Chemistry question and answers for August 08, 2023
- Q An alloy contains 97% by mass aluminium and 3% by masscopper.8. Using 100 kg of material as the starting point, whatproportion of the atoms are copper?
- Q 1a.Explain the specific functions of an internal standard in i)HPLC ii) AESb. Define the following terms in atomic spectroscopy. Give twoexamples for each of them.i) releasing agentsii) protective agentsiii) ionization...
- Q You are asked to prepare 500. mL of a 0.300 M acetate buffer atpH 4.90 using only pure acetic acid (MW=60.05 g/mol, pKa=4.76),3.00 M NaOH, and water. Answer the following...
- Q The reaction below has an equilibrium constant K p =2.2× 10 6 at298 K. 2 COF 2 (g)⇌ CO 2 (g)+ CF 4 (g) Part A Calculate K p for...
- Q What is the difference between the Normal Hydrogen Electrode(NHE) and the Reversible Hydrogen Electrode (RHE)?- Also, if a redox happens at the NHE of 0.2 V, please calculatethe potential for...
- Q Another unknown was tested using this procedure. Upon theaddition of 6M NH3 and 6M HNO3, no precipitate formed. (NH4)2CO3was then added. A precipitate formed and the mixture wascentrifuged and decanted....
- Q Define reaction rate. Distinguish between the initial rate,average rate, and instantaneous rate of a chemical reaction. whichof these rates is usually fastest? The initial rate is the rateused by convention....
- Q Copper salts – Assume that, in this question, thecation-to-anion size ratio should be in the 0.25 – 1 range and thatall compounds adopt cubic cells. a) The chloride atoms are...
- Q One excited state of the sodium atom lies at 25, 739.86 cm-1above the ground state, another lies at 50 266.88 cm-1. Supposethey are connected by a perturbation equivalent in energy...
- Q The deprotonation of acetic acid goes by the mechanismCH3COOH + H2O ⇒CH3COO– + H3O+Assume the pKa of acetic acid at 25°C is 4.76, and the forwardrate at a pH of...
- Q An unknown amount of riboflavin (100 tablets) was dissolved in 1liter of water, one milliliter of the solution obtained was dilutedto one liter. The measured fluorescence of the resulting solutionwas...
- Q For questions 13-14, use the information provided below from theexperiment Identification of an Unknown. The molecular masses andreactions are provided for you.NaHCO3         KHCO3                       Na2CO3                       K2CO3             NaCl               KCl          84.01 g/mol    100.12 g/mol  105.99 g/mol  138.21g/mol  58.44 g/mol    74.55g/mol2 NaHCO3...
- Q The density of a gas is 1.76g/L at 1 atm and 10 °C. What is itsdensity at 1.5 atm and 20 °C?A. 4.65g/LB. 3.23g/LC. 1.52g/LD. 2.15g/LE. 2.55g/L
- Q a) Describe the differences between ionization energy, workfunction and electron affinity.b) Show their location with respect to Evac on a banddiagram.
- Q The equilibrium constants of the reactionsFeO(s) + CO(g) = Fe(s) + CO2; K1FeO (s) + H2(g) = Fe(s) + H2O (g) ; K2temp (oC) 600 700 800 900 1000-------------------------------------------------------------K1 0.900...
- Q Are the following compounds acidic, basic, or neutral?1. barium nitrate2. sodium chloride3. potassium nitrite4. iron III chloride5. sucrose6. magnesium carbonate7. lithium sulfite8. naphthalene9. potassium permanganate10. lead II chloride11. copper II...
- Q Experiment #2: An experiment run found that the two enantiomersof Isoflurane do not act the same as anesthetics, in that it took asmaller amount of one to produce the same...
- Q 1. Answer any three of the following parts (a) - (d). (a) Thehydrolysis of a compound A-B in a dilute aqueous solution proceedsin one elementary step: A-B + H2O →...
- Q What role do you think light plays in electron movement? Sincelight also functions as a wave, what is the relationship betweenlight and electrons?
- Q Based on the structures of Isoflurane & Sevoflurane and whatyou have learned in Modules 5 and 8 this semester, would you expectthese molecules to be hydrophilic or lipophilic? Explain youranswer....
- Q Describe what is infrared (IR), nuclear magnetic resonance (NMR)and mass spectrometry (MS) and tell what chemical structureinformation can be determined from each.
- Q I. what is the energy content (GJ/ha) of willow at 55% moisturecontent, if it has a calorific value of 7MJ/kg and a yield of 22tonnes/ha at 55% M.C?II. if one...
- Q Pure l-phenylalanine has a specific rotation of -35.1 degrees.What is the enantiomeric excess of a 10.0 g/mL solution ofphenylalanine which when placed in a standard 1.00 dm cell andanalyzed in...
- Q Assuming 100% dissociation, calculate the freezing point (TfTf)and boiling point (TbTb) of 1.39 m SnCl4(aq)1.39 m SnCl4(aq).Colligative constants can be found in the chempendix.
- Q Howcan I distinguish Cl- ion trans effect and easy leavinggroup?
- Q Given cyclopentane at 1000kPa, calculate the following:a) The saturation temperature associated with the pressure thatyou were given, assuming that the system is in vapour-liquidequilibrium. Use an equation of state method...
- Q What fraction of ethane-1,2-dithiol is in each form (H2A, HA-,A2-) at pH=9.25? Please do show all work. Thank you!
- Q What is the lowest temperature at which the following reactionis spontaneous? H2O(g) + C(graphite) ----> H2(g) + CO(g)
- Q The data below shows the production of CO2 fromcarbonic aanhydrase. The zero-order rate constant was measured atdifferent temperatures. Calculate EA , DeltaH+ , the Arrhenius Constant, and DeltaS+.T(K)289293.5298.1303.2308113.5k (10-6)1.041.341.531.892.292.84
- Q A 50.0ml aliquot of 0.100 M NaOH is titrated with0.200 M HCl. Calculate the pH of the solution after addition of0.0, 5.0, 10.0, 25.0, 35.0, 45.0, 55.0 of HCl. Plot...
- Q Redox Reactions: Less active metals like copperwill reacti with concentrated nitric acid to produce nitric oxidegas and the Cu2+(aq) ion at 25C.A) Write balanced chemical equation for this process.             6H+(aq) +...
- Q 1) Can you tell me spontaneous redox rxn at 25°C?i. Au (s) + Fe^3+ (aq) → Au^+ (aq) + Fe^2+ (aq)ii. 2 Fe^3+ (aq) + 2 I^– (aq) → 2...
- Q If theres saturated aqueous solution of Fe(OH)2 at 25°C and Ksp= 4.87 × 10−17, which one is false statement?A. Adding acid to the solution will increase the solubility.B. Fe(OH)2 is...
- Q 1) Cr2O7^2- (aq) + NO2^-(aq) -> Cr^3+(aq) + NO3^-(aq)Whats the coefficient of water after balancing redox rxn, whichin acidic solution?2) Which solution will increase molar solubility of CuCO3(Ksp=2.3*10^-10) at 298K?...
- Q Draw a flow diagram for the separation of benzoic acid, phenol,and naphthalene. Enough detail must be included for someone toperform the experiment, however, you do not need to include massesor...
- Q 1. Part A) Write the intact-compound equation for theneutralization of aqueous hydrofluoric acid by aqueous calciumhydroxide. Express your answer as a chemical equation.Identify all of the phases in your answer.2....
- Q Please answer and explain. Thank you. (Biochemistry)The water molecule is unique among the hydrides among the secondperiod elements, C,N, O and F. CH4 and HF are all gases. Wateralone is...
- Q Calculate the pH of the solution that results from each of thefollowing mixtures:A) 55.0 mL of 0.16 M HCHO2 with 75.0mL of 0.13M NaCHO2B) 130.0mL of 0.11 M NH3 with...
- Q In Europe, gasoline efficiency is measured in km/L. If yourcar's gas mileage is 22.0 mi/gal , how many liters of gasolinewould you need to buy to complete a 142-km trip...
- Q 85. A fuel mixture used in the early days of rocketry consistedof two liquids, hydrazine (N2H4) and dinitrogen tetroxide (N2O4),which ignite on contact to form nitrogen gas and water vapor.a....
- Q 1. A calcite sample yields the following data for thedetermination of calcium as Calcium Oxide (CaO): 55.95, 56.00,56.04, 56.08, and 56.23. Should we reject 56.23 with 95%confidence?
- Q If you were able to produce nanocrystalline powders of FeTi of10 nm crystallite size, for incorporating into the ferrite, whatwould be the peak width for the 100% peak in the...
- Q Calculate the molality, molarity,and mole fraction ofNH3 in an 14.60 mass % aqueous solution (d =0.9651g/mL)
- Q Use the current-voltage equation for the Na+ and K+ currents toderive the GHK equation for the reversal potential for a channelpermeable to both Na+ and K+.
- Q #16.98 Calculate the solubility (in grams per 1.00×102mL ofsolution) of magnesium hydroxide in a solution buffered at pH = 12.g/(1.00×102mL)B) How does this compare to the solubility of Mg(OH)2 in...
- Q Answer and explain:5. True or False: The entropy of mixing perfect gases is alwayspositive.6. True or False: The chemical potential of pure liquid water atstandard conditions is higher than the...
- Q 1. Which reagent would be best for converting D-fructose toD-mannitol?2. What determines whether or not a sugar isreducing?
- Q In recent years, bioplastics have been used in various fields,it can be replaced with conventional plastics in the field ofapplication which can be used in various categories such as foodpackaging,...
- Q A restaurant (Restaurant A) uses an anaerobic digester to treatthe refuse oil after cooking, with the goal to use the CH4generated as fuel source for cooking. It typically uses canola...
- Q Given that K a1 =5.9 x 10 −3 andK a2 =6.0x10 −6, calculate the pHafter titrating 70 mL of 0.10 M H2SO3 with 50mL of 0.10 M KOH.Consider the titration...
- Q Chromatography has many applications. Research one applicationof chromatography and explain how it is used and whatcharacteristic is used for the separation of the analyte
- Q QUESTION 15:The conversion of acetophenone,C6H5COCH3, to benzoic acid,C6H5COOH, is accomplished by the use of whichoxidizing agent?A.Ag(NH3)2+B.O3C.NaOI (I2 in NaOH)D.RCO3HE.Cu++QUESTION 16:Choose the correct statement:A.Hexanal has a much lower boiling point than...
- Q QUESTION 15:The conversion of acetophenone,C6H5COCH3, to benzoic acid,C6H5COOH, is accomplished by the use of whichoxidizing agent?A.Ag(NH3)2+B.O3C.NaOI (I2 in NaOH)D.RCO3HE.Cu++QUESTION 16:Choose the correct statement:A.Hexanal has a much lower boiling point than...
- Q 1) Whats the molar solubility of MgCl2 (Ksp=8.8*10^-9) in HClsolution with pH 1.5 (detailed step please)2) Which solution will increase molar solubility of CuCo3(s) at298K? (Ksp of CuCO3 is 2.3...
- Q To 1.0 L of a 0.34 M solution of HClO2 is added 0.15 mol of NaF.Calculate the [HClO2] at equilibrium.PLEASE show ALL work!!
- Q Oxygen therapy uses various devices to provide oxygento patients having difficulty getting sufficient amounts from airthrough normal breathing.Among the devices are nasal cannula, which transport oxygen throughsmall plastic tubes from...
- Q In IR spectroscopy, why do heavier atoms have IR absorptions atlower frequencies?
- Q What information about the progress of the synthesis ofacetaminophen could be inferred from the TLC?
- Q A 1.08×103-mg sample of impurepotassium carbonate was titrated with46.09 mL of 0.2770 Mperchloric acid. Calculate the percentageofpotassium carbonate in the sample.
- Q Calculate the amount (in mL) of 0.0462M calcium hydroxide thatwould be required to completely react with 126.25 mL of a 0.0182MHCl solution. do not enter the unit mL in your...
- Q In each situation below, we are adding aqueous solutions of HNO3to NH3, and the calculating the PH of solution formed. (For ammoniaKb=1.8x10^-5)a)Write the reaction that describes what happens when HNO3...
- Q Write a short account on the chemical and IR spectroscopicevidence for the existence of benzyne.Despite the expense and time commitment, the total synthesis oflarge natural products continues to be of...
- Q Explain the control system configuration for crude oil?
- Q The weak acid HZ has a Ka of 2.55 x 10-4. Calculate the pH of a0.235 M solution.
- Q Choose a False statement:Allosterity can not be negativenone of the answers are correctHomotropic regulation occurs when a normal ligand of theprotein is the allosteric regulatorHeterotropic regulation occurs when a different...
- Q You have a solution that contains 25 g of an unknownnon-ionizing polymer in a 250 mL solution of chloroform (CHCl3 ).The osmotic pressure of this solution at 25 â—¦C is...
- 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 K p =1.60× 10 −3 . If...
- Q A 6.00-L sample of C 2 H 4 (g) at 2.00 atm and 293 K is burnedin 6.00 L of oxygengas at the same temperature and pressure to form carbon...
- Q 1. Calculate the change in total internal energy for a systemthat releases 2.38 × 104 kJ of heat and does 6.80 ×104 kJ of work on the surroundings. Enter your...
- Q 1. The pH of natural water and the effects of globalwarminga) It is a well-known fact that the increase in atmosphericCO2 concentration will result in global warming. Such effects willlikely...
- Q The density of a gaseous compound is 2.06 g/L at STP. What isthe most likely formula of this gas?Ionization engergy of Na: 496 kj/molElectron Affinity of F: 328 kJ/molEnergy to...
- Q How is SDS-PAGE technique different from cellulose acetateelectrophoresis?
- Q what is the handbook value of concentration of calcium carbonatein hot water
- Q list the steps for balancing a nuclear reaction
- Q Photons are the force carriers and source of electromagneticinteractions between electrons and protons. How are electromagneticinteractions described by wave mechanics? (i.e. Schrodinger'sequation, the Hamiltonian operator, the Born probability densityfunction, etc).
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