Chemistry question and answers for July 24, 2023
- Q A student reacts 81g of salicylic acid with 14 mL of aceticanhydride producing 2g of acetyl salicylic acid. What is thepercent yield of the reaction?
- Q A battery is constructed from these two half reactions:           i.  VO2+  +  2H+ + e-  → V3+  +H2O       Eo = 0.337 V vs SHE           ii.  TiF62 ̶  +  4 e-  →  Ti(s) + 6F...
- Q Determine the pH of each solution.Dissociation Constants at 25 ∘CNameFormulaKaFormic acidHCHO21.8×10−4NameFormulaKbMethylamineCH3NH24.4×10−4a) 0.21 M KCHO2b) 0.21 M CH3NH3Ic)0.21 M KI
- Q What mass of ammonium chloride should be added to 2.50 L of a0.145 M NH3 in order to obtain a buffer with a pH of 9.65?
- Q Q: Discuss why matrix effects canbe important in AAS.Q: How can I determine if matrix effects were significant ina sample (let say a tap water).
- Q how many ml each are needed to make a buffer with 0.12 MHC3H5O3- (KA=1.4 *10^-4) AND 0.15 NaC3H5O3 that has a pH=3.77
- Q The osmotic pressure of a solution containing 2.16 g of anunknown compound dissolved in 175.0 mL of solution at 25 ºC is 2.65atm. The combustion of 25.05 g of the...
- Q Write a balanced equation for the oxidation of methanol withKMnO4 in acidic solution; show how you balanced thereaction using half-reactions.
- Q SHOW ALL WORK1) The air pollutant NO is produced in automobile engines fromthe high-temperature reaction, N2 (g) + O2 (g) ⇌ 2 NO (g); Kc = 1.7× 10-3 at 2300K...
- Q The Ka of a monoprotic weak acid is 4.40 × 10-3. What is thepercent ionization of a 0.185 M solution of this acid?
- Q Is sodium hypochlorite insoluble or soluble?
- Q For the following reaction, Kc = 255 at 1000 K.CO(g)+Cl2(g)⇌COCl2(g) A reaction mixture initially contains a COconcentration of 0.1490 M and a Cl2concentration of 0.180 M at 1000K.a) What is...
- Q How do pH and Kf affect the end point of an EDTAtitration?
- Q Find the pH during the titration of 20.00 mL of 0.1820 M nitrousacid, HNO2 (Ka = 7.1 ✕ 10-4), with 0.1820 M NaOH solution after thefollowing additions of titrant. (a)...
- Q If the rate law for the clock reaction is: Rate = k [ I-] [ BrO3-] [H+] A clock reaction is run with the following initialconcentrations: [I-] [BrO3-] [H+] [S2O32-]...
- Q Calculate the pH in 0.050 M sodium benzoate; Ka forbenzoic acid (C6H5CO2H) is 6.5×10−5.
- Q MODULE 5: ASSIGNMENT ENVM 590: AIR POLLUTION CONTROL. Module 5:Particulate Control 1. For a given dust loading initially and twoidentical collectors in series, why is the overall collectionefficiency for the...
- Q Consider the titration of 40.0 mL of 0.0600 M(CH3)2NH (a weak base; Kb =0.000540) with 0.100 M HClO4. Calculate the pH after thefollowing volumes of titrant have been added:(a) 0.0...
- Q What is the net ionic equation of NaCl+Ag2SO4 --->Na2SO4+AgCl
- Q Einstein did not try to reconcile the wave and particle theoriesof light, and did not say much about their apparent inconsistency.Einstein basically visualized a beam of light as a stream...
- Q 2) Indicate the structural change and reaction that occurred toproduce each positive test a. Bromine Unsatuation b. BaeyerUnsaturation c. Chromic Acid d. Tollen’s e. Iodoform
- Q 1. A 15.00 gram sample of ammonium chloride was dissolved in100.00 grams of water. How much heat is produced by the dissolution(absorbed from the solution) if the solution temperature goes...
- Q You run an ion exchange column, eluting your protein with a highNaCl buffer. Would you be able to run a size exclusion columnimmediately after the IEX column or would you...
- Q HClO is a weak acid (Ka = 4.0 × 10–8) and so the salt NaClO actsas a weak base. What is the pH of a solution that is 0.026 M...
- Q 1. Provide a scenerio in which a molecule with two strong bonddipoles can have no molecular dipole at all? Explain your answerwith a drawing showing individual bond dipoles and the...
- Q Use the data from the most concentrated solution of acetic acidto calculate the Ka value for acetic acid. Clearly show all of yourwork below. mot concentrated solution of acetic acid...
- Q An electrochemical battery is used to provide 1 milliwatt (mW)of power for a (small) light. The chemical reaction in the batteryis: 1/2 N2 (g) + 3/2 H2 (g) → NH3...
- Q NH3 is a weak base (Kb = 1.8 × 10–5) and so the salt NH4Cl actsas a weak acid. What is the pH of a solution that is 0.040 M...
- Q In polymer chemistry, Suppose we have two polypropylenesamples.  One is atactic and one is isotactic.a) Explain the microstructural difference between the two;b) Would you expect the atactic sample to be stronger,...
- Q for the first part of the experiment, in which you are varyingthe amount of tyrosinase, how many millimeters of 15mM L-DOPA willbe in each tube?
- Q Determine the Theorethical Oxygen Demand(ThOD) for sewagecontaining 150 mg/L of CH2(NH2)COOH and 40mg/L of NH3.Find,(1) mg/L of oxygen for both carbon and nitrogen compounds(2) grams of oxygen per gram of...
- Q What volume (to the nearest 0.1 mL) of 6.00-M NaOH must be addedto 0.400 L of 0.250-M HNO2 to prepare a pH = 4.30buffer?What volume (to the nearest 0.1 mL)...
- Q A chemist at a pharmaceutical company is measuring equilibriumconstants for reactions in which drug candidate molecules bind to aprotein involved in cancer. The drug molecules bind the protein ina 1:1...
- Q 1. Find the MSDS for potassium chlorate. a) Are there any healthhazards associated with this material, and what conditions producethese hazards?b) Under what conditions does it produce fire or explosionhazards?c)...
- Q Please Explain! Thank you so much.An aqueous solution of ethyl acetate at room temperature has anitial concentration of 0.15 M. Calculate the equilibriumconcentrations of ethyl acetate (CH3COOC2H5), ethanol (C2H5OH) andacetic...
- Q Summarize IR Spectroscopy and what are real-life analogies to IRspectroscopy?
- Q Calculate the pH at the equivalence point for titrating 0.160M solutions of each of the following bases with 0.160MHBr.- hydroxylamine (NH2OH)- aniline (C6H5NH2)
- Q calculate the cost/gram of crude and recrystallized product forthe reaction given the following: salycylamide ($0.38/g); NaI($0.78/G); 6% (W/V) NaOCl ($1.34/l); sodium thiosulfate ($10.16/L);ethanol (absolute and 95%) ($11.17/L).You can ignore the...
- Q 1.Acids commonly dissociate to give hydrogen ions insolution(H+), while bases dissociate to give hydroxide ions in solution(OH-). Why is it important to know the difference between acids andbases, in terms...
- Q 1. Assume that the rate law for a reaction is rate =k[A][B]^2a) what is the overall order of the reaction?b) if the concentration of both A and B are doubled,...
- Q A mixture is made by combining 11.5 mL of 8.5×10−3 M KSCN, 6.3mL of 3.7×10−2 M Fe(NO3)3, and 10.4 mL of 0.397 M HNO3. Calculatethe concentraion of Fe3+ in the...
- Q Given a solution of 0.125 M CH3COOH (aq) anda solution of 0.150 M NaCH3COO (aq), how wouldyou prepare 100.0 mL of a buffer solution with a pH of 4.400?pKa =...
- Q What is the change in pH when 10.0 mL of 0.250 M KOH(aq) is added to 100.0 mL of a buffer that is 0.150 M inHCOOH (aq) and 0.100 M...
- Q Calculate the pH of 6.6 × 10-8 M HCl. Report your answer to thehundredths place.
- Q Given the following pairs ofhalf-reactions, please construct a complete balancedoxidation-reduction reaction for each pair of twohalf-reactions:a) H2= 2H+ +2e-Fe2+= à Fe3+ +e-b) 1/4O2(g) + H++ e- == ½ H2OH2 =à ...
- Q Based on material science and diffusion, how is beef marinated?This question was given by my professor as a way to apply diffusionto the real world and if you can give...
- Q In a experiment, 1 ml of .01 M KMnO4 plus 6 drops of 6 M H2SO4are added together with drops of 0.1 M FeSO4 until change occurs.The color changed from...
- Q Given the E0 values of the following twohalf-reactions:Zn à Zn2+ +2e-              E0 = 0.763 voltFe à Fe2+ +2e-               E0 = 0.441 volta)Write a balanced completeoxidation-reduction reaction?b)Explain whether the corrosion ofan iron pipe...
- Q calculate the molar solubility of of Ag2CO3 in asolution that is buffered to a phone of 7.50
- Q Physical Chemistry problem:How does the confinement of a particle to a finite region ofspace lead to the quantization of its energy? You may use anycombination of words, images, or equations...
- Q Determine the pH at the equivalence point when 0.05 M KOH istitrated with 50.0 ml of 0.01 M benzoic acidHC7H5O2. The Ka forbenzoic acid is 6.3 x10-5.
- Q You have 200 ml of 0.1M HEPES buffer, pH 7.5. You add 2 ml of0.4M HCl. The pKa of HEPES is 7.5.a) what will the resulting pH be?b) what would...
- Q A mixture of carbon dioxide andnitrogen gases, in a 7.69 L flaskat 36 °C, contains 10.4 grams ofcarbon dioxide and 7.77 grams ofnitrogen. The partial pressureofnitrogen in the flask is...
- Q Calculate the pH of each of the solutions and the change in pHto 0.01 pH units caused by adding 10.0 mL of 3.63-M HCl to 440. mLof each of the...
- Q State the dominant intermolecular forces for the followingsubstances:iron(III)chloridephosphorous trichlorideboron trichlorideBeH2H2OXeF2PH3CrCl3SF2CS2
- Q Calculate the change in pH to 0.01 pH units caused by adding 10.mL of 3.69-M NaOH is added to 530. mL of each of the followingsolutions.a.) waterpH before mixing: 7.00...
- Q please can answer all the questions and with work clearly1. According to the Joslin Clinic, healthy individuals withoutdiabetes should have a blood glucose level of no more than 100 mgdL−1...
- Q Thermodynamics assumes that matter is in its equilibrium statein order to make its calculations. Please, indicate whether or notthe systems below may or may have not achieved an equilibrium stateand...
- Q Fermentation Test – if we sketch the fermentation tube, what arethe expected results?Hydrolysis of di- and polysaccharides – can disaccharides andpolysaccharides undergo hydrolysis? (YES!!) How did the tests youconducted support...
- Q A reaction was run with two different initial concentrations ofreactants A and B:ExperimentA / MB / MrateB / (M/sec)10.000220.000460.084120.000220.001660.3035What is the order of the reaction with respect to B?A reaction...
- Q Carbohydrates:what is the difference in monosacchrides, disaccharides, andpolysacchrides?What are the structures of glucose, frustose, sucrose, lactose,and starch, such that you could predict their responses in thefollowing tests:Benedicts test (remains bright...
- Q Functional Group Identification:What are the functional groups (alkanes, alkenes, alcohols,aldehydes, ketones, phenol)?how is reaction with Br2: (and how this can be used to test foralkanes, alkenes with and without light)Explain...
- Q For the standardization of their sodium hydroxide solution apair of students weighed out 0.4607 g of KHP (MM 204.22 g/mol).They found that it took 20.26 mL of their NaOH solution...
- Q If a temperature increase from 19.0 ∘C to 37.0 ∘C triples therate constant for a reaction, what is the value of the activationbarrier for the reaction?
- Q A sample containing acetaminophen was dissolved in water to makea 50.00-mL solution. The solution was titrated with 0.5065 M NaOH,and the equivalence point was reached when 26.10 mL NaOH solutionwas...
- Q Polymers:What is the difference between monomers and polymers, basicunderstanding of a polymerization?what is the synthesis and characterization of nylon, gluep, andslime?How to use a table of types of plastics, their...
- Q Consider the reaction:2 NO2 (g) ⇌ N2O4 (g)The ΔGf° for NO2 (g) = 52 kJ/mol and forN2O4 (g) = 98 kJ/mol at 298 K.Calculate the ΔG at the following values.0.8...
- Q Find the Percentage yield of [1,3,5-C6H3(CH3)3]Mo(CO)3and discussion of factors responsible for the lowyield?Procedure: 0.5 g (~ 1.9 mmol) of Mo(CO)6 was added with 5mL(~36mmol) of mesitylene.  The apparatus is assembled inthe...
- Q In The first order reaction A -> products, [A] = .400 Minitally and .250 M after 15 min, what will [A] be after 175min?
- Q Calculate the concentration in osmolarity of a solution preparedby adding 5.00 g NaCl (molar mass = 58.44) to a 100 mL volumetricflask, filling the flask to the mark with distilled...
- Q A 26.1 mL sample of 0.316 Methylamine,C2H5NH2, istitrated with 0.249 M hydroiodicacid.After adding 12.4 mL of hydroiodicacid, the pH is______ .B.A 21.5 mL sample of 0.261 Methylamine,C2H5NH2, istitrated with 0.210...
- Q I remember from class that a –OH group is a bad leavinggroup. How is it that this reaction will progress when bad leavinggroups do not favor substitution reactions? (A partial...
- Q calculate the pH of a 4.20x10^-8 M solution of HBr withwater
- Q Assume that the co-polymer is a1:1 mixture of styrene and maleic anhyride and draw the structureof the repeating monomer unit. Calculate the percent yield basedupon the amount of maleic anhydride...
- Q 1. Which, if any, of the molecules in Exercise 1 had resonancestructures? How many resonance structures did each molecule have?2. Both chlorine and fluorine are represented by a green modelingpiece...
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