Zadanie 1e
When A is refluxed with excess acidified potassium dichromate(VI), K2Cr2O7, the product is compound E, whose molar mass is greater than that of A. From this information alone, identify one functional group in E.
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When A is refluxed with excess acidified potassium dichromate(VI), K2Cr2O7, the product is compound E, whose molar mass is greater than that of A. From this information alone, identify one functional group in E.
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.…
A hydrocarbon has the empirical formula CH2 and a molar mass of 98.2 g mol−1. What is its molecular formula? A. C6H12 B. C7H16 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…
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…
Demonstrate that these data are consistent with the formula MgSO4 ⋅ 7 H2O.
The uncertainty in each mass reading is ±0.04 g. (i) Calculate the percentage uncertainty in the total mass loss. (ii) Using your answer to (i), calculate the absolute uncertainty in the number of moles of water per mole of MgSO4, that is the…
Deduce what the graph shows about the water in hydrated magnesium sulfate.