Chemistry question and answers for September 03, 2023
- Q how is PLA synthesized
- Q Lab was done on bromination of acetanilide, aniline,anisole.One of three compound was dissolved in glacial acetic acid.Bromine/hydrobromic acid mixture was added and continue to stir for20minutes (for anisole heat the...
- Q A sample of solid Ca(OH)2 was stirred in water at a certaintemperature until the solution contained as much dissolved Ca(OH)2as it could hold. A 77.3-mL sample of this solution was...
- Q Which of these is NOT a true statement? (Why isthe answer B?)a. All Lewis bases are also Brønsted-Lowry bases.b. All Lewis acids contain hydrogen.c. All Brønsted-Lowry acids contain hydrogen.e. All...
- Q Use molecular orbital theory to explain why the bond energy ofan O2 molecule is less than that of aO2+ ion.
- Q Chapter 7 is about Acids and Bases and Chapter 8 is aboutOxidation Reduction. Write on one topic Antacids or Batteries.Choose 4 products, check the labels, list the active ingredients,and discuss...
- Q What are the physical and chemical properties of the spicecumin?
- Q Rewrite the procedure in third person & in past tense:ProcedureYou will be provided with post-mitochondrial supernatantfractions from rat liver of control rats and phenobarbitone-treatedrats. Carry out the assay for drug...
- Q A sample of gas weighs 4.406g and has a volume of 1100.00 mL at665.0 torr and 37.0 degrees C. What is the molar mass? Please showwork.
- Q A. What was the ?H value obtained for NH3 + HCl
- Q 1.00 mL of a 2.95 X10-4 M solution of oleic acid isdiluted wth 9.00 mL of petroleum ether, forming solution A. Then2.00 mL of solution A is diluted with 8.00...
- Q Learning Group Problem Chp 9, problem 1.1. Given the following information, elucidate thestructures of compounds A and B. Both compounds are soluble indilute aqueous HCl, and both have the same...
- Q The combustion of 0.4196 g of hydrocarbon releases 17.55 kJ ofheat. The masses of the products are 1.418 g of carbon dioxide(CO2) and 0.290 g of water (H2O). Thestandard formation...
- Q Ethylene oxide is produced by the catalytic oxidation ofethylene:C2H4(g)+12 O2(g)→C2H4O(g)An undesired competing reaction is the combustion of ethylene toCO2.The feed to a reactor contains 2 molC2H4/mol O2. The conversion andyield...
- Q You find an old bottle of aspirin whose shelf life is expired.Assuming you have a bad headache, you have no other access to freshaspirin, and you have a strong stomach...
- Q Write chemical equations for the five reactions described:The first reaction involves the oxidation of copper with nitricacid, resulting in a blue-green colored copper (II) nitrate,Cu(NO3)2, solution.The second reaction involves adding...
- Q A student designs an ammeter (a device that measures electricalcurrent) that is based on the electrolysis of water into hydrogenand oxygen gases. When electrical current of unknown magnitude isrun through...
- Q What is involved in a multistep synthesis? What are somechallenges and opportunities?
- Q A pure, low molecular weight hydrocarbon gas is burnt in afurnace giving a flue gas containing10.8% CO 2 , 3.8% O 2 and the remainder nitrogen. Calculate theatomic ratio, H/C,...
- Q Calculate [H3O + ] for a 2.5 x 10-4 M solution of weak acid (Ka= 5.3 x 10-4 )A.1.4 x 10-4 MB.2.1 x 10-4 MC.6.2 x 10-4 MD.7.3 x 10-4...
- Q At equilibrium, the concentrations in this system were found tobe [N2]=[O2]=0.200 M[N2]=[O2]=0.200 M and [NO]=0.400 M.[NO]=0.400M.N2(g)+O2(g)−⇀↽−2NO(g)N2(g)+O2(g)↽−−⇀2NO(g)If more NONO is added, bringing its concentration to 0.700M,0.700 M, what will the final...
- Q A mixture of oxygen andnitrogen gases is maintained in a7.17 L flask at a pressure of1.53 atm and a temperature of41°C. If the gas mixture contains8.88 grams of oxygen, the...
- Q Gaseous ethane CH3CH3 reacts with gaseous oxygen gas O2 toproduce gaseous carbon dioxide CO2 and gaseous water H2O. If 2.19gof carbon dioxide is produced from the reaction of 2.7g of...
- Q explain how a QIAprep spin miniprep purification column (( withsilica gel functional group (silanol))) works in regards to pH /pKa for binding and elution of DNA
- Q What is the relationship between % transmittance andconcentration?
- Q Describe an ether synthesis.
- Q How much heat is evolved in converting 1.00 mol of steam at150.0 ∘C to ice at -50.0 ∘C? The heat capacity of steam is 2.01J/(g⋅∘C) and of ice is 2.09...
- Q Answer the following chemistry question:3. (a)  The pKa for ferric ion Fe(+3) is2.   The pKa for cupric ion Cu(+2) is9.                Whichis a stronger Bronsted acid?  Give and explain tworeasons for the ten million-fold difference...
- Q A) what is the definition of an \"amhiprotic\" substance?B) Illustrate with two equations how the dihydrogen phosphateanion is amphiprotic:C) Validate/illustrate your answer to part (B) with two balancedequations and their...
- Q 1.How many coulombs are requiredto produce 47.9 g of cobalt metal from a solution of aqueous cobalt(III)chloride Usescientific (E) notation with 2 numbers after the decimalpoint.2.How many grams ofchromium may...
- Q A one molar solution of the weak base methylamine,CH3NH2 is diluted with water until theconcentration is ½ molar. Which of the following statements arecorrect for this process?1. [OH-] / [CH3NH3+]remains...
- Q Add the physical state for each substance in the followingaqueous reactions. Then write and balance a net ionic equation foreach reaction. (a) Cr2(SO4)3 + KOH → Cr(OH)3 + K2SO4 (aq)...
- Q Ethanol melts at -114.0 ∘C. The enthalpy of fusion is 5.02kJ/mol and the enthalpy of vaporization is 38.6 kJ/mol. Thespecific heats of solid and liquid ethanol are 0.970 J/g⋅K and...
- Q Iron-56 has one of the highest binding energies of all nuclides.Calculate its nuclear binding energy inkJ per mol nucleon. 1 amu is equivalent to 1.492 ´ 10-10J.mass of iron-56 nuclide55.934994...
- Q Compare the energy cost, in ATP equivalents, of synthesizingstearate from mitochondrial acetyl-CoA to the energy recoveredbydegrading stearate to CO2.
- Q 12. Calculate the pH of a 0.10 M solution of potassium formate,KHCOO. Ka of formic acid (HCOOH) = 1.8 x 10^-4. Write thedissociation equation and label each ion as acidic,...
- Q aluminum sulfide and water react to form aluminum hydroxide andhydrogen sulfide gas. suppose 128.00 g of aluminum are added to154.45 mL of water(d=1.00 g/ml). Answer the followingquestions.a).before the reaction, how...
- Q 10. (9 pt) What reagents and collisions are needed tocomplete the following reaction? Give a complete mechanism, and usea free energy reaction coordinate diagram to show WHY the desiredproduct is...
- Q At a particular temperature the equilibrium constant for thereaction: H2(g) + F2(g) ⇔ 2HF(g) is K = 25.0. A reaction mixture ina 10.00-L flask contains 0.33 moles each of hydrogen...
- Q One liter of a 0.1M Tris buffer (pKa=8.3) is adjusted to a pH of2.0. A) What are the concentrations of the conjugate base and weakacid at this pH? B) What...
- Q How many grams of silver are formed when 2.0 g of tin react with15 mL of 1.0 M silver nitrate solution?
- Q EXPERIMENT #6 DETERMINATION OF THE CONCENTRATION OF TARTARICACID IN WINE1. Why must the sodium hydroxide concentration be reported tofour significant figures? Why not use only two significantfigures?2. In the procedure,...
- Q Question25.0 mL of ethanol (density = 0.789 g/mL) initially at 7.0 C ismixed with 35.0 mL of water (density = 1.0 g/mL) initially at 25.3C in an insulated beaker. Assuming...
- Q 3. a. Classify the following minerals:CaZrO3, FeCr2O4, SrTiO3,ZnAl2O4; as spinels or perovskites. Show how you came to thisclassification.b. Describe the important electrical and/or magnetic propertiesof spinels, perovskites and non-stoichiometric oxides....
- Q A gas containing nitrogen, benzene, and toluene is inequilibrium with a liquid mixture of 30.0 mole% benzene–70.0 mole%toluene at 50.0°C and 15.0 atm. Estimate the gas-phase composition(mole fractions using Raoult's...
- Q CHROMATOGRAPHYIn running a TLC analysis of ferrocene and acetylferrocene, thetwo substances were analyzed on a TLC plate in 3 different solvents(1:1 petroleum ether/diethylether, and petroleum ether anddiethylether, respectively). What would...
- Q A scientist measures the standard enthalpy change for the followingreaction to be -613.2 kJ :P4O10(s) + 6H2O(l)-->4H3PO4(aq)Based on this value and the standard enthalpies of formation forthe other substances, the...
- Q Description: Our solar system is very diverse when it comes tothe gas composition on our planets. On Mercury, which has almost noatmosphere, the pressure is less than 10-14 bar. Venus...
- Q 1.50L reaction vessel was initially filled with 0.150moles of COand 0.300moles of H2. After equilibrium is established, the vesselis found to contain 0.119moles of CO. What is the equilibriumconstant for...
- Q How many milliliters of water vapor,H2O(g), measured at 318 oC and 735torr, are formed when 33.6 mL of NH3 at 825 torr and 127oC reacts with oxygen according to the...
- Q Balance the following oxidation reduction reaction under acidicconditions. Show your work. MnO4− + H2SO3→ SO4 2− + Mn2+
- Q Iodine - 131 is used in medical imaging. Iodine - 131 has ahalf-life of 8days. How much Iodine - 131 remains in a patient'ssystem after 1 month?
- Q What is the difference between the endpoint and stiochiometricpoint in a strong acid/base titration?A) The endpoint is when the pH is exactly 7B) The stoichiometric point is when the pH...
- Q Answer the following short answer questions.A) What feature of a reaction would ensure that its rate wouldrespond to a pressure jump?B) Compare and contrast the pre-equilibrium and steady stateapproximations.C) Explain...
- Q nitrogen and hydrogen combine at high temperature, inthe presence of a catalyst, to produce ammonia. N2(g)+3H2(g) >2NH3(g). assume 0.270 mol of N2 and 0.877 mol of H2 are presentinitially. Questions-...
- Q 1. A student prepares two aqueous solutions. For eachsolution:-Calculate the molarity.-Write a chemical equation representing the formation of thesolution. Be sure to include phase labels and to show any ions...
- Q How much heat is required to convert solid ice with a mass of605 g and at a temperature of -12.5 °C to liquid water at atemperature of 55.5 °C? (The...
- Q Copper can be electroplated at the cathode of an electrolysiscell by the half-reaction.Cu2+(aq)+2e−→Cu(s)Cu2+(aq)+2e−→Cu(s)Part AHow much time would it take for 338 mgmg of copper to be platedat a current of...
- Q The effect of an inhibitor on an enzyme was tested and theexperiment gave the results below. Plot on Excel the data using adouble-reciprocal plot (Lineweaver-Burke), determine Kmand Vmax of the...
- Q A solution is found to be 0.0404% by weight CoBr3.What is the concentration of the Br1- ion expressed inppm?
- Q Consider the following reaction:2 Al + 3 CuCl2 → 3 Cu + 2 AlCl3The reaction begins with 83.16 g of Al and 49.19 g of copper IIchloride.How much of the...
- Q Draw the electron-group geometry for HNO3, in which hydrogen isattached to one of the oxygens and all oxygens are attached tonitrogen. To simplify, ignore the hydrogen when you name themolecule's...
- Q Consider this reaction:2CH3OH(l) +3O2(g)2O(l) +2CO2(g) H = –1452.8 kJ/mola.Is this reaction endothermic orexothermic?b.H if the equation ismultiplied throughout by 2?c.H if the direction of thereaction is reversed so that the...
- Q 1.Draw a Lewis structure for each of them. Remember that somemolecules violate the Octet Rule in different ways. Some of theseuse multiple bonds and some don't. You need to figure...
- Q student is asked to standardize a solution of calcium hydroxide.He weighs out 0.993 g potassium hydrogen phthalate (KHC8H4O4, treatthis as a monoprotic acid). It requires 20.1 mL of calciumhydroxide to...
- Q Explain why each of the names is incorrecta) 2,2-dimethyl-6-ethylheptaneb) 5-ethyl-3-methylheptanec) 2-Isopropyl-4-methylheptaned) 5-methylcyclohexanole) 1-bromo-4-pentanolf) 2-methyl-N, N-dimethyl-4-hexamineg) 4-bromo-3-pentanol
- Q 1. What volume of 0.158 M HCl is required to neutralize 2.87grams of Mg(OH)2?2. Which ion(s) is/are spectator ions in the formation of aprecipitate of BaSO4, when aqueous solutions of...
- Q Separation techniques were performed on a sample containing onlysand and salt. The mass of the initial sample was 10.50 g. Afterthe separation, 3.10 g of sand and 4.00 g of...
- Q How would Acetic Acid, HC2H3O2 and Sodium Acetate, NaC2H3O2 workas a buffer? Explain with equations.
- Q Estimate the pH of a 25o C solution of both ammonium chloride,NH4Cl, and acetic acid in water, at a concentration of0.10 M, each.
- Q Ammonium bisulfide, NH4HS, forms ammonia, NH3, and hydrogensulfide, H2S, through the reactionNH4HS(s)?NH3(g)+H2S(g)This reaction has a Kp value of 0.120 at 25 ?C. Anempty 5.00-L flask is charged with 0.300g of...
- Q Determine the pH for each of the followingsolutions:a)A 300. mL solution of 18.4 mMHNO3b)A 125 mL solution of 2.94 Mcyclohexylaminec)A 500. mL solution of1.37×10–7 MCa(OH)2d)A 50.0 mL solution of 53.5...
- Q Calculate the pH of the following solutions: (a) 10-3 M HClO4(note that for HClO4 the pKa = -7) (b) 10-3 M HOCl (note that forHOCl the pKa =7.52) (x) 10-6.5...
- Q A 0.15 g sample of a purified protein is dissolved in water to2.0ml of solution. The osmotic pressure is found to be 18.6 torr.Calculate the molar mass of the protein.
- Q A fictional company has been producing propene oxide, C3H6O,from propene, C3H6, with a 96.0%yield. The process requires the useof a compound called m-chloroperoxybenzoic acid, C7H5O3Cl,which can be abbreviated as mCPBA....
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