\begin{tabular}{l} Enter your answer. \\ Explain. What elements are present in a basic firework chemical reaction? Check your \\ answer. \\ K- \\ \\ \hline\end{tabular}

**Answer:** A basic firework chemical reaction involves the elements carbon (C), sulfur (S), potassium (K), and oxygen (O). **Explanation:** - **Carbon (C):** Acts as a fuel that burns to produce heat and light. - **Sulfur (S):** Helps lower the ignition temperature and supports the combustion process. - **Potassium (K):** Commonly found in potassium nitrate (KNO₃), which serves as an oxidizer providing the necessary oxygen for the reaction. - **Oxygen (O):** Provided by the oxidizer (potassium nitrate) to sustain the combustion of the fuel. Additionally, metal salts (such as strontium for red colors, barium for green, and copper for blue) may be added to produce different colors in the fireworks display. These metals are not always present in the most basic reactions but are essential for the vibrant colors associated with fireworks. **Check:** The answer correctly identifies the primary elements involved in a basic firework reaction: - **Carbon and Sulfur** as fuels, - **Potassium** as part of the oxidizing agent, - **Oxygen** supplied by the oxidizer. It also appropriately mentions the role of additional metals in producing various colors, providing a comprehensive overview of the essential elements in firework chemistry.