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van der Waals forces attraction between positive and negative regions pull on molecules and hold them together polar molecules have oppositely charged regions, due to an unequal distribution of electrons hydrogen bond is a weak interaction involving a hydrogen atom and a fluorine, oxygen, or nitrogen atom mixture combination of tow or more substances in which each substance retains its individual characteristics and properties solution is another name for a homogeneous mixture solvent is a substance in which another substance is dissolved solute is the substance that is dissolved in the solvent acids substances that release hydrogen (H+) ions when dissolved in water bases substances that release hydroxide (OH-) ions when dissolved in water pH the measure of concentration of hydrogen (H+) in a solution buffers are mixtures that can react with acids or bases to keep pH within a particular range macromolecules large molecules that are formed by joining smaller organic molecules together polymer molecules made from repeating units of identical or nearly identical compounds called monomers that linked together by a series of covalent bonds carbohydrates compounds composed of carbon, hydrogen, and oxygen in the ratio of 1:2:1 (CHO) lipids molecules made mostly of carbon and hydrogen that make up fats, oils, and waxes protein is a compound made of small carbon compounds called amino acids amino acids small compounds that is are made of carbon, nitrogen, oxygen hydrogen, and sometimes sulfur nucleic acids complex macromolecules that store and transmit genetic information nucleotides smaller repeating subunits that make up nucleic acids basic Chemistry and how it has to do with Biology