Answer :

A soft, silvery-white metal combines with a yellow gas to form a white crystal-like solid. this change is chemical change.

A chemical change is a change when substance combines with the another substance and form a new substance. when there is complete change in the molecular composition and a new product is formed then it is said to be a chemical change.  A physical change is a change when there will be no new product form. and their will be no change in their chemical identities.

Thus, A soft, silvery-white metal combines with a yellow gas to form a white crystal-like solid. this change is chemical change.

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