Zadania z chemii IB HL

The diagram shows an energy cycle for the formation of solid potassium bromide from its elements. Which energy change in the cycle represents the first ionization energy of potassium? A. $\Delta H_2$ B. $\Delta H_4$ C. $\Delta H_5$ D. $\Delta H_6$

(i) Using sections 9 and 17 of the data booklet, and showing your working, deduce the type of bonding present in magnesium chloride, $\ce{MgCl2}$, and its percentage covalent character. (ii) Assuming purely ionic bonding, and using sections 9 and 12 of the…

Which equation represents the enthalpy change of atomization, $\Delta H_\mathrm{at}$, of iodine? A. $\ce{I2(s) -> I2(g)}$ B. $\ce{I2(g) -> 2I(g)}$ C. $\ce{1/2I2(g) -> I(g)}$ D. $\ce{1/2I2(s) -> I(g)}$

Which processes in the Born–Haber cycle for magnesium oxide are endothermic? I. Enthalpy of formation of magnesium oxide, $\ce{Mg(s) + 1/2 O2(g) -> MgO(s)}$ II. Second electron affinity of oxygen, $\ce{O^-(g) + e^- -> O^2-(g)}$ III. Lattice enthalpy of…