Is sublimation a chemical or physical change?
It is a physical change. See explanation.
A chemical change (reaction) is a process after which a new substance (one or more) is created. For example:
In this process (reaction) from 2 particles: acid (
In a physical change NO new substances are formed.
After sublimation a solid changes to a gas, but it is still the same substance. Only the state of matter has changed.