Chemistry question and answers for September 16, 2023
- Q An extract from a toboacco leaves is completely miscible inwater at temperatures below 60 C. What is the molality of asolution of this extract in water which freezes at -0.450...
- Q How many molecules are contained in a 7.10-g sample ofdimethylmercury?What is the percentage of mercury (by mass) in the sample?
- Q You are provided with 5.05g of SO2 to react with 2.45 gg of O2.Indicate your theoretical yield by completing the followingstatements.Match the chemical formulas and amounts in the left column...
- Q 1. why does ruthenium have slow ligand exchange rate?2. what effect does this have on cancer therapy - what are thebenefits and negatives?
- Q 1) A piece of bread is inserted into a toaster andbegins to toast. Identify the correct statement.a The internal energy of the toaster decreasesas the internal energy of the bread...
- Q A liquid is contained in a reactor vessel at 115 bar absolutepressure. It is transferred to a storage vessel through a 50 mminternal diameter commercial steel pipe. The storage vessel...
- Q * Calculate the concentration of argon in the Pacific Oceangiven that the partial pressure of argon is 0.00934 atm. TheHenry’s law constant for argon in water at 25ºC is 1.4...
- Q A 1 liter sample of a lake water has an Alk of .2 meq/liter andcontains .18 mM of carbonate species.a. what is the pH ?b. how much does pH change...
- Q Using clear drawings, give a coordination chemistry exampleof:a) ionization isomersb) fac and mer isomersc) optical isomersd) linkage isomerse) hydrate isomers
- Q Indicate the oxidation number of each element in the followingspecies. Click in the answer box to open the symbol palette.(a) Cr(s)(b) Br2(l)(c) Cr3+(aq)(d) Br-(aq)
- Q Mass of filter paper+ PbI23gMass of filter paper0.52gMass of PbI22.48gMass(g) Pb(NO3)2Mass(g) KIMass(g) PbI2Moles Pb(NO3)2Moles KIMoles PbI21.66g2g2.48g5x10-30.0126x10-3The above are the data.a) using the equation for the reaction (Pb(NO3)2+2KI --> PbI2 +2KNO3...
- Q EX3A solution contains 2.2x10-3M in CU2+ and 0.33M in LiCN. If theKf for Cu(CN)42-- is 1.0x1025, how much copper ion remains atequilibrium?
- Q A 25.0 mL sample of 0.35 M lactic acid, HC3H5O3, is titratedwith 0.070 M KOH. Determine the pH of the solution at theequivalence point and at half-way to equivalence point....
- Q a hydrogen-oxygen fuel cell is used in the space program togenerate clean energy. Describe, in detail, the principle andprocess of electrical energy generation from hydrogen-oxygen fuelcell. Also include in the...
- Q If you started with 0.274g of benzil and 0.198g of dibenzylketone:1) What is the limiting reagent? How do we find out which one islimiting reagent?2) What is the theoretical yield...
- Q For the balanced equation shown below, if 98.0 grams of C2H3Br3were reacted with 62.2 grams of O2, how many grams of Br2 would beproduced? 4C2H3Br3+11O2=8CO2+6H2P+6Br2
- Q Critique the accuracy of each of these statements.A) Indicators such as methyl red provide accurate and precisemeasurements of pH.B) According to the Arrhenius definition of acids and bases,ammonia qualifies as...
- Q A 1.250 g sample of barium chloride hydrate, BaCl2.xH2O, washeated until all the water had been driven off. The remaininganhydrous salt weighed 1.060g. Use this data to calculate the valueof...
- Q 87What is the change in enthalpy (in kJ) under standard conditionswhen 246.4 g of sodium sulfate dissolves in water?Answer:
- Q How do serine proteases hydrolyze dietary proteins?Describe the catalytic activity of chymotrypsin.
- Q Calculate the pH of a buffer that is 0.225 MHC2H3O2 and 0.162 MKC2H3O2. The Ka forHC2H3O2 is 1.8
- Q 111 nmol of an antibody that binds strongly to the antigenprotein G is covalently bound to the support of an affinity columnwith a void volume of 1.54 mL. The association...
- Q As we’ve seen before in this class, the roasting of limestone(calcium carbonate) to make quicklime (calcium oxide) and carbondioxide is an important industrial process because the quicklime isused to make...
- Q Methanol, CH3OH, is a nonelectrolyte; ammonia,NH3, is a weak electrolyte; and calcium hydroxide,Ca(OH)2, is a strong electrolyte. What are the soluteparticles present in aqueous solutions of each compound? (Selectall that...
- Q . What are the main characteristics of the mobile and stationaryphases in gaschromatography?(10)2. What are the main applications and advantages of temperatureprogramming in GC? Whatis the equivalent procedure in HPLC?(20)3....
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