heterogeneousheterogeneous catalystheterogeneous mixtureheterogeneous reactionheterogenetyheterolytic cleavageheteronuclearheteropolar bondheteropoly acidheteropolyatomicheteropolymerhevea rubberhexagonhexagonalhexagonal systemhexonal zinc sulfide structurehexosehexoxidehfhghiding powerhigh boilinghigh grade petrolhigh polymerhigh resistancehigh resolutionhigh spinhigh temperaturehighest occupied molecular orbitalhight density polyethylenehindered rotationhohohlraumholmiumholoenzymeholohedralholohedronholosymmetrichomohomoatomic chainhomoatomic moleculehomochain polmerhomocyclic compoundshomogeneityhomogeneoushomogeneous catalysthomogeneous mixturehomogeneous reactionhomologous serieshomolysis