Final answer:
Pouring milk on oatmeal and dry ice sublimating both involve chemical bonds breaking, are changes of state, and conserve mass.
Step-by-step explanation:
Both involve chemical bonds breaking. Pouring milk on oatmeal involves the breaking of chemical bonds in milk, which causes it to spread and mix with the oatmeal. Similarly, dry ice sublimating and becoming a gas involves the breaking of chemical bonds within the solid carbon dioxide, resulting in the release of carbon dioxide gas.
Both are changes of state. Pouring milk on oatmeal is a change of state from liquid to a mixture. Dry ice sublimating is a change of state from solid to gas without passing through the liquid phase.
Both do not result in a different type of molecule than was there before, as milk and carbon dioxide remain the same molecules. However, both conserve mass as the total mass of the system does not change during these processes.
Learn more about Chemical changes in state