Question: What is Le Chatelier’s principle?
Question: Give the two reactions required in order to convert an alcohol into a hydroxynitrile. Include reactants and conditions
Posted in A-Level Chemistry
Question: Explain how a hydroxynitrile is produced from a ketone.
Posted in A-Level Chemistry
Question: Name the reagent and explain the process of 1-bromoethane into propanoic acid.
Posted in A-Level Chemistry
Question: Explain why the first ionisation energy of phosphorous is different to that of sulfur.
Posted in A-Level Chemistry
Question: What is enthalpy and how can it be calculated?
Posted in A-Level Chemistry
Question: At 25°C, the initial rate of reaction is 3.1 × 10−3 mol dm−3 s−1 when the initial concentration of C is 0.48 mol dm−3 and the initial concentration of D is 0.23 mol dm−3 . Calculate a value for the rate constant at this T when rate = k [C][D].
Posted in A-Level Chemistry
Question: Describe a two step reaction route that can convert 1-Butene (CH2CHCH2CH3) into a compound that is more soluble in water. Use mechanisms to aid your answer (HINT: one of the steps involves nucleophilic substitution)
Posted in A-Level Chemistry
Question: Rank the following compounds in ascending order of melting point (and explain your reasoning): CH3CH2CH2NH2, CH3CH2CH3, CH3CH2CH2OH
Posted in A-Level Chemistry
Question: 3.786g of hydrated zinc sulphate, ZnSO4•xH2O, is heated to remove all water of crystallisation. The mass of anhydrous ZnSO4 formed is 2.122g. What is the formula of the hydrated zinc sulphate?
Posted in A-Level Chemistry
Question: The standard enthalpy of formation of glucose is -1273.3kJ/mol, and for carbon dioxide it is -393.5kJ/mol, and for water -285.8 kJ/mol. What is the standard enthalpy of combustion of glucose, C6H12O6?
Posted in A-Level Chemistry
Question: How does the reactivity change down Group 1 elements, and why?
Posted in A-Level Chemistry
Question: By comparing the forces involved, explain why hydrogen iodide (HI) would have a higher boiling point than hydrogen bromide (HBr)?
Posted in A-Level Chemistry
Question: How do you work out an electron configuration?
Posted in A-Level Chemistry
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