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GEOCHEMISTRY
The chemical processes taking place in the crust are especially important as they have build ores, concentrated mineral deposits that are exploited industrially as sources of specific components and their elements. Summarizes the principal chemical forms in which each element perform. At least half the elements prepare in the crust as oxides (mostly complex ones such as silicates) or less commonly as halides, and are called lithophiles. All the bigger electropositive metals are in this class. Chalcophiles are components present in sulfide minerals; these include some elements chemically same to sulfur (As, Se) together with less electropositive metals of the later post transition and transition metal groups.
Fig. 1. The periodic table showing the principal types of chemical compound occurring for elements at the Earth's surface.
For a general reaction such as: The equilibrium constant is where the terms [A], [B],...strictly represent activities but are frequently approximated as co
what mass of oxygen gas exerts a pressure of 475 mm Hg in a volume of 1.25L at a temperature of -22C
Bond enthalpies The most straightforward measure of the strength of a bond is the energy needed to break it. Estimates of such bond energies are usually obtained from thermo c
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Uses of Oxalic acid or Polyprotic acid (i) Oxalic acid is used in the manufacture of carbon monoxide, formic acid and allyl alcohol. (b) Oxalic acid is used as a laboratory
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