What is a substance that cannot be broken down further by chemical means

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !

Which are examples of how technology has advanced scientific understanding.1using hot water to sterilize medical equipment.2transplanting a human organ into another individual.3inserting genes from one sheep into another cell to make a cloneunderstanding the different structures that make up a cell.4examining microorganisms from the deepest parts of the ocean

Word equation for k(s) +h2o(l) yield koh (aq) + h2