Physical and Chemical Change

1. Matter changes with the season, including changes in the color of leaves and in the temperature of the air.

2. Matter can change in many ways, including physical changes and chemical changes.

1. In a physical change, the identity of the substance does not change.

2. Dissolving one substance in another does not change the identities of the substances.

3. The formation of ice on the surface of a lake is an example of a(n) change in state

4. Changes in state involve changes in the amount of energy that the particles in a substance have.

5. The rate at which one state of matter changes into another depends on how much energy is added or taken away from the substance.

Dmitri Mendeleev – mid 1800’s -proposed a table for 70 elements based on increasing mass and similar properties 

Henry Moseley – 1913 -determined the atomic number of elements and arranged the table in order of increasing atomic number

Characteristics: - in the upper-right corner of the periodic table