Chemistry question and answers for August 16, 2023
- Q Which of the following bonds would be the most polar? a. N--P b.N--Al c. N--Ga d. N--Si e. N--C
- Q What are two most well-known \"Bands\" in traditional or classic(inorganic) semiconductors? For most organic materials, scientiststypically do not use those \" Bands\" and instead using different butsimilar names, what are...
- Q 1. Determine the pH of the buffer solution that is prepared bymixing 259 mL of 0.0983 M BIS−TRIS propane−H (C11H27N2O6+ ) to 855mL of 0.0729 M BIS-TRIS_propane (C11H26N2O6) ). Assume...
- Q Calculate the pH of 0.036 M nitrous acid (HNO2) solution: answer is2.42. Please show all steps.
- Q What is the pH of a saturated strontium hydroxide solution?
- Q Find the pH of the following solutions: a mixture of 10.0 mLNaOH solution having pH 11.00 and 10.0 mL HClO4 having pH 1.00.2.) Using activities calcalute the pH and concentration...
- Q 1)A 55.67 g sample of a substance is initially at 22.7 °C. Afterabsorbing 2847 J of heat, the temperature of the substance is 132.2°C. What is the specific heat (c)...
- Q The Sun delivers roughly 1 kW m−2 of power to the Earth'ssurface. A parabolic mirror with a 1 m radius is used to focus thisenergy onto a beaker containing 1...
- Q All surface probe microscopy (SPM) techniques involve a probewhich interacts with a sample surface. Atomic Force Microscopy(AFM) and Scanning Transmission Microscopy (STM) are two SPMtechniques that operate on the basis...
- Q The pH gradient established by the electron transportchain in photosynthesis:a.) Â Exists between the matrix and themitochondrial intermembrane spaceb.) Â Sets up a voltage gradient that drives GTPformationc.) Â Is established by electron...
- Q The following data were obtained for the concentration vs. timefor a certain chemical reaction. Values were measured at 1.0 sintervals, beginning at 0.00 and ending at 20.0 s. Concentrationsin mM...
- Q Dark Blue: 9,10-DiphenylanthraceneLight Blue: PeryleneGreen: 9,10-Bis(phenylethynyl)anthraceneYellow: RubreneOrange: Rhodamine 6GThe fluorophore suspensions used listed above, I need to knowwhich dye should work the best, glow the brightest? I know thatconjugation of...
- Q Which ions are paramagnetic and which ions are diamagnetic.Please explain why each ion is either paramagnetic ordiamagnetic.
- Q Experiment 1: Gravimetric Analysis with Calcium Chloride andPotassium CarbonateIn this experiment, proper analytical experimental techniques willbe utilized to perform a double displacement reaction. A solutionwill be prepared containing a known...
- Q Let's use 32 as the number of ATP produced per glucose's aerobiccatabolism. (See the last sentence in the legend to Table 21.1 forthe rationale for this number.)Now, what would the...
- Q Define and write a sentence?What are the important mechanisms bywhich atoms are bonded?
- Q Complete this table of values for four aqueous solutions at25
- Q Describe three types of charge transfer transitions that arepossible in theromocromatic complexes
- Q What comments can you make regarding person's potential for good“long-term†health as it related to diet related diseases?
- Q Calculate amount of energy obtained PER WEIGHT (not permolecule) of glucose vs. palmitic acid. Show your calculations andthe units. Compare the two numbers and briefly discuss theirsignificance
- Q Crime scene investigators have determined that an acrylic spraypaint (polymethylmethacrylate, PMMA) was used to deface the MonaLisa. Leonardo used linseed oil. We would like a solvent thatinteracts more strongly with...
- Q lowering the pH of the solution inside the battery will: a. makeE larger than E b. make E smaller than E c. have no effect on E vs.E d. make...
- Q ionization energy is usually expressed in units of kj/ mole 1000j = 1 Kjuse the bohr equation to calculate the ionization energy ofhydrogen in K j/ mole ? show your...
- Q 2) True or False (If statement is false, correct it so that itis true) a) Polymers make up an exciting class of biomaterials.Polyethylene is a wonderful example of a simple...
- Q The triprotic acid H3A has ionization constants of Ka1 = 1.6×10–3, Ka2 = 2.4× 10–9, and Ka3 = 6.4× 10–11.Calculate the following values for a 0.0800 M solution ofNaH2A.[H+] =...
- Q A 130.0 mL sample of a solution that is 0.0126 M in NiCl2 ismixed with a 190.0 mL sample of a solution that is 0.400 M inNH3.-After the solution reachesequilibrium,...
- Q Use the Activity Series (Silberberg) to predict whether each ofthe following reactions will occur spontaneously (yes or no):a) Mn2+ (aq) + Co (s) --> Mn (s) + Co2+(aq)b) 3 Zn...
- Q ASAPWittig Reaction using 9-anhraldehyde and triphosphorane1. What is the isomer product? Why is it only produced in smallamounts2. Show the steps and mechanisms in which a ylide comes fromtriphosphorane.
- Q from an analysis of IR spectrum of dimedone , is it possible todetermine the keto/enol ratio? How can one do this ? Describe twoother methods to distinguish between the keto-and...
- Q Calculate the pH of the buffers prepared in the followingways:A. By mixing 50.00 mL of 0.200 M ammonium nitrate, NH4NO3, with25.00 mL 0.200 M NaOHB. By neutralizing half of the...
- Q What is the frequency of radiation whose wavelength is5.2×10−5 m ?Express your answer using two significant figures.ν =  s−1  SubmitMy AnswersGiveUpPart BWhat is the wavelength of radiation that has a frequency of2.8×108...
- Q My daily water/fliud intake is usually 6 cups of water, a cup oflemon juice and a small can of soft drink (cola). How does thiscompare with recommended values? What factors...
- Q Construct a Born-Haber cycle for the formation of thehypothetical compound NaCl2 where the sodium ion has a 2+ charge(the 1st and 2nd ionization energies for sodium are 496 KJ/mol and4562...
- Q The following reaction reaches equilibrium at 350 degree C and 2bar, with an equilibrium constant K = 3.7064 at these conditions: CH subscript 3 C H O space left parenthesis...
- Q Although the d electrons in manytransition metal compounds may not be involved directly in bondformation, they nevertheless exert a considerable influence onstructure. Explain.
- Q 1. Using your determined value of Ksp, calculate howmany milligrams of Ag2CrO4 will dissolve in10.0 mL of H2O.Ksp=8.26*10-11.2. Use your Ksp and show, by calculation, thatAg2CrO4 should precipitate when 5mL...
- Q Gaseous ammonia can be injected into the exhaust stream of acoal-burning power plant to reduce the pollutant NO to N2 accordingto the following reaction: 4NH3(g)+4NO(g)+O2(g)→4N2(g)+6H2O(g)Suppose that the exhaust stream of...
- Q The oxides MnO. FeO, CoO and NiO allhave the cubic rock salt structure with octahedral coordination ofthe cations. The structure of CuO is different and contains grosslydistorted CuO6 octahedra. Explain.
- Q Compound X, C8H17Cl, is achiral product of the radical chlorination of4-methylheptane.X reacts in SN2 fashion with NaI inacetone to form Z, C8H17I.When the reactant is the R-enantiomer of X, onlythe...
- Q 2. Phosphoric acid (H3PO4) is a triprotic acid with thefollowing pKa values: pKa1 = 2.15 pKa2 = 7.20 pKa3 = 12.35a). You wish to prepare a 1.000 L of a...
- Q Consider the titration of 65 mL of 1.75 M diethylamine,(CH3CH2)2NH (Kb = 1.3×10-3) with 0.25 M HCl. How many mL of HClwill need to be added to the diethylamine solution...
- Q What was the initial concentration of 100ml of KBr solution, ifafter adding water to dilute it, 300ml of a 4 percent solution wasobtained?
- Q A mixture containing 2.91 g each of CH4(g),C2H4(g) andC4H10(g) is contained in a 1.50 Lflask at a temperature of 35°C.(a) Calculate the partial pressure of each of the gases in...
- Q What are some of the problems associated with mining phosphaterock? I've read toxic elements like cadmium and I believe uraniumand selenium are found in phosphate rock deposits, but would likefor...
- Q 1. A 100-watt lightbulb radiates energy at a rate of 100 J/s(The watt, a unit of power, or energy over time, is defined as 1J/s). If all of the light...
- Q Use the Henderson–Hasselbalch equation to calculate the pH ofeach solution:Part Aa solution that is 0.135 M in HClO and 0.165 Min KClOExpress your answer using two decimal places.Part Ba solution...
- Q Suppose the 0.1 M Zn 2+ solution has been diluted (instead ofthe Cu 2+ solution), would the measured cell potentials haveincreased or decreased? Explain why the change occurred.
- Q Potassium dichromate (K2Cr2O7) is a bright orange salt that canbe converted to a blue-violet solution of Cr3+ ions. Under certainconditions, K2Cr2O7 reacts with ethanol (C2H5OH) to produce carbondioxide gas. The...
- Q Using the mechanism of hydroboration-oxidation as an example,explain what is meant by reterntion of configuration.
- Q what is the entropy of freshly shuffled deck of cards?(Physical chemistry)
- Q howwould you resolve the number of compounds in a mixture if the rfsof the spots under uv are 1.0, 0.52,0.0
- Q Howto find the diameter of a marble? Also convert it from liters tosomething cubed?
- Q 1. If the boiling point of (R,R)-1,2-diaminocyclohexaneis 110°C, what do you think the boiling point of(S,S)-1,2-diaminocyclohexane is?2. Based on measured roations, how can one predict how well oneseparated 1,2-diaminocyclohexane enantiomers?...
- Q access important values if needed for thisquestion.A piece of solid lead weighing38.4 g at a temperature of 315 °Cis placed in 384 g of liquid leadat a temperature of 372...
- Q LCAO: Determine which of the following statements are true of a2p atomic orbitalWhich of the following statements are true of a 2patomic orbital? You may find the Orbitron page for...
- Q After thoroughly reviewing the octet rule, respond to thefollowing: Discuss the octet rule and why there are exceptions tothe rule. Give examples of the rule and of exceptions written in250...
- Q Calculate the Molar solubility at 25 degrees clelcius of Cr(OH)3In:Water:1.50 M Cr(NO3)3:A solution buffered to 10.50:(please include all of the steps)
- Q Starting with 6.9 mL of acetic anhydride with a density of1.082, how many grams of acetylsalicylic acid (theoretical yield)can be made? Assume acetic anhydride is the limiting reagent and aone...
- Q HWW Item 810Part ATitanium reacts with iodine to form titanium(III)iodide,emitting heat.2Ti(s)+3I2(g)→2TiI3(s)ΔHorxn = -839 kJDetermine the masses of titanium and iodine that react if1.50×103 kJ of heat is emitted by thereaction.Express...
- Q Consider the reaction that results from the addition of 50.0 gof Zinc metal (Zn) to 60.0 g of hydrochloric acid (HCl)? Generate abalanced equation for this reaction and then answer...
- Q HEPES,2-[4-(2-hydroxyethyl)piperazin-1-yl]ethanesulfonicacid, is a diprotic acid often used tocreate buffers compatible with biological samples. A 10.0 mLsample of HEPES was titrated with0.100 M NaOH.a. To 2 places past the decimal point,...
- Q A voltaic cell employs the following redox reaction:2Fe3+(aq)+3Mg(s)→2Fe(s)+3Mg2+(aq) Calculate the cell potential at25 ∘C under each of the following conditions.A) [Fe3+]= 1.9×10−3 M ; [Mg2+]=2.80 MB) [Fe3+]= 2.80 M ;...
- Q Usea flow chart; outline a separation scheme for isolating caffeinefrom tea bags.( ISOLATION OF CAFFEINE FROM TEA BAG EXPERIMENT ) #organicchemistry
- Q Correct calculationA) How many moles of silver are in a 100. G sample?B) Isoquinoline has the molecular formula C9H7N. Its molar massin g/mol is:c) Given the combustion of propaneC3H8 +...
- Q What is the expected aromatichydrocarbon reactivity of these compounds and why ? (which is thefastest and which is the slowest and why?) a bromine solution inacetic acid was added to...
- Q Calculate the solubility of Mn(OH)2 in grams per liter whenbuffered at pH=7.0, 9.8, 11.8. Assume that buffer capacity is notexhausted.
- Q What is the basic structure of lecithins, and how do they workas emulsifiers, and in membranes?
- Q Determine the mass (in g) of sodium hydrogen phosphate(Na2HPO4) that must be added to 87.8 mL of0.0264 M sodium dihydrogen phosphate to yield a pH of 7.78. Reportyour answer to...
- Q hemistry 1215, Experiment #12; Determination of the AtomicWeight of an Unknown Metal, Post-lab Name____________________________________ 1. A student who was measuringthe atomic weight of a metal failed to thoroughly clean her...
- Q In the second row of the transition metals there are fiveelements that do not follow the normal orbital filling. Five - Nb,Mo, Ru, Rh, and Ag-result in a[Kr]5s14dx configuration and...
- Q synthesize 3-benzyl-2-phenylhexanal using an aldolcondensation followed by conjugate addition of a gilmanreagent
- Q TRUE or FALSE? Please explain each answer!a) The more negative the ∆H value of a reaction the faster itis.b) The more negative the ∆G value of a reaction the faster...
- Q How much heat (in kJ) is required to warm 13.0 g of ice,initially at -13.0 ∘C, to steam at 113.0 ∘C? The heat capacity ofice is 2.09 J/g⋅∘C and that...
- Q If a cell with a resting membrane potential of -70 mV is treatedso that the resting membrane potential is at the equilibriumpotential of K+, and then the permeability of the...
- Q Question 5a) How many mL of 0.1 M CH3COONa must you add to 35.0 mL of 0.50M CH3COOH to make a buffer of pH 4.7? [pKa of H3COONa is 4.75]b)...
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