what do these two changes have in common? rust forming on a metal gate using polish to remove tarnish from a…

what do these two changes have in common? rust forming on a metal gate using polish to remove tarnish from a silver spoon select all that apply. both are only physical changes. both are chemical changes. both are caused by heating. both are caused by cooling.

what do these two changes have in common? rust forming on a metal gate using polish to remove tarnish from a silver spoon select all that apply. both are only physical changes. both are chemical changes. both are caused by heating. both are caused by cooling.

Answer

Brief Explanations:

Rust forming on a metal gate is a chemical reaction between iron in the metal and oxygen in the air, creating iron - oxide. Using polish to remove tarnish from a silver spoon involves a chemical reaction between the polish and the silver - sulfide (tarnish) on the spoon. Neither is a physical change, and neither is caused by heating or cooling.

Answer:

Both are chemical changes.