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==Key Stage 3==
===Meaning===
[[Calcium Oxide]] is a [[solid]] (at [[Room Temperature|room temperature]]) chemical [[compound]] with the [[Chemical Formula|formula]] CaO.
===About Calcium Oxide===
: [[Calcium Oxide]] is a [[base]].
: [[Calcium Oxide]] [[Chemical Reaction|reacts]] with [[acid]]s to produce a [[Calcium]] [[salt]] and [[water]].
:: [[Hydrochloric Acid]] + [[Calcium Oxide]] → [[Calcium Chloride]] + [[Water]]
:: [[Sulphuric Acid]] + [[Calcium Oxide]] → [[Calcium Sulphate]] + [[Water]]
:: [[Nitric Acid]] + [[Calcium Oxide]] → [[Calcium Nitrate]] + [[Water]]
==Key Stage 4==
===Meaning===
[[Calcium Oxide]] is a [[solid]] ([[STP]]) chemical [[compound]] with the [[Chemical Formula|formula]] CaO.
===About Calcium Oxide===
: [[Calcium Oxide]] is a [[base]].
: [[Calcium Oxide]] is held together by [[Ionic Bond|ionic bonds]].
: [[Calcium Oxide]] has a [[Giant Ionic Structure|giant ionic structure]].
: [[Calcium Oxide]] [[Chemical Reaction|reacts]] with [[acid]]s to produce a [[Calcium]] [[salt]] and [[water]].
:: [[Hydrochloric Acid]] + [[Calcium Oxide]] → [[Calcium Chloride]] + [[Water]]
:: 2HCl + CaO → 2CaCl<sub>2</sub> + H<sub>2</sub>O
:: [[Sulphuric Acid]] + [[Calcium Oxide]] → [[Calcium Sulphate]] + [[Water]]
:: H<sub>2</sub>SO<sub>4</sub> + CaO → CaSO<sub>4</sub> + H<sub>2</sub>O
:: [[Nitric Acid]] + [[Calcium Oxide]] → [[Calcium Nitrate]] + [[Water]]
:: 2HNO<sub>3</sub> + CaO → Ca(NO<sub>3</sub>)<sub>2</sub> + H<sub>2</sub>O