Question

which of these is an example of a physical property?
sodium oxidizes in air.
table salt is a white crystal.
iron rusts when exposed to air.
potassium ignites when placed in water.

Explanation:

A physical property is a characteristic of a substance that can be observed or measured without changing the substance's chemical identity. Chemical properties describe how a substance reacts to form new substances.

• Sodium oxidizing, iron rusting, and potassium igniting are all chemical reactions that produce new substances, so these are chemical properties.
• The color and crystal structure of table salt are observable without altering its chemical composition, so this is a physical property.

Answer:

Table salt is a white crystal.