Question

what do these two changes have in common? using polish to remove tarnish from a silver spoon using a large magnet to remove pieces of iron from a junkyard select all that apply. both are chemical changes. both are changes of state. both conserve mass. both are only physical changes.

Explanation:

Removing tarnish from a silver spoon with polish is a physical - cleaning process that doesn't change the chemical composition of silver. Using a magnet to remove iron pieces is a physical separation based on magnetic properties. In all physical and chemical changes, mass is conserved according to the law of conservation of mass. These are not chemical changes or changes of state (like melting, boiling etc.).

Answer:

C. Both conserve mass., D. Both are only physical changes.