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The use of phenols such as tert-butylcatechol as free-radical scavengers is based on the fact that phenolic hydrogens are generally abstracted by radicals, producing relatively stable phenoxyl radicals that interrupt chain processes of oxidation and polymerization. Alcohols such as cyclohexanol, on the other hand, do no function as radical scavengers. Explain why the two types of molecules differ in their ability to donate a hydrogen atom to a radical.
A solution was prepared by dissolving 620 grams of ethylene glycol, C2H6O2 in 1000 grams of water. Find the concentation of ethylene glycol in molality. Find the freezing point and boiling point of the solution. For water Kf= -1.86 Celsius m-1 and..
Draw all the resonance structures for the N2O4 molecule. The skeletal structure of the molecule is
What chemical tests might be used to ditinguish between pentanal and 2-pentanone; between benzyl alcohol and diphenylmethanol?
the initial rate is 0.03 mol L-1 s-1 when the initial concentrations are: [?NH?_4^+ ]_0 = 0.015 mol L-1 and [?NO?_2^- ]_0 = 0.02 mol L-1. What will be the initial rate (in mol L-1 s-1) when the initial concentrations are- [?NH?_4^+ ]_0 = 0.03 mol ..
Draw the reaction between benzoic acid and NaOH and explain why it is neccessary to use 3M NaOH as the aqueous layer to better separate the benzoic acid.
A 0.1019g portion of an aspirin tablet was dissolved in sufficient water to prepare 1.000L of solution. A pipet was used to transfer 10 mL of the solution to a 100 mL volumetric flask. A 2 mL portion of 4 M NaOH (aq) was added to the flask, and th..
identify the oxidizing agent in the reaction Mg+2HCl=H2+MgCl2, the generation of hydrogen gas in the laboratory.
Rolls of aluminum foil are 300mm wide and 0.013mm thick. What maximum length of aluminum foil can be made from 0.87kg of aluminum?
If a sample is composed of 39% of the lighter isotope (with the balance being 7Li), calculate the average molar mass of the sample.
Silver chloride crystallizes with the sodium chloride (rock salt) structure. The length of a unit cell edge is 555 pm. What is the density of AgCl? Show all works.
Describe Newman projection. Experiments have shown that for 1,2-dichloroethane, ClCH2CH2Cl, in carbon tetrachloride solution at 25C, 70% of the molecules are in the anti and 30% are in the gauche conformation
What mass of sodium hydrogen carbonate is needed to make the buffer solution 0.10 M in sodium hydrogen carbonate? pH is 10.1 pka is 10.33.
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