Question

what do these two changes have in common? stapling an envelope shut using a large magnet to remove pieces of iron from a junkyard select all that apply. both are changes of state. both are only physical changes. both conserve mass. both are caused by cooling.

Explanation:

Stapling an envelope and using a magnet to pick up iron are physical changes. They don't change the chemical composition of substances, so mass is conserved. They are not changes of state (like melting[LLM SSE On Failure]

Answer:

Stapling an envelope and using a magnet to pick up iron are physical changes. They don't change the chemical composition of substances, so mass is conserved. They are not changes of state (like melting[LLM SSE On Failure]