A bubble of radon gas has a volume of 0.6500ml near the bottom of a large aquarium where the pressure is 1.540 and the temperature is 12.0°c determin bubles volume upom rising to the top where pressure is 1.010 atm and the temperature is 16.0°c

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.