Introduction to chemical reactions

The first six models of this chemistry course are dealing with substances and their properties, but from now on, starting with this module 7, its about how these substances and their properties can change.
In a chemical reaction you have reactants forming products, i.e. new substances with new properties.
Many times, physical changes, like evaporation, are calles temporarily; chemical changes, like in reactions, are remaining.
But attention: the difference between physical and chemical is not always easy.
The topics of this module: behaviour of particles at a chemical reaction, the reaction equation, reaction calculations, energy and energy diagrammes, reaction rate and the different types of reactions.