Chemistry question and answers for July 28, 2023
- Q A student followed the procedure of this experiment to determinethe percent NaOCl in a commercial bleaching solution that was foundin the basement of an abandoned house. The student diluted 50.00...
- Q a) Predict in which direction the following reactions willproceed. Justify your answers briefly.I. HCl + NaF ---- HF + NaClII. AlBr3 + 3 NaF ---- AlF3 + 3 NaBrIII. Ti(OMe)4...
- Q a) Which of the following reagents would oxidize Fe to Fe2 , butnot Ag to Ag?Ca, Co, Br-, Ca2+,Co2+,Br2b) Which of the following reagents would oxidize Cu to Cu2 ,...
- Q In his explanation of the threshold frequency in thephotoelectric effect, Einstein reasoned that the absorbed photonmust have the minimum energy required to dislodge an electron fromthe metal surface. This energy...
- Q At 1 atm, how many moles of CO2 are released by raising thetemperature of 1 liter of water from 20?C to 25?C?
- Q Enzyme X is a highly pigmented protein that imparts thecharacteristic color to certain blue-green algae. It alsofacilitates a reaction necessary to the survival of this species;we can follow the kinetics...
- Q free energy changed also depends on concentration. for gases,how is G related to the pressure for gases? what are standardstandard pressures for gases and standard concentrations forsolutes? how do you...
- Q what is the theoretical yield for the reaction between 1-hexeneand Hbr? .5mL of 1-hexene used, and 5mL of 1.8M HBr.What is the theoretical yield for the reaction between3,3-dimethyl-1-butene and HBr?...
- Q What is the difference between UV-vis fluorescence and UVabsorption (please be detailed with your response and explain thecorrelation between the two as well as their distinctproperties)?
- Q Describe a chemical test that could be used to distinguishbetween pent-1-ene and pentane.................................................................................................................................................Explain, using equations, the following steps in thefree-radical mechanism of the reaction of methane withchlorine.•       Initiation•       Propagation•       Termination................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
- Q In the blood plasma, pH is maintained by the carbonicacid-bicarbonate buffer system. Explain how pH is maintained when(a) acid is added to the buffer system, (b) base is added to...
- Q How many grams of each product result from the followingreactions, AND how many grams of each reactant is left over?(Shntould be three amounts left over for each equation)1) ( 1.3...
- Q For carbon-14, calculate the mass defect and the binding energy.Please explain to me where you get the numbers from.
- Q if the liquid did not completely vaporize in the experimentwould the apparent molecular weight by larger, smaller or unchangedcompared to that determined if the experiment had been properlyperformed?
- Q What other data or indicator must the technologist use to assesswhether or not an insufficient or excessive amount of radiation hasbeen used to produce a diagnostic radiograph ? Explain.(Radiologic question)
- Q Structure of C8H10O2 with one 4H singlet at 7 ppm, one 4H singletat 4.7 ppm, and a 2H singlet at 2.99
- Q 1.) Electron Spin Quantum NumberWhat values can this number have? What information does itprovide? (Be complete in your answer.)
- Q What is the purpose of the experiements determining thedissociation constant of a weak acid using ph measurement andmonitoring acid-base titrations with a ph meter? We combined bothexperiements together into one,...
- Q The hydroxide ion has the formula OH?. The solubility-productconstants for three generic hydroxides are given here.Generic hydroxideKspXOH1.60
- Q What is the pH at the equivalence point of the titration of0.150 L of 0.500 M formic acid with 30.0 mL of 2.50 M sodiumhydroxide. Ka = 1.8 X10^-4
- Q Broadband-decoupled CNMR spectra for three compounds with themolecular formula C3H8O are shown in Figure 23.15 (Mohrig 4th ed).Deduce the structure of each compound, estimate the chemical shiftof each of its...
- Q Which of the following experimental methods cannot be used tomeasure the rate of a reaction?a. measurement of the change in the partial pressure of agas-phase reactant over timeb. measurement of...
- Q 11-Which of the following does NOT regulate biochemicalreactions?A. Regulation of enzyme amounts.B. Regulation of access of substrates to certaincompartments.C. Alteration of ï„Go' by raising or lowering reactantconcentrations. D. Regulation of...
- Q Consider the following reaction :Fe3+ (aq) + SCN- (aq) --->Fe(SCN)2+ (aq)Starting with 4.00 mL of .200 M Fe3+ (aq) in acuvette, 0.10 mL increments of 0.00100 M SCN- (aq) willbe...
- Q what are ∆U, ∆H, ∆G, ∆A, ∆S, ∆Ssur, q and w for the followingchanges involving a perfect diatomic gas – if all changes arereversible –(a) isentropic change(b) isochoric change(c) isobaric...
- Q Using the Line-Angle structure of morphine, circle or highlightall polar regions of the molecule. Make a reasonable predictionabout whether your molecule will be soluble in water or not.Explain your reasoning....
- Q \"Low concentrations of dioxin near the detection limit gave thefollowing dimensionless instrument readings: 193.3, 156.5, 150.3,162.3, 207.3, 148.1, 211.1, 189.7, 122.7, and 193.5. Ten blanks hada mean reading of 47.3....
- Q Ag+ is complexed by the chelating ligandtrien (triethylenetetramine,NH2(CH2)2NH(CH2)2NH(CH2)2NH2).Ag+ + trien ⇌ Ag(trien)+Kf = 5.0×10740.8 mL of 0.0273-M trien solution is added to 25.0 mL of0.0146-M silver nitrate solution.What is [Ag+]...
- Q 1.) Principal Quantum NumberWhat values can this number have? What information does itprovide in relation to an electron? (Be complete in youranswer.)
- Q The following data was generated for an isolated mammaliandihydrofolate reductase.[7,8-dihydrofolate](mM)         V(mol/s)               V (mol/s) with methotrexate               1.1                                 333                                     169               2.0                                 444                                     265               5.0                                 667                                     465A.       Graph the data withand without methotrexate on a Lineweaver-Burk plot. Clearly labelwhich line is which.B.       CalculateKm...
- Q 1.The reaction of aluminum metal (Al) with oxygen (O2) formsAl2O3. Write a balanced equation for this redox reaction. Write twohalf reactions to show how many electrons are gained or lost...
- Q 1)Suppose the reactionCa3(PO4)2 +3H2SO4 → 3CaSO4 +2H3PO4 is carried out starting with 149 g ofCa3(PO4)2and 91.0 g of H2SO4. How much phosphoric acidwill be produced?2)For the reaction N2(g) +2H2(g) →N2H4(l),...
- Q 1. What answer should be reported, with the correct number ofsignificant figures, for the following calculation? (433.621 -333.9)
- Q A buffer is prepared by adding 300.0 mL of 0.050 M Ch3COONa to a500.0 mL of 0.100 M CH3COOH. What is the pH of this buffer?Ka=1.8x10^-5What is the pH of...
- Q For each of the reactions, calculate the mass (in grams) of theproduct formed when 3.26g of the underlined reactant completelyreacts. Assume that there is more than enough of the otherreactant.Part...
- Q How many microliters of a 872.0 ppm Co2 stock solution arerequired to prepare 19.00 mL of a 13.0 ng/μL Co2 solution?W/ Correct Sig Figs
- Q For a particular redox reaction MnO2 is oxidized to MnO4– andCu2 is reduced to Cu . Complete and balance the equation for thisreaction in basic solution. Phases are optional.This is...
- Q Liquid (anhydrous) ammonia, NH3(l), with a boilingpoint of –33 °C, is often used as an alternate solvent to water. Itforms strong hydrogen bonds and the polar molecules can solvateionic compounds....
- Q Part A:Consider the titration of a 28.7 mL sample of 0.117 M RbOH with0.186 M HCl.Calculate the volume of added acid required to reach theequivalence point.Express your answer to 3...
- Q Twenty-five milliliters of liquid nitrogen (density = 0.807g/mL) is poured into a cylindrical container with a radius of 11.3cm and a length of 17.6 cm . The container initially contains...
- Q How would you drive a reaction thatis endothermic and has a greater number of gaseous reactants thangaseous products?
- Q A500 mL sample of Argan at 600 torr has its absolute temperaturequadrupled. if the volume remains unchanged what is the newpressure? Show calculations
- Q GC Analysisa) is best done on solids dissolved in a volatile solventb) on neat high melting solidsc) on neat volatile liquids or solidsd) none of the aboveI just want to...
- Q How many grams of Mg(OH)2 will be needed to neutralize 25mL ofstomach acid if stomach acid is .10M HCL?How many mL of a .10 M NaOH solution are needed to...
- Q Question 13:Automobile airbags contain solid sodium azide, NaN3, that reactsto produce nitrogen gas when heated, thus inflating the bag.2NaN3(s)--->2Na(s)+3N2(g)Calculate the value of work, w, for the following system if39.6g of...
- Q You are the brewmaster at a local craft brewery. In an effort tocut costs, you have been tasked to develop a procedure to recoverthe carbon dioxide generated during the fermentation...
- Q Molecule A has hydrogen bonds; Molecule B is non -polar. Which of the molecular liquids will have the higher boilingpoint? Why? Also, which of the molecular liquids will have thelower...
- Q Use the density and molecular weight of limonene, linalool, andnonane to calculate the volumes of the compounds you will need tomake the stock solution of 50 mM.Also calculate the final...
- Q You want to know how many different products were produced by anew reaction you have devised. You spot the product mixture on aTLC plate and develop it in petroleum ether...
- Q At equilibrium, the concentrations in this system were found to be[N2]=[O2]=0.200 M and [NO]=0.500 M.N2(g)+O2(g)<----->2NO(g)If more NO is added, bringing itsconcentration to 0.800 M, what will the final concentration of...
- Q Silver bromide, AgBr (s), is an essential reagent inblack and white film developing. It is,however, only sparingly soluble in water. AgBr (s) hasK = 5.0 × 10-13, making it difficult...
- Q You have to prepare a ph 3.50 buffer, and you have the following0.10M solutions available: HCOOH, CH3COOH,H3PO4,HCOONa, CH3COONa,and NAH2PO4. Which solutions would you use? How many milliliters ofeach solution would...
- Q 31. What is the initiator in the polymerization of isobutylene?
32. What is the general name of the product produced by cationicinitiation? 
33. What reactant besides the monomer is present in...
- Q Why is platinum the element of choice to study the transeffect?
- Q 1/ Calculate the volume of 0.280-M NaOHsolution needed to completely neutralize 27.4 mLof a 0.560-M solution of themonoprotic acid HBr.2/ To determine the molar mass of an organic acid, HA,...
- Q What mass of a solid hydrate of iron (III) sulfate that is 76.3%by mass iron (III) sulfate is needed to supply 1.00 g of iron (III)ion? How many moles of...
- Q At 300K, the vapor pressure of pure liquid A and liquid B are37.33 kPa and 22.66 kPa respectively. If we mix 2 mol liquid A with2 mol liquid B, the...
- Q You are searching for an inexpensive synthetic route to makeanthraquinone to use it as the active component in a new laxativeformulation. Reaction of benzene and phthalic anhydride yielded ayellow solid...
- Q A certain weak acid, HA , has a Ka value of2.2×10−7.Part ACalculate the percent ionization of HA in a 0.10 Msolution.
- Q What is special about the equivalence point in a titration?
- Q In each of the following balanced oxidation-reduction equations,identify those elements that undergo changes in oxidation numberand indicate the magnitude of the change in each casePart A2MnO4−(aq)+3S2−(aq)+4H2O(l)→3S(s)+2MnO2(s)+8OH−(aq)Enter your answers as chemical...
- Q explain the observed absorption maxima of each of the followingmolecules:a) nitrobenzene, 252 nmb) 2-nitrotoluene, 250 nmc) 2-isopropylnitrobenze, 247 nmd) 2-t-butylnitrobenzene, no peakThey are all being observed in UV-vis spectroscopy (200...
- Q  Introduction: In this experiment, the following equilibrium system will be observed:Fe+3(aq)  +  SCN-(aq)  ↔  Fe(SCN)+2(aq)The reactants are both colorless solutions (the ferric ion is slightly colored, but it is treated...
- Q The specific rotation, [α]D, for (-)-2-butanol is +14. What isthe observed rotation for a solution of 1.0 g of (-)-2-butanol in10 mL of water in a sample tube having a...
- Q Calculate the pH after adding 5.00 mL of 0.15 M HNO3to 250 mL of an acetic acid/acetate buffer with an initial pH of4.32 and a total buffer concentration of 0.25...
- Q On a day with a temperature of 15∘C and a pressure of 792.0 torr , how many grams of peroxyacylnitrates are found in the air above Los Angeles (1500. km3)...
- Q A sample of helium gas at a pressure of 772 torr and atemperature of 22.7 °C, occupies a volume of 814 mL. If the gas isallowed to expand at constant...
- Q The decomposition of XY is second order in XYand has a rateconstant of 6.92×10−3 M−1⋅s−1at a certaintemperature.Part AWhat is the half-life for this reaction at an initialconcentration of 0.100 M?t1/2...
- Q An industrial chemist introduces 6.8 atm H2 and 6.8 atm CO2 intoa 1.00-L container at 25.0°C and then raises the temperature to700.0°C, at which Keq = 0.534: H2(g) + CO2(g)...
- Q The vapor pressure of an organic solvent is 50mmHg at 25 C and200mmHg at 45 C. The solvent isthe only species in a closed flask at 35 C and is...
- Q Explain how to find the concnetration of an unknown when thewhen five reference have a mixture of five different compounds. byinternal standard method
- Q Write the balanced molecular equation for any reaction thatoccurs when the following solutions are mixed.1. Ba(C2H3O2)2 andNa2SO42. NaClO4 and Pb(NO3)23. Mg(NO3)2 andNa3PO44. SrS and NiI2 (thats Nickel and Iodide)
- Q Calculate the pH for thetitration 20.00mL of 0.500M HF with 0.500M KOH at the followingvolumes of added titrant:a) 0.00 mL (before titration begins)b)10.00mL (at 50% equivalence)c) 19.00 mL (at 95%...
- Q A 0.500 M solution of a weak base has a pH of 9.00. What is thebase hydrolysis constant, Kb, for the weak base?
- Q Column Chromatography Lab1. What would happen if diethyl ether were put in the columnfirst instead of petroleum ether?2. The recrystallization lab required you to purify naphthalenewhich contained a small portion...
Get Answers to Unlimited Questions
Join us to gain access to millions of questions and expert answers. Enjoy exclusive benefits tailored just for you!
Membership Benefits:
- Unlimited Question Access with detailed Answers
- Zin AI - 3 Million Words
- 10 Dall-E 3 Images
- 20 Plot Generations
- Conversation with Dialogue Memory
- No Ads, Ever!
- Access to Our Best AI Platform: Flex AI - Your personal assistant for all your inquiries!