(a) With the aid of a phase diagram, explain what is meant by a supercritical fluid. Give...
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(a) With the aid of a phase diagram, explain what is meant by a supercritical fluid. Give examples of commercial processes that involve the use of supercritical fluids.
(b) Even though CO2 is classified as a ‘greenhouse gas’ (see Box 14.7), why is the use of supercritical CO2 regarded as being environmentally friendly?
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ENVIRONMENT Box 14.7 'Greenhouse gases Carbon dioxide normally constitutes 20.04% by volume of the Earth's atmosphere, from which it is removed and returned according to the carbon cycle: Living green-plant material Plants consumed as food Photosynthesis Metabolism + Wood fires Decay of dead plant material Herbivores and carnivores Respiration CO₂ Combustion Fossil fuels peat, coal, oil, natural gas = CO₂ taken up into seawater Weathering and industrial processes (e.g. see Fig. 11.7) Calcareous (e.g. shells) material is produced CaCO, as limestone, marble and chalk
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a Supercritical Fluids A supercritical fluid is a state of matter that exists above its critical temperature and critical pressure The critical temperature Tc is the highest temperature at which the s...View the full answer
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