Which caused a change in matter. select each procedure that is likely a chemical change. salt crystals were crushed into a fine powder. bubbles were produced when iron was placed in acid. two liquids were combined, and a solid appeared. a piece of metal melted when it was heated. a white substance turned blue when water was added.

These 2 are physical changes:

Salt crystals were crushed into a fine powder.

A piece of metal melted when it was heated.

These are likely to be chemical changes:

Bubbles were produced when iron was placed in acid.

Two liquids were combined, and a solid appeared.

A white substance turned blue when water was added.

catya your not at all which answer i've seen you do this on another question!