What type of chemicals can be classified as unstable?

The classification of unstable chemicals specifically refers to those that can react adversely under certain conditions, such as heat, pressure, or the presence of other substances. Unstable chemicals have the potential to undergo dangerous reactions, which can result in explosions, releases of toxic fumes, or other hazardous situations. Understanding the conditions that lead to instability is crucial for safe handling and storage.

Liquid chemicals, while they can be unstable, aren't the only types that can fall into this category, as solids and gases can also exhibit instability. Chemicals that do not react with air do not fit the definition of instability because they show stable behavior under typical atmospheric conditions. Likewise, chemicals that are considered safe to store together are typically stable and do not exhibit the adverse reactions that would classify them as unstable. Therefore, focusing on the specific conditions that cause adverse reactions gives an accurate understanding of what unstable chemicals encompass.