ll lle Ollule State as in minerals such as hematite (Fe203) and limonite (Lab 1)

Question

ll lle Ollule State as in minerals such as hematite (Fe203) and limonite (Lab 1). Organic acids, released by decomposing plants, increase the rate of rock weathering by increasing the rate at which metals such as Fe or Al are removed during weathering. Chemical weathering reactions of iron minerals As noted previously, pyroxene is an iron-bearing mineral found in igneous rocks such as basalt. Equation 1 represents a weathering reaction of the pyroxene to form hematite. 4 iron pyroxene + oxygen + 8 water 2 hematite + 4 dissolved silica (1) 4 FeSiO3(s) +02(g) + 8H20(i) 2 Fe,03(s) + 4 H,SiO4(aq) In the various equations employed in this exercise, the physical states of the different species in the reactions are given by the following subscripts s, ,, aq and g; these symbols indicate that the species are in solid, liquid, aqueous and gaseous states, respectively. 2

Explanation / Answer

Problem 2:

Since the reactants and products are of different states, it is a Heterogenous Reaction

Problem 3

Since the reaction leaves a residue (aqueous silica) it is an Incongruent Reaction

Problem 4:

Since the ratio of Pyroxene: hematite is 2:1, 0.5 moles of pyroxene will give 0.25 moles of hematite

Reactant species Physical State Stoichiometric coefficient Product Species Physical State Stoichiometric coefficient Iron pyroxene Solid 4 Hematite Solid 2 Oxygen Gas 1 Dissolved Silica Aqueous 4 Water Liquid 8

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