a soft, silvery - white metal combines with a yellow gas to form a white crystal - like solid. what can be…

a soft, silvery - white metal combines with a yellow gas to form a white crystal - like solid. what can be said about this change?\nthe change is a physical change because the yellow gas changed into a solid.\nthe change is a physical change because a new substance was not formed.\nthe change is not a physical change because the color of the metal changed.\nthe change is not a physical change because a new substance was formed.

a soft, silvery - white metal combines with a yellow gas to form a white crystal - like solid. what can be said about this change?\nthe change is a physical change because the yellow gas changed into a solid.\nthe change is a physical change because a new substance was not formed.\nthe change is not a physical change because the color of the metal changed.\nthe change is not a physical change because a new substance was formed.

Answer

Brief Explanations:

A physical change involves a change in physical state (e.g., gas to solid) without forming a new substance. A chemical change forms a new substance. Here, a metal combines with a gas to form a new solid (a new substance), so it is a chemical change (not a physical change).

  • Option 1: Just changing state (gas to solid) is physical, but here a new substance is formed, so this is wrong.
  • Option 2: A new substance is formed (the white crystal - like solid), so this is wrong.
  • Option 3: Color change alone is not the key factor. The formation of a new substance is.
  • Option 4: Correct as a new substance is formed, so it is not a physical change.

Answer:

The change is not a physical change because a new substance was formed.