(i) Draw and label an energy profile diagram of an endothermic reaction. Indicate on your diagram the I. activation energy II. heat change, \(\Delta\)H.

(ii) Explain how the rate of reaction is affected by I. addition of a catalyst, II. increase in temperature.

 

(b)(i) Write an equation for the thermal decomposition of calcium trioxocarbonate (IV)

(ii) Determine the volume of carbon (IV) oxide measured at s.t.p. that would he produced by the thermal decomposition of 10g calcium trioxocarbonate (IV). [ Ca = 40; O = 16; C = 12 ]

 

(c)(i) Give one use cf each of the following forms of carbon: I. coal; II. wood charcoal; Ill. carbon (IV) oxide.

(ii) Write a balanced chemical equation to show what happens when each of the following compounds is heated strongly: I. NaNO\(_{3(s)}\) II. MgCO\(_{3(s)}\).

 

(d) Consider the following compounds: CaO, CaCO\(_3\), Ca(OH)\(_2\), NaOH Which of them is

(i) used in the manufacture of cement;

(ii) used to detect the presence of carbon (IV) oxide;

(iii) used to liberate carbon (IV) oxide when dilute acid is added;

(iv) hygroscopic;

(v) deliquescent?