separatory funnelseptetseptumsequence rulesequestering agentsetsewage purificationsfcshadeshakershaking bathshared electronsshavingsshear displacementsshear modulusshear thickeningshear thinningshear viscosityshellshell structureshieldedshielding constantshielding effectshielding parametershielding regionshift reagentshockproofshort necked flaskshrinkagesiside chainside chain substitutionside groupside reactionsievesieve analysicsieve brushsieve funnelsieve tubesievingsieving testsigma complexsignalsignificant figuresilanesilicate of sodasiliconsilicon hydridesiliconesilver