Question

In the chemical reaction below, calcium metal and water react to form calcium hydroxide and hydrogen gas.
calcium metal + water → calcium hydroxide + hydrogen gas

Calcium and water are the reactants in this chemical reaction, whereas calcium hydroxide and hydrogen gas are the products that are formed. Once the reaction reaches completion,

Answer 1

Once the reaction reaches completion, all the calcium metal and water will have been consumed to form the products, which are calcium hydroxide (Ca(OH)₂) and hydrogen gas (H₂). The reaction can be represented by the balanced chemical equation:

\[ \text{Ca (s)} + 2 \text{H}_2\text{O (l)} \rightarrow \text{Ca(OH)}_2 (aq) + \text{H}_2 (g) \]

In this reaction:

- **Reactants**: Calcium metal (Ca) and water (H₂O).
- **Products**: Calcium hydroxide (Ca(OH)₂) and hydrogen gas (H₂).

Upon completion, you will have a solution of calcium hydroxide, which may appear cloudy due to the presence of undissolved solid, and hydrogen gas released, which can be observed as bubbles. If there is an excess amount of water, the solution may remain predominantly liquid, but with the hydroxide present in it, creating a basic solution.