Certain chemicals can combine to create several types of explosions: 1. **Chemical Explosion**: This is the most common type and is caused by a chemical reaction (such as a redox reaction) that usually releases large amounts of gas quickly, resulting in a dramatic increase in pressure and explosion. Examples include explosives such as TNT and ammonium nitrate and fuel oil mixtures (ANFO). 2. **Thermal Explosion**: This is caused by the rapid release of energy due to the decomposition or polymerization of compounds when heated. Typical examples include the behavior of peroxides and certain metal hydrides when heated. 3. **Physical Explosion**: This does not involve a chemical reaction but is caused by a change in physical state, such as the rapid vaporization of liquid carbon dioxide or liquid nitrogen, which causes a sudden increase in pressure. 4. **Peroxide Explosion**: Certain organic peroxides may explode when heated, rubbed, or impacted because they are inherently highly oxidizing and unstable. 5. **Gas Mixture Explosion**: When flammable gases (such as hydrogen) are mixed with oxygen or air, they may explode when stimulated by an initiation source such as a spark. When conducting any chemical experiment or operation, it is important to understand the characteristics of the chemicals used and the possible reaction risks to ensure safety.