Chemistry question and answers for September 17, 2023
- Q CH 15± Using the Equilibrium Constant1)Part AInitially, only A and B are present, each at 2.00 M.What is the final concentration of A once equilibrium isreached?Part BWhat is the final...
- Q An equilibrium mixture contains 0.6500.650 mol of each of theproducts (carbon dioxide and hydrogen gas) and 0.2000.200 mol ofeach of the reactants (carbon monoxide and water vapor) in a 1.00...
- Q Write the net ionic equation, including phases, for thedissolution of CaF2(s) inH3O+(aq).Make sure your reaction is balanced, and do not include anyspaces.
- Q Part AIf Kb for NX3 is 4.0×10−6, what is the pOHof a 0.175 M aqueous solution of NX3?Part BIf Kb for NX3 is 4.0×10−6, what is thepercent ionization of a...
- Q A solution contains 43.0 g of heptane (C7H16) and 46.0 g ofoctane (C8H18) at 25 ∘C. The vapor pressures of pure heptane andpure octane at 25 ∘C are 45.8 torr...
- Q b. Briefly explain the differences between a boundary surfaceand the radial distribution function for hydrogenic atoms.
- Q What are the significance of bandstructure (E-k) plots?Which information we can get from E-k plots (obtained from DFTanalyses) for materials? Please explain in details with somerelevant diagrams or plots.
- Q For the determination of the Fe in a Mohr's salt sample, do youexpect to obtain more accurate results, with the data obtain afterthe direct titration using the indicator or with...
- Q Calculate the amount of energy in kilojoules needed to change153 g of water ice at –10 ∘C to steam at 125 ∘C. The followingconstants may be useful: Cm (ice)=36.57 J...
- Q Hi, I had a quick question about hydrophobic and hydrophillicregions on a molecule.I am confused on how to know if a molecule, which has bothhydrophillic and hydrophobic regions, will be...
- Q Please explain how to solve and show all work! I'm extremelylost.Part 1:A 180,000 gal. swimming pool requires treatment with 8.85 L of7.00% \"by mass\" chlorinating solution to give chlorine level...
- Q 2.(3) Translate the following statement into a balanced chemicalequation.Three moles of calcium chloride react with two moles of sodiumphosphate to produce solid calcium phosphate and six moles ofsodium chloride.3.(3) 50.0...
- Q 25.0 mL of 0.200 M solution of HBr are mixed with 25.0 mL of0.200 M solution of NaOH in a constant pressure calorimeter. Thetemperature increases from 23.00 °C to 24.37...
- Q Ro-vib spectroscopy observe what type of molecule? What is hisenergy range? Measured molecule properties.
- Q at 25c the standard enthalpy of formation of HF(aq) is-320.1 kj/mol. of OH(aq) it is -229.6Kj/mol. of F (aq) it is -329.2Kj/mol.of H2O(l) it is -285.9Kj/mol.a. calculate the standard enthalpy...
- Q The boiling point of ethanolCH3CH2OH is78.50°C at 1 atmosphere. A nonvolatile,nonelectrolyte that dissolves in ethanol isestrogen (estradiol).  How many grams of estrogen,C18H24O2(272.4 g/mol), must be dissolved in265.0 grams of ethanol to...
- Q If a small amount of the benzoic acid measured fails to dissolvein the lauric acid, what impact would this have on the molecularweight calculated? Would it be too high or...
- Q Why is molecular bonding an important considerationinn the manufacture of plastics?
- Q Determine whether each of the following statements about thethermodynamic functions are True or False as they apply to chemicalreactions.1.The heat of reaction at constant volume is never equal to theheat...
- Q Will combining Thr and Phe into the dipeptide Thr-Phe willrelease a molecule of water?Please show work, thank you!
- Q In the study of biochemical processes, a common buffering agentis the weak base trishydroxymethylaminomethane, (HOCH2)3CNH2, oftenabbreviated as Tris. At 25 ?C,                Trishas a pKbof 5.91. The hydrochloride of Tris is (HOCH2)3CNH3Cl,which...
- Q Something that burns is said to be flammable. Do you think steelwool is flammable? is it readily flammable in air? in oxygen? whatsort of differences to you observe?
- Q What volume of a 0.1 M NaOH solution must be combined with 25 mLof 0.2 M HNO3 to reach a pH of 11.5?
- Q At equilibrium, the rate of the forward reaction is equal to therate of the reverse reaction. Both the forward and the reversereactions are occurring, but because they are occurring at...
- Q Relative strengths of acids:Can an Organic Chemistry I and II MASTER explain to me somerules of thumb in regards to the relative strengths of acids.1) List the functional groups (alcohols,...
- Q Determine the solubility of silver chloride in 0.10 M sodiumchloride solution. The Ksp for silver chloride is 1.1 x10-10.
- Q Determine the pH during the titration of 25.4mL of 0.346 M HI by0.346 M NaOH at the followingpoints:(a) Before the addition of any NaOH(b) After the addition of 12.7 mL...
- Q Set IHMRARelative ConcentrationMethyl RedAbsorbance (a.u.)at 425 nmA01.000.094A10.750.058A20.500.041A30.250.030Set IIHMRARelative ConcentrationMethyl RedAbsorbance (a.u.)at 520 nmA01.000.895A10.750.806A20.500.597A30.250.224Set IMR-BRelative ConcentrationMethyl RedAbsorbance (a.u.)at 425 nmB01.000.480B10.750.302B20.500.243B30.250.052Set IIMR-BRelative ConcentrationMethyl RedAbsorbance (a.u.)at 520 nmB01.000.048B10.750.033B20.500.023B30.250.017Based on the data above, calculate...
- Q A buffer is prepared by adding 150 mL of 1.0 M NaOH to 250 mL of1.0 M NaH2PO4. How many moles of HCl must beadded to this buffer solution to...
- Q Consider the dissolution of calcium hydroxide:Ca(OH)2(s) --> Ca2+(aq) + 2OH‑(aq)K = 4.7 x 10‑6Write the equilibrium expression for this reaction.2. Identify whether the following actions would favor theformation of products,...
- Q 2 NO(g) + Cl2(g) --> 2 NOCl (g)Two proposed mechanisms for the reaction are given below. Whichis the better mechanism? Explain both why the better mechanism isbetter and why the...
- Q Tartaric acid is a diprotic acid (H2T) present in many fruitsand isused in cosmetics due to its powerful depigmenting effect.Therefore, it ispresent in multiple facial creams whose pH is 5.2....
- Q The enzyme is studied in the presence of a different inhibitor(inhibitor B). In this case, two different concentrations ofinhibitor are used. Data are as follows:a) Determine the apparent Vmax at...
- Q Sodium sorbate (HS) and sodium benzoate (HBz) are additives usedtogetherin many foods to inhibit the growth of microorganisms. Inparticular, itthey are present in jams in the following amounts, sodiumsorbate(150.22 g...
- Q Write a molecular equation for the precipitation reaction (if any)that occurs when the following solutions are mixed. If no reactionoccurs write noreaction. Express answer as a chemical equationIdentify all the...
- Q You need to prepare an acetate buffer of pH 5.31 from a 0.809 Macetic acid solution and a 2.81 M KOH solution. If you have 880 mLof the acetic acid...
- Q Calculate the percent ionization of hypobromous acid (HBrO) insolutions of each of the following concentrations (Ka =2.5e-09.)(a) 0.142 M= %(b) 0.448 M= %(c) 0.625 M= %
- Q For the reaction A+B+C→D+EA+B+C→D+E, the initial reaction ratewas measured for various initial concentrations of reactants. Thefollowing data were collected:Trial[A][A](MM)[B][B](MM)[C][C](MM)Initial rate(M/sM/s)10.300.300.309.0×10−520.300.300.902.7×10−430.600.300.303.6×10−440.600.600.303.6×10−4Rate law equationThe rate of a chemical reaction depends on the...
- Q Differentiate between total ion chromatogram (TIC) and extractedion chromatogram (EIC). Why quantification of analytes is carriedout through integration of EIC?Selected ion monitoring (SIM) is often used in determination ofanalytes at...
- Q 1.           Consider the following redox reaction to produce methanol:                                   2CH4(g) + O2(g) -->2CH3OH(g).a. Calculate the change in enthalpy for the reaction at standardconditions using bond dissociation energies. See the b. appendixfor the...
- Q Describe the physical effects and interferences that the methodof standard additions would correct or compensate for in AAS.this question came straight from the textbook... no otherexplanation was given
- Q In a titration of 47.63 mL of 0.3786 M nitrous acid with 0.3786M aqueous sodium hydroxide, what is the pH of the solution when47.63 mL of the base have been...
- Q Pentyl Ethanoate, CH3COOC5H11, which smells like bananas, isproduced from the esterification reaction:CH3COOH(aq) +C5H11OH(aq) → CH3COOC5H11(aq) + H2O(l)A reaction uses 3.58 g of CH3COOH and 4.75 g of C5H11OH and hasa...
- Q THIN LAYER CHROMATOGRAPHY OF ANALGESICSIntroduction:Analgesics are compounds that relieve pain. They range from overthe counter drugs such as aspirin, which is consumed at a rate of40 million pounds per year,...
- Q #6. A 130.0 mL buffer solution is 0.110 molL−1 in NH3 and 0.125molL−1 in NH4Br.A) What mass of HCl will this buffer neutralize before the pHfalls below 9.00? (Kb(NH3)=1.76×10−5)B)If the...
- Q A 1.5-Liter solution contains 45.0 mL of ethylene glycol. Whatis the volume percent of ethylene glycol in the solution?In which group are ALL the molecules capable of hydrogenbonding?C6H14, I2,CO2HF, NH3,...
- Q Please answer the following questions regarding hydroxyapatite.Please show all work.a.)Â Â Â How many atoms are in the unit cell forHap?b.)Â Â Â What are the unit cell parameters? Pleaseuse the attached diagram to...
- Q A flask is filled with 4.0 atm of gaseous H2and 3.0 atm of gaseous N2. When a lit match is throwninto the flask, the gases react and form gaseous NH3.What...
- Q A solution was prepared by dissolving 39.0 g of KCl in 225 g ofwater.Part A:Calculate the mole fraction of the ionic species KCl in thesolution.Express the concentration numerically as a...
- Q Shown below is an oxidation-reduction reaction in acidicsolution. Which of the following correctly balances thereaction?ClO−4+Rb→ClO−3+Rb+Select the correct answer below:A. ClO−4+Rb+2H+→ClO−3+Rb++H2OB. 2ClO−4+Rb+4H+→2ClO−3+Rb++2H2OC. ClO−4+2Rb+2H+→ClO−3+2Rb++H2OD. ClO−4+3Rb+2H+→ClO−3+3Rb++H2O
- Q 16.636 g of a non-volatile solute is dissolved in 410.0 g ofwater.The solute does not react with water nor dissociate insolution.Assume that the resulting solution displays ideal Raoult's lawbehaviour.At 90°C...
- Q A 4.00 ( ± 0.01 ) mL Class A transfer pipet is used to transfer4.00 mL of a 0.255 ( ± 0.004 ) M Cu 2 + stock solution to...
- Q The bond disssociation of O2 is 498kJ/mol(i.e., it requires 498 kJ to take one mole ofO2 molecules and break the bonds to make two moles of Oatoms). What wavelength photon,...
- Q 1.0 mol of Cu(NO3)2 is dissolved in 1000 g of water. What is themolality of the solution for use in colligative property equations?The answers are 1, 2, 3, 4, or...
- Q What does Retention Factor (Rf) mean if its high or low?For instance, if red dye in water has a high Rf compared topropanol and NaCl, does that mean water is...
- Q A 1.00 L buffer solution is 0.150 M CH3COOH (pKa = 4.74 ) and0.200 M NaCH3COO. What is the pH of this buffer solution after0.0500 mol KOH are added?
- Q Calculate the time of arrival of singly charged cations withmasses 14, 15, 28, 32, 550, and 551, when the ions are acceleratedwith 10,000 V and distance to the detector is...
- Q If the mixing ratio of carbon dioxide is 404 ppmv and the numberdensity of air is 2.69x1025 molecules m-3,determine the mass density.Question 24 options: show work8 x 10-4 kg m-34.7...
- Q Which statements regarding weak bonds are true?A) Represent the bonds that hold water molecules together inliquid stateB) Are what hold the three-dimensional structures of proteins,nuleic acis, and lipid membranes togetherC)...
- Q With the aid of a simple schematic describe the principle ofoperation of a linear time of flight mass analyzer (LTOF).
- Q Assuming that 1.00 L of 4% PVA solution is spread out to form athin sheet of thickness equal to the average length of a PVAstrand, calculate the total area of...
- Q why does cross linking affect solubility, meltviscosity, recyclability, modulus, and service temperture?
- Q Exactly 47.0 mL of 0.2 M HNO2 are titrated with a 0.2M NaOH solution. What is the pH at the equivalence point ?
- Q solutions may be formed through exothermic And endothermicprocesses. What accounts for this difference?
- Q What is the pH when 50 ml of 0.040 M NaOH is mixed with 50 ml of0.040 M HN3 (Ka= 1.9*10^-5)
- Q Balance the following equation, remove all mole fractionsC5H12O +K2Cr2O7 +H2SO4 =Cr2(SO4)3 +C2H4O2 +K2SO4 + H2OI need the half reaction 1, half reaction 2, and the completebalanced equation (with K+ andSO42-)Please...
- Q Please give answer andexplanation !Consider the following reaction: CH4 (g) + 2O2 (g)----------}CO2(g) + 2H20(g) ^Hr= -890 kja) is heat absorbed or evolved in the course of thereaction?b) Calculate the...
- Q The vapour pressures of acetone and benzene at 65oCare 580mmHg and 475mmHg respectivelyif 5.8g of acetone is mixed with 15.6g of benzene what is thetotal vapour pressure at 65oCWill this...
- Q other than a counterfeit detection pen, how is chemistry beingused in counterfeit money detection , and give details aboutpreventative measures that involve application of chemistry
- Q Calculate the pH for each case in the titration of 50.0 mL of0.200 M HClO(aq)0.200 M HClO(aq) with 0.200 M KOH(aq).0.200 MKOH(aq). Use the ionization constant for HClO.HClO.What is the...
- Q 1. Write chemical equations to illustrate the reactions ofbromine with cyclohexane, toluene, chlorobenzene, and cyclohexane(NR if no reaction)2. What type of reaction is occurring between cyclohexane andpotassium permanganate? What is...
- Q For the following question, please explain specifically what itis you're doing for each step/where your number iscoming from (ex.: 1. calculating molar mass... 2. Diving bymoles...etc)... This will help me...
- Q True or FalseThe citric acid cycle consumes more energy than it produces.
- Q For the following procedure, write a balanced chemical equationfor each reaction. Make sure you include the state of matter(s,aq,g,l) and the type of reaction (decomposition, synthesis,single displacement, double displacement, combustion).Reaction...
- Q 8A : Consider the titration, 10 mL of NaCN(Ka=4.9X10^-10) with.380M HCl. Calculate pH at 0.0mL HCl, 11.82mL HCl.8B How many mL HCl is needed to reach the equivalence point andwhat...
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