John Dalton, Ernest Rutherford, and J. J. Thomson all contributed to our understanding of the atom. Choose one of the scientists listed above and explain his contribution to our current understanding of atomic theory and/ or atomic models. You need at least 4 distinct facts about the scientist. You should include information about: specific experiments done by the scientist

discoveries that were made

theories that were developed

models that were proposed

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.

the correct answer to this question is 2

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.