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A gas can be liquefied by ________.
low pressure and high temperature
low pressure and low temperature
high pressure and low temperature
high pressure and high temperature
high pressure and low temperature
A gas can be liquefied by applying high pressure and lowering the temperature. These conditions are necessary to minimize the kinetic energy of gas molecules and increase intermolecular forces, allowing them to overcome their random motion and coalesce into a liquid state.
A gas can be liquefied by applying high pressure and lowering the temperature. These conditions are necessary to minimize the kinetic energy of gas molecules and increase intermolecular forces, allowing them to overcome their random motion and coalesce into a liquid state.
Think of a gas like a crowded room of energetic dancers; if you dim the music (lower temperature) to make them move slower and then squeeze the walls inward (high pressure), they will inevitably bump into each other and 'clump' together into a group (liquid).
P.T. L.H. (Pressure Top/High, Temperature Low/Low) = Liquid.
PV=nRT тАФ The Ideal Gas Law showing relationship between pressure, volume, and temperature.
FattractionтАЛтИЭr61тАЛ тАФ Van der Waals force dependence on inter-molecular distance r.
The kinetic molecular theory states that gas particles move randomly with high kinetic energy. By increasing pressure, we force molecules closer together, reducing the volume occupied. By decreasing temperature, we reduce their average kinetic energy, ensuring that attractive intermolecular forces (Van der Waals forces) can effectively bind the molecules together to transition the gas into a liquid phase.
Liquefaction requires decreasing kinetic energy (Cooling).
Liquefaction requires increasing intermolecular proximity (Compression).
Gases deviate from ideal behavior most significantly at high pressure and low temperature.
Facilitates efficient transport and storage of gases in containers.
Energy-intensive process requiring heavy cryogenic equipment.
Storage of LPG (Liquefied Petroleum Gas) in cylinders.
Cryogenic industry for storage of liquid Oxygen, Nitrogen, and Helium.
The critical temperature is the temperature above which a gas cannot be liquefied, regardless of pressure.
Option A is wrong because high temperature increases molecular kinetic energy, opposing liquefaction.
C is correct тАФ A gas can be liquefied by applying high pressure and lowering the temperature.
Remember: Molecules need to be 'slow and close' to bond as a liquid. High pressure makes them close; low temperature makes them slow.
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