Quick Quiz: Nouns Score: Change category, Flip order Reset Incorrect! Try again. Noun: chemical element Your choice? adsorption (especially when irreversible) by means of chemical instead of physical forces adsorption (especially when irreversible) by means of chemical instead of physical forces  (Noun: chemosorption) any low-fusing alloy used in cheoplasty (molding artificial teeth) any of the more than 100 known substances (of which 93 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter