Chemistry question and answers for July 20, 2023
- Q A) A 50.0-mL volume of 0.15 M HBr is titrated with 0.25 M KOH.Calculate the pH after the addition of 20.0 mL of KOH.B) A 75.0-mL volume of 0.200 M...
- Q A sample of methane (CH4) has a volume of 26 mL at a pressure of0.85 atm . What is the volume, in milliliters, of the gas at eachof the following...
- Q explain the meaning of the activation energy and thepre-exponential factor in the arhenius equation(K=A*exp(-Eact/RT)
- Q Find the pH during the titration of 20.00 mL of 0.2300 M nitrousacid, HNO2 (Ka = 7.1 ✕ 10-4), with 0.2300 M NaOH solution after thefollowing additions of titrant. a)...
- Q 1) Calculate either [H3O ] or [OH
- Q A 2.00 mole sample of Arundergoes an isothermal reversible expansion from an initial volumeof 2.00 L to a final volume of 85.0L at 313 K .a) Calculate the work done...
- Q 32. When the following reaction is balanced what is thecoefficient for -OH?____N2H4 + ____ClO3-+ ____-OH à ____NO3- +____Cl- + ____H2Oa.2               b.4                 c.6                 d.8                 e. 1033. What species is the reducing agent for the reactionabove?           a....
- Q If the Ka of a monoprotic weak acid is 3.4 × 10-6, what is thepH of a 0.34 M solution of this acid?
- Q 2- Gases A2 and B2 react according to the equation: A2 + B2 →AxBy . If equimolar ( not necessarily stoichiometricallyequivalent) quantities are placed in a reaction vessel with amassless,...
- Q 4- Hydrogen and chlorine gas are placed in a 10.0 L containerand allowed to react. The initial density of the mixture is 5.01x10-3 gm/ml. The vessel is at 300K and...
- Q a.) Estimate the freezing point of 250 mL of water to which 8.5gof magnesium nitrate has been added. treat each solution asideal.b.) If we were to use 8.5g of strontium...
- Q 1. Which one describes not about a nuclear reaction but about achemical reaction?Protons, neutrons, electrons, and other elementary particles maybe involved.Rates of reaction normally are not affected by temperature,pressure, and...
- Q To verify the existence of silver in your solution, one shouldfirst form a white precipitate by addition of NaCl. Next, theprecipitate should dissolve in aqueous ammonia. Silver canre-precipitate by addition...
- Q When coal is burned, the sulfur present in coal is converted tosulfur dioxide (SO2), which is responsible for the acid rainphenomenon. S(s) + O2(g) → SO2(g) If 4.82 kg of...
- Q Calculate [H3O ], [ClO4–], and [OH–] in an aqueous solution thatis 0.130 M in HClO4(aq) at 25 °C.[H^+]=[ClO4^-]=[OH^-]=Is the solution acidic, basic or neutral?
- Q 3. Fluorine reacts with vanadium to produce vanadium(V) fluorideaccording to the following equation: 5 F2 (g) + 2 V (s) → 2 VF5 (l)(a) How many moles of vanadium are...
- Q 1)The minimum frequency of light needed to eject electrons froma metal is called the threshold frequency, ν0. Find the minimumenergy needed to eject electrons from a metal with a thresholdfrequency...
- Q how many photons are produced in a laser pulse of 0.558 J at 431nm?
- Q You are making sandwiches again. This time, one double-deckersandwich consists of 3 slices of bread, 2 chicken slices, and 4tomato slices. Suppose that you have 3.15 kg of slices of...
- Q The standard free energy of activation of a reaction A is 75.1kJ mol–1 (17.9 kcal mol–1) at 298 K. Reaction B is one milliontimes faster than reaction A at the...
- Q “Condensation†polymerization involves the formation and loss ofa small molecule (such aswater) as each monomer is added to thegrowing polymer chain. What small molecule would be formed by thereaction of...
- Q A 1.100 L sample of HCl gas at 25∘C and 732.0 mm Hg was absorbedcompletely in an aqueous solution that contained 6.900 g of Na2CO3and 265.0 g of water.What is...
- Q The optimal pH for condensing an amine with a carbonyl group tocreate an imine is pH = 5-6. a. Show a predicted reaction mechanismusing curved arrows to show how this...
- Q Calculate the pH in 0.780 M CH3CO2H.
- Q The questions below refer to a solution of butanoic acid,CH3(CH2)2-COOH, in water. The solution was formed by adding 1.15 gof butanoic acid to enough water to make 100 mL of...
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