text: This element is used in the indicator electrode in polarography experiments, and it is found in namesake "drop electrodes" and "film electrodes" used as working electrodes in voltammetry experiments.
full_question: This element is used in the indicator electrode in polarography experiments, and it is found in namesake "drop electrodes" and "film electrodes" used as working electrodes in voltammetry experiments. Potassium mixed with a tetra-iodo anion con- taining this element is used in a reagent for detection of ammonia named for Nessler. This element mixed with sulfuric acid catalyzes the hydration of alkynes to form ketones. A saturated solution of this element's chloride dissolved in potassium chloride comprises a common reference electrode known as the saturated calomel electrode. Sodium borohydride is used to remove an acetate of this element in a reaction where an alkene is converted to an alcohol in a classic example of a Markovnikov addition. For 10 points, name this element found in amalgams and the ore cinnabar, a metal whose low freezing point makes it suited for usage in thermometers.
first_sentence: This element is used in the indicator electrode in polarography experiments, and it is found in namesake "drop electrodes" and "film electrodes" used as working electrodes in voltammetry experiments.
raw_answer: mercury [or Hg]