What is the enthalpy change for the reaction: CaCO3(s) → CaO(s) + CO2(g)?
Correct Answer: Positive value (endothermic reaction)
- Step 1: Identify the reaction: CaCO3(s) decomposes into CaO(s) and CO2(g).
- Step 2: Understand that this reaction is a decomposition reaction, where one compound breaks down into two products.
- Step 3: Recognize that the reaction absorbs heat from the surroundings, which means it is endothermic.
- Step 4: Conclude that the enthalpy change (ΔH) for this reaction is positive, indicating that heat is required for the reaction to occur.
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