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