Chemistry Year 13 Random Retrieval

Which reagent converts butan-2-one to butan-2-ol?

In which of these reactions between pairs of reagents is the bond breaking heterolytic?

(i) hydrogen bromide with propene

(ii) hydrogen bromide and butan-1-ol

(iii) sodium hydroxide with 1-bromopropane

(iv) bromine with hexane

The two compounds formed on heating 3-bromo-2-methylpentane with KOH in ethanol (which causes elimination!) are:

(i) alkenes,

(ii) position isomers,

(iii) hydrocarbons,

(iv) E/Z isomers

What are the units of k for this reaction?

At a given temperature, which of these expressions have a constant value for all equilibrium mixtures of hydrogen, iodine vapour and hydrogen iodide?

(i) [H₂]/[I₂],

(ii) [HI]²/[H₂][I₂],

(iii) [I₂]/[H₂]

(iv) [H₂][I₂]/[HI]²

Consider the following equilibrium for the Haber-Bosch process:

3H_2(g) + N_2(g) <=>2NH_3(g)

32.0 mol of H₂ was combined with 12.0 mol of N₂ and the mixture sealed and pressurised in a vessel of volume 2.00 dm³. The mixture was left until no further observable change in composition took place. At this point, 4.00 mol of NH₃ was found to be present in the mixture. The pressure was recorded as 200 000 kPa.

Calculate the value of K_c (in units: mol^-2 dm⁶) under these conditions.

What is the hydrogen ion concentration in an aqueous solution if the pH = 3.0?

pH = 2.9 for a solution which contains equal concentrations of chlorethanoic acid and sodium chlorethanoate. What is the pH of the solution after mixing it with twice its own volume of pure water?

The energy change for this process:

Br_(g) + e^- -> Br^-_(g)is called the:

From your calculation of ΔG in question 3, decide whether a solid dry sample of NaHCO_3(s) will decompose or will be thermally stable in the oven at 100^oC.

If this question is from a Random Retrieval, you can also carry out this calculation of Gibbs Energy change, ΔG, by first working out values for ΔS^Ɵ and ΔH^Ɵ by selecting the appropriate data from the ‘Selection of Thermodynamic Data’ in TOOLS.