> See also: > - [[Chemical Reactions]] > - [[Atomic & Molecular Orbitals]] # Chemical Bonds https://www.quora.com/What-is-special-about-covalent-C-H-bonds-so-that-it-stores-energy Chemical bonds do not “store energy” Some external energy must be given up Energy is released as a result of any chemical bond formation - The stronger the bond, the more energy that was given away when it was formed. High energy molecules are excited while lower energy molecules are relaxed - Relates back to the concept of HOMO-LUMO gaps ## Types of Bonds There are three types of chemical bonds: - Purely Covalent Bonds - Polar Covalent Bonds - Non-covalent bonds: - Ionic Bonds ![[Chemical Bonds.png|300]] ### Ionic Bonds Ionic bonds typically only occur between a metal and a nonmetal due to their drastic difference in [[electronegativity]]. ### Covalent Bonds ## Properties of Chemical Bonds - Bond Angle > [!NOTE] Water Molecule Bond Angles > 104.5 - Bond Length - **Bond Energy:** The energy required to break a chemical bond apart ### Bond Length vs Bond Energy The bond strength is dependent on the charge - As a bond’s strength grows higher, the two atoms are pulled closer together and the bond length is shortened as a result. ## Quantifying Strengths of Chemical Bonds **Bond Dissociation Energy (BDE):** aa - [[Chemical Energy]]