Chemistry question and answers for August 04, 2023
- Q Hydrogen and chlorine gas are placed in a 10.0 L container andallowed to react. The initial density of the mixture is 5.01 x10-3gm/ml. The vessel is at 300K and the...
- Q Fill in the blanks using (fatty acids, glycerol, sphingolipids,steriods, glycolipids, glycerophospholipid, triacylglycerols.)Compounds that contain a fused ring system are called__________. These have three 6-membered rings and one 5-memberedring. Some of...
- Q Find the pH of a 0.14M CH3COOH solution. Ka= 1.8x 10^-5
- Q compare the values of the enthalpy of neutralization for thethree acids( H3CCOH, Na2S2O3, HCl). explain any similarities and/ordifferences
- Q To prepare a buffer properly, it is essential to understand howa buffer is described. Here are four buffers used:1. A solution that is 0.1 M HC2H3O2 and 0.10 M NaC2H3O22....
- Q In paper chromtography, what is the nature of the attractionsbetween the stationary phase (cellulose) and the moving phase(hydrochloric acid/water/acetone) and the species ( Zn2+, Co2+,Cu2+, Cd2+ , Fe3+, and Ni2+...
- Q Write net ionic equations for the reactions that take place whenaqueous solutions of the following substances are mixed.A) sodium cyanide and nitric acidB) ammonium chloride and sodium hydroxideC) sodium cyanide...
- Q Determine the number of translational, rotational andvibrational degrees of freedom of HCl, CO2, H2O, NH3, and CH4.
- Q Derive an equilibrium relationship (y = f (x)) withrelative volatility in the ideal solution
- Q A solution is 0.020 M in each Ca2+ andCd2+. Adjusting the pH of the solution to which of thefollowing values would achieve the best separation by precipitationof the hydroxides? solubility...
- Q Kb\"weak base calculations\"1. The hydronium ion concentration of an aqueous solution of0.538 M ammonia isH3O+ _______ MKb WEAK BASE CALCULATIONS2. The pOH of an aqueous solution of 0.408 M isoquinoline(aweak...
- Q Rank the following photons in terms of increasing energy. (Usethe drop down options, and choose '1' for the lowest photon energy,'2' for the next lowest, etc.) Yellow (λ = 590...
- Q Calculate the expected ph of the following solutions. Pleaseshow all of your work and explain your steps, if you can.Solution 1: 50mL 0.10M NH3 + 50mL 0.10M NH4NO3Solution 2: 10mL...
- Q Based on your copper solid used in RXN 1, how many grams ofcopper product should have been formed? Based on the copper solidin RXN 1, how many grams of the...
- Q The acid ionization constant for Ga(H2O)63+ (aq) is 2.5×10-3 .Calculate the pH of a 0.1500 M solution of Ga(NO3)3 .
- Q Which of the following statements is false?Electron affinity is a measure of the energy evolved when agaseous atom gains an electronAnions are smaller than the parent atoms from which they...
- Q This is for the lab practical I take on Tuesday night. If youcould answer each one and show your work/ explain that'd be amazingso I can do well on the...
- Q A 7.95-atm PCl5 is initially placed in an emptyvessel at 25ËšC. Calculate Kp if the equilibrium partialpressure of Cl2 is 3.00 atm at the same temperature.I am completely lost on...
- Q A 3.0% by mass aqueous solution of hydrogen peroxide (H2O2) canbe purchased at a pharmacy; by contrast, chemistry departments canpurchase 30.0% by mass aqueous solution of hydrogen peroxide havinga density...
- Q A reactionA(aq) + B(aq) --> C(aq)has a standard free-energy change of –3.23 kJ/mol at 25 °C. Whatare the concentrations of A, B, and C at equilibrium if, at thebeginning of...
- Q pMice that are completely lacking the Adenine nucleotidetranslocase gene (Ant-/-) are viable (which is surprising) and showthe following physiological phenotypes:nHighlevels of alanine, lactate and succinate (inserum).nAsix-fold increase of mitochondrial hydrogenperoxide...
- Q Please Give All 3 answer.Q1) A student was given a sample of crude salicylic acid torecrystallize. The initial mass of the crude acid was 131 mg. Themass after recrystallization was...
- Q Acid HX is a weak acid with Ka=1.0x10-6. A50.0 mL sample of 1.00 M HX(aq) is titrated with 1.00 M NaOH(aq).What is the pH of the solution at the points...
- Q Do you predict that maltose will reduce cupric ion inFehling
- Q Calculate the equilibrium concentration of undissociated in aglycolic acid solution with an analytical glycolic acidconcentration of 0.0824 and a pH of 3.180.
- Q For the reactions shown below, we added 2.25 mL of 0.0450M HCl to a test tube containing one of the two cations(Ag+ or Pb2+) and recovered 0.0141 g ofprecipitate.AgNO3(aq) +...
- Q QUESTION 1Calculate the mass of SO3 formed when 9.42 g ofSO2 reacts with 4.50 g of O2 according to thefollowing reaction.                      2SO2+ O2 → 2SO3a.22.52 gb.11.77 gc.11.25 gd.34.27 ge.5.63 gQUESTION 2If...
- Q Calculate the pH during titration of 25 mL of 0.175 M HCN with0.3 M NaOH after the addition of 0 mL, 7.29mL, 14.5833 mL, and 20mL base. Show all work.
- Q Chlorine can be prepared in the laboratory by the reaction ofmanganese dioxide with hydrochloric acid, HCl(aq), as described bythe chemical equation: MnO2(s) + 4HCl --> MnCl2 (aq) + 2H2O (l)+...
- Q Calculate the concentrations of all species in a 0.540 M Na2SO3(sodium sulfite) solution. The ionization constants for sulfurousacid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8.
- Q Molar solubility of copper hydroxide in pure water, taken intoaccount that water is adding hydroxide into the solution.Ksp=[Cu^2+][OH^-]^2 = 4.8x10^-20(x) (1.0x10^-7 +2x)^2 = 4.8x10^-20
- Q for the titration of 10.0 ml of .15 M HNO2 aqueous solution(Ka=7.2x10^-4) using 2.5 M NaOH aqueous solution, consider thefollowing points of the titration: A: Initial pH of .15 M...
- Q A 67.2 g sample of a gold and palladium alloy contains 2.85×1023atoms . What is the mass percentage of the gold and palladium?
- Q Calculate the nuclear binding energy in mega-electronvolts (MeV)per nucleon for 179Hf if its nuclear mass is 178.946 amu.
- Q For the reactions shown below, we added 3.75 mL of 0.0450M Na2S to a test tube containing one of the twocations (Cu2+ or Cd2+) and recovered 0.0161 gof precipitate.Cu(NO3)2(aq) +Na2S(aq)...
- Q Part AA 3.00-L flask is filled with gaseous ammonia, NH3. The gaspressure measured at 25.0 ∘C is 2.05 atm . Assuming ideal gasbehavior, how many grams of ammonia are in...
- Q 1. Why is that during alpha emission, the atomic numberdecreases by two, and the mass number decreases by four? In youranswer yu should consider what alpha particle is?2. In beta...
- Q The enthalpy change under standard conditions for which of thereactions below would be equal to the ∆H°f of NaOH(s)? (A) Na(s) +H2O(l)  NaOH(s) + 1/2 H2(g) (B) Na(s) +...
- Q Ineed a 2 page essay: so what is the Cons of pollution and what canpeople with big busniess do to help control the pollution and helpour environment? Please
- Q What is the limiting reagent in esterification using isopentylalcohol and acetyl chloride to make isopentyl acetate? Prove youranswer with limiting reagent calculations.Used 200 uL of isopentyl alcohol, 800 uL of...
- Q Given a DNA molecule with 10,000bp, in theory how many times the“GTCCGGAC†sequence is expected? And how about “ATWAT†sequence?(Where W= A or T)
- Q Discuss the thermodynamic driving force of micelles and bilayermembranes.
- Q When light of wavelength equal to 364 nm strikes a metal, thekinetic energy of the ejected electron is 4.12 × 10-19 J. What isthe work function of the metal?
- Q Given the provided enthalpies of formation, calculate ΔH for thereaction shown.2 H2 (g) + O2 (g) → 2 H2O(g)            ΔH = -483.6 kJ3 O2 (g) → 2 O3(g)                             ΔH = +285.4 kJ6...
- Q You have the following solutions at your disposal to prepare abuffer solution with a pH greater than 7.0:(1) 50.0 mL of 0.35 M NH3 Kb = 1.8×10-5  (2) 55.0 mLof 0.35...
- Q I compress an ideal gas under aconstant pressure of 3.2 × 105 Pa from 6.31 mL to 5.12mL.i. What is the work done in this process?ii. If this is an...
- Q Elemental S reacts with O2 to form SO3 according to thereaction2S+3O2→2SO3A) How many O2 molecules are needed to react with 4.13 g ofS?Express your answer numerically in units of molecules.B)...
- Q The reactionZn(NO3)2 + 4NaOH --->Zn(OH)42- + 2NO-3 +4Na+If 25 mL of a 0.10 M Zn(NO3)2 is added to10.0 mL of 0.65 M NaOH and at equilibrium the concentrationof  Zn(OH)42- is found...
- Q A beaker with 125 mL of an acetic acid buffer with a pH of 5.000is sitting on a benchtop. The total molarity of acid and conjugatebase in this buffer is...
- Q When 25.00 mL of unknown were passed through a Jones reductor,molybdate ion (MoO42-) was converted intoMo3+. The filtrate required 16.43 mL of 0.01033M KMnO4 to reach the purple end point.MnO4-...
- Q iron nail and copper (II) sulfate the compound contains Fe2+molecular equationionic equationnet ionic equationspectator ions
- Q 3Mg +2AlCl3 -------> 2Al +3MgCl2a)calculate the mass of aluminium chloride that will react with 40gof magnesium.b) calculate the mass of each product formed from thereaction of 40g of mg2)when propane...
- Q A 2.700
- Q current event or recent research related to atoms,atomicstructure or chemical bonds.
- Q A mixture of methane (CH4) and ethane (C2H6) is stored in acontainer at 294 mm Hg. The gases are burned in air to form CO2 andH2O. If the pressure of...
- Q 1. A soil has the following cations reported as cmolc per kg ofsoil Ca = 6; Mg = 4; K = 3; Na = 2; Al3+ = 10.a. Calculate the...
- Q The hydrolysis of 1-chloro-1-methyl cylcoheptane in 80% ethanolfollows a first order rate equation. The values of the specificreaction rate constants are:temp/C0253545k/s-11.06x10-53.19x10-49.86x10-42.92x10-31. Plot Ln(k) against 1/T2. Calculate the activation energy3. Calculate...
- Q 1.00 mol of A and 1.00 mol of B are placed in a 4.00-Lcontainer. After equilibrium is established, 0.400 mol of D ispresent in the container. Calculate the equilibrium constant...
- Q An aqueous solution of formic acid, HCOOH, is prepared at 0.075M. The acid-ionization constant is Ka= 1.8 x 10-4. Because this is a weak acid, you maypresume that the ionic...
- Q 8C How many liters of a 3.14 M K2SO4solution are needed to provide 81.3Â Â g of K2SO4 (molarmass 174.01 g/mol)? Recall that M isequivalent to mol/L.Expresss your answer to three significant...
- Q N, N'-Dimethylformamide (DMF) is a commonly-used polar solvent.Its normal boiling point is 426K and is has ΔH°vap =47.6 kJ/mol. Suppose a laboratory vacuum system is able to maintaina flask at...
- Q Discuss the relationship between a gas chromatogram and massspectrometry data. How do they correspond to identify the compoundspresent?
- Q 1. Retention time (tR) is a measure of how long a compound isretained on a stationaryphase in column in column chromatography.In TLC, Rf was a measure of how long thecompound...
- Q Question:1You dissolve 312 mg of a compound(AwBxCyDz) in waterproducing 14.31 mL of solution and use the photometer and standardsolutions to find that the concentration of the A is 1.24 x10-2...
- Q Write a balanced net ionic equation for the reaction ofmanganese(II) hydroxide, Mn(OH)2, with hydrochloricacid.Mn(OH)2(s) + 2H+(aq)---> Mn2+(aq) +2H2O(l)Mn(OH)2(s) + 2H+(aq)---> MnH2(s) +2OH−(aq)(OH)3(aq) + 3H+(aq)---> 3H2O(l)3OH−(aq) + 3H+(aq)---> 3H2O(l)Mn2+(aq) + 2Cl−(aq)--->...
- Q CCl F is considered to be environmentally safe and is used as arefrigerant. The heat of vaporization of CCl F is 289 J/g. Whatmass of this substance must evaporate in...
- Q Carbonic acid (H2CO3) is a weak diprotic acid withKa1=4.43×10−7 and Ka2=4.73×10−11. When sodiumbicarbonate (NaHCO3) is titrated with hydrochloric acid (HCl), itacts as a weak base according to the equationNaHCO3(aq)+HCl(aq)→H2CO3(aq)+NaCl(aq)Suitable indicators...
- Q A 0.4775 g sample of pewter, containing tin, lead, copper, andzinc, was dissolved in acid. Tin was precipitated as SnO2·4H2O andremoved by filtration. The resulting filtrate and washings werediluted to...
- Q The next 7 questions are related to the titration of 60.0 mL ofa 0.0250 M Zn2+ solution with 0.0600 M EDTA in a solution bufferedat pH 11. Assume that the...
- Q A 1.0 M solution of a compound with 2 ionizable groups (pKa's =6.2 and 9.5; 100 mL total) has a pH of 6.8. What are theconcentrations of the relevant acid...
- Q Solid carbon can react with gaseous water to form carbonmonoxide gas and hydrogen gas. The equilibrium constant for thereaction at 700.0 K is Kp=1.60×10−3.. If a 1.55-L reaction vessel initially...
- Q Carboxylic Acids. Lipids are a macromolecule we need to surviveand many of them happen to contain carboxylic acids. Choose onelipid - could be a particular steroid, fatty acid, or tri-glycerideand...
- Q Container A holds 732 mL of ideal gas at 2.30 atm. Container Bholds 114 mL of ideal gas at 4.30 atm. If the gases are allowed tomix together, what is...
- Q Give the empirical formula of each of the following compounds ifa sample contains the following quantities of each element. (Typeyour answer using the format CO2 for CO2.)(a) 0.0455 mol C,...
- Q The Lennard-Jones potential energy, U(x), is a function of \"x\"the distance between a pair of molecules. It is frequently calledthe van der Walls potential between molecules for dipole-dipoleinteractions. The potential...
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