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