Question

How can you demostrate that matter is conserved in a physical change

Answer 1

The mass doesn't change

Step-by-step explanation:

Law of conservation of mass

If we put an ice cube in a reusable plastic bag and weigh it, after the ice cube melts, a physical change, the mass will stay the same.

Answer 2

weighing all the materials involved in an experiment before starting it, and again after the experiment