* New substances are formed: When charcoal burns, it reacts with oxygen in the air. This reaction produces carbon dioxide, water vapor, and ash. These are entirely new substances that were not present in the original charcoal.
* Irreversible change: The burning process cannot be reversed to get the original charcoal back. Once burned, the charcoal is transformed into ash and gases.
* Energy is released: Burning is an exothermic reaction, meaning it releases heat and light energy. This energy change is a key indicator of a chemical change.
* Chemical bonds are broken and formed: The chemical bonds within the charcoal molecules are broken, and new bonds are formed with oxygen to create carbon dioxide and water.
Therefore, all these factors contribute to the conclusion that burning charcoal in a grill is a chemical change.
