Lesson 2

What are physical properties of matter?

They are used to describe a substance.

A characteristic of a substance that can be observed and measured without changing the identity of the substance is called a physical property. For example: color , shape, seize, and texture.

Common Physical Properties:

Density: is a measure of the amount of mass in a given amount of volume.

Electrical conductivity: is a measure of how well an electric current can move through a substance.

Solubility:  is the ability of substance to disolve in another substance.

Maleability : is the ability of a substance to be rolled or pounded into various shapes.

Melting Point: the melting point of a substance is the temperature at wich it changes from a solid to a liquid.

What are chemical properties of matter?

A Chemical property describes a substance's ability to change into a new substance with different properties. They describe how a substance changes and they can be observed only as the identity of a substance changes. For example: Ripening is a chemical property 

What's the difference between physical and chemical properties?

   A physical property can be observed without changing the identity of a substance, for example: determining the mass of the substance does not change its identity. And a chemical property can be observed only by changing the identity of a substance., for example :flammability and reactivity.