Chemistry question and answers for July 27, 2023
- Q Fresh orange juice is largely water and solids though much ofthe flavor comes from volatile organics present in small amounts.In producing concentrated orange juice the trick is to drive offthe...
- Q I have a mixture consisting of 0.180 M nitrous acid, and 0.150 Msodium nitrite. NOTE: pKa (nitrous acid) = 3.14. 7.First, I add 2.00 mL of 0.500 M HCl to...
- Q 2. Buffer capacity refers to the amount of acid or base a buffercan “absorb†without a significant pH change. It is governed by theconcentrations of the conjugate acid and base...
- Q how the leaving group affect the behavior of the alkyl halide inmixture of NaI/ Acetone and in mixture of AgNO3/ Ethanol?
- Q The value of Ka in water at 25 °C for propionic acid (C2H5CO2H)is 3.4 x 10-5 M. What is the pH of a 0.020 M aqueous solution ofpropionic acid?
- Q 17. 1.42 g of a compound containing carbon, hydrogen and oxygen(CXHYOZ) is subjected to combustion analysis. The results show that1.95 g of CO2 and 1.68 g of H2O were produced....
- Q What mass of a weak acid with a molar mass of 100 g/mol isnecessary to neutralize 25 ml of 0.10 M NaOH solution?What is the pH of 0.15 g of...
- Q 1. hown many grams of Mg must react with HCl in orderto produce 80.0 mL of hydrogen gas at STP?2. when dertermining the pressure of dry hydrogen gas, explain howthe...
- Q The element titanium occurs on earth as titanium (IV)oxide and is found mostly in the mineral called rutile.Rutile is abundant in beach sands in Australia and South Africa.For titanium to...
- Q Thegas phase decomposition of hydrogen iodide to hydrogen gas andiodine gas occurs with a rate of 2.35x10^-7 M^-1s^-1 at 283 degreeC and 1.62x10^-3 M^-1s^-1 at 427 degree C.A. What is...
- Q a. Nickel (II) Chloride dissolves in water to form a light greensolution. What ions are present in solution? - that is, what is'swimming around' in the aqueous solution? Write the...
- Q For a natural gas composed of: C3H8 in volume fraction 0.998C4H10 in volume fraction 0.002, Please write a balanced chemicalreaction for the combustion of this natural gas in 10 mol%sub-stoichiometric...
- Q 19.What quantity of NaOH(s) must be added to 1.00 L of 0.200 MHCl to achieve a pH of 12.00? (Assume no volume change.)20.A 65.5-mL sample of 0.14 M HNO2 (Ka...
- Q 2.516 g of a compound containing carbon, hydrogen and oxygen(CXHYOZ) is subjected tocombustion analysis.The results show that 3.082 g of CO2 and 2.705 g ofH2O were produced.What is the empirical...
- Q When light of frequency 7.17x1014 Hz shines on the surface of sodium metal,electrons are ejected with a maximum kinetic energy of1.10x10-19 J.Calculate:Â Â Â Â (a) the wavelength of this light: Answer mb) the...
- Q Enough of a monoprotic acid is dissolved in water to produce a0.0175 M solution. The pH of the resulting solution is 2.35.Calculate the Ka for the acid.
- Q Calculate the change in pH when 9.00 mL of 0.100 M HCl(aq) isadded to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq)and 0.100 M in NH4Cl(aq)....
- Q • state the purpose of quantum mechanics
- Q explain how an emission spectrum is produced experimentally
- Q Comparing enantioselective carbonyl reduction using CBS reagent,andenantioselective biological reduction using an enzyme, what is anadvantageand disadvantage for each?
- Q Give the 4 quantum numbers(n,l,mÂl,ms) for an electron, whatthey describe and their values.
- Q The following factors must be taken into consideration whenproposing a mechanism for a nucleophilic substitution reaction.Select all that apply.nucleophilicthe overall thermodynamics of the reactionbasicitythe solventthe structure of the substrate
- Q a) If a molecule can hydrogen bond, does it guarantee that itwill have a higher boiling point than a molecule that cannot?Explain why notb) If a molecule has a stronger...
- Q In a 0.5 M solution of a diprotic acid H2A(Ka1 -3.6 x 10-5 and Ka2 - 8 x10-12 at 25*C) What is the equilirbiumconcnetration of A2-?
- Q A. If the Mg3N2 is not decomposed, willthe reported magnesium to oxygen ratio be high or low? Explain.Hint: The Mg:N mass ratio is 1:0.38 and the Mg:O mass ratio is1:0.66.B....
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