It is an open system; atoms can move into and out of the rock.
The make up is changed when the mineral composition undergo metamorphism.
The chemical composition is not changed during a physical process.
During frying the chemical composition is changed.
The composition of a chemical compound is not changed during a physical change.
During boiling the chemical composition is not changed.
During cooking the chemical composition of eggs is changed.
During cooking the chemical composition of eggs is changed.
The chemical composition was changed during frying.
The chemical composition of foods is changed during cooking.
During baking the chemical composition of the initial ingredients is changed.
During evaporation the chemical composition of water is not changed.
The chemical composition is changed during this process.