A chemistry class is experiments with iodine to see which common white powder items will react and make the iodine change color. Which item listed will have a chemical reaction with iodine?
To determine which item listed will have a chemical reaction with iodine, we would need to know the specific items that are listed. Without that information, it is not possible to provide a specific answer.
To determine which item will have a chemical reaction with iodine, it is essential to consider the properties of iodine and the potential reactions it can undergo. Iodine is a non-metal element with a purplish-black crystalline appearance. It sublimes readily, converting directly from a solid to a gas.
When iodine reacts with certain substances, it undergoes a chemical reaction called a substitution reaction, where the iodine atoms are replaced by other atoms or groups of atoms. In the context of your question, the common white powder items that could potentially react with iodine are those that contain reactive elements capable of displacing iodine from its compounds.
Here are some common white powder substances that can react with iodine:
1. Sodium thiosulfate (Na2S2O3): Sodium thiosulfate is a reducing agent and can react with iodine to form sodium iodide (NaI) and sodium tetrathionate (Na2S4O6).
2. Sodium bisulfite (NaHSO3): Sodium bisulfite is also a reducing agent and can react with iodine to form sodium iodide (NaI) and sodium sulfate (Na2SO4).
3. Potassium iodide (KI): Potassium iodide is known to react readily with iodine, forming a brownish solution due to the formation of a complex called iodine iodide.
4. Starch: Though starch is not a chemical reactant itself, it forms a complex with iodine, resulting in a deep blue color. This complexation reaction is often used as an indicator to detect the presence of iodine.
Therefore, out of the items listed, sodium thiosulfate, sodium bisulfite, potassium iodide, and starch are the substances that can potentially have a chemical reaction with iodine.