physical and chemical changes

1. intro

1.1. all substances go under some changes

1.1.1. there are two kinds of changes

1.1.1.1. physical changes

1.1.1.1.1. definition

1.1.1.1.2. characteristics

1.1.1.1.3. experiment

1.1.1.1.4. example

1.1.1.2. chemical changes

1.1.1.2.1. definition

1.1.1.2.2. charecteristics

1.1.1.2.3. experiment

1.1.1.2.4. example