A chemical reaction (signs)
- rusting
- change in base of chemical
- for example lets say u mix two chemicals, and then it becomes a different new chemical (it changed from the inside)
a physical
- a physical reaction is outer looks not inside.
- it changes on the outside, like changing a color
I'm sorry but the picture isn't clear enough
b. o2
oxygen is diatomic because 1 molecule is made of 2 atoms of oxygen
