Question

Chemicals :D

Answer 1

Sorry, not very good at biology. But I know that if you were to put viniger and baking soda together it would cause an explosion. That would be a chemical change. If you crushed a can with your foot, that would be a physical change.

Answer 2

i thought it was about computer science ;)
but anyway, by common sense, physical change would be defined as change of state or structure of an object/material being this liquid, gas or solid
chemical change is change of chemical composure of the material of an object, it happens in atomic and molecular level
the exemples are> physical, vapouration of water, braking glass, melting ice, freezing water and you can come up with many more
chemical> adding salt to water, adding sugar to water, basically everything you do to water hehe
a method that can be used to asses the change (always by common sense) is to see if the material or object is of a different structure, and to see if it is chemical they have to look at the chemical level through one of the many detectors of certain chemical properties

Answer 3

thank you