response to acid chemical Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a stimulus by the chemical structure of the anion portion of a dissociated acid (rather than the acid acting as a proton donor). The acid chemical may be in gaseous, liquid or solid form. GO:0001101 This term should be used to describe a response to a specific acid as a chemical. E.g., if an organism were responding to glutamate, then the response would be glutamate-specific; the organism is actually responding to the chemical structure of the anion portion of the dissociated acid. Note that this term is in the subset of terms that should not be used for direct gene product annotation. Instead, select a child term or, if no appropriate child term exists, please request a new term. Direct annotations to this term may be amended during annotation QC. If annotating experiments where an acid is playing a role as a proton donor, please annotate to GO:0010447 'response to acidic pH' instead. biological_process response to acid response to acid anion response to oxoanion response to chemical