Introduction to States of Matter and State Changes

The video explains the three main states of matter, which are solids, liquids and gases, and their properties. The concept of state symbols is introduced to indicate what state chemicals or particles are in a reaction. The video also discusses the physical process of changing the state of a substance, which involves overcoming the attractive forces between particles using energy. The video also covers melting point, boiling point, freezing point, sublimation and deposition. Lastly, the video explains that the changes in state are reversible physical processes, and that no new substances are created.