Technology

In science we have been learning about chemical and physical changes. A chemical change is when you add a molecule with another molecule but you can't reverse it back to get the original substance. A physical change is when something can be done to something but then reversed. An example would be if you put salt into water and the salt would dissolve, but if you dried it out the salt would come back. This link is an image of a chemical reaction This is another link to a video explaining what a chemical and physical reaction is. https://www.youtube.com/watch?v=4ZGULLWEy1c