Chemistry question and answers for July 26, 2023
- Q During the titration of a particular acid, the PH changes from7.0 to 9.0 with the addition of 0.01mL of base. An indicator wasused that had KI= 1.0x10-8. Calculate the ratio...
- Q Write Lewis structure that obeys the octet rule for BrO−3 andassign formal charges to each atom.
- Q When the following reaction is balanced what is the coefficientfor -OH? ____N2H4 + ____ClO3- + ____-OH ----> ____NO3- + ____Cl-+ ____H2O(Please explain method step by step, this is a redoxreaction)
- Q A combustion gas has the following composition (by volume): 75%N2, 5.5% O2, 11% CO2,8.4% H2O, and 0.1% CO.a. What is the CO concentration in mg/dscm (dry standard cubicmeter)?b. What is...
- Q The vibrational energy levels of NaI lie at the followingwavenumbers: 142.81,427.31, 710.31, 991.81 cm-1.Show that they fit an expression ?e(v +
- Q Which of the following acids would be most suitable forpreparing a buffer of pH 3.10 and why: hydrogen peroxide (pKa=11.65), propanoic acid (pKa=4.874), cyanoacetic acid (pKa= 2.472),and 4-aminobenzenesulfonic acid (pKa=3.232)?
- Q A solution contains 2.2x10^-3 M Cu2+ and 0.33 M LiCN. If the Kffor Cu(CN)4^2- is 1.0x10^25, how much copper ion remains atequilibrium?
- Q Calculate the concentration of H+ in a 0.250 M solution ofoxalic acid. Consider only [H+] from the first ionization. (Ka =5.37 x 10^-2) Then calculate [H+] of the same solution,...
- Q 1) For the reaction, calculate how many grams of the productform when 24.4g of Br2 completely reacts.Assume that there is more than enough of the other reactant.2K(s)+Br2(l)?2KBr(s)2)For the reaction, calculate...
- Q Define the difference between each pair of terms:Isozyme vs. ZymogenHomotropic Effects vs. Heterotropic EffectsConsensus Sequence vs Pseudosubstrate Sequence
- Q Inorganic;You are attempting to synthesize some magnetic material usingeither Vanandium, Manganese or Cobalt and have available theligands pyridine, I-, CO, and OH-. What complexes(oxidation states, geometeries, etc.) might you expect...
- Q Titration of Na2CO3 with HCl. You may wantto record your answers in the Data Collection section of your labmanual for use during the lab.(pKa1(H2CO3) = 6.352,pKa2(H2CO3) =10.329).(a) What are the...
- Q In the saponification of methyl salicylate, how doesequilibrium of the reaction affect yield
- Q (a) To get a feel for how ∆mixGm varies with χAB, plot it forthe following values of χAB = 0, 1, 2, 3 (pick any temperature).(b) Verify that ∆mixGm obtained...
- Q 2NO (g) + O2 (g) -> 2 NO2 (g)if 12 moles of nitrogen monoxide are combined with 10 moles ofoxygen, how many moles of NO2 should form? I need step...
- Q Can nuclear bombs be made from reactor-grade uranium?Explain
- Q consider a galvanic cell that is set up under standardconditions and allowed to react.How many of the following responses are true?1. Electrons are produced spontaneously at the anodeelectrode2. Electrons will...
- Q A 0.02500 g sample of the diprotic acid malonic acid (H2C3H2O4)is dissolved in water to yield a 2.00 L solution. What is theresulting pH of the solution and the concentration...
- Q Balance these equations:HCl+CaCO3=HCl+Na2CO3=HCl+NaOH=NaOH+FeCl3=CoCl2+AgNO3=CuSO4+Na2CO3=CuSO4+BaCl2=Na3PO4+CuSO4=Na3PO4+NiCl2=Na3PO4+BaCl2=NH4Cl+AgNO3=
- Q Calculate the molar solubility and the solubility in g/L of eachsalt at 25oC:a) PbF2 Ksp = 4.0 x 10-8b) Ag2CO3 Ksp = 8.1 x 10-12c) Bi2S3 Ksp = 1.6 x...
- Q Lactic acid is very good at penetrating the skin. Because ofthis, it is used in a number of products for skin care, such asexfoliating creams and chemical peels, and in...
- Q What is the nuclear binding energy per nucleon of potassium-40?Particle Mass (amu) K-40 39.9632591 Neutron 1.008701 Proton1.007316 Electron 0.000549 (1 kg = 6.022 × 1026 amu; NA = 6.022 ×1023...
- Q A 100.0 ml sample of 1.00 M NaOH is mixed with 50.0 mlof 1.00 M H2SO4 in a large Styrofoam coffee cup; the cup is fittedwith a lid through which...
- Q A beaker with 1.30×102 mL of an acetic acid buffer witha pH of 5.000 is sitting on a benchtop. The total molarity of acidand conjugate base in this buffer is...
- Q What is the pH of 0.1 M FeSO4 please show all steps
- Q Use Hess's law and the measured mean enthalpy changes for theNaOH-HCl(36.2) and NH3-HCl(31.9) reactions to calculate theenthalpy change to be expected from the reaction: NaOH +NH4Cl----NaCl + NH3 +H2O
- Q The reaction                                   NO(g) + O3 -> NO2(g) +O2(g)was studied in 2 experiments under pseudo-first orderconditions.a) [O3] = 1x1014 molecules/cc inexcessthe [NO] varied as follows  {Note, time is inmsec (1 msec =...
- Q Imagine that you have a 7.00 L gas tank and a 3.00 L gas tank.You need to fill one tank with oxygen and the other with acetyleneto use in conjunction...
- Q Define Z-effective for: He, Mercury, Xenon, Argon and Neon ?Please explain
- Q Q1: If the theoretical yield of a reaction is 24.8 g and theactual yield is 18.5 g, what is percent yield?Q2: When 11.5 gram of C are allowed to react...
- Q For the following reactions please balance the equation andconvert to a net ionic equation (see above) and give the correctphysical state of each reactant and product in the net ionicequation...
- Q 1. Calculate the pH during the titration of 25.00 mL of 0.1000 MLiOH(aq) with 0.1000 M HI(aq) after 24.2 mL of the acid have beenadded.2. Calculate the pH during the...
- Q The Ksp of PbBr2 is 6.60*10^-6 M^3. What is the molar solubilityof PbBr2 in pure water?What is the molar solubility of PbBr2 in 0.500 M KBrsolution?What is the molar solubility...
- Q For each of the following unbalanced reactions, suppose 5.18 gof each reactant is taken. Determine which reactant is limiting,and also determine what mass of the excess reagent(s) will remainafter the...
- Q 1. Why is it important to know the difference between acids andbases, in terms of safety?2. Ionic bonds, covalent bonds and hydrogen bonds all help tohold chemical entities together. Distinguish...
- Q Find the pH during the titration of 20.00 mL of 0.2830M benzoic acid, C6H5COOH(Ka = 6.3 ✕ 10-5), with 0.2830M NaOH solution after the following additions oftitrant.(a)    0 mL(b)    10.00 mL(c)    15.00 mL(d)    19.00...
- Q Complete the following table by calculating the missing entriesand indicating whether the solution is acidic, basic or neutral.the pOH for one row is 9.75 and the H+ on the bottom...
- Q A dryer is operated with a material containing 10% H2O (by mass)to a final dried material containing 5% H2O (by mass). The freshair is mixed with recycled air and is...
- Q The concentration of grain alcohol(C2H5OH) in whisky is given in \"degreesproof\", which is twice the percent alcohol by volume (v/v). Whatare the mole fraction and molality of C2H5OHin 80.
- Q what the ph of 0.109 M hydrogen chromate ion (HCrO4^-)
- Q A mixture is made by combining 19.9 mL of 1.2×10−3 M KSCN, 8.5mL of 8.1×10−2 M Fe(NO3)3, and 11 mL of 0.198 M HNO3. Calculate theconcentration of Fe3+ in the...
- Q Problem: Two primary batteries are based on the cell reactionsas follows:2 MnO2 + Zn + 2NH4Cl ->Mn2O3 +Zn(NH3)2Cl2 + H2Oand2Li + 2SO2 ->Li2S2O4that have free energies of -229 Kj/mol of...
- Q Consider the following reaction: 2 A + 3 B2 ⇌ A2B6The initial concentrations of A and B2 are 0.245 M and 0.730 M,respectively, with no A2B6 initially present. When...
- Q Just answers.A. A buffer solution that is 0.431 M inHClO and 0.431 M inNaClO has a pH of 7.46.(1) The addition of 0.01 mol ofH3O+ to 1.0 L of this...
- Q Oneway of achieving an IPSP is to increase permeability toCl-. By what other mechanism can you achieve an IPSP(change permeability to what ion)? Explain why.PLEASE answer this questionCOMPLETELY and I'll...
- Q how do each of the following affect the calculated volume ofhydrogen gas at stp?A: The strip of magnesium used in the experiment was partlyoxidized and it was not cleaned before...
- Q what would happen to the values you calculated for kc in theexperiment if the beer's law constant (k) value you used washigh (e.g.you used 6000 M^-1 when the actualconstant had...
- Q A 75.0-mL sample of 0.0500 M HCN (Ka = 6.2e-10) is titrated with0.212 M NaOH. What is the [H+] on the solution after 3.0 mL of0.212 M NaOH have been...
- Q chem lab: Solvent Free Wittig Reaction LabWittig reaction= reaction of a phosphonium ylide with an adehydeor ketone to make a new alkeneA.) Another isomer of the product is formed to...
- Q You are asked to prepare a buffer solution ofH2PO4-/HPO42-with a pH of 6.68. A 153.00 mL solution already contains 0.126 MHPO42-.Hint: you will need to look up the proper Ka...
- Q 1. The degree to which a weak base dissociates is givenby the base-ionization constant, Kb. For thegeneric weak base, B B(aq)+H2O(l)⇌BH+(aq)+OH−(aq) this constant isgiven by Kb=[BH+][OH−][B] Strong bases will have...
- Q a. normal boiling point of a solution made from 18.02 g glucosedissolved in 1.250 kg of water b. normal freezing point of asolution made from 180.2 g glucose dissolved in...
- Q A solution of the sugar mannitol (mol wt 182.2) is prepared byadding 54.66g of mannitol to 1000g of water. The vapor pressure ofpure liquid water is 2338 Pa at 200C....
- Q A---Write a net ionic equation to show that ethylamine,C2H5NH2, behaves as aBronsted-Lowry base in water.-----Write a net ionic equation to show that codeine,C18H21O3N, behaves as aBronsted-Lowry base in water.-----Write a...
- Q A solution of the sugar mannitol (mol wt 182.2) is prepared byadding 54.66g of mannitol to 1000g of water. The vapor pressure ofpure liquid water is 2338 Pa at 200C....
- Q Which of the following represent a valid set of quantumnumbers?n = 1, l = 0, ml = -1, ms = +1/2n = 3, l = 2, ml = -2, ms...
- Q Draw the reaction mechanism that shows BH3 adding to the alkene.Why do we get the anti-Markovnikov product?
- Q How do heat treatments affect the hardness and impact properties(microstructure)?
- Q Show that in a cubic crystal [HKL] direction is alwaysperpendicular to a plane whose Miller indices are (HKL). Show thegeneral proof and not example of specific plane and direction.
- Q Using Stoichiometry,calculate the mole quantity of hydrogen gasproduced for each data point in Part A and Part B of thisexperiment using your data. Identify the concentration of HCl (partA) or...
- Q 1. Show the reaction, along with the transition state (‡),between 2-methyl-2-pentene and BH3 in THF. Then, show thesubsequent reaction of the organoborane intermediate with H2O2 andOH-1. Explain why hydroboration is...
- Q Given:AgBr(s) <--> Ag+(aq) + Br-(aq)andAg+(aq) + 2NH3(aq) <-->Ag(NH3)2+(aq)a) What would be the value of K for AgBr(s) +2NH3(aq) <-->Ag(NH3)2+(aq) + Br-(aq) ?b) What would be the molar solubility of silver...
- Q A gas has a volume of 4.70 L at 0 ∘C. What final temperature, indegrees Celsius, is needed to change the volume of the gas to eachof the following, if...
- Q How do you read infrared spectrometry graphs and determine thetypes of bonds that are shown at each peak? Also, how would youread a graph and determine which compound is being...
- Q A 0.1276−g sample of a monoprotic acid (molar mass = 1.10 × 102g/mol) was dissolved in 25.0 mL of water and titrated with 0.0633 MNaOH. After 10.0 mL of base...
- Q Suppose 3 large tankers containing liquefied natural gas (LNG)leave a gas export terminal every day. The methane is stored inliquid form in the tankers, at -260°F, in a volume 600...
- Q A mixture if Krypton and Neon gases, at a total pressure of 678mmHg, contains 5.96 grams of krypton and 4.42 grams of neon what isthe partial pressure of each gas...
- Q Calculate the pH change when 5.0 mL of 5.0-M NaOH is added to0.500 L of a solution of:(The pKa for acetic acid is 4.74.)a) 0.50-M acetic acid and 0.50-Msodium acetate.pH...
- Q 1. After glycogen reserves are depleted what are the majorgluconeogenic precursors of glucose under the conditions ofA. starvationB. intense exercise
- Q Which of the following will increase the number of theoreticalplates in a chromatographic separation? Select all that areappropriate.decrease column packing particle sizeincrease column mobile phase flow rateincrease column lengthchange mobile...
- Q Consider the titration of a 26.0-mL sample of 0.175 M CH3NH2with 0.155 M HBr. (The value of Kb for CH3NH2 is 4.4×10−4.)A. Determine the initial pH.B. Determine the pH at...
- Q Sorbose, C6H12O6, is a carbohydrate used in the manufacture ofvitamin C. A lab supervisor at Vital C Pharmaceuticals, Inc.suspected that an employee had sabotaged the production line bysubstituting xylitol, C5H12O5,...
- Q Three flasks, labeled A, B, and C, contained aqueous solutionsof the same pH. It was known that one of the solutions was 1.0 ×10–3 M in nitric acid, one was...
- Q What is the demographic transition? What are the four stages of thedemographic transition?
- Q Why is Vmax not a constant? Why do we want to analyze kcatinstead of Vmax?
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