Question

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.

Answer 1

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.

Answer 2

Procedures that are likely a chemical change are:

- 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.