State two physical-property differences between sodium and diamond.
A sodium ion has the symbol $^{23}_{11}\text{Na}^+$. Deduce how many protons, neutrons and electrons are present in this ion.
Sodium combines with nitrogen to form sodium nitride. Complete the equation for this reaction. $\ldots\,\text{Na} + \ldots \rightarrow \ldots\,\text{Na}_3\text{N}$
When carbon is heated with steam inside a closed container, an equilibrium mixture is established. $\text{C(s)} + \text{H}_2\text{O(g)} \rightleftharpoons \text{CO(g)} + \text{H}_2\text{(g)}$ The forward reaction is endothermic. Describe and explain the effect, if any, on the position of equilibrium when the temperature is increased.
Describe and explain, if there is any effect, how the position of equilibrium changes when the pressure is lowered.