Final answer:
Two different samples decomposing when heated will result in decomposition reactions, where a single compound breaks apart into two or more substances. The specific substances formed depend on the chemical composition of the samples. Examples include the decomposition of hydrogen peroxide and dinitrogen pentoxide.
Step-by-step explanation:
When two different samples decompose when heated, they undergo a decomposition reaction. In such reactions, a single compound breaks down into two or more substances; these can be elements or compounds. For example, the decomposition of hydrogen peroxide (H₂O₂) into water (H₂O) and oxygen gas (O₂), typically requires a catalyst like platinum. However, in other cases such as the thermal decomposition of dinitrogen pentoxide (N₂O₅) into nitrogen dioxide (NO₂) and oxygen (O₂), heating alone can cause the reaction. Different samples may decompose into different substances depending on their chemical composition.
It is important to note that when heat is added or work is done on a substance, it alters its internal energy. Yet, without additional information, it is impossible to discern whether heat or work caused the change in a sample's properties, as both can increase internal energy.