If you are looking for "features" in a laboratory setting (indicators that a reaction has occurred), they include: (bubbles or fizzing). Formation of a precipitate (solid forming in liquid). Change in temperature (exothermic or endothermic). Change in color or odor .
: Binary strings (1s and 0s) representing the presence or absence of specific substructures. chemicals
: Simple counts or calculated values such as: Molecular Weight : The mass of the molecule. If you are looking for "features" in a