Chemistry question and answers for August 02, 2023
- Q 15mL of bromobenzene to grams to moles6mL of nitric acid to g to molesthe limiting reactant of the two/ explaintheoretical yield of product
- Q In the solution containing both 0.10 M acetic acid and 0.10 Msodium acetate, the acetic acid undergoes ionization. The chemicalequation for this ionization reaction is the same as for a...
- Q Describe the components of a HPLC. How would you improve theaccuracyof the analysis, if necessary?
- Q It is of interest to decide if an analytical separation of themetal ions can be effected by selective precipitation of carbonatesfrom a solution that is 9.84×10-2 M in Fe2+ and...
- Q A sample of solid CaCO3 is added to an empty reaction vessel,which is then sealed. After awhile, the following reaction reachesa state of dynamic equilibrium.CaCO3(s)---------> CaO(s) + CO2(g), ï„H =...
- Q Which solution should be mixed with 50.0 mL of 0.100M ammonia,(NH3), to makean effective buffer?Select one:a. 50.0 mL of 0.200 M HClb. 25.0 mL of 0.200 M HClc. 50.0 mL...
- Q How much 10.0 M HNO3 must be added to 1.00 L of a buffer that is0.0100 M acetic acid and 0.100 M sodium acetate to reduce the pH to5.00? (pKa...
- Q The energy efficency ratio of a refrigerator that consumes 1800W of electricty to remove 12,000 BTU/h of heat does not exceed 3.5.True or False?
- Q Please explain all answers1) Phenol was the first antiseptic. It has the chemicalcomposition 76.57% C, 6.43% H, 17.00% O. The molecular weight ofphenol was determined by mass spectroscopy to be...
- Q Balance the following reaction, which occurs inbasic solution.MnO4-(aq) + Br-(aq) -->MnO2(s) + BrO3-(aq)Please show your work.
- Q calculate the mass in grams of 7.88 mol of RbMnO4
- Q in a 1x10^-8 M solution of HNO3(aq) at 25C identify the relativemolar amounts of these species from least to mostOH- , H2O , HNO3 , H3O+ , NO3-
- Q Consider the Arrhenius equation.K= Ae-Ea/RTDiscuss the effect of changing the basicity of the nucleophilewould have on the activation energy, and therefore on the rateconstant. Describe the molecularity and rate law...
- Q The product of a Diels Alder reaction is often a pair ofenantiomers. Does the reaction of 9 10-dihydroanthracene-9 10-ab-succinic anhydride produce enantiomers? If yes, please draw eachenantiomer. If your answer...
- Q Methanol and ethanol are both oxidized by alcohol dehydrogenase(ADH). Methanol is poisonous because it is oxidized by ADH to formthe highly toxic compound formaldehyde. The adult body has 40 L...
- Q IF YOU COPY AND PASTE THE ANSWER FROM YAHOO ANSWERS, I WILL NOTRATE AND I WILL ALSO REPORT FOR NON-ORIGINAL WORK. Please stop copyand pasting Yahoo! Answers, it is wrong,...
- Q What is the pH of 1.000 L of a solution of 100.0 g of glutamicacid (C5H9NO4, a diprotic acid; K1 = 8.5 ×10−5, K2 = 3.39 × 10−10) to which...
- Q Draw and name the ten seven-carbon long chains for octyne(C8H14). Hint: each isomer will have a singlemethyl substituent. (Place a star next to each chiral carbon)
- Q The following reaction is similar to the breathing cycle ofplants:4KO2(s)  + 2CO2 (g)  ®2K2CO3 (s) + 3O2 (g)Calculate change inH for the above reaction from the followingdata:change in H (kcal)K(s)  ...
- Q Construct molecular orbital diagrams for S2, S2+ and S2-
- Q Classify the following ionic compounds according to theSigma-Aldrich solubility scale based on their molar solubility(S).Answer choices are: Very Soluble, Freely Soluble, Soluble,Sparingly Soluble, Slightly Soluble, Very Slightly Soluble, andPractically Insoluble.a)...
- Q Calculate the pH of the solution that results from mixing 35.0mL of 0.18 M formic acid and 70.0 mL of 0.090 M sodium hydroxide. (value for formic acid is 1.8*10-4.)
- Q Sodium carbonate (1.3579 g) was dissolved in deionized water togive a solution with a total volume of 100.0 mL. What was the pH ofthe resulting solution?
- Q 1.) Explain the following observations in terms of shiftingequilibria by Le Chatelier's Principle. Write the equation for theequilibrium involved in each case.a.) barium chromate, BaCrO4, is insoluble in basic solution...
- Q An aluminum rod is subject to electrolysis in an aqueoussolution resulting in the production of Al2O3at the _______________ and H2 gas at the _______________.a. Give the balanced anode and cathode...
- Q Part AHow long does it take a person at rest to breathe one mole ofair if the person breathes 84.0 mL/s of air that is measured at 25∘C and 755...
- Q Determine the Kanfor a .035 M weak (monoprotic) acid with a phof 3.5. Show work too please?
- Q The pKa of the α-carboxyl group of phenylalanine is 1.83, andthe pKa of its α-amino group is 9.13. Calculate the average netcharge on phenylalanine if it is in a solution...
- Q A.) what is the normality of Na2C2O4 solution if you use 1.14gof Na2C2O4 to prepare 100.00 mL of solution?B.) what is the normality of the stock KMnO4 solution if it...
- Q -Please Check my calculations-Mass Data for preparation of AlumMass Weighing paper: 0.3832 gramsMass Weighing paper plus Aluminum: 1.3838 gramsMass of watch glass: 56.5001 gramsMass of watch glass plus dry alum:...
- Q Methanol and ethanol are both oxidized by alcohol dehydrogenase(ADH). Methanol is poisonous because it is oxidized by ADH to formthe highly toxic compound formaldehyde. The adult body has 40 L...
- Q What is the concentration of a NH3 solution having apH of 11.15?
- Q Be sure to answer all parts.Find the pH during the titration of 20.00 mL of 0.1000 Mtriethylamine, (CH3CH2)3N(Kb = 5.2×10−4),with 0.1000 M HCl solution after the followingadditions of titrant.(a) 10.00...
- Q how to make a mole fraction of 0.25, 0.50, 0.75 ethylacetate and cyclohexane having a total volume of 5 or 10 ml
- Q Calculate the change in entropy when 108 ml of hot (97 oC) wateradded to 36 ml cold (5 oC) water in a closed Styrofoam cup giventhat Cp (H2O, l) =...
- Q calculate the formula mass of each compound givenbelow. keep at least one decimal place in atomic masses from theperiodic table. a) hydrogen peroxide, H2O2. b) sulfuric acid,H2SO4.
- Q Given:Ka1= 7.5*10^-3Ka2=6.2*10^-8Ka3=4.2*10^-13What is the pH of a solution of 0.550 M K2HPO4,potassium hydrogen phosphate?What is the pH of a solution of 0.400 M KH2PO4,potassium dihydrogen phosphate?
- Q Hi, I am doing an experiment that is called NaBH4 reduction ofacetophenone. I am having trouble understand the techinque/wordingwhen using a sep funnel. These are some of the proceduresbelow:1. Pour...
- Q .
- Q 200. g of liquid phase octane (C8H18) are burned in air at atemperature of 100. degrees Celsius and a pressure of 1.00 atm,forming vapor phase water and carbon dioxide.a) Write...
- Q Under what geochemical conditions is uranium soluble in water asan ion with 6+ charge? [Select ALL answers that apply]Oxidizing and strongly acidic.Reducing and strongly acidic.Oxidizing and strongly basic.Reducing with neutral...
- Q Two enterprising chemistry students decide to develop analternative to Alka-Seltzer tablets, replacing the aspirin(acetylsalicylic acid) with vitamin c (ascorbic acid). Thefollowing table shows one of the formulations they tried for...
- Q One kmol of gaseous octane (C8H18) is ignited withstoichiometric amount of dry air in a closed, rigid vessel. Thepressure of the reactants is 1 atm and the temperature is 25ï‚°C;while...
- Q Using data found in Appendix E of your textbook calculate thenonstandard emf for each of the following reactions if theconcentration of each of the ions in these reactions is 0.0006molar...
- Q Consider the reaction between oxalate ion and permanganate ionin acidic solution: ???4 − (??) + ?2?4 2−(??) → ??2+(??) + ??2(?)a. Balance the reaction in acidic solutionb. Determine the standard...
- Q Write net Bronsted equations and determine the equilibriumconstants for the acid-base reactions that occur when aqueoussolutions of the following are mixed. Instructions: Enter allsubstances in the order listed at the...
- Q A 39.7g piece of copper rod is heated to 98 degrees celsius andthen placed in an insulated container containing 50.7 grams ofwater at 18.3 degrees celsius. Assuming no loss of...
- Q A 100.0 mL solution containing 0.753 g of maleic acid (MW =116.072 g/mol) is titrated with 0.259 M KOH. Calculate the pH ofthe solution after the addition of 50.0 mL...
- Q Identify which component of the equilibriumreaction was added↑ or removed↓as a result of the applied stress.CH3COOH (aq) + H2O(l) ⇆ H3O+ (aq) + CH3COO- (aq)after added methyl orange (as indicator),...
- Q Describe how the solutions used in standard calibration curvesdiffer from those used in a standard addition curve?Describe how the concentration of an unknown analyte is foundfrom a standard addition curve?Why...
- Q If the Ka of a monoprotic weak acid is 2.1 × 10-6, what is thepH of a 0.43 M solution of this acid?
- Q Compare molecular orbital theory and ligand field theory for theconstruction of energy levels of metal complexes.
- Q Briefly explain how we arrive at the formula 3N-6 forcalculating the number of vibrational modes for a non-linearmolecule. Why is the formula 3N-5 for linear molecules? (Be sure totalk about...
- Q After a piece a potato being soaked and 20% NaCl with the mass behigher or lower and why?It's a piece a potato was soaked and 9% NaCl would the mass...
- Q When issued a sample of homogenized mixture of sugar and salt,determine the %- composition of the mixture by means ofconductivity measurements.Describe all necessary steps and pertinent details of the workto...
- Q Compound X, isolated from lanolin (sheep's wool fat), has thepungent aroma of dirty sweatsocks. A careful analysis showed thatcompound X contains 62% carbon and 10.4% hydrogen. No nitrogen orhalogen was...
- Q Explain the use of certain calcium compounds in the constructionindustry as mortar and plaster of paris. Make sure you name thecorresponding minerals that these two products are based on
- Q why is the lattice energy of potassium bromide moreexothermic than the lattice energy of rubidium iodide in 510words
- Q A 300.0 mL buffer solution is 0.220 M in acetic acidand 0.220 M in sodium acetate.What is the initial pH of this solution?What is the pH after addition of 0.0100...
- Q TYPED RESPONSE ONLYChoose a metal to describe in depth; do not choose a nonmetalalready selected by another student. Include information on itsdiscovery, history, abundance, physical and chemical properties,and uses or...
- Q I cannot figure out this problem, I've made a few attempts atsolving it. I could really use some help. The question is : 75.00mL of 0.225 M HNO2 is titrated...
- Q Calculate the enthalpy change for:C2H4 (g) + H2 (g) ---> C6H6 (l)given the following:C2H4 (g) + 3O2 (g) ---> 2CO2 (g) + 2H2O(l)deltaH= -845.2kJ2H2(g) + O2 (g) ---> 2H2O(l)deltaH= -573.2kJ2C2H6(l)...
- Q Explain in detail how coupled enzyme assay works
- Q Inthe experiment of Diels-Alder Reaction of Cyclopentadiene withMaleic Anhydride 0.1039 g of maleic acid, 0.40 mL of ethyl acetate,0.40 mL of ligroin, and 0.10 mL of cyclopentadiene were used. Thefinal...
- Q Sketch potential energy curves for the ground and excited statesshowing events leading to phosphoresce. Use arrows to label allnecessary transitions and answer the following:A) Based on your picture does phosphoresce...
- Q a 100ml sample of .20M HF is titrated with .10M KOH. determinePh of solution after addition of 100ml of KOH.Ka is 3.5x10-4.
- Q When 24.0 mL of 0.600 M H2SO4 is added to 24.0 mL of 1.20 M KOHin a coffee-cup calorimeter at 23.50°C, the temperature rises to30.17°C. Calculate H of this reaction...
- Q Can someone please explain the acid cleavage reaction in detail?I know it's SN2 if its a primary or secondary, and the lesshindered carbon is attacked. I know SN1 occurs if...
- Q When grape juice is fermented, glucose (C6H12O6) is converted toethanol (C2H6O) and carbon dioxide. Please show work.a.) Write a balanced chemical equation for the reaction. (Thereare not any other reactants...
- Q Using Silica or Alumina in packing the column results in“Normal†chromatography. What is reversed-phase chromatography andwhy is it useful?
- Q Calculate the pH in the titration of 20 mL of 0.125 M HCL with0.250 M NaOH solution after adding 9.60 mL and 10.40 mL of NaOH
- Q Calculate the percentage composition, by weight, in terms of theconstituent oxides of the following minerals. Constituent oxidesare SiO2, Al2O3, TiO2, FeO, MgO, Na2O, K2O, CaO, H2O, etc. Also,write a balanced...
- Q The diffusion coefficients for species A in metal B are given attwo temperatures: T (°C) D (m2/s) 1040 6.22 × 10-17 1280 6.11×10-16 (a) Determine the value of the activation...
- Q In a titration of a 250mL solution of 0.05M ammonia (NH3)(Kb=1.8 * 10^-5) with a concentrated (0.2M) solution of HCL,calculate the following:1. What is the initial pH before adding HCL?2....
- Q An enzymatic reaction takes place in a 10 ml solution that has atotal citrate (plus citric acid) concentration of 120 mM and aninitial pH of 7.00. During the reaction 0.2...
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