of 8.96?...
- Q When Chlorine gas is used to disinfect drinking water, ithydrolyzes with the water to form hypochlorous acid (HOCl, pKa =7.54), which is a powerful disinfectant. However, when the aciddissociates to...
- Q Your lab is supplied with 1.500 F solutions of HCL, NaOH, aceticacid, (Ka = 1.75x10-5) sodium acetate. Prepare a 400.0mLo a 0.1000M acetate buffer: pH 4.622 using specified reagentsa) 1.000...
- Q Pre-lab questions for a Saponification lab:A student assembled the reflex apparatus. Later the joint wasseized and the RBF had to be broken to disassemble the apparatus.What was the cause of...
- Q A) Explain the general responses of ceramics, metals andpolymers to mechanical and electrical loads in terms of bothprimary and secondly chemical bondsB) Classify the following materials as a polymer, metal,ceramic,...
- Q Explain in detail endothermic and exothermic energy and how itis in chemistry and provide examples of each
- Q 11.A 150.0 mL solution of 2.713 M strontium nitrate is mixed with220.0 mL of a 2.401 M sodium fluoride solution. Calculate the massof the resulting strontium fluoride precipitate.mass: gAssuming complete...
- Q Complete the stoichiometry of each reaction, making sure bothstoichiometry and charge balance are correct. That is, find thevalues of the coefficients A, B, C, etc., for each reaction. Showyour work...
- Q A sample of concrete with a density of 2.35 g/cm3 hasa hydrogen content of 0.0085 weight fraction. a) what is the atomdensity of hydrogen in the concrete? b) what is...
- Q Silicon dioxide and solid carbon react to form solid silicon andcarbon monoxide.What is oxidized?
- Q Natural gas is primarily methane, CH4, and is used to heathomes. A typical home is approximately 2000 ft2 and the ceilingsare 8 ft high. The following data may be helpful:...
- Q 2. How would Evelyn Effec affect the products formedfrom the dehydration of 2-methylhexanol (My product is1-methylcyclohexene)? How could you modify the experiment to checkfor the Evelyn Effect?
- Q Why is copper sulfate (CuSO4 ) not commonly found as anaturally-occurring copper ore mineral, even though it is easilymade during leaching of other copper minerals?
- Q why do atoms aproach each other?
- Q Calculate the volume of nitrogen dioxide produced at 712.5 torrand 23.3°C by the reaction of 7.85 cm3 copper (density = 8.95g/cm3) with 207.3 mL of concentrated nitric acid if the...
- Q Show all work for life saving rating *****Make separate (50ml) of .05M chromium (III) nitrate and a 0.20MCobalt (II) nitrate in distilled water.After making the stock solution make five standards...
- Q Which of the following would be expected to lower the Tm for aphospholipid bilayer?replacing a lipid containing unsaturated fatty acids with onecontaining saturated fatty acids.replacing a lipid containing 18-C fatty...
- Q Two 20.0 g ice cubes at −11.0 ∘C are placed into 225 g of waterat 25.0 ∘C. Assuming no energy is transferred to or from thesurroundings, calculate the final temperature,...
- Q 1.Rank the following element from the least electronegative (1) tomost electronegative (6)SiCaPBaFN2. A chemical bond between which of the following elementswhold be considered nonpolor covalent? (select all theapply.)A) H-CB) C-OC)...
- Q Saturated steam at 100 C is heated to 400 C. Use the steam tableto determine the required heat input if continuous stream flowingat 150 kg/min undergoes this process at constant...
- Q 4.60 mol of solid A was placed in a sealed 1.00-L container andallowed to decompose into gaseous B and C. The concentration of Bsteadily increased until it reached 1.10 M,...
- Q Please answer both questions.One millimole of Ni(NO3)2 dissolves in270.0 mL of a solution that is 0.400 M in ammonia.The formation constant ofNi(NH3)62+ is5.5×108.1. What is the initial concentration ofNi(NO3)2 in...
- Q Consider the reaction2AgNO3(aq) + H2SO4(aq) -> Ag2SO4(s) + 2HNO3(aq)You combine 2.33ml of 1.77M AgNO3(aq) and 1.77mL of 2.33MH2SO4(aq) and the react according to the reaction above. a)How manygrams of Ag2SO4(s)...
- Q I'm confused on how bonding works with metalloids. Will it be anionic or covalent bond? For example P and As
- Q Consider the reaction shown. Suppose Meredith started with 0.51g of sodium bromide, and 0.46 mL of 2,3-dimethylbutane for herreaction. Assuming the 2,3-dimethylbutane is the limiting reactant,how many grams, in theory,...
- Q Sketch the appearance of the 1 H-NMR spectrum of diethyl etherusing J = 6.97 Hz and the data in Q2 in a spectrometer operating at(a) 350 MHz, (b) 650 MHz.
- Q Calculate the pH of the solution after the addition of thefollowing amounts of 0.0536 M HNO3 to a 60.0 mL solution of 0.0750M aziridine. The pKa of aziridinium is 8.04.a)...
- Q Balance these equations for reactions occurring in a basicsolution. Don't include physical states for your answer.CrO2- +S2O82- →CrO42- + SO42-Au + CN- + O2 →Au(CN)4- + OH-
- Q Determine the pH of an aqueous solution ofFe(CN)63-, prepared using FeCl3and NaCN with formal concentrations of 0.001832 M and 0.5120 M.logKf(Fe(CN)63-) = 43.6Ka(HCN) = 6.2x10-10
- Q Q2: When 500.0 mL of 2.00 M Ba(NO3)2 solution at 25.0 °C ismixed with 500.0 mL of 2.00 M Na2SO4 solution at 22.0°C in acoffee-cup calorimeter, the white solid BaSO4...
- Q A mixture is prepared using 27.00 mL of a 0.0774 M weak base(pKa = 4.635), 27.00 mL of a 0.0581 M weak acid (pKa = 3.189) and1.00 mL of 0.000116...
- Q Instructions: For each part...Calculate the theoreticalyield and percent yield. Then calculate the overallyield.I am really struggling with this and have been working on it forawhile. Could you please show a...
- Q In the distillation apparatus, it is important that the bulb ofthe thermometer is placed below the sidearm of the still head.Briefly explain why the thermometer placement is so important.
- Q Trichloroethene (TCE) is a common groundwater contaminant. Interms of cancer risk, which would be better:(1) to drink un-chlorinated groundwater groundwater with 10 ppbTCE, or (2) drink surface that, as aresult...
- Q adding a solute to a slovent lowers the freezing point of thesolvent. if we decreased the mass of the solute, would that alsodecrease the freezing point?
- Q A student performed the synthesis of aspirin. After weighingtheir product, they had 0.501g of product. They took 0.250g of thisproduct and diluted it to 250mL as instructed, and then used...
- Q When the following equation is balanced properly under acidicconditions, what are the coefficients of the species shown? Ag+ +Mg-->Ag + Mg2+ Water appears in the balanced equation as a(reactant, product,...
- Q When the following skeletal equation is balanced under basicconditions, what are the coefficients of the species shown? SiO32-+ Br- --> Br2 + Si Water appears in the balanced equation as...
- Q Phosphorus pentachloride decomposes at higher temperatures.PCl5(g) ⇄ PCl3(g) + Cl2(g)An equilibrium mixture at some temperature consists of3.03 g PCl5, 208.23 g/mol4.86 g PCl3, 137.33 g/mol3.59 g Cl2, 70.91 g/molin a...
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