Sea shells contain mainly CaCO 3. Calcium oxide can be prepared from sea shells by

Assessment: WAEC SSCE - Chemistry - 2003 (Objective) Subject: Chemistry

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Sea shells contain mainly CaCO 3. Calcium oxide can be prepared from sea shells by
Answer Details
Calcium oxide (CaO) can be prepared from sea shells which mainly contain calcium carbonate (CaCO3) by heating at a high temperature. This process is called thermal decomposition, where heat is applied to the sea shells causing the CaCO3 to break down into its constituent elements, calcium oxide (CaO) and carbon dioxide (CO2). The reaction can be represented as: CaCO3 → CaO + CO2 Therefore, heating the sea shells at a high temperature will yield calcium oxide (CaO).
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