Determine whether each observation describes a chemical or a physical property 1. When a piece of Sodium metal is placed in a test tube with water, the Sodium fizzes and
bubbles of gas are produced.
2. When salt is added to water in a test tube, the salt dissolves.
3. When water is placed in a freezer at zero degree selcious it becomes ice.
4. When an iron bicycle is left outdoors and is exposed to moist air, it gets rusty.

chemical, physical, physical, chemical

Explanation:

both rust and bubbles are products of chemical change whilst freezing ad dissolving are physical.

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.

the atomic mass is the bottom number on the element.

-steel jelly