Chemistry question and answers for July 23, 2023
- Q Calculate the concentration of all species in a 0.150 M solutionof H2CO3. H2CO3], [HCO−3], [CO2−3], [H3O+], [OH−] = Enter youranswers numerically separated by commas. Express your answer usingtwo significant figures.
- Q A) A 29.0 mL sample of 0.274 Mmethylamine,CH3NH2, is titrated with0.238 M hydroiodic acid.The pH before the addition of any hydroiodic acidis ______.B) A 24.5 mL sample of 0.220 Methylamine,C2H5NH2,...
- Q At –80°C, K for the reaction N2O4(g) 2NO2(g) is 4.66 × 10–8. Weintroduce 0.049 mole of N2O4 into a 1.0-L vessel at –80°C and letequilibrium be established. The total pressure...
- Q Part ACalculate the molar solubility of Ni(OH)2 when buffered atpH=8.0.Express your answer using one significant figure.Part BCalculate the molar solubility of Ni(OH)2 when buffered at pH =10.3.Express your answer using...
- Q Explain precipitate hardening clearly ? Feel free to usea binary phase diagram to illustrate how it is accomplished.Explain how precipitate hardening makes a material stronger andharder ? There are two...
- Q A mixture containing 15.0 mol% hexane balance N2 flows through apipe at 6.53 kmol/h. The pressure is 2.00 atm (abs) and thetemperature is 100°C. If I want to begin to...
- Q The questions below refer to the following system: Co(H2O)6 2+ +4 Cl– CoCl4 2– + 6H2O pink blueWhen cobalt(II) chloride is added to pure water, the Co2+ ionshydrate.The hydrated form...
- Q In the first 12.0 s of the reaction, 1.6×10−2 mol of O2 isproduced in a reaction vessel with a volume of 0.340 L . What isthe average rate of the...
- Q In the first 12.0 s of the reaction, 1.6×10−2 mol of O2 isproduced in a reaction vessel with a volume of 0.340 L . What isthe average rate of the...
- Q 1. You work for a crafts supply company, KidKrafts, makingcalcium carbonate for their chalk products. They have recentlydecided to add plaster of Paris as one of their products. The keyingredient...
- Q an unfortunate effect of drinking too much alcohol, known as ahangover, is attributable to the acetaldehyde formed when ethanolis oxidized. there is some evidence that vitamin b1 can cure ahangover....
- Q  1.A sample of nitrogen at 20.0 °C has a volume of 954 mL at a pressure of 1,101 mmHg. To change the volume to 1,496 mL, what must be the...
- Q Show that the following are eigenfunctions of the Laplacianoperator and determine the eigenvalues: a. (r^-1)sinkrb.( r^-3)[(sin^2)θ]sin2φ
- Q What is the final pH at 25°C when 56 mL of 0.139 mol/L NaOH(aq)and 30 mL of 0.187 mol/L HA(aq) are mixed. Assume that HA is a weakmonoprotic acid with...
- Q Materials:Reaction Buffer 0.5 M Tris HCl pH 8.0 with 5 mM MgCl2Alkaline phosphatase: 500 μg/mL stock solution in the bufferabove. Keep enzyme on ice!p-nitrophenyl phosphate: 1000 μM and 10000 μM...
- Q The average human body contains 5.50 L of blood with a Fe2+concentration of 2.20×10−5 M . If a person ingests 9.00 mL of 21.0mM NaCN, what percentage of iron(II) in...
- Q P23-27: Molar absorptivity data for the cobalt andnickel complexes with 2,3-quinoxalinedithiol are εCo = 36,400 and εNi = 5520 at 510 nm andεCo = 1240 and εNi = 17,500 at...
- Q Preparation of Ammine Complexes of Cobalt(III)1) Give at least two differences between the two preparationsthat are carried out in this lab.2) Base on the structures of complex ions shown in...
- Q A) Calculate the concentration ofall species in a 0.490 M solution of H2SO3.B) Calculate the concentration of all species in a 0.165M solution of H2CO3.
- Q Part BWhat is the pH after 0.150 mol of HCl is added to the bufferfrom Part A? Assume no volume change on the addition of theacid.Express the pH numerically to...
- Q A single charcoal briquette has a mass of 0.1 kg, and is made upof almost entirely carbon. I want to burn that briquette in air ina sealed oven. When the...
- Q This is for my biochemistry lab, the experiment is dealing withtrypsin and BPTI. I need to make a graph: plot the absorbancechange per minute versus the BPTI concentration for eachcuvette.here...
- Q Calculate the pH for each of the following cases in thetitration of 25.0 mL of 0.230A pyridine, C5H5N(aq) with 0.230MHBr(aq):a.) before addition of any HBrb.) after addition of 12.5 mL...
- Q Lead(II)chromate, PbCrO4,was used as a yellow paint pigment (“chrome yellowâ€). When asolution is prepared that is 5.0 × 10–4M in lead ion,Pb2+,and 5.0 × 10–5M in chromateion, CrO42–,would you expect...
- Q To 1.0 L of water, 2.8 × 10–6 mol ofPb(NO3)2, 6.6 × 10–5 mol ofK2CrO4, and 1.0 mol of NaCl are added. Whatwill happen?SaltKspPbCrO41.8× 10–14PbCl21.6× 10–5A.No precipitate will form.B.A precipitate...
- Q 3. (a) What is SDS (sodium dodecylsulfate)? Draw thestructure(b) How would you separate a mixture of polypeptides accordingto their lengths using SDS –polyacrylamide gel electrophoresis? Describe in a fewsentences.
- Q Explain what “k†means, and how it can be calculated for theiodine clock reaction. As part of your explanation, include asample calculation. Explain in one well-developed paragraph.
- Q Calculate the pH for 0.15M KCL, 0.15M Na2HPO4, and 0.15M NH4Cl.I need to use ICE tables to find the pH for these, but I am havingtrouble making them work.
- Q A 0.268 mol sample of PCl5(g) is injected into an empty 4.05 Lreaction vessel held at 250 °C. Calculate the concentrations ofPCl5(g) and PCl3(g) at equilibrium. 1.80 @ 250 C
- Q 50mL of 0.1M weak acid is titrated with 0.1 strong acid. Pka is5.20What is the pH before the acid is addedpH after adding 10mL of acidpH after 50 mL is...
- Q Part AIt takes 55.0 J to raise the temperature of an 10.2 g piece ofunknown metal from 13.0∘C to 25.0 ∘C. What is the specific heat forthe metal?Part BThe molar...
- Q determine the pH of each two component solutiona.) 0.550 M HI and 0.850 M HFb.) 0.112 M NaCl and 0.953 M HFc.) 0.050 M KOH and 0.015 M Ba(OH)2d.) 0.088...
- Q How could you separate a mixture of starch, naproxen,and acetaminophen? Describe the laboratory procedure you woulduse.
- Q How many configurational isomers are possible for the followingcompounds?A. 4-chloro-3-hexen-2-olB. 2,4-hexadieneC. 3-chloro-1,4-pentadiene
- Q 1) 362.11 g of O2 are contained in a 3.00 L high pressure tankat a temperature of 186°C. What is the pressure of the gas intorr?2) A gas has a...
- Q Explain how symmetry arguments are used to construct molecularorbitals.
- Q At 700 K, CCl4 decomposes to carbon and chlorine. The Kp valuefor the decomposition is 0.76. Find the starting pressure of CCl4at this temperature that produces a total pressure of...
- Q How many total atoms are in 0.850 g ofP2O5?
- Q Explain the role of allostery in glycogene phosphorylase in theactivation of PP1 in liver cells.
- Q Consider the combustion reaction between 26.0mL of liquidmethanol (density = 0.850 g/mL) and 13.0L of oxygen gas measured atSTP. The products of the reaction are CO2 (g) and H20 (g).Calculate...
- Q 8.00g of CH4 is allowed to burn in the presence of 6.00g ofoxygen. How much (IN GRAMS) CH4, O2, CO2, and H2O remain after thereaction is complete?
- Q The following is a precipitation reaction: 2 K3PO4 (aq) + 3Co(NO3)2 (aq) → Co3(PO4)2 (s) + 6 KNO3 (aq) What volume of 0.222 MK3PO4 (aq) in milliliters is needed to...
- Q Question 260.4 ptsArrange the following elements, Se, Ca, Ar, Cs, Ge in order ofincreasing first ionization energy, (IE1).  Cs < Ca <S e< Ge < ArCs < Ca < Ge <...
- Q River water between Back Falls and Angel Falls contains 0.0769mg Al3+ per L and has a pH of 8.20. Total carbonates are 0.005 molL-1 .(a) [5 marks] Calculate the concentrations...
- Q For two reversible competing one-step reactions, A-Y and A-Z,how does the Y/Z ratio change with a) reaction temperature, b)reaction time if Y is the kinetic product and Z is thethermodynamic...
- Q what is the theory behind acid-base separations (i.e. how doesit work and how can it be used to purify an impure organiccompound)?
- Q In the lab: extraction, purification and analysis of turmericnatural products, Calculate the amount of 3M HCI that wouldbe needed to neutralize the 35 mL of 1M NaOH used in theextractions...
- Q The Kefauver Amendments of 1962 to the Food Drug and CosmeticAct added requirements except:a. All drugs must be safe and effective, including all drugsapproved by FDA since 1938b. Drug manufacturers...
- Q write the balanced complete ionic and net ionic equations forK2SO4(aq)+BaCl2(aq)-->KCl(aq)+BaSO4(s),Al(NO3)3(aq)+NaOH(aq)-->Al(OH)3(s)+NaNO3(aq),CaCl2(aq)_Na2CO3(aq)-->NaCl(aq)+CaCO3(sNa2S(aq)+Pb(C2H3O2)2(aq)-->PbS(s)+NaC2H3O2(aq)
- Q what are the names and structures of the major organic compoundsanticipated to be obtained in the sequiterpene component of theturmeric extract?
- Q Which amino acidand artificialsweetener areverydangerous to somepeople? Why?(Hint: Name and describethe disorder, it symptomology, andmaintenance)
- Q I need name of the final compound, and step by step equations ofthe reaction for the experiment below. Ethylenediamine complexes ofCobalt Procedure 1. Dissolved 1.5 g CoCl2 in 5mL water...
- Q A mineral contains 11.11% Ni (58.71 g/mol); 0.300 g of the sameis treated and its ammoniacal solution is treated with 50.00 mL ofa solution of 0.0911 M KCN. A little...
- Q Hi, i'm working on lab report on iodometric determination of Cuin Brass and can someone please explain in WORDSon how the analyte (copper) reaction with iodide works? thanks2Cu2+ + excess...
- Q There is a total of 6 trials for an experiment involving themeasurement of standard enthalpies (kcal/mol).a) If additional data points are taken but the standarddeviation and mean remain unchanged, what...
- Q Suppose that a student collects the following spectrophotometricdata to determine the relative concentrations of HMR and MR insolution: The abosorbance at 425 nm was measured to be 0.170 and at520...
- Q 1) Pyridine is a weak base that is used in the manufacture ofpesticides and plastic resins. It is also a component of cigarettesmoke. Pyridine ionizes in water as follows: C5H5N+H2O⇌C5H5NH++OH−The...
- Q The final volume of buffer solution must be 100.00 mL and thefinal concentration of the weak acid must be 0.100 M.Based on this information, what mass of solid conjugate baseshould...
- Q Explain the differences between gel electrophoresis and columnchromatography. Address the principles behind each separation. Whydo large molecules migrate more easily in one method and with moredifficulty in the other? Which...
- Q Amass of 14.22g of (NH4)2SO4 (molar mass = 132.06g/mol) is dissolvedin water. After the solution is heated, 30.19g of Al2(SO4)3•18H2O(molar mass = 666.36g/mol) is added. calculate the theoreticalyield of the...
- Q . The four substances HCl, I2, HI, and Cl2, are mixed in areaction vessel and allowed to reach equilibrium in the reaction: 2HCl (g) + I2 (s) ⇌ 2 HI...
- Q Question: Explain whether the technique errors will result inhigh or low experimental determination of the molar concentrationof CH3COOH in vinegar. 1. A student uses the pipet bulb to blow thelast...
- Q What is the coefficient of H+(aq) after balancing the followingequation? Bi3+(aq) + Fe3+(aq) + H2O => BiO31- + Fe2+ +H+(aq)
- Q Ammonia is produced by the catalytic reaction of nitrogen andhydrogen.A)Â Â Write the chemical reaction and balance it.Determine the stoichiometric coefficients.B) Â Â If 15 mol/sec of H2 is fed to thereactor,...
- Q Describe and explain observed conductivity changes during thetitration of your amino acid. Which parameter is more helpful inlocating the first and the second equivalence points, the pH or theelectrical conductivity?...
- Q A.) 0.85 g of hydrogen chloride (HCl) is dissolved in water tomake 8.0 L of solution. What is the pH of the resultinghydrochloric acid solution?B.) 0.50 g of sodium hydroxide...
- Q Sodium carbonate (2.4134 g) is dissolved in enough deionizedwater to give a solution with a total volume of 250.0 mL. What isthe pH of the resulting solution? Hint: For carbonic...
- Q Suppose a soap manufacturer starts with a triglyceride that hasthe fatty acid chains arachidonic acid, palmitoleic acid andlinoleic acid attached to the three backbone carbons. Themanufacturer saponifies the triglyceride with...
- Q Discuss what influence temperature has on molecular motions andhow it would impact the reaction in Part II.Part II. Temperature Dependence in a Complex IonEquilibriumMetal ions such as Co2+ will form...
- Q How many photons are produced in a laser pulse of 0.616 J at 529nm?
- Q Develop a procedure to determine the ideal gas law constant Rfrom:NaHCO3 (s) + CH3COOH (aq)--> NaCH3COO (aq) + CO2(g) + H20(l)so that different amounts of CO2 will be produced and...
- Q Determine the catalyst activity of trypsin.
- Q Carbon disulfide is prepared by heating sulfur and charcoal. Thechemical equation isS2(g) + C(s) <---> CS2(g)How many grams of CS2(g) can be prepared by heating 21.0 molesof S2(g) with excess...
- Q Use the thermodynamic arguement to explain why the perfectlyfolded protein is only marginally stable compared to its unfoldedform.Use the same equation to explain why higher temperaturesdenature proteins.Which of the weak...
- Q Calculate the pH for each of the following cases in thetitration of 50.0 mL of 0.140 M HClO(aq) with 0.140 M KOH(aq). Theionization constant for HClO is 4.0x10^-8. (a) before...
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!