Sentences with phrase «oxidised iron»
The formula used unites all 3 laws of thermodynamics and is usually represented for a chemist or geochemist by the relation DeltaG = DeltaH (enthalpy)- T * Delta S Consider a reaction - C + 2Fe2O3 == 4FeO + CO2 On the left is elemental and reduced C (carbon) and ferric oxide (oxidised iron).
http://www.realclimate.org/
His formally rigorous constructions in oxidised iron — the material a reference point to the industrial past of the Basque region — are imbued with tension and poise.
The hydrogen floated off into space while the oxygen oxidised the iron - rich Martian topsoil, turning it rust - red.
Not exact matches
These reactions oxidise organic compounds and reduce the iron in the lake.
The biggest difference being, that Mars has more iron in its mantle rocks, as the planet formed under marginally more oxidising conditions.»
It is generally agreed that Mars's colour is the result of a black form of iron called magnetite oxidising into the reddish - orange form called haematite.
In the absence of iron, the remaining sulphur oxidises slowly and can be controlled with a stable climate and antioxidants.
The version of this plaster in the Barbara Hepworth Museum is marked with small rust spots; these are most likely to be flecks of iron in the plaster oxidising in the sea air rather than evidence of an armature.
The hydrogen was lost to space leaving highly reactive oxygen to combust reduced carbon (C and CH4) and sulphur (inc sulphide) to acid gases as well as oxidise near surface elemental or ferrous iron to ferric (red) iron.
The Earth's crust (2.2 * 10 ^ 25g) contains 8.3 % by mass of iron, not as FeII as one might expect on a primordial Earth but a mix with oxidised ferric.
Igneous and volcanic rocks have very low carbon and sulphur contents and reduced iron (FeII), the exhaled gases are oxidised, CO2 and SO2.
Similarly, iron which is far more abundant in the crust, thermodynamically and kinetically prefers to exist as ferric (Fe111) in our oxidising atmosphere unlike its ferrous form in the crust eg pyrite.