A solid carbon dioxide sample transforms to gaseous state in a closed container at room temperature. As a result, what will the sample undergo

The mass has escaped into a gas which you can not see so the law stays true.

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.

Anions are negative charged ions