Science (086) — AI-generated practice question

Balanced Chemical Equation:

$$\text{CaCO}_3(s) \xrightarrow{\Delta} \text{CaO}(s) + \text{CO}_2(g)$$

Type of Decomposition: It is a thermal decomposition reaction, as the compound is broken down by the application of heat. Since energy is absorbed, it is also an endothermic reaction.

Industrial Use of Product (CaO / Quick Lime): Calcium oxide (quick lime) is used in the manufacturing of cement and glass, and also for whitewashing — it reacts with water to form slaked lime [Ca(OH)₂], which is used to coat walls.

Source: Chapter 1, Section 1.2 & What You Have Learnt

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• Equation (1 mark): Must be balanced with correct state symbols and a heat arrow (Δ). CaCO₃ → CaO + CO₂ is already balanced as written.
• Type (1 mark): "Thermal decomposition" is the specific type; adding "endothermic" strengthens the answer. Examiners expect both terms.
• Industrial use (1 mark): The textbook links CaO (quick lime) to slaked lime and whitewashing (Section 1.2.1). Mentioning cement/glass manufacturing also earns the mark. Any one valid industrial use is sufficient.