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 change as it just removes the tarnish layer without changing the chemical composition of silver. Using a magnet to remove iron pieces is also a physical change as it is just a separation process based on magnetic properties. According to the law of conservation of mass, all physical and chemical changes conserve mass. These are not chemical changes or changes of state.

Answer:

Both conserve mass., Both are only physical changes.