17. As the atomic number of the alkali metals increases A the ionisation energy decreases B the atomic size decreases C the density decreases D the melting point increases. 18. Which equation represents the first ionisation energy of a diatomic element, X2? A ½ X2(s) X+(g) B ½ X2(g) X–(g) C X(g) X+(g) D X(s) X–(g) 19. Which of the following equations represents the first ionisation energy of fluorine? A F–(g) F(g) + e– → B F–(g) ½ F2(g) + e– → C F(g) F+(g) + e– → D ½ F2(g) F+(g) + e– → 20. Which of the following reactions refers to the third ionisation energy of aluminium? A Al(s) Al3+(g) + 3e– → B Al(g) Al3+(g) + 3e– → C Al2+(g) Al3+(g) + e– → D Al3+(g) Al4+(g) + e– → 21. The table shows the first three ionization energies of aluminium. Using this information, what is the enthalpy change, in kJ mol–1, for the following reaction? Al3+(g) + 2e– Al+(g) → A +2176 B –2176 C +4590 D –4590
17. As the atomic number of the alkali metals increases A the ionisation energy decreases B the atomic size decreases C the density decreases D the melting point increases. 18. Which equation represents the first ionisation energy of a diatomic element, X2? A ½ X2(s) X+(g) B ½ X2(g) X–(g) C X(g) X+(g) D X(s) X–(g) 19. Which of the following equations represents the first ionisation energy of fluorine? A F–(g) → F(g) + e– B F–(g) → ½ F2(g) + e– C F(g) → F+(g) + e– D ½ F2(g) → F+(g) + e– 20. Which of the following reactions refers to the third ionisation energy of aluminium? A Al(s) → Al3+(g) + 3e– B Al(g) → Al3+(g) + 3e– C Al2+(g) → Al3+(g) + e– D Al3+(g) → Al4+(g) + e– 21. The table shows the first three ionization energies of aluminium. Using this information, what is the enthalpy change, in kJ mol–1, for the following reaction? Al3+(g) + 2e– → Al+(g) A +2176 B –2176 C +4590 D –4590
CCS%20EXAM%20QUESTIONS.docx