53. why do real gases deviate from the ideal gas laws at low temperatures?
the volume occupied by molecules becomes a significant part of the total volume.
attractions between molecules cause a reduction in volume.
masses of individual particles increase as kinetic energy decreases.

The volume occupied by molecules becomes a significant part of the total volume.

Attractions between molecules cause a reduction in volume.  

Explanation:

C is wrong. The masses of molecules are constant.

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.