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Whether a reaction actually will go in the arbitrarily selected forward direction or not depends on the amounts of the substances present at any given time, which determines the kinetics and thermodynamics, i.e., whether equilibrium lies to the right or the left. k occur whenever the first of the reactants is depleted for the forward reaction; or the first of the "products" is depleted if the reaction as viewed as being pushed in the reverse direction.This is a purely kinematic restriction on the reaction simplex, a hyperplane in composition space, or N?space, whose dimensionality equals the number of linearly-independent chemical reactions.This is necessarily less than the number of chemical components, since each reaction manifests a relation between at least two chemicals.Chemical composition, also known as chemical makeup or simply, composition, is a concept in chemistry that has different, but similar, meanings if referred to a single pure substance or a mixture.

The localized deposits of metal ores near the surface which can be extracted economically by humans are non-renewable in human time-frames.

This means that if the amounts of the separate reactants are known, then the amount of the product can be calculated.

Conversely, if one reactant has a known quantity and the quantity of product can be empirically determined, then the amount of the other reactants can also be calculated.

Earth minerals and metal ores, fossil fuels (coal, petroleum, natural gas) and groundwater in certain aquifers are all considered non-renewable resources, though individual elements are almost always conserved.

In contrast, resources such as timber (when harvested sustainably) and wind (used to power energy conversion systems) are considered renewable resources, largely because their localized replenishment can occur within time frames meaningful to humans.

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