Explain the lack of reactivity of nitrogen gas, N2(g).

1. (a)(i)Explain the lack of reactivity of nitrogen gas, N2(g).[2]
2. (a)(ii)Covalent bonds can be σ bonds or π bonds. Complete Table 1.1 to show the number of σ and π bonds in a molecule of N₂ and to describe how the orbitals overlap to form σ and π bonds. Table 1.1 σ bond π bond number of bonds in N₂ how the orbitals overlap[4]
3. (b)(i)A sample of Al reacts with an excess of Cl2. State the oxidation number of Al in the product of the reaction. oxidation number of Al[1]
4. (b)(ii)State what determines the maximum oxidation number of the Period 3 elements in their oxides.[1]
5. (c)(i)Separate samples of aluminium oxide, Al2O3, and phosphorus(V) oxide, P4O10, react with an excess of NaOH(aq) at room temperature. Give the state of Al2O3 and P4O10 at room temperature. Al2O3 P4O10[1]
6. (c)(ii)Write an equation for the reaction of each oxide with an excess of NaOH(aq) at room temperature. Al2O3 + P4O10 +[2]
7. (d)(i)The oxide of silicon reacts with calcium oxide in an addition reaction to produce calcium silicate, CaSiO3. The oxidation number of calcium in CaSiO3 is +II. Deduce the oxidation number of silicon in calcium silicate. oxidation number of silicon[1]
8. (d)(ii)Calcium oxide can be made from calcium carbonate in a single-step reaction. Identify the type of reaction that occurs.[1]