Chemistry question and answers for August 18, 2023
- Q The alkalinity of natural waters is usually controlled by OH- ,CO3 2- , and HCO3 - , which may be present alone or in combination.Titrating a 100.0 mL sample to...
- Q Describe the biochemical mechanism of kidney damage ofuntreated diabetic people
- Q The total mass of DNA in the body is 50.0 g. If the number ofnucleotides in ONE STRAND of DNA is approximately 3.0 x106 , and the average length of...
- Q Find the fraction of dissociation, α of an aqueous 0.400Mtriethylamine [(CH2CH3)N] solution.
- Q A sample of metal with a mass of 350 g is heated to 100 degreescelcius and dropped into 400 g of water at 21.4 degrees celcius.The temp of the water...
- Q What are the major developments in Novel hybrid inorganic -organic polymer systems in the last 10 years?
- Q Describe how the ionization energies of main group elements varyacross a period in the periodic table, using a diagram ifnecessary.a, Write the equation for the first ionization of potassium
- Q A) Â Â When 155 mL of water at 26 degrees Celsius ismixed with 25 mL of water at 85 degrees Celsius what is the finaltemperature? (Assume that no heat is released...
- Q A buffer is made from 3.7 ?? 10?1 M of HC2H3O2 and 2.9 ?? 10?1 Mof NaC2H3O2a. What is the pH?b. If you added 3.0 ?? 10?3 moles of NaOH...
- Q How long would it take to deposit 500 g of silver metal from asolution containing Ag+ ions using a current of 3.00 amperes? Ifthe same time was spent depositing gold...
- Q 3).The photosynthesis reaction is 6CO2 (g) + 6H2O (g) (Arrow)C6H12O6(s) + 6O2 (g). If the reaction requires 2.82 x 10^3 kJ/ moleof C6H12O6 formed: a.) How many grams of C6H12O6...
- Q 1) The data below apply to the formation of urea (NH2CONH2) fromammonium cyanate (NH4CNO). Initially, 22.9 grams of ammoniumcyanate was dissolved in enough water to prepare 1.00 L solution.The reaction...
- Q Consider the methanol(1) + ethanol(2) system at 101.325 kPa.Using Raoult's Law, predict the system temperature and vapor-phasecomposition for this mixture.
- Q One deciliter of a .9% nickel (II) nitrate solution is dilutedto a volume of 500 mL. Calculate the final [NO3-] of the resultantsolution. Answer in M please.
- Q You may have heard that ice skaters actually skate on a thinlayer of water rather than solid ice (which reduces friction on theblade and allows them to skate faster). Let’s...
- Q Discuss effects of structure and of the medium on the strengthsof acids and bases. Use examples to illustrate yourexplanation.
- Q Balance each redox reaction occurring in acidic aqueoussolution.NO-3 (aq) + Sn2+ (aq) -----> Sn4+ (aq) + NO (g)
- Q Write the half reaction for the anode and cathode for thefollowing electrochemical cells. which metal acts as the anode andwhich acts as the cathode. For each cell, combine the halfreactions...
- Q How much CO2 ir released (in pounds) per year of your normaldriving? comment on the size of your answer. CO2 is a greenhousegas) how cound you reduce \"carbon footprint'.- Assume...
- Q The volume of a sample of pure HCl gas was 277 mL at20°C and 189 mmHg. It was completely dissolved inabout 70 mL of water and titrated with an NaOH...
- Q A solution contains 8.28×10-3 M magnesium nitrate and 1.47×10-2M calcium acetate. Solid ammonium fluoride is added slowly to thismixture. What is the concentration of calcium ion when magnesiumion begins to...
- Q Balance the half-reactions assuming that they occur in acidicsolution.H2O2(aq)?H2O(l)Zn(s)?Zn^2+(aq)Ti^3+(aq)?TiO2(s)Mn(s)?Mn^2+(aq)
- Q can somebdy clearly explain me carbon dating?
- Q If you know that a sample of KI in water has a freezing point of-3.2C, what is the mass % of KI? What is the mole fraction ofKI?
- Q For the following reaction, the concentration of A and theamount of time required to decrease that concentration to one-halfof the initial concentration, t1/2, are directly proportional.Therefore, a decrease in concentration...
- Q Define the terms accuracy and precision. Give examples whichillustrate the difference between terms.
- Q Synthesis of crystalline materials is greatly facilitated if thereaction mixture is homogeneous on an atomic scale. Describe some(at least three) of the routes that could be used to synthesise asample...
- Q One of the treatments for breast cancer is the administration ofselective aromatase inhibitors. Aromatase is an enzyme involved inthe synthesis of various estrogens, such as estrone and estradiol.Aromatase inhibitors can...
- Q Show the balanced oxidation and reduction half – reactionsUNDERLINE THE REDUCING AGENT and BOX THE OXIDIZING AGENT in thefinal balanced equation:NiO2 (s) + Ag (s) ------>   Ni2+ (aq) + Ag+(aq)     (Acidic...
- Q Part1:C3H8(g)+5O2(g)→3CO2(g)+4H2O(g)ΔH∘rxn=−2044kJA)ΔSsys>0orB) ΔSsys<0Part 2:A)ΔSsurr>0orB)ΔSsurr<0Part 3)A)The reaction is spontaneous at all temperatures.B)The reaction is spontaneous at high temperatures.C)The reaction is spontaneous at low temperatures.D)The reaction is nonspontaneous at all temperatures.Part 4) N2(g)+O2(g)→2NO(g)ΔH∘rxn=+182.6kJA)ΔSsys>0orB)...
- Q InBradford Assay experiment, we diluted the protein solution and endof the experiment we obtained more protein than we expected.What can be possible problems during perform theexperiment?
- Q How many molecules of NH3 are produced from 8.50x10^-4 g ofH2
- Q Please show all work.3. The dissociation of the HO-H bond in water requires 493kJ/mol.a) How much energy, in joules, is required to break the HO-Hbond in a single water molecule?b)...
- Q What are self-assembled monolayers and how are theycharacterized?
- Q What are self-assembled monolayers and how are theycharacterized?
- Q For a particular redox reaction NO is oxidized to NO3
- Q What are NHCs and how do they differ from \"normal\"carbenes?(NHCs is N-heterocyclic carbenes)
- Q If your favorite silver jewelry ever tarnishes and you happen tohave some aluminum foil on hand, you can actually get rid of someof that tarnish. The tarnish here is actually...
- Q At 1 atm, how much energy is required to heat 37.0 g of H2O(s)at –10.0 °C to H2O(g) at 169.0 °C? Helpful constants can be foundhere.Quantityper gramper moleEnthalpy of fusion333.6...
- Q How does NMR allow us to understand the connection between bondrotation and the kinetic energy within the sample beinganalyzed?
- Q The following compounds can be formed during the Maillardreaction. For each compound:CompoundFrom Caramelization? (Y/N)ColorAroma/Taste#O’s#N’s#S’sRing Y/NC=O Y/NDiacetyl2,4,5-trimethyl thiazole2-acetyl-3,5-dimethyl pyrazineDifurfuryl sulfide3-ethyl pyridineFurfuralLevulinic acid1-methyl pyrrolePhenylpyruvic acid2-thienyl mercaptan
- Q I made a solution of fluorscein and diluted it with ethanol, andI was confused about some stuff.Does emission and excitation depend on concentration?Would would change if I diluted it with...
- Q A buffer solution is prepared by mixing 20.0 mL 0.45 M HAc(acetic acid) with 35.0 mL 0.45 MNaAc (sodium acetate) (a) What isthe amount of 4.0 M HAc which must...
- Q 3) The following “cycle of copper†experiment is performed insome general chemistry laboratories. The series of reactions startswith copper wire and ends with metallic copper. The steps are asfollows:I. A...
- Q For the following reaction, Keq is 0.00183 at 390. K: PCl5(g)PCl3(g) + Cl2(g) If 2.89 g of PCl5 is placed in a 2.86 L bulb at390. K, what is the...
- Q Briefly discuss the chemistry of the aqua complexes of[Mo3Q4(H2O)9] 4+ (where Q = S or Se).
- Q 4. If you expect the unknown acid molarities to be between 0.010M and 0.20 M and the sodium hydroxide solution to be 0.050 M, whatvolume of unknown acid solution would...
- Q Suggest some possibilities as to why your buffer pH might not beexactly 8.0
- Q at 25 C, a 0.010mol/L ammonia solution is 4.3 percent ionized.Calculate the pH
- Q Explain anaplerortic reactions and describe the principal suchreaction for the CAC and the regulation of its activity inanimals
- Q What are the clear differences in reduction of [Co(NH3)5MoO4] +and [Co(NH3)5CrO4] + by L-ascorbic acid? Would you expectL-ascorbic acid to reduce the Co(III), Cr(VI), and Mo(VI) metalcenters when you discuss...
- Q Raoult's Law describes a simple relationship between the vaporpressure of an ideal solution and the vapor pressure of puresolvent. Non-ideal solutions, however, show deviation from thisideal behavior. Solutions with vapor...
- Q (THIS IS A MIXTURE OF ALL OF THE FOLLOWING ACIDS AND BASES MIXEDTOGETHER WHERE A COMBINED pH IS WHAT I AM LOOKING FOR)1. I have 0.500 Liters of water. To...
- Q In the reaction of nitrogen gas with oxygen gas to producenitrogen oxide. What is the effect of adding more nitrogen gas tothe initial reaction mixture? N2+O2-2NO. A) the equilibrium shiftsto...
- Q Mass of flask and foil(g) - 64.5297gMass of flask, foil and condensed vapor - 64.9787gTemperature of boiling water bath - 101.2 CVolume of flask (mL) - 153.0Barometric pressure - 762.4...
- Q Calculate the percent ionization of 8.0
- Q As a technician in a large pharmaceutical research firm, youneed to produce 450. mL of a potassium dihydrogen phosphate buffersolution of pH = 6.91. The pKa of H2PO4− is 7.21....
- Q Why does the antifreeze ethylene glycol,HO-CH2-CH2-OH, molar mass 62.07 g/mol, have a much higher higherboiling point (197.6°C) than propanol (97.4°C), CH3-CH3-CH2-OH,molar mass 60.09 g/mol, even though they have similar molarmasses?
- Q Calculate the amount of sodium oxalate needed to react with 1.5ml of 0.02M of KMNO4 solution.
- Q The Ostwald process is used commercially to produce nitric acid,which is, in turn, used in many modern chemical processes. In thefirst step of the Ostwald process, ammonia is reacted with...
- Q What is the Henry's law constant for CO2 at 20∘C?Express your answer to three significant figures and include theappropriate units.What pressure is required to achieve a CO2 concentration of9.40×10−2 M...
- Q Ifmy thermometer reads 10 degrees Celsius lower that it should, whateffect will that have on my calculation of the specific heat ofmetal?
- Q Sulfide in a water sample is coulometrically titrated withiodine (H2S + I2 ----> S + 2H+ + 2I-). If a 10.00 mL aliquot ofthe water sample requires a current of...
- Q consider the isoelectronic ions Cl- and K+. Which ion issmaller?ssuming the core electrons contribute 1.00 and valence electronscontribute nothing to the screening constant, S, calculate Zeff forthese two ions.Repeat this...
- Q Ag+ + Cl- ↔ AgCl(s)1.004 g of an impure mixture containing Cl- was dissolved to100.0 mL. 10.00 mL of this solution required 22.97 mL of 0.05274 MAgNO3 to reach end...
- Q The solutions at the two Pb electrodes of a concentration cellwere prepared as follows:Cell A: A mixture of 1.00 mL of 0.0500 MPb(NO3)2 with 4.00 mL of 0.0500 M KX...
- Q Consider the following reaction at constant P. Determine thevalue of ΔSsurroundings at 298 K? Predict whether or not thisreaction will be spontaneous at this temperature. N2(g)+ 2 O2(g) → 2...
- Q For a particular redox reaction NO is oxidized to NO3– and Ag^+is reduced to Ag. Complete and balance the equation for thisreaction in basic solution. Phases are optional.
- Q The density of liquid oxygen at its boiling point is 1.14 kg/L ,and its heat of vaporization is 213 kJ/kg .How much energy in joules would be absorbed by 2.0...
- Q A 0.1358-g portion of potassium iodate (MW 214.00), about 2 g ofpotassiumiodide, and 2 mL of 6 M hydrochloric acid were dissolved in 25 mLof distilledwater. The triiodide formed during...
- Q old fashion blood pressure moniters used a colum of mercury hgto measure patients blood preassure. given that mercury has adensity of 13.6 g/ml how many milliliters of mercury would have...
- Q Sanger's reagent, DNFB, is known to react with phenolic,imidazole, and free amino groups. With this in mind, would it bepossible to determine the N and C terminals of a dipeptide...
- Q If calcium sulfate and barium sulfate do not form mixed crystals(i.e. they only form 1:1 species), what is the maximum fraction ofthe barium ion that can be precipitated as the...
- Q Assume 200. mL of 0.400 M HCl is mixed with 200 mL of 0.250 MBa(OH)2 in a constant-pressure calorimeter. The temperature of thesolutions before mixing was 25.10C; after mixng and...
- Q 3) Gold-198 has a half-life of 2.7 days. How much of a 662.5 mggold-198 sample will remain after 13.5 days?
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