Sure, let’s break this down step-by-step so we can understand what's going on with this expression:
1. Chemical Equation: The given expression \( \text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2 \) is a symbolic representation of a chemical reaction. It describes the transformation of calcium carbonate (CaCO3) into calcium oxide (CaO) and carbon dioxide (CO2).
2. Reactants and Products:
- Reactants: These are the substances that undergo a chemical change. In this equation, calcium carbonate (CaCO3) is the reactant.
- Products: These are the substances formed as a result of the chemical reaction. Here, calcium oxide (CaO) and carbon dioxide (CO2) are the products.
3. Components of the Equation:
- \( \text{CaCO}_3 \) is the reactant on the left side of the equation.
- \( \text{CaO} \) and \( \text{CO}_2 \) are the products on the right side of the equation.
4. Understanding the Types of Descriptions:
- Reactant: An initial substance involved in the reaction.
- Product: The substance(s) formed from the reaction.
- Chemical Equation: A representation using symbols and formulas to depict a chemical reaction.
- Chemical Progression: This term is less commonly used and is not precise in the context of describing the nature of the expression.
Given this breakdown, the best and most accurate answer is:
- The expression \( \text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2 \) is an example of a chemical equation.
So, the correct answer is:
- chemical equation.
