Fill in the table with the formulae and acid/base behaviour for some oxides of the Period 3 elements.
Beryllium hydroxide, $\text{Be(OH)}_2$, is an amphoteric compound that shows chemical reactions similar to aluminium oxide. State what the term amphoteric means.
Write an ionic equation for the reaction between magnesium hydroxide, $\text{Mg(OH)}_2$, and hydrochloric acid.
Two methods of making strontium hydroxide are shown. State one difference between the observations you would make for reaction 1 and reaction 2.
State how the solubility of the Group 2 hydroxides changes down the group.
Sodium peroxide, $\text{Na}_2\text{O}_2$, reacts with $\text{CO}_2$. $\text{Na}_2\text{O}_2(s) + \text{CO}_2(g) \rightarrow \text{Na}_2\text{CO}_3(s) + \tfrac{1}{2}\text{O}_2(g)$. The partial pressure of $\text{CO}_2(g)$ in a $0.500\,\text{dm}^3$ air sample is $5.37\,\text{kPa}$ at $20^\circ\text{C}$. Calculate the amount, in moles, of $\text{CO}_2(g)$ present in the air sample at $20^\circ\text{C}$.
Calculate the mass of $\text{Na}_2\text{O}_2(s)$ that would react completely with the amount of $\text{CO}_2(g)$ calculated in (i).
The peroxide ion, $\text{O}_2^{2-}$, has a single covalent bond between the two oxygen atoms. Each oxygen atom carries a negative charge. Draw a ‘dot-and-cross’ diagram for the peroxide ion. Show outer electrons only.