Are the properties determined without changing the identity of the substance yes or no

Endeleev saw trends in the physical and chemical properties of elements when he organized them by

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

One way that radioactive waste is treated is by burying it in repositories. the repositories are found only in states with very low populations. true or false? a. trueb. false(also i meant to put high school but it put down middle school instead)