Chemistry question and answers for September 13, 2023
- Q Calculate the molar solubility in pure water for the followingcompound at 25°C, Ag2SO3 Ksp =1.5x10-14What is the molar solubility in 0.0010 M sodiumsulfite? Â
- Q The concept of energy charge is a very useful way to think abouthow ATP levels control pathway activity. Discuss the role of ATP inthe glycolytic pathway (between glucose and pyruvate...
- Q The details of several steps in the particle-in a box middle inthis chapter have been omitted. Work out the details of thefollowing steps:a.)Show that if Ψ =A sin rx +...
- Q Organic Chemistry II: Please read the whole question andthen answer with details and clear typing. NO HAND-WRITYNGPLEASE.Not too long ago \"free radicals\" and quenching those \"freeradicals\" was a big marketing...
- Q write balanced, complete ionic and net ionic equationsfor each reaction a) hcl + LiOH_H2O + LiCl b) MgS + CuCl_ CuS +MgCl c) NaOH + HNO_ H2O + NaNo d)...
- Q A reaction proceeds by the following single-step mechanism: A →2B + Cand the Arrhenius expression for the rate coefficient is k =(2.58x107 s−1) exp [−(34.25 kJ mol−1)/RT]If the initial pressure...
- Q 1. a. Number of unpaired electrons in a Co3+tetrahedral complex, if it has weak field ligands?b. Number of unpaired electrons in a Co3+ octahedralcomplex, if it has strong field ligands?c....
- Q 19.51 Find the pH during the titration of 20.00 mL of 0.1000 Mbutanoic acid, CH3CH2CH2COOH (Ka = 1.54×10−5), with 0.1000 M NaOHsolution after the following additions of titrant:(a) 0 mL...
- Q 1) Why are alkynes considered acidic and then also consideredgood nucleophiles?…Aren't bases good nucleophiles?…†(Note: Explainthe acidic nature of alkynes and how they can be converted to goodnucleophiles. )2) Explain...
- Q When air (21 mol% O2, 79 mol% N2) is placed in contact with 1000cm3 of liquid water at body temperature, 37°C, and 1 atm absolute,approximately 14.1 standard cubic centimeters [cm3(STP)]...
- Q Which has the smallest Zeff for its valence electrons?A) FB) ClC) BrD) IE) A-D all have the same Zeff
- Q What is the energy per mole of photons of light with awavelength of 812.4 nm? a.) 2.45 x 10^-19 KJ/mol b.) 1.47 x 10^2KJ/mol c.)4.89 x 10^14 KJ/mol d.) 2.22...
- Q reagentMolecular WeightGrammmolequivalentsdmLhydroquinone1101.0xxxxxxxacetic anhydride10213.11.08phosphoric acid981.850.05THEORETICAL PRODUCTXXXXXXXXXXXXXXXXXXXXXXXXXXxxxxxXX4-(acetyloxy) phenylacetatexxxxxxxxxxxxxxxxxxacetic acidxxxxxxxxxx1.049Please show step by step solution. Thanks!
- Q 1)Using average bond enthalpies, predict which of the followingreactions will be most exothermic:a) C(g) + 2 F2(g)b) CO(g) +3 F2(g) CF4(g) + OF2(g)c) CO2(g) + 4 F2(g) CF4(g) + 2...
- Q Titrate 100.0mL of 0.0500M Fe2+ with 0.100M Ce4+. Theequivalence point is when volume of Ce4+ added is 50.0mL. Find thevoltage of the cell at the following points: a. 20.0mL b....
- Q The automobile fuel called E85 consists of 85% ethanol and 15%gasoline. E85 can be used in so-called flex-fuel vehicles (FFVs),which can use gasoline, ethanol, or a mix as fuels. Assume...
- Q (A) The volume of water needed to dissolve0.0510 grams of magnesiumfluoride is ____Â Â L.Assume no volume change upon addition of the solid.(B) A 16.3 mL sample of a0.494 M aqueous nitrous...
- Q Determine the Ka of an acid whose 0.364M solution has a pH of1.80.
- Q A buffered solution contains 0.25 M NH3 (Kb = 1.8 x 10-5 ) and0.40 M NH4Cl.a. Calculate the pH of this solution.b. Calculate the pH of the solution that results...
- Q Here are four problems (5 pts each) involving the calculation ofDG°' for metabolic reactions we have discussed, based onexperimentally determined redox potentials. Calculate theDG°' for each reaction using the equation...
- Q 1) Succinyl-CoA inhibits both citrate synthase andα-ketoglutarate dehydrogenase. How is succinyl-CoA able to inhibitboth enzymes?
- Q A. Calculate the pH of a solution formed by combining 0.125 mLof 0.55 M HI with 0.400 mL of 0.14 M KOH at25°C.B. Calculate the pH of a solution formed...
- Q Assume for the moment that air consists of 80.00% nitrogen (N2)and 20.00% oxygen (O2) by volume. Use these figures and typicalvalues for temperature and pressure (1.000atm and 25.00°C) tocalculate the...
- Q Polystyrene has a statistical segment length of 0.67 nm in themelt and a density of 1.05 g/cm**3.*find the molecular weight of repeated unit* Find the characterstic ratio C∞for polystyrene using...
- Q Consider a glass electrode or [pH electrode (combinationelectrode). a. Identify the reference part. b. Identify theindicator part. c. Explain how the potential of the electrode isdetermined. d. Describe a two-point...
- Q Here are four problems (5 pts each) involving the calculation ofDG°' for metabolic reactions we have discussed, based onexperimentally determined redox potentials. Calculate theDG°' for each reaction using the equation...
- Q How much heat energy is required to convert 82.2 g of solidethanol at -114.5 °C to gasesous ethanol at 129.6 °C? The molarheat of fusion of ethanol is 4.60 kJ/mol...
- Q Use the particle in a box model to estimate the energies of thefirst electronicallyexcited states of ethylene, butadiene andhexatriene. Use a table of bond lengths to estimate the length ofthe...
- Q Scientists at the University of Massachusetts at Amherst haveused a bacterial organism, known as Geobacter species, in a fuelcell to generate electricity. Describe, in detail, the principleand process of electrical...
- Q Consider the reaction below.If you start with 0.39 moles of C 3H 8(propane) and 7.0 moles of O 2, what is the percentyield if 0.51 moles of carbon dioxide is...
- Q The following data was taken in a GC experiment: tr of air (nonretained) = 33s, tr of benzene = 275s, tr of toluene = 342s. Fromthe literature it is known...
- Q A compound with molecular mass = 292.16 g/mol was dissolved in a5.000 mL volumetric flask. A 1.000 mL aliquot was withdrawn, placedin a 10.000 mL flask and diluted to volume....
- Q 1) calculate the concentration of maleic acidsolution?given : 25.00 mL of maleic acid of unknown contration isdiluted with 50.00 mL of water. It is used to titrate 49.72mL of0.1 M...
- Q Design your own environmental laboratory experiment based onANY of the labs we completed during CE 4371. You will be gradedbased on:Developing your overarching experimental question/goal,How you appropriately select your experiments...
- Q 1. A 30 g piece of metal (160.9 g/mol) melts at1,560°C and its enthalpy of fusion is 12.6 kJ/mol. Calculate theentropy of fusion (J/k) per mole of the metal.2. The...
- Q Explain why atomic absorption spectroscopy and ionchromatographic (IC) technique are used as complementary techniquesfor water analysis.
- Q Describe at least one analytical technique that you could usethat is more sensitive than Raman spectroscopy, FTIR spectroscopy,and energy-dispersive X-ray spectroscopy (EDS) analyses, but thatmight be destructive in its analysis...
- Q Please fill in the rest of the table below. For theoreticalpotential, % error, cell reactions for cathode, anode and net, anddelta G in kJ.Table 1CellMeasured TotalPotential from Multimeter (V)1Individual Half-Cell...
- Q a compound with molecular formula c8h6o2 has an intense signalat 1696 cm-1 in its ir spectrum and only two signals in its 1H NMRspectrum (singlets at 10.14ppm and 8.05ppm). Draw...
- Q Rank these compounds from weakest base to strongest base.A)4-methylaniline B)aniline C)trifluoromethyl aniline
- Q For the following reaction, 46.0 grams ofiron are allowed to react with18.4 grams of oxygen gas .iron(s) +oxygen(g) --->iron(III) oxide(s)a. What is the maximum mass of iron(III) oxidethat can be...
- Q Draw the structure of protonated histidine and indicate (drawand name) all possible non bonding interactions with water. includeH bonding, and Hydration Spheres
- Q The solvent for an organic reaction is prepared by mixing 50.0of acetone () with 61.0 of ethyl acetate (). This mixture is storedat 25.0 . The vapor pressure and the...
- Q Cacodylic acid (dimethylarsinic acid, HAsO2(CH3)2) is a commonbuffer used in biology to prepare and fix biological samples. ThepKa of cacodylic acid is 6.3.Part A What is the pH of a...
- Q Explain the relationship between oxidation-reduction and voltaiccells. Your answer must include equations.
- Q Polychlorinated biphenyls (PCBs), which were formerly used inthe manufacture of electrical transformers, are environmental andhealth hazards. They break down very slowly in the environment. Thedecomposition of PCBs can be represented...
- Q Determine the pH of an HF solution of each of the followingconcentrations. (Ka for Hf is 6.8 x 10^-4. )A. 0.240MB. 0.0510MC. 0.0200M
- Q 1500 pound per hour of a waste mixture of 40% benzene,50% toluene and 10% of water is burned with 25% excessive air.Determine the total heat released and the percent by...
- Q A) A student measures the molar solubility of copper(II)hydroxide in a water solution to be3.49×10-7 M.  Based on her data, the solubility product constant for thiscompound is  .B) A student measures the...
- Q Suppose there are two known compounds containing the genericelements X and Y. You have a 1.00 g sample of each compound. Onesample contains 0.31 g of X and the other...
- Q If 2.000 g of hydrated magnesium chloride are heated to removethe water of hydration, the anhydrous salt that remains has a massof 0.9366 g. Determine the following:(A)The mass of water...
- Q For each of the following reactions, 25.0 g of each reactant ispresent initially.Determine the limitingreactant.2Al(s)+3Br2(g)→2AlBr3(s)Calculate the grams of product in parentheses that would beproduced.(AlBr3)Determine the limiting reactant.4NH3(g)+5O2(g)→4NO(g)+6H2O(g)Calculate the grams of...
- Q When the following reaction is balanced in basic solution usingthe lowest possible whole number coefficients, the coefficient ofOH- will be??CN-(aq) + MnO4-(aq) --> CNO-(aq) + MnO2(s)
- Q How can you combine standard addition and internal standardtechniques in an HPLC experiment?
- Q A 9.59 g sample of calcium sulfide was decomposed into itsconstituent elements, producing 5.33 g of calcium and 4.26 g ofsulfur. Which of the statements are consistent with the law...
- Q P4O10 is classified as an acidic oxide because itA. reacts with acids to produce a salt.B. is insoluble in water.C. reacts with water to produce OH– .D. gives a solution...
- Q Resonance results in a weaker base and a weaker nucleophile?
- Q Which one of these salts will form a basic solution ondissolving in water?A. NaClB. KCNC. NaNO3D. NH4NO3E. FeCl3
- Q suppose you had a mixture of silver iodide, potassiumnitrate, ethyl alcohol, and water. if you wanted to recover each ofthe compenents in pure form, which methods: decantation aftersedimentation, decantation after...
- Q Please, I need to get this right. No one is yet to get it right,it has been answered on Chegg but is wrongIn a psychrometric process, Volume of a classroom...
- Q Explain why temperature has an effect on reaction rate.Explain why concentration has an effect on reaction rate.
- Q The average human body contains 6.50 L of blood with a Fe2+concentration of 2.50×10^−5 M . If a person ingests 12.0 mL of 17.0mM NaCN, what percentage of iron(II) in...
- Q This experiment involves testing protein stability in a varietyof solutions. Describe the effect you suspect each will have on theprotein’s environment (ex: increases pH, competes for hydrogenbonds, increases hydrophobicity, etc.)...
- Q A typical aspirin tablet contains 319 mg acetylsalicylic acid.Calculate the pH of a solution that is prepared by dissolving twoaspirin tablets in enough water to make one cup (249 mL)...
- Q Why is AgNO3/ethanol especially suitable for comparing therelative reactivity of various alkyl halides toward SN1 reactions?Comment on the nature of the nucleophile, the nature of the solventand the ease with...
- Q an unkown hydrocarbon contain carbon hydrogen and oxygencombustion of 1.6 g of the hydrocarbon produces 1.0286 g h2o and3.7681 g co2. what is the empiral formula of this compound?
- Q Why was Cu prepared from a pure metal? Why was Ca prepared froma salt? Why is CaCO3 a better salt for this purpose thanCaCl2?
- Q A solution containing 87.32g of dissolved mercury (III) nitrateis mixed with a solution containing 34.62g of dissolved sodiumsulfate. A chemical reaction occurs, and a precipitate is produced.How many grams of...
- Q Urea,NH2CONH2, is manufactured from ammonia and carbon dioxideaccording to the following equation: 2 NH3(g) +CO2 (g)->NH2CONH2 (aq)+H2O (l)What volume of ammonia gas at 25 o C and 1.5 atm is...
- Q Use the equation 6KI + SHNO3 ----> 6KNO3 + 2NO + 3I2 + 4H2O.Note that 1 mole of any gas is measured at STP will occupy22.4L.a.) If 38g of KI...
- Q As a sample of what you know about equilibrium, select THREEitems from this list and discuss how each of them pertains toequilibrium: Colligative properties, Free Energy, Batteries,Temperature, pH.
- Q 1.What is the molality of a solution consisting of 1.34 mL ofCCl4 (D=1.59 g/mL) in 65.0 mL ofCH2Cl2 (D=1.33 g/mL).2. Calculate the molarity of 3.58 m aqueous RbCl solution with...
- Q 2) You have 25 ml of an ATP solution. You take 30 µl and diluteto a final volume of 10 ml. The absorbance of this solution is0.432. What is the...
- Q 5.00 moles ofN2 and 8.00 molesof H2 are placedin an empty container, the container is heated to 887 degreesCelsius, and a catalyst is added that catalyzes the rxn. of thesegases...
- Q A surface water sample of 50 ml was taken to determine theconcentration of an organic pollutant in the sample. An organicsolvent was used as extracting solvent. On analysis of both...
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