BIO 103 Lecture Notes - Lecture 6: Covalent Bond, Ionic Bonding, Hydrogen Bond

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Molecule: two or more atoms held together by chemical bonds: example: water. Water molecule: two hydrogen atoms covalently bonded to one oxygen atom. Covalent bond: two atoms share a pair of electrons. Covalent bond: two atoms share a pair of electrons: strong, stable bond. Properties of water: water is a polar molecule: Moderating temperature: water is a good solvent. Water can dissolve salts and hydrophilic (water loving) molecules because it is polar. Nacl has an ionic bond = attraction between positive and negative charged ions. Ionic bond: attraction between positive and negative charged ions, strong and stable out of water, dissolves in water. Due to its polarity, water is a good solvent. Solvent: a liquid in which another substance is dissolved. Water: allows contact between solutes for chemical reaction. Chemical reactions: changes in chemical composition of substances. Reactant a + reactant b = product: h20 + h+ = h30, cohesion = tendency of molecules to stick together.

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