Sure, let's construct the chemical equation for the reaction between calcium (Ca) and water (H₂O), including the state symbols.
1. Identify the Reactants:
- Calcium (Ca): Calcium is a chemical element and, in its standard state, is a solid. Thus, we denote it as [tex]\( \text{Ca(s)} \)[/tex].
- Water (H₂O): Water is a liquid at room temperature. Therefore, we denote it as [tex]\( \text{H₂O(l)} \)[/tex].
2. Identify the Products:
- Calcium Hydroxide [tex]\( \left(\text{Ca(OH)}_2\right) : When calcium reacts with water, it forms calcium hydroxide. Calcium hydroxide is typically found in an aqueous state in such reactions, so we denote it as \( \text{Ca(OH)}_2\text{(aq)} \)[/tex].
- Hydrogen Gas (H₂): The reaction also produces hydrogen gas, which we denote as [tex]\( \text{H₂(g)} \)[/tex].
3. Balance the Chemical Equation:
- The balanced equation needs to have the same number of each type of atom on both sides of the equation.
- Reactants: one calcium atom (Ca) and two water molecules (2 H₂O).
- Products: one calcium hydroxide molecule [tex]\( \left(\text{Ca(OH)}_2\right) \)[/tex] and one molecule of hydrogen gas (H₂).
Constructing the balanced chemical equation:
[tex]\[ \text{Ca(s)} + 2 \text{H₂O(l)} \rightarrow \text{Ca(OH)}_2\text{(aq)} + \text{H₂(g)} \][/tex]
So, the detailed step-by-step solution results in the final chemical equation including state symbols:
[tex]\[ \text{Ca(s)} + 2 \text{H₂O(l)} \rightarrow \text{Ca(OH)}_2\text{(aq)} + \text{H₂(g)} \][/tex]
This represents the reaction of calcium with water, producing calcium hydroxide in aqueous form and hydrogen gas.
