If the pressure of a sample of gas is doubled at constant temperature what happens to the volume of the gas

The volume of the gas has decreased by 1/2.

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.