Question

Is sublimation a chemical or physical change?

Answer 1

It is a physical change. See explanation.

Explanation:

A chemical change (reaction) is a process after which a new substance (one or more) is created. For example:

`HCl+NaOH -> NaCl + H_2O`

In this process (reaction) from 2 particles: acid (`HCl`) and a hydroxide (`NaOH`) another 2 substances: salt (`NaCl`) and water
(`H_2O`) are formed.

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.