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Deduce, giving a reason, which of the two dyes, orange or violet, is the more polar.
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Deduce, giving a reason, which of the two dyes, orange or violet, is the more polar.
The student suspected that the ink contained more than four dyes, and that one of the spots was two dyes that had not separated. Suggest how the student could modify the chromatography experiment to test this idea.
(i) Deduce the expression for the equilibrium constant, , for this reaction. (ii) each of propan-1-ol and ethanoic acid, together with a small amount of concentrated sulfuric acid, reacted at constant volume. At equilibrium,…
(i) Sketch the Maxwell–Boltzmann energy distribution curve for the particles in this reaction mixture. Label the activation energy with and without the catalyst on the diagram. (ii) On the same axes, sketch and label a second Maxwell–Boltzmann curve for this…
State the most important property that water must have, with respect to benzoic acid, for it to be a suitable solvent for this recrystallization.
Outline how each of the two by-products is removed from the benzoic acid during the recrystallization. By-product that is almost insoluble in hot water: ... By-product that is much more soluble than benzoic acid: ...
The volume of hot water used to dissolve the crude solid must be chosen carefully. Deduce the effect on the yield or on the purity of the recrystallized benzoic acid of using too much water and of using too little water. Too much water: ... Too little water:…
Chlorinated solvents such as tetrachloromethane, , and 1,1,1-trichloroethane, , were once common in laboratories, but their production is now restricted by an international agreement. Besides climate change, state the specific…
(i) If the reaction has a percentage yield of 80 %, calculate the mass, in g, of benzene that would be produced from 2.0 kg of cyclohexane. (ii) Calculate the atom economy for this reaction, as a percentage.
The forward reaction is endothermic, uses platinum as a catalyst, and takes place at 800 K. Sketch the reaction's energy profile both with and without the catalyst present, labelling the activation energies and .