chemical reaction;  generation of an unexpected result from combining things
 chemical substances;  chemicals
 synthetic fiber;  synthetic fibre;  chemical fiber;  chemical fibre
 chemical experiment;  chemistry experiment
 chemical fertilizer;  chemical fertiliser
 chemical seasoning (esp. monosodium glutamate)
 chemistry laboratory;  chemical laboratory
 chemical plant;  chemical factory;  chemical works
 chemical symbols (for the elements)
 chemical composition;  chemical component
 chemical structure;  chemical constitution
 from the chemical point of view
 chemical structural formula
 chemical protective clothing;  hazmat suit
 cosmo-chemistry;  space science
 computational chemistry (i.e. computer simulation of chemical phenomena);  computer chemistry
 femtosecond chemistry;  femtochemistry
 chemical oceanography;  marine chemistry
 oleochemistry;  oil and fat chemistry