Atoms are held together by the electrostatic force between the nucleus and electrons. Two atoms in a covalent bond are held together by the electrostatic force between the nuclei of the atoms and the shared electrons in the inter nuclear space. Molecules attract one another by the electrostatic force between induced dipoles (Van der Waals attraction), permanent dipoles (dipole-dipole attraction), or hydrogen bonding, where the positive end of the dipole is a hydrogen atom).
Intermolecular forces or metallic bonding derive from electrostatic force. Electrostatic force holds the particles of a substance together in a condensed phase of matter (solid or liquid).
In a liquid solution, electrostatic forces hold together the solvent and solute. In biochemistry, the structure of a large macromolecule such as a protein, is determined by a complex interplay of electrostatic forces between the functional groups of the molecule, within the molecule itself, with associated molecules, and with the aqueous solvent. Everything you are learning about electricity in physics is preparing you to understand chemistry.
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