Based on the information given, the soft, silvery-white metal is undergoing a chemical reaction with the yellow gas to produce a white crystal-like solid. This suggests a chemical change has occurred.
This change could be a chemical reaction between the soft, silvery-white metal and the yellow gas, resulting in the formation of a white crystal-like solid. Chemical reactions involve the rearrangement of atoms, leading to the formation of new substances with different physical and chemical properties. In this case, the metal and the gas have combined to form a new solid compound.
