Describe two physical properties of sodium that are unlike those of transition elements such as copper.
State one observation when sodium is added to water.
Calculate the mass, in g, of sodium azide required to make $144\,\text{dm}^3$ of nitrogen by following the steps below.
Classify each oxide below:\n\nsodium oxide\n\nsilicon(IV) oxide
Deduce the formula for the azide ion.
Complete the equation for the reaction in which aqueous lead(II) nitrate and aqueous sodium azide produce solid lead(II) azide and aqueous sodium nitrate. State symbols must be included.\n\n$\text{Pb(NO}_3)_2(aq) + \ldots\ldots\ \text{NaN}_3(aq) \rightarrow \text{Pb(N}_3)_2(\ldots) + \ldots\ldots\ldots (\ldots)$
Describe how you could obtain a sample of lead(II) azide that is free from contamination by any soluble salts present in the reaction mixture.
Calculate the empirical formula for the organic compound.