Question

identify four unique characteristics of compounds.

Explanation:

Compounds are substances made of two or more different elements chemically combined in a fixed ratio. They have distinct chemical and physical properties different from their constituent elements. Some key characteristics include definite composition, unique chemical properties, fixed melting and boiling points, and can only be separated into elements by chemical means.

Answer:

1. Definite composition (fixed ratio of elements).
2. Unique chemical properties (different from constituent elements).
3. Fixed melting and boiling points.
4. Can only be separated into elements by chemical means.