redox is a change in which one or more new substance are formed.
redox is a change in which one or more new substance are formed.
a change in which one or more new substance are formed?
redox
chemical change









































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.
chemical change
to fully characterize the physical world, the stoics developed a theory of mixing in which they recognised three types of mixture. the first type was a purely mechanical mixture such as mixing barley and wheat grains together: the individual components maintain their own properties, and they can be separated again. the second type was a fusion, whereby a new substance is created leading to the loss of the properties of the individual components, this roughly corresponds to the modern concept of a chemical change. the third type was a commingling, or total blending: there is complete interpenetration of the components down to the infinitesimal, but each component maintains its own properties. in this third type of mixture a new substance is created, but since it still has the qualities of the two original substances, it is possible to extract them again. in the words of chrysippus: "there is nothing to prevent one drop of wine from mixing with the whole ocean". ancient critics often regarded this type of mixing as paradoxical since it apparently implied that each constituent substance be the receptacle of each other. however to the stoics, the "pneuma" is like a force, a continuous field interpenetrating matter and spreading through all of space.
stoic physics