the tangible substance that goes into the makeup of a physical object

of or made from or using substances produced by or used in reactions involving atomic or molecular changes

of or relating to or produced by chemical reactions at high temperatures

of or made from or using substances produced by or used in reactions involving atomic or molecular changes

a chemical substance that undergoes a rapid chemical change (with the production of gas) on being heated or struck

a chemical substance that is present at the start of a chemical reaction

a chemical sprayed on fruit trees to regulate their growth so the entire crop can be harvested at one time

an inactive substance that is a vehicle for a radioactive tracer of the same substance and that assists in its recovery after some chemical reaction

any chemical agent that destroys bacteria