Chemistry question and answers for July 03, 2023
- Q I am doing a green project for chemistry and I have to proposefour reactions that I would like to \"green\" and then propose achange (catalysis, solvent or reagent) of how...
- Q In a lab, using a styrofoam cup as a calorimeter is anexperimental limitation. Why? how could this be fixed?
- Q Assuming complete dissociation of the solute, how many grams ofKNO3 must be added to 275 mL of water to produce a solution thatfreezes at −14.5 ∘C? The freezing point for...
- Q A 425 mg sample of a weak diprotic acid is dissolved in enoughwater to make 275.0 ml of solution. The pH of this solution is3.08. A saturated solution of calcium...
- Q An ideal gaseous reaction (which is a hypothetical gaseousreaction that conforms to the laws governing gas behavior) occursat a constant pressure of 50.0 atm and releases 60.4 kJ of heat.Before...
- Q An aqueous solution boils at 106.3 ºC. What is its freezingpoint? (You will need to look up the two ks for water.) Bonus forthe experts: do you have enough information...
- Q The decomposition of benzene diazonium chloride C6H5N2Cl ->C6H5Cl + N2 follows first order kinetics with a rate constant of4.3 x 10-5 s-1 at 20 °C. If the initial partial pressure...
- Q How much heat energy, in kilojoules, is required to convert72.0g of ice at -18 degrees celsius to water at 25 degreescelsius?
- Q When we're out in the bars and people want to be funny (orannoying) people use the bottom of their beer bottle to tap the topof someone else's bottle. This makes...
- Q Cocaine, C17H23O4N, is a weak base with Kb=4.0x10^-9. It can bemade into a salt called cocaine hydrochloride, C17H23O4NHCl, thatis soluble in water (forming ions C17H23O4NH+ and Cl-. What is thepH...
- Q Why is cyclohexane used as a solvent in this experiment insteadof water? Water is much safer and much cheaper.
- Q hello
- Q A student used 0.710g of potassium hydrogen phthalate dissolvedin 50.0 mL of water as a primary standard (MW 204.23 g/mol). 35.50mL of sodium hydroxide aqueous solution were required to titratethe...
- Q How many grams of dry NH4Cl need to be added to 1.70 L of a0.700 M solution of ammonia, NH3 , to prepare a buffersolution that has a pH of...
- Q Diels-Alder Reaction of cis-Butadiene with MaleicAnhydride Experiment:Give the reaction conditions, ie. what apparatus, solvent,temperature and time will be used. How will the product be isolatedfrom the reaction mixture and how...
- Q 1) Both HC2O4− and HS− are amphoteric.Write an equation to show how HC2O4− can act as a base with HS−acting as an acid.Write an equation to show how HC2O4− can...
- Q Using the given data, determine the rate constant of thisreaction.A+2B ------> C+DTrial [A](M) [B](M) Rate (M/s)1. 0.270 0.380 0.02352 0.270 0.760 0.02353 0.540 0.380 0.0940K=?What units should be used?
- Q a. Bismuth-214 decays by alpha emission with a half-life of 19.7minutes. If 15.0 grams of Bismuth-214 is placed in a sealed vessel,what mass of the Bismuth will have decayed after...
- Q This Is a Chemical Engineering question but that isnt among thesubjectsProblem 4.39 Felder and Rouseeau Elementary Principles OfChemical Processes 4th EditionThe hormone estrogen is produced in the ovaries of females...
- Q Consider the balanced chemical reaction shown below. 1 Ca3P2(s)+ 6 H2O(l) 3 Ca(OH)2(s) + 2 PH3(g) In a certain experiment, 9.055 gof Ca3P2(s) reacts with 2.224 g of H2O(l). (A)Which...
- Q Calculate the mass of nitrogen dissolved at room temperature inan 88.0 L home aquarium. Assume a total pressure of 1.0 atm and amole fraction for nitrogen of 0.78.
- Q how do you do stoichiometry
- Q A 0.7221g sample of a new compound has been analyzeand found to contain the following masses of elements : Carbon0.2990g, hydrogen 0.05489g, nitrogen 0.2318g, and Oxygen0.1328g.call ate the empirical formula...
- Q Organic chemistry question about extraction lab...?Procedure:Place 2.0 g of the mixture of sucrose, acetylsalicylic acid andacetanilide into a 125 mL Erlenmeyer flask.Add 50 mL of methylene chloride (dichloromethane) and dissolve...
- Q 1) What is the value of Q when each reactant and product is in itsstandard state? (See Section 10.10 in the textbook for thedefinition of standard states.)What is the value...
- Q 3. The dissolution of NaCl has a standard enthalpy of +3.87 kJmol-1 at 25.0ºC and 1bar. Salt water has 35g/kg salt, and the heatcapacity of sea water is 3993 J...
- Q Question 1For a party tonight you want to make your special hamburgerrecipe. You have only the following ingredients:10 meat patties24 buns18 cheese slicesIf you need to make as many complete...
- Q What mass of glycerin (), a nonelectrolyte, must be dissolved in200.0 g water to give a solution with a freezing point of–2.00°C?
- Q An equilibrium mixture of PCl5(g), PCl3(g), and Cl2(g) haspartial pressures of 217.0 Torr, 13.2 Torr, and 13.2 Torr,respectively. A quantity of Cl2(g) is injected into the mixture,and the total pressure...
- Q The equilibrium constant KP for CCl4(g) f15g2a33g1.jpgC(s) + 2Cl2(g) is 0.76 at 700 K. What percentage (%) of CCl4 is convertedinto C and Cl2 when a flask charged with 3.00...
- Q The Keq for the equilibrium below is 5.4 × 1013 at 480.0°C. 2NO(g) + O2 (g) 2NO2 (g) What is the value of Keq at this temperaturefor the following reaction?...
- Q What kind of change is rusting of iron and what kind ofchange is conversion of a compound into its elements?a)Both are chemical changesb) both are physical changec)rusting of iron is...
- Q Draw a picture of a separatory funnel with an aqueous layer anda dichloromethane layer. label each layer. which of the two layerswould contain eugenol?Why is the drying agent added to...
- Q Use the vapour pressures (at 0 °C) of the pure substances belowto answer the following questions.SubstanceP* (kPa)cis-1-bromopropene (C3H5Br)9.493-methyl-1-pentene (C6H12)121. Determine the partial pressure (in kPa) of 3-methyl-1-pentene(C6H12) in the vapour...
- Q How many molecules are contained in a 6.05-g sample ofdimethylmercury?
- Q The concentration of hydrochloric acid can be measured byreacting the acid with pure sodium carbonate.               a) Write the balanced chemical equation for this reaction.               b) If the complete reaction with 0.8642 (±0.0005)...
- Q Fill in the table below using appropriate significantfigures.ArithmeticAlgebraic AnswerRelative Uncertainty (%)Absolute Uncertainty∛32.81±0.04(6.42 ± 0.02)/(8.914±0.006)+1.1245±0.0005      log(321±6/12±1)    antilog (2.345 ±0.008)
- Q How many moles of NH3 can be produced when 11.00 mol H2 reactwith 5.00 mol N2?_________mol NH3How many moles of each reactant are left over? Note that atleast one must...
- Q 1, Lemonade contains 20% sucrose, 2% salt (NaCl), and 0.5%citric acid (w/v each) in water. Calculate the mole fraction foreach of these components (sucrose, salt, citric acid andwater).2. 1000 kg...
- Q a) What is the theoretical absorption at 340nm of a 0.01Msolution of NADH, assuming a 1-cm pathlength?b) What dilution would be necessary to get the absorption froma) down to 0.5?c)...
- Q For the following electrochemical cell       Cu(s)|Cu^2+ (aq, 0.0155M)||Ag^+ (aq, 3.50 M)|Ag(s)write the net cell equation. Phases are optional. Do not includethe concentrations.Calculate the following values at 25.0 °C using standardpotentials as...
- Q Problem 16.73Ephedrine, a central nervous system stimulant, is used in nasalsprays as a decongestant. This compound is a weak organicbase:C10H15ON(aq)+H2O(l)â†âˆ’→C10H15ONH+(aq)+OH−(aq)A 0.035 M solution of ephedrine has a pH of 11.33.Part...
- Q For the equilibrium 2NO2(g) ⇌2NO(g) + O2(g), Kp = 2.0 ×10-2 at 365oC. Suppose 0.0600 molNO(g), 0.0150 mol O2(g), and 1.60 molNO2(g) are added to a rigid 2.00-L flask. Whatis...
- Q Using the data provided in the excel file, show all of your workfor the following calculations:a.) mean temperature of unmixed reagents (oC)b.) δελταT from graph (oC)c.) q absorbed by reaction...
- Q GIVE THE Chemical oxygen demand (COD)Glucose :Dihydrogen ( H2):NH4+ :
- Q The radius of a single atom of a generic element X is 127picometers (pm) and a crystal of X has a unit cell that isface-centered cubic. Calculate the volume of...
- Q Calculate the radius ratio for CaO if the ionic radii of Ca2 andO2– are 100 pm and 140 pm, respectively.Based on the radius ratio above, what is the expectedcoordination number...
- Q You want to decaffeinate your coffee by extracting the caffeineoutwith dichloromethane. It's too late to extract the caffeinefromthe coffee beans because you've already brewed yourself a 200mL cupof coffee. Your...
- Q Calculate (show the calculations) the pI for histidine,and aspartic acid.
- Q 1.The equilibrium constant, Kc, for the reaction A(g) + B(g) ïƒŸïƒ AB(g) is 115 at 25 oC. If 1.580 x 10â€1 mol of A and 4.721 x 10â€5mol of B are...
- Q A 0.450 g sample of impure CaCO3 is dissolved in50.0mL of 0.150M HCl.CaCO3 + 2HCl ---> CaCl2 +H20 + CO2the excess HCl is titrated by 7.45mL of 0.125M NaOHCalculate the...
- Q With the titration of 281 mL of 0.501 M carbonic acid (H2CO3)(Ka1 = 4.3 x 10-7, Ka2 = 5.6 x 10-11) with 1.1 M NaOH. How many mLof the 1.1...
- Q Assuming 100% dissociation, calculate the freezing point andboiling point of 0.550 mol of K3PO4 in 1.00 kg of water.A) freezing point: Answer in CelsiusB) boiling point: Answer in Celsius
- Q What is the pH of a 1.8 M solution of HClO4?Assuming complete dissociation, what is the pH of a 3.06 mg/LBa(OH)2 solution?Enough of a monoprotic acid is dissolved in water...
- Q Determine the composition in mole fraction of the followinggas.ComponentComposition Weight FractionMolecular WeightMole FractionMethane0.88016.04?Ethane0.04330.07?Propane0.04244.10?n-Butane0.03558.12?
- Q 2)Rank the following titrations in order of increasing pH at theequivalence point of the titration (1 = lowest pH and 5 = highestpH). 100.0 mL of 0.100 M HC3H5O2 (Ka...
- Q Signals from analytical method give a mean blank of 0.203 mV andstandard deviation of 0.052 mV. The quantitation limit of thismethod is: (1) 2.08 mV; (2) 0.72 mV; (3) 0.723...
- Q When aqueous solutions of ammonium carbonate and aluminum iodideare combined, solid aluminum carbonate and a solution of ammoniumiodide are formed. The net ionic equation for this reaction is:
- Q Analyst B, following the exact same procedure, carries out an analysis ofthe same acid andreports a concentration of 6.772 ± 0.004 M, after performing 6successful titrations (no data wasrejected).Questions:Is this...
- Q 1a.) Draw the pi molecular orbitals for 1,3,5 hexatriene, show theelectron population of each level, and identify the HOMO and theLUMO.1b.) Show using drawings of the HOMO of the maleic...
- Q Consider a grating with 84 lines/mm and 15 mm of illuminatedarea. Calculate the wavelengths of the first and second orderdiffraction at a reflective angle of 25 degrees if the angle...
- Q The density of air at ordinary atmospheric pressure and 25 ℃ is 1.19 g/L. What is the mass, in kilograms, of the air in a room that measures 14.5 ×...
- Q In Polymer chemistry, give a description on a specificcharacterization method This can include: Mechanical propertiesThermal properties Interacition among molecules CrystallinityMolecular Weight Diffisuion into Gas Layers. A few methods include:Surface Analysis,...
- Q Be sure to answer all partsTake all the thermodynamic data from your textbook. Assume thedata do not vary with temperature.A. Calculate Delta S univ for the reaction H2O2 (l) ---->H2O2(g)...
- Q 1.The molar solubility of iron(III) sulfide ina water solution is_________M2.The equilibrium concentration of hydroxideion in a saturated silver hydroxide solutionis__________M3.The equilibrium concentration of silver ionin a saturated silver chromate solutionis___________M4.A...
- Q Will iron(III) hydroxide precipitate from a pH = 1.00 solutionwith [Fe3+] = 1.0 x 10^-5? Ksp Fe(OH)3 = 6.3 x 10^-38
- Q The formation constant* of [M(CN)6]4– is 2.50 × 10^17, where Mis a generic metal. A 0.160-mole quantity of M(NO3)2 is added to aliter of 1.230 M NaCN solution. What is...
- Q Question 1: A solution of F– is prepared by dissolving 0.0712 ±0.0005 g of NaF (molecular weight = 41.989 ± 0.001 g/mol) in 164.00± 0.07 mL of water. Calculate the...
- Q If you mix 25mL of 0.25 Sodium phosphate dibasic(Na2HPO4) with 50mL of 0.1M Sodium phosphatemonobasic (NaH2PO4) what will be theresulting pH?
- Q 20 mL of 4.0 M acetone + 10 mL of 1.0 M HCl + 20 mL of 0.0050 MI2If the reaction is zero order inI2, approximately how long would it...
- Q 1. Who received the Noble Prize for the discovery of the Wittigreaction?2. The Wittig reaction usually gives a mixture of cis and transisomers, yet in thisreaction, only the trans isomer...
- Q The force constant for CO is 1860 N/m-1. determine the value ofthe zero point energy of CO in Joules/molecule and kJ/mole. Showwhy the answer is 12.84 kJ/mole
- Q a-Sketch the graph of mole fraction in feed (f) versusinstantaneous mole fraction in the copolymer (F) for thestyrene/methyl methacrylate copolymer using the copolymer equation.For free radical polymerization, r1 and r2are...
- Q What is the connection between dioxins and the Aryl Hydrocarbonreceptor?
- Q Balance the following skeleton reaction, calculate Eocell, and state whether the reaction is spontaneous. AgCl (s) + NO(g) --> Ag (s) + Cl- (aq) +NO3- (aq) [acidic]
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