Question

Question #18b0f

Answer 1

Well is `"calcium oxide"` known............?

Explanation:

`"Calcium oxide"` or quicklime is certainly known. Formally it contains `Ca^(2+)` and `O^(2-)` ions. The high melting and boiling points observed for this compound are certainly consistent with an ionic species.

In aqueous solution `CaO` reacts to give an aqueous solution of so-called `"slaked lime"`:

`CaO(s) + H_2O(l) rarr Ca(OH)_2(aq) +Delta`

This reaction is the basis for the cement and mortar industry, mix in aggregate, i.e. crushed stone, and you get concrete, the premier building material of modernity.