A) Acetone B) Water C) Carbon dioxide D) Methanol
A) Supercritical B) Liquid C) Gas D) Solid
A) Differences in boiling point B) Differences in solubility in the mobile phase C) Differences in conductivity D) Differences in molecular weight
A) Avoid solvent contamination B) Maintain supercritical conditions C) Increase column temperature D) Enhance detector sensitivity
A) Limited application range B) Faster separation C) Higher resolution D) Lower equipment cost
A) Stabilizes column efficiency B) Reduces detector interference C) Improves stationary phase selectivity D) Enhances analyte solubility
A) Supercritical zone B) Transition zone C) Critical point D) Near-critical region
A) Solid B) Gas C) Aqueous D) Liquid
A) By altering its chemical composition. B) Through exposure to light. C) By adding impurities. D) By changing the pressure and temperature, allowing fine-tuning between liquid-like and gas-like states.
A) When one component is much more volatile than the other, at high pressure and temperatures above the component critical points. B) In all binary mixtures without exception. C) Only when both components have identical critical points. D) At low pressures regardless of temperature.
A) Using only the critical temperature of one component. B) By summing the critical points of each component. C) As the arithmetic mean of the critical temperatures and pressures of the two components. D) It cannot be estimated; it must always be measured experimentally.
A) Through direct measurement at all possible pressures and temperatures. B) Using only empirical observations without calculations. C) By averaging the boiling points of the components. D) Equations of state, such as the Peng–Robinson or group-contribution methods.
A) The melting curve B) The critical point C) The density-pressure line D) The boiling curve
A) 735 K B) 273 K C) 500 K D) 300 K
A) It uses less energy to heat the water. B) It decreases the need for catalysts. C) It eliminates bubbles on electrodes, reducing ohmic losses. D) It increases the volume of hydrogen produced.
A) Large amounts of water are needed to maintain the reaction. B) A continuous reaction system must be devised due to very short reaction times. C) The process requires long reaction times to be effective. D) Supercritical conditions can only be achieved at low pressures.
A) 12.0 megapascals B) 5.0 megapascals C) 9.3 megapascals D) 1.0 megapascal
A) Michael Faraday B) Benjamin Thompson C) Baron Charles Cagniard de la Tour D) James Prescott Joule
A) Neon, Krypton, Xenon B) NH3, SO2, NOx C) H2, CH4, CO2, CO D) O2, N2, Ar
A) Aliphatic inter-ring linkages are cleaved into low molecular weight mixed phenols. B) Lignin is completely converted into simple sugars. C) Lignin remains unchanged due to short reaction times. D) Lignin forms a protective layer around polysaccharides.
A) Increased viscosity B) Enhanced conductivity C) Antimicrobial properties D) Reduced density
A) Rankine cycle B) Brayton cycle C) The Allam cycle D) Otto cycle
A) Microelectronics B) Cosmetics C) Pharmaceuticals D) Food science
A) The density decreases significantly B) The density fluctuates unpredictably C) The density becomes higher D) The density remains constant
A) 5–2000 nm B) 100–10000 nm C) 50–500 nm D) 10–5000 µm
A) 570 MPa B) 40 bar C) 3.4 MPa (34 bar) D) 7.38 MPa (73.8 bar)
A) North Sea gas field B) Sleipner gas field C) Alaska gas field D) Texas gas field
A) Japan B) India C) South Korea D) China
A) 570 MPa B) 14,000 MPa C) 3.4 MPa (34 bar) D) 7.38 MPa (73.8 bar)
A) Increased fuel availability. B) Similar thermal efficiency gains. C) Reduced radiation exposure. D) Lower operational costs.
A) Hydrogenation B) Transesterification C) Oxidation D) Fermentation
A) It enhances the mechanical strength of the aerogel. B) It speeds up the drying process significantly. C) It reduces the cost of materials used. D) It removes solvent without causing distortion due to surface tension.
A) Supercritical fluid extraction equipment. B) Biomass gasification reactors. C) Hydrogen production facilities. D) CO2-based dry cleaning equipment.
A) They are cheaper than conventional solvents. B) They eliminate the need for catalysts. C) They increase reaction time. D) Rapid diffusion accelerates diffusion-controlled reactions. |