Classify the following as an element, compound, homogeneous mixture, or heterogeneous mixture:
e. A green liquid with constant composition. When heated it decomposes into two new heterostomic molecules.
Based on the given information:
- A green liquid with constant composition is a homogeneous mixture.
- When heated, it decomposes into two new heterostomic molecules, indicating that it undergoes a chemical reaction. Therefore, it is not an element or a compound.
Therefore, the given substance is classified as a homogeneous mixture.