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