Sagot :
Answer:
1.Pure substances are substances that are made up of only one kind of particles and has a fixed or constant structure.
2. Characteristic/Properties of Pure Substances are;
Pure substances are mostly homogeneous in nature containing only one type of atoms or molecules.
These substances mainly have a constant or uniform composition throughout.
The substances have fixed boiling and melting points.
A pure substance usually participates in a chemical reaction to form predictable products.
3. Appearance : all one color. because it has the same appearance and properties
Melting Point: is the temperature at which the substance changes from a solid to a liquid. For a pure substance, melting occurs at a single temperature.
Boiling Point: is the temperature at which the substance transitions from a liquid to the gaseous phase