Chemistry question and answers for August 05, 2023
- Q 1.A bucket of nails contains 348 nails. How many dozens of nailsdoes the bucket contain? 1 dozen=12 objects 2.How many atoms are in3.56 mol of pure aluminum? 3.For the given...
- Q 1. Explain why a packed fractionating column (steel wool insidethe glass tube) is more efficient than an unpacked one fordistillation? Explain in detail.2. If 3 spots on a TLC, plates...
- Q Provide a desription of the Kreb's cycle in the biosynthesis ofamino acid
- Q The dibasic compound B (pKb1 = 4.03, pKb2 = 8.06) was titrated with1.18 M HCl. The initial solution of B was 0.118 M and had a volumeof 100.0 mL. Find...
- Q The samples of cyclohexane and toluene you collected duringdistillation were kept in a fridge for a week before being analyzedby GC. Explain what would be different about the GC analysisresults...
- Q Modern pennies are composed of zinc coated with copper. Astudent determines the mass of a penny to be 2.480 g and then makesseveral scratches in the copper coating (to expose...
- Q Excited H atoms have many emission lines. One series of lines,called the brackett series, occurs in the infrared region. Itresults when an electron changes from higher energy levels to alevel...
- Q Consider the data for the following reaction at 25oCÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â 2 HgCl2(aq) +C2O42-(aq) --------2Cl-(aq) + 2 CO2 (g) +Hg2Cl2(s)Â Â Â Where Rate =[C2O42-]/tDetermine the 'orders for each reactant.Determine the rate constant for this...
- Q a. A 1.500 g sample of a mixture of solid Na3PO4 - 12H2O andBaCl2 - 2H2O was dissolved in water and formed 0.520g of Ba3(PO4)2precipitate. If reagent tests demonstrated that...
- Q Find the normal [H2CO3] in bloodH2CO3(aq) -><- H+(aq) +HCO3-(aq) (K=4.3x10^-7)
- Q Summarize 4th phase of water
- Q Using the values of the effective molar absorptivities youdetermined from your slopes and the values of the absorption youobtained for the mixture at the spectral maxima of 434nm and 618...
- Q Consider the following reduction potentials:Mg2+ + 2e- → MgE° = -2.37 VV2+ + 2e- → VE° = -1.18 VCu2+ + e- → Cu+E° = +0.15 VWhich one of the following...
- Q 1.) An unknown carbohydrate solution tested positive withmolisch reagent, formed a red precipitate with barfoed's reagentwithin 3 minutes, and turned blue-green when mixed with bialsreagent. what carbohydrate is this?2.) Erythrose...
- Q If i were to get the amount of heat transfer using constantpressure calorimetery, can I get the amount for the constant volumecalorimetery using that value? Or vice versa?
- Q A 115.0 −mL sample of a solution that is 2.6×10−3 Min AgNO3 is mixed with a 230.0 −mL sample of a solution that is0.14 M in NaCN .After the solution...
- Q At 85oC, the vapor pressure of pure o-xylene is 55 Torr and thevapor pressure of pure p-xylene is 85 Torr. When liquid o-xylene ismixed with liquid p-xylene, the solution formed...
- Q A solution contains 0.003Mof sodium phenobarbitaltogether with a buffer consisting of 0.20 M sodium acetateand 0.30 M acetic acid. Acetic acid is a weak electrolyte;its degree, or fraction, of dissociation,...
- Q Could you give me some tips on how to know how to identifychiral centers in a large molecule?I know that a chiral center is surrounded by 4 differentgroups...but I'm finding...
- Q If the dissolution of KCl (74.55 g/mol) is expected to absorb17.2 kJ of energy per mole of KCl dissolved, then what is theexpected change in temperature (in oC) if 2.11...
- Q The average human body contains 5.70 L of blood with a Fe2+concentration of 2.10×10−5M . If a personingests 10.0 mL of 25.0 mM NaCN, what percentage ofiron(II) in the blood...
- Q Consider the reaction: CO(g)+H2O(g)⇌CO2(g)+H2(g) Kc=102 at 500 KA reaction mixture initially contains 0.135 M CO and 0.135 M H2O.What is the equilibrium concentration of [CO], [H2O], [CO2], and[H2]
- Q 1.  An electrode of solid chromium is immersed in a1M solution of Cr3+; In a second beaker, a tin electrodeis immersed in a 1 M solution of Sn2+. The twoelectrodes...
- Q At a temperature other than 25oC, Cd(OH)2solubility is 5.5 x 10-4 . Calculate it's Ksp at thistemperature.[ACCORDING TO MY TEXT, Ksp of Cd(OH)2 = 2.5 x1014 @ 25 C]A.1.7 x...
- Q An analytical chemist is titrating 60.3 mL of a 0.5500 Msolution of nitrous acid (HNO2) with a 0.6400 M solution of KOH.The pKa of nitrous acid is 3.35. Calculate the...
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