The table below shows the fossils found in various layers of an undisturbed rock: fossils in rock layers layer (from top) fossil in layer 1 a, c 2 e 3 a, d, f 4 b 5 f, c 6 d, b which is most likely an index fossil?

d.) the average kinetic energy of the gas particles is greater in container b because its particles move faster.

fe 55.85 g/mol and h2o 18.02 g/mol.

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.