A) Acetone B) Carbon dioxide C) Methanol D) Water
A) Solid B) Liquid C) Supercritical D) Gas
A) Differences in solubility in the mobile phase B) Differences in boiling point C) Differences in conductivity D) Differences in molecular weight
A) Avoid solvent contamination B) Maintain supercritical conditions C) Enhance detector sensitivity D) Increase column temperature
A) Lower equipment cost B) Higher resolution C) Faster separation D) Limited application range
A) Enhances analyte solubility B) Stabilizes column efficiency C) Improves stationary phase selectivity D) Reduces detector interference
A) Critical point B) Near-critical region C) Transition zone D) Supercritical zone
A) Gas B) Liquid C) Solid D) Aqueous
A) Through exposure to light. B) By adding impurities. C) By altering its chemical composition. 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) At low pressures regardless of temperature. C) Only when both components have identical critical points. D) In all binary mixtures without exception.
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) By summing the critical points of each component. D) Using only the critical temperature of one 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 melting curve B) The critical point C) The density-pressure line D) The boiling curve
A) 500 K B) 300 K C) 273 K D) 735 K
A) It uses less energy to heat the water. B) It eliminates bubbles on electrodes, reducing ohmic losses. C) It increases the volume of hydrogen produced. D) It decreases the need for catalysts.
A) Supercritical conditions can only be achieved at low pressures. B) A continuous reaction system must be devised due to very short reaction times. C) Large amounts of water are needed to maintain the reaction. D) The process requires long reaction times to be effective.
A) 1.0 megapascal B) 12.0 megapascals C) 5.0 megapascals D) 9.3 megapascals
A) Benjamin Thompson B) Baron Charles Cagniard de la Tour C) James Prescott Joule D) Michael Faraday
A) O2, N2, Ar B) NH3, SO2, NOx C) H2, CH4, CO2, CO D) Neon, Krypton, Xenon
A) Aliphatic inter-ring linkages are cleaved into low molecular weight mixed phenols. B) Lignin forms a protective layer around polysaccharides. C) Lignin remains unchanged due to short reaction times. D) Lignin is completely converted into simple sugars.
A) Increased viscosity B) Enhanced conductivity C) Reduced density D) Antimicrobial properties
A) Rankine cycle B) Otto cycle C) The Allam cycle D) Brayton cycle
A) Pharmaceuticals B) Food science C) Cosmetics D) Microelectronics
A) The density becomes higher B) The density fluctuates unpredictably C) The density decreases significantly D) The density remains constant
A) 100–10000 nm B) 5–2000 nm C) 10–5000 µm D) 50–500 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) Alaska gas field D) Texas gas field
A) India B) China C) Japan D) South Korea
A) 3.4 MPa (34 bar) B) 14,000 MPa C) 570 MPa D) 7.38 MPa (73.8 bar)
A) Lower operational costs. B) Reduced radiation exposure. C) Similar thermal efficiency gains. D) Increased fuel availability.
A) Fermentation B) Oxidation C) Hydrogenation D) Transesterification
A) It speeds up the drying process significantly. B) It reduces the cost of materials used. C) It removes solvent without causing distortion due to surface tension. D) It enhances the mechanical strength of the aerogel.
A) Biomass gasification reactors. B) Supercritical fluid extraction equipment. C) CO2-based dry cleaning equipment. D) Hydrogen production facilities.
A) They eliminate the need for catalysts. B) Rapid diffusion accelerates diffusion-controlled reactions. C) They increase reaction time. D) They are cheaper than conventional solvents. |