Chemistry Year 13 Random Retrieval

The nitrating agent for benzene is a mixture of concentrated sulfuric and nitric acids. This mixture produces:

Free-radical intermediates in the reaction of chlorine with methane include:

(i) CH₃^.

(ii) H^.

(iii) Cl^.

(iv) C^.

Which of these compounds are chiral?

(i) propan-1-ol,

(ii) propan-2-ol,

(iii) butan-1-ol,

(iv) butan-2-ol

This is the ¹H NMR spectrum of:

When 0.08 g magnesium ribbon reacts with 50 cm³ of 2.00 mol dm^-3 hydrochloric acid the reaction produces 80 cm³ gas in 400 seconds at room temperature and pressure but then stops. On repeating the reaction under the same conditions with 0.08 g magnesium ribbon and 100 cm³ of 1.00 mol dm^-3 hydrochloric acid the outcome is that the reaction:

The rate equation for the decomposition of gaseous ethanal takes the form:

rate =k[CH₃CHO]²

The rate of reaction = 0.080 mol dm^-3 s^-1 when the concentration of ethanal = 0.20 mol dm^-3.

The value of the rate constant is:

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 magnitude (numerical value) of the lattice enthalpy for these compounds increase from left to right putting first the compound with the least negative value?

(i) LiCl - LiBr - LiI

(ii) MgO - BaO - BaS

(iii) NaCl - KCl - RbCl

(iv) NaF - MgF₂ - AlF₃

Calculate the value of the enthalpy change associated with the following equation?

3Rb_(g)=> 3Rb_(s)

What is the value of E^ϴcell/V observed for a cell constructed from the following half-cells?

Mg²⁺_(aq) + 2e^- <=> Mg_(s) E^ϴcell/V = -2.37

Ag⁺_(aq) + e^- <=> Ag_(s) E^ϴcell/V = +0.80