A light green powder is heated in a test tube. A gas is given off, while the solid becomes black. In which classification of matter does the green powder belong? Explain your reasoning.

A compound and the reaction is a decomposition. A compound consists of two or more elements combined.

It is a compound

To determine the classification of matter to which the green powder belongs, we need to examine its properties and the changes it undergoes when heated.

In this scenario, the green powder changes when heated: a gas is given off, and the solid turns black. These changes suggest that a chemical reaction is taking place.

Chemical reactions involve the breaking and forming of chemical bonds between atoms or molecules, resulting in the creation of new substances with different properties. The gas released during the process indicates that a chemical reaction is occurring, as a new substance in the form of a gas is being produced.

Additionally, the color change from green to black indicates a significant alteration of the composition of the powder. It suggests that the chemical properties of the substance have changed due to the reaction.

Based on this information, we can classify the green powder as a chemical compound. Chemical compounds are substances composed of different elements chemically bonded together. The heating process caused a chemical reaction, resulting in the formation of new substances.

To further determine the exact composition of the green powder, additional information such as its chemical formula or a more detailed description is needed.