Zadanie 1a
State one method that could be used to follow the progress of this reaction and explain how its measurements allow the rate, in mol dm−3 s−1, to be determined.
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State one method that could be used to follow the progress of this reaction and explain how its measurements allow the rate, in mol dm−3 s−1, to be determined.
The concentration of hydrogen peroxide in a reaction mixture was followed for 600 s and the results are plotted in the graph. (i) Determine the instantaneous rate of the reaction, to two significant figures, when [H2O2] = 0.160 mol dm−3.…
What is the molecular formula of the compound with empirical formula CH2 and the following mass spectrum? A. C4H8 B. C6H12 C. C7H14 D. C8H16
(i) Calculate, in J, the thermal energy gained by the water. Use sections 1 and 2 of the data booklet. (ii) Determine the percentage uncertainty of the energy value from (i). (iii) Suggest one way to reduce the effect of random uncertainty on the final result.
(i) Determine the molar enthalpy of combustion of butan-1-ol, in kJ mol−1, and state one assumption you made. If you did not obtain an answer to 2a(i), use 20 000 J, but this is not the correct value. (ii) Calculate the percentage error of your…
A second spirit burner contains hexane, C6H14, instead of butan-1-ol. Determine whether hexane would release more or less energy per gram than butan-1-ol. Use section 14 of the data booklet.
Methanol and butan-1-ol are members of the same homologous series. (i) Name the class of compound and the functional group that characterize this series. (ii) State the strongest intermolecular force between molecules of either alcohol. (iii) Predict one type…
Pentan-2-ol is optically active. (i) Sketch the two enantiomers of pentan-2-ol, showing how they are related. (ii) Deduce the organic product formed in each case when pentan-1-ol and pentan-2-ol are refluxed with acidified potassium dichromate(VI).…
Butan-1-ol can be produced from 1-bromobutane. (i) Identify a nucleophile that would convert 1-bromobutane into butan-1-ol. (ii) Using curly arrows, sketch the mechanism for the reaction of 1-bromobutane with the nucleophile you identified in (i).
An ester used as a pear flavouring is made by heating ethanoic acid with propan-1-ol in the presence of concentrated sulfuric acid: CH3COOH + CH3CH2CH2OH → CH3COOCH2CH2CH3 + X (i) Identify the type of reaction. (ii) Identify the second product, X, of…