Physical Chemical Changes G7

Everything that is present our environment goes through some kind of a change. Some changes are permanent, while some are temporary. For example – Water when freezes below 0° C, changes to ice, but turns back to water when heated. This change is temporary and physical. On the other hand, an iron rod when exposed to air gets rusted. This change is permanent, and chemical. Have more questions about this? Click on the start button and get your answers.