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Explain why the pKa of benzoic acid (pKa = 4.2) is significantly lower than the pKa of propanoic acid (pKa = 4.9). Select the single best answer.
a) Lower percentage s-character of benzoic acid's aromatic bond carbons destabilizes its conjugate base
b) Higher percentage s-character of benzoic acid's aromatic bond carbons destabilizes its conjugate base
c) Higher percentage s-character of benzoic acid's aromatic bond carbons stabilizes its conjugate base
d) Lower percentage s-character of benzoic acid's aromatic bond carbons stabilizes its conjugate base
You are given a worked wooden item from an archaeological dig believed to date to during the last glaciation. As such, the artifact would be another piece of evidence.
A student placed 20.0 g of glucose (C6H12O6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100. mL mark on the neck of the flask was reached.
For the reaction, A = B + C, the rate law is k[A]. If it takes 80.0 seconds for 70.0% of a 10.0 gram sample of A to be transformed into products, what is the value of the rate constant.
Calculate the percent by mass of calcium carbonate in the rock, assuming that it is the only substance reacting with the HCl solution.
What is the pH of the solution created by combining 2.90 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)?
10.9g of ice at 0.00 degrees C is mixed with 50.0g of water at 32.0 degrees C. What is the final temperature of the mixture? (heat of fusion=333J/g; specific heats: ice=2.09J/gK; water=4.184J/gK
Determine At what temperature does C 6 H 6 boil when the external pressure = 470 torr?
A cook wants to heat 1.73 kg of water from 30.0C to 100.0C .If he uses the combustion of natural gas (which is exothermic) to heat the water, how much natural gas will he need to burn.
If 20.0 dm3 of methane, CH4, react with 200.0 dm3 of air at STP, calculate the dm3 of carbon dioxide gas produced.
What is the rate constant of a first-order reaction that takes 215 for the reactant concentration to drop to half of its initial value?
Explain why the salt of a weak acid, as well as the acid itself, must be present to form a bu?er solution.
The volume of a gas sample is 650. mL at STP. What volume will the sample occupy at 25.0°C and 950. torr pressure.
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