* Breaking Bonds: When reactants (starting materials) collide with enough energy, existing bonds between atoms can be broken. This requires energy input, often in the form of heat or light.
* Forming Bonds: As bonds break, atoms rearrange and form new bonds with different atoms, creating products (the resulting substances). This process often releases energy, making the reaction exothermic.
Here's a simple analogy:
Imagine building a Lego structure. You have individual pieces (atoms) that you can connect to form larger structures (molecules).
* Breaking bonds: Taking apart the structure involves breaking the connections between the Lego pieces (breaking bonds).
* Forming bonds: Building a new structure involves connecting the pieces in a different way (forming new bonds).
Key points:
* Chemical reactions involve changes in the arrangement of atoms.
* The energy required to break bonds is usually different from the energy released when new bonds form. This difference in energy is what determines whether a reaction is exothermic (releases heat) or endothermic (absorbs heat).
* Not all collisions between molecules result in a reaction. The molecules need enough energy and the correct orientation for the bonds to break and reform.
In summary, chemical reactions are fundamentally about the breaking and forming of chemical bonds. This process involves energy changes, and the rearrangement of atoms to create new substances.
