Chemistry question and answers for September 09, 2023
- Q 4Au(s) + 16KCN(aq) + 3O2(g) + 6H2O(l) --> 4KAu(CN)4(aq) +12KOH(aq) Balance using half reaction method. show all steps
- Q Sulfur hexafluoride and Sulfur tetrafluoride are two commonhalides of sulfur.a) Draw their lewis dot structures and describe their molecularshapes including bond angles.b) Write a balanced reaction for the synthesis ofSF6.c)...
- Q Titration of 50.0mL of 0.100M HX (Ka=1.5x10^-5) with 0.100MNaOH. Calculate the pH of:- buffer formed at the addition of 12.5mL NaOH- buffer formed at the addition of 25.0mL NaOH- buffer...
- Q Cl=8 F=22(a) How many chlorine trifluoride molecules are formed in thereaction depicted above?(b) How many chlorine molecules remain after the reaction hasgone to completion?(c) How many fluoride molecules remain after...
- Q a) Write a balanced reaction for the formation of a polysiloxanestarting form (CH3)2SiCl2b) Liquid silcones (polysiloxanes) are used of a variety ofapplications what are they and why are silicones used...
- Q A) A buffer solution contains 0.484 MKHCO3 and0.314 MK2CO3.Determine the pH change when0.126 mol NaOH is added to1.00 L of the buffer.pH after addition − pH before addition = pH...
- Q Calculate the pH of a 0.01 M solution of sodium benzoate.A: Dissociation constant of benzoic acid.B: Calculate the hydrolysis constant of sodium benzoate.C: Calculate the pH of the 0.01 M...
- Q A) Consider how best to prepare one liter of a buffer solutionwith pH = 4.94 using one of the weakacid/conjugate base systems shown here.Weak AcidConjugate BaseKapKaHC2O4-C2O42-6.4 x 10-54.19H2PO4-HPO42-6.2 x 10-87.21HCO3-CO32-4.8...
- Q The reaction of nitrogen gas with hydloric acid is asfollows:N2 (g) + 6 HCl(g)Â Â
- Q Explain what is olefin metathesis? in one paragraph
- Q please calculate the1.theoretical yield,2.percent yield, and3. overall percent yield frombenzaldehyde.my products weight was 2.137 gexperiment was \"Isolation ofTetraphenylcyclopentadienone, then Recrystalization ofTetraphenylcyclopentadienone\"HERE IS MY PROTOCOL I FOLLOWED TO GET MASS OF2.137...
- Q A textile finishing process involves drying a fabric that hasbeen treated with a volatile solvent. The drying process involvesevaporation of solvent and removal of solvent vapor by air. The wetfabric...
- Q Al(OH)3(s) + HCl(aq) --> AlCl3(aq) + H2O(I) a) balance theequation b)calculate the number of grams s of HCl that can reacctwith 0.500 g of Al(OH)3. c) calculate the number of...
- Q What are the principles of surface sorption bysolid?
- Q Aqueous hydrochloric acid HCl will react with solid sodiumhydroxide NaOH to produce aqueous sodium chloride NaCl and liquidwater H2O . Suppose 28.1 g of hydrochloric acid is mixedwith 17. g...
- Q Find the Gibbs free energy for G(T,P) for an ideal gas withconstant cv.
- Q Phosphorus pentachloride decomposes at highertemperatures.PCl5(g) ⇄ PCl3(g) + Cl2(g)An equilibrium mixture at some temperature consists of5.93 g PCl5, 208.23 g/mol4.86 g PCl3, 137.33 g/mol3.59 g Cl2, 70.91 g/molin a 1.00-L...
- Q Calculate the freezing point of a solution of 30.0 g methylsalicylate, C7H6O2, dissolved in 800. g of benzene, C6H6. Kf forbenzene is 5.10
- Q Choose all of the processes from below which describe changeswhich are independent of the path by which thechange occurs.the elevation increase experienced by a traveller travellingfrom Grand Isle, LA to...
- Q 1. Explain in terms of ion concentrations and Ksp why aprecipitate forms for some solutions.2. When ammonia is added to a solution that has Cu(OH)2(s)precipitate in it, the precipitate dissolves....
- Q Use a table of thermodynamic data to calculate the enthalapy(delta H) for the following three reactions:Mg (s) + 1/2 O2 (g) --> MgO (s)Mg (s) + 2 HCl (aq) ----->...
- Q Find the IR and NMR spectra of Ibuprofen from the internet.Label the peaks and please give a detailed interpretation of thecharts.
- Q The equilibrium constant, K, for the following reaction is1.20×10-2 at 500 K. PCl5(g) PCl3(g) + Cl2(g) An equilibrium mixtureof the three gases in a 1.00 L flask at 500 K...
- Q 28 mL of 0.10 M HCl is added to 60 mL of 0.10 M Sr(OH)2. Usingproper unit cancellation, determine the concentration of OH− in theresulting solution.
- Q Please check it out within 30 minutes. Please provideexplanation or working so I can check with my answer.Question: In a study of the system, Cl2(g) + Br2(g) 2BrCl(g),several different reaction...
- Q 12. Liquid nitroglycerin is a shock sensitive compound thatproduces gases in an exothermic (heat releasing) reaction shownbelow.4C3H5(NO3)3(l) → 6N2(g) + 10H2O (g) +12CO2 (g) + O2 (g)If 16 ounces (454...
- Q Which 3 of the following process techniques will enhance thenumber of die from each wafer ?Improve filtration of gas and chemicals.Work with vendors to increase the service interval fortools.Use a...
- Q For the diprotic weak acid H2A, K a1 = 3.1 × 10 − 6 and K a2 =7.2 × 10 − 9 . What is the pH of a 0.0500...
- Q What is the relationship between photons of increasingwavelenght and frequency?What is the relationship between photons of increasing frequencyand energy?wha is the relatioshi between photons of increasin energy andwavelength?
- Q Discussion about: Nuclear EnergyThere are different public opinions about using nuclear energyin producing electrical energy. Nuclear reactors are associatedwith harmful nuclear radiation and there is a problem of thestorage of...
- Q why does double focusing mass analyser provide higherresolution than magnetic sector mass analyser?calculate the ratio of (M+1)+ to M+ peak height forC4H10NOCalculate the ratio of (M+2)+ and (M+4)+ to M+...
- Q NiO(s)+CO(g)⇌Ni(s)+CO2(g)Kc=4000.0 at 1500 KIf a mixture of solid nickel(II) oxide and 0.12000 M carbonmonoxide is allowed to come to equilibrium at 1500 K, what will bethe equilibrium concentration of CO2?
- Q 1. We wish to produce a product B from a reactant A in a PFRwith Q = 4 L/min and CA0 = 2 mol/L. However, another reaction isalso occurring, forming...
- Q The energy needed for the following process is 1.960 × 104kJ/mol:Li(g) → Li3+(g) + 3e−If the first ionization energy of lithium is 5.20 × 102 kJ/mol,calculate the second ionization energy...
- Q An equilibrium mixture from the following reaction was found tocontain 0.225 mol/L of SM , 0.306mol/L of SR, and 0.306 mol/L ofHM. If the volume of the reaction vessel was...
- Q What are the decay rates, branching ratios and decay energies forU-235?
- Q The compound P4S3 is used in matches. Itreacts with oxygen to produce P4O10 andSO2. The unbalanced chemical equation is shownbelow:P4S3(s) + O2(g) -->P4O10(s) + SO2(g)What mass of SO2 is produced...
- Q for question 3 im getting 96.234 sec but it says itswrong but close to the answer.for activation energy.. i get 24.6 kj/mol but its wrong3) You mix together in the...
- Q 100 mL of buffer solution that is 0.15M HA (Ka=6.8x10-5) and 0.20M NaA is mixed with 15.2mL of 0.35MNaOH. What is the pH of the resulting solution?
- Q How much heat energy is required to convert 53.0 g of solidethanol at -114.5 °C to gasesous ethanol at 141.8 °C? The molarheat of fusion of ethanol is 4.60 kJ/mol...
- Q Theuranium used as nuclear fuel and in bombs has to be enriched beforeuse. Explain what enrichment means and describe a method used toenrich uranium.2. Describe why the mining or uranium...
- Q Draw the following disaccharides as Haworth projections. For eachstructure, label ALL the anomeric carbons with an asterisk andcircle ALL the reducing ends. Any unspecified hydroxyl on ananomeric carbon can be...
- Q The experimental empirical formula of a magnesium oxidecompound was determined. To do this a magnesium ribbon weighing0.252 g was heated in a crucible. From the data listed, determinethe empirical formula...
- Q if 92.8 grams of sodium nitrite are dissolved in 2.3L of water,the resulting solution has a molarity of
- Q Calculate the freezing point and boiling point of a solutioncontaining 7.90 g g of ethylene glycol (C2H6O2) in 92.7 mL ofethanol. Ethanol has a density of 0.789 g/cm3Calculate the freezing...
- Q The rate constant of the elementary reaction 2HI(g) H2(g) +I2(g)is k = 1.97 L mol-1 s-1 at 604°C, and the reaction has anactivation energy of 206 kJ mol-1.(a) Compute the...
- Q Hand draw the following transformations step by step, includingall intermediates. Ideally, also show electron pushingA. Conversion of asparagine to aspartic and isoaspartic acid inpeptides.B. Conversion of aspartic acid to isoaspartic...
- Q Calculate how many milligrams of the drug are contained in 2.0mLof a 3.0% (w/v) solutionofC17H19N3O3S
- Q The following mechanism has been proposed for the gas-phasereaction of chloroform (CHCl3) and chlorine:1) Cl2 ⇔ 2 Cl (fast, reversible)2) Cl + CHCl3 → HCl + CCl3 (slow)3) Cl +...
- Q 1.) The cell reactions occurring in abattery are given by:Cathode : 2MnO2 (s) + H2O (l) + 2e-→ Mn2O3 (s) + 2HO-(aq) E 0 red = +0.15 VAnode : Zn...
- Q 1. Moles                      a. Which has more mass, 1 g of C or 1 g of Pb?                                  b. Which has more mass, I mole of C or 1 mole of Pb?                                  c. How much...
- Q Consider the titration of a 26.0?mL sample of 0.175M CH3NH2 with0.155M HBr . Determine each of the following.A. the initial pHB. the volume of added acid required to reach the...
- Q which one of the following molecules is polar?a. CS2, b. SO2 c. XeF2 d.XeF4, e. SO3
- Q Consider each of the following ideal geometries for MXnmolecules (n = 3-6) and thte distortions described for each. Whatare the point groups of the ideal geometries and the distortedgeometries? 11....
- Q Given the data tables below for the concentrations of crystalviolet dye in the crystal violet-hydroxide reaction CV++ NaOH- --> CVOH + Na, calculate the order ofhydroxide if the order of...
- Q If 15.0 mL of a 1.5M HCl solution at 21.50C is mixed with 25.0mLof a 1.5M NaOH solution at 21.50C that is in a calorimeter, and thefinal mixed solution temperature...
- Q A galvanic cell consists of a standard hydrogen electrode and acopper electrode. Suppose that the copper electrode is immersed ina solution that is 0.1 M NaOH and that it is...
- Q A mixture of LiAlH4 and LiCl weighs 7.51 g. LiAlH4 reactsexothermically with ethanol according to the following equationLiAlH4(s) + 4CH3CH2OH(l) → Li[Al(OC2H5)4](s) + 4H214.48 g of Li[Al(OC2H5)4] is formed when...
- Q In an experiment, why would the concentration of a sampledecrease when changing the wavelength for a spectrophotometer from235 nm to 280 nm?This is just a general question, I would like...
- Q What are resistant starches/carbohydrates? Why are theyconsidered a ‘good’ carbohydrate? Would they be good to consumeduring exercise? After? Explain. What isretrogradation?
- Q - Minimum 2 pages- Topic: Scientific discovery/development relating to chemistry(no more than 3 years ago)Paper should cosnsist of:- Brief summary of the topic- Why it is important (why you chose...
- Q Describe and justify the optimal type/amount ofcarbohydrate consumption for various times related to exercise(pre-, during-, post-)
- Q balance the following oxidation reduction in an acidic solutionCl2(g) = Cl– (aq) + OCl–(aq)(hint: this reaction is a disproportionation, meaning the sameelement undergoes both oxidation and reduction. Use Cl2 as...
- Q The standard enthalpy change for the following reaction is -170kJ at 298 K. 2 Cu(s) + 1/2 O2(g) Cu2O(s) ΔH° = -170 kJ What is thestandard enthalpy change for the...
- Q You added 20 mL of 0.20M solution of Ba(OH)2(aq) to 50 mL of0.10M solution of HCl(aq). The pH of the resulting solution is________.
- Q Balance the following redox equation in basic conditions:Ag(s) + MnO4â»(aq) ⟶MnO2(s) + Ag+(aq)What is the stochiometric coefficient for H2O in thebalanced equation?
- Q Question 1How many orbitals are in a 4d subshell?135674 pointsQuestion 2Which of the following requires the greatest amount of energy toremove one valence electron from an atom?AlGaCSiN4 pointsQuestion 3Which of...
- Q Using the following data, calculate the ï„Hrxnfor thereaction: C2H4(g) + H2(g) →C2H6(g)(ch8)1.H2(g) + . O2(g)ïƒ H2O(â„“)ï„H1= –285.8 kJ2.C2H4(g) + 3 O2(g) ïƒ 2 H2O(â„“) + 2CO2(g)ï„H2= –1411 kJ3.3 H2O(â„“) + 2 CO2(g)...
- Q Every time the compound is contaminated the melting range willgo up.Group of answer choicesTrueFalse
- Q Heat of Vaporization and Heat of FusionLearning Goal:To calculate the total energy required to convert a solid to agas using heat capacity, heat of fusion, and heat ofvaporization.The amount of...
- Q What process would you use to disrupt the primary level oforganization of a protein? [Select all that apply]A. HydrolysisB. DenaturationC. HydrogenationD. AcidificationE. Enzymatic digestion (Protease)
- Q Part A -Bovine InsulinAn aqueous solution containing 1.0 g/liter of bovine insulin (aprotein not ionized) has an osmotic pressure of 3.1 mm Hg at 25
- Q A miniature volcano can be made in the laboratory with ammoniumdichromate. When ignited, it decomposes in a fiery display.(NH4)2Cr2O7(s) → N2(g) + 4 H2O(g) + Cr2O3(s) If 0.70 g of...
- Q What are the critical temperatures and pressure values of threedifferent fluids, namely CO2, N2 and Air? Discuss which is moresuitable for use in supercritical fluid extraction and why.
- Q Calculate the pH after 0.14 mole of NaOH is added to 1.09 L of asolution that is 0.49 M HNO2 and 1.18M NaNO2, and calculate the pH after 0.28 moleof...
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