Chemistry question and answers for July 15, 2023
- Q Consider a weak base-strong acid titration in which 25 mL of0.160 M ammonia is titrated with 0.160 M HCl.a) What is the pH of the ammonia solution before the addition...
- Q In a Wittig Reaction, I used 0.175 g of 4-nitrobenzaldehyde and0.467 g of benzyltriphenylphosphonium to yield 4-nitrostilbene. Iam trying to find the percent yield for crude and trans product. Inthis...
- Q Four hundred fifty gallons (plus or minus a half gallon) of amixture of 75.0 wt% ethanol and 25.0 wt% water (mixture specificgravity=0.877) and a quantity of 40.0 wt% ethanol and...
- Q Consider the titration of a 25.0 −mL sample of 0.110 M HC2H3O2with 0.125 M NaOH. Determine each of the following.(please doall)a)the initial pHb)the volume of added base required to reach...
- Q In a hurry to complete the experiment, Joseph failed tocalibrate the spectrophotometer. As a result, all absorbance valuesfor the standard solutions that are measured and recorded are toohigh. How will...
- Q In photosynthesis, plants form glucose (C6H12O6) and oxygen fromcarbon dioxide and water. Calculate ΔS∘rxn at 25 ∘C. CalculateΔG∘rxn at 25 ∘C.
- Q a. If you have two chromatograms of the same mixture, but theyare from two different GC instruments, then how do you determinewhich one gives you better separation. For example, if...
- Q Part A: A solution contains7.68×10-3 M iron(II)acetate and 5.92×10-3 Mzinc nitrate.Solid potassium hydroxide is added slowly to thismixture.A. What is the formula of thesubstance that precipitates first?B. What isthe concentrationof...
- Q 1.) What is the purpose of making derivatives of unknowns?2.) Give three reasons why acetone might interfere with yourresults.3.) An unknown sample does not react with2,4-dinitrophenylhydrazine reagent, but a color...
- Q a 0.15 m solution of the weak base B at 25.0°C has aph of 8.88. the value of kp for B is?
- Q For a gas of neutral hydrogen atoms, at what temperature willequal numbers of atoms have electrons in the a) ground state (n =1) and in the first excited state (n...
- Q A 115.0 −mL sample of a solution that is 3.0×10−3 M in AgNO3 ismixed with a 225.0 −mL sample of a solution that is 0.13 M inNaCN.After the solution reaches...
- Q A mixture is made by combining 14 mL of 1.9×10−3 M KSCN, 7.8 mLof 9.1×10−2 M Fe(NO3)3, and 11.7 mL of 0.475 M HNO3. Calculate theconcentraion of Fe3+ in the...
- Q Use the following equation: Ag2SO4 + 2KCl → 2AgCl + K2SO4How many mL of 1.4 M Ag2SO4 are needed to titrate out 75.0 mL of2.5 M KCl? How many L...
- Q Explain qualitatively how DG changes in each of the followingreactions as the partial pressure of O2 isincreased:(a) 2CO(g) + O2 (g) ® 2CO2(g)(b) 2H2O2 (l) ® 2H2O(l) +O2(g)( c) 2KClO3(s)...
- Q ASAP.I ) NaCl (s) = Na+ (aq)Â Â +Cl- (aq)^^^What is the stress and which direction should the equilibriumshift?III ) Fe+3(aq) + SCN-(aq) =Fe(SCN)+2(aq)^^^What is the stress and which direction should...
- Q Which statements are true for SN2 reactions of haloalkanes? (a)Both the haloalkane and the nucleophile are involved in thetransition state. (b) The reaction proceeds with inversion ofconfiguration at the substitution...
- Q The pKa of the α-carboxyl group of phenylalanine is 1.83, andthe pKa of its α-amino group is is 9.13.Calculate the average net chargeon phenylalanine if it is in a solution...
- Q What is the maximum number of electrons in an atom that can havethe following quantum numbers? (a) n = 3, ms = -1/2 (b) n = 6, l =2 (c)...
- Q Which of the following gives a possible quantum numbersassigment for the last electron added to the sodium atom whendeveloping the electron configuration using the aufbauprinciple?
- Q Ethylamine, C2H5NH2,is a weak base. 250.0 mL of a 0.160 M C2H5NH2Â Â solutionis titrated with 0.500 M HCl (aq). Find the KbKbvalue in a lecture slide. Calculate the pH at the...
- Q Vitamin K is involved in normal blood clotting. When 1.91 g ofvitamin K is dissolved in 25.0 g of camphor, the freezing point ofthe solution is lowered by 6.40 °C....
- Q 1). Both H2PO3− and HS− are amphoteric. Write an equation toshow how H2PO3− can act as a base with HS− acting as an acid.Express your answer as a chemical equation....
- Q Aspirin Synthesis Lab: What is the purpose of \"buffered\"aspirin?
- Q For each of the following reactions, 13.0 g of each reactant ispresent initially. Determine the limiting reactant.2Al(s)+3Cl2(g)→2AlCl3(s). Calculate the grams of product inparentheses that would be produced. (AlCl3)
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