All of the following statements about liquids and gases are true except: Liquids are much more difficult to compress into a smaller volume than are gases

Liquids are fluids but gases are not

Molecules in a liquid are much more closely packed than molecules in a gas

Molecules in a liquid can vibrate and rotate, but they cannot move about as freely as molecules in a gas

50.23 i believe is correct but don't quote me on that.

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.