chap4puresubstances

chap4puresubstances - Chapter 4 Properties of pure...

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1 Chapter 4 Properties of pure substances Pure substance: A substance that has a fixed chemical composition throughout is called a pure substance. Ex: water, nitrogen, helium and carbon dioxide. Figure 4.1 Nitrogen and gaseous air are pure substances. Figure 4.2 A mixture of liquid and gaseous water is a pure substance, but a mixture of liquid and gaseous air is not. Figure 4.1 Nitrogen and gaseous air are pure substances. Figure 4.2 A mixture of liquid and gaseous water is a pure substance, but a mixture of liquid and gaseous air is not. 4.2 Phases of a pure substance Figure 4.3 The molecules in a solid are kept at their positions by the large spring like intermolecular forces.
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2 Figure 4.5 The arrangement of atoms in different phases: ( a ) molecules are at relatively fixed positions in a solid, ( b ) groups of molecules move about each other in the liquid phase, and ( c ) molecules move about at random in the gas phase. Solid, Liquid, Gas 4.3 Phase-change processes of pure substances Figure 4.6 At 1 atm and 20°C, water exists in the liquid phase ( compressed liquid ). Compressed Liquid (Subcooled liquid): If the temperature of the liquid is less than the saturation temperature for the given pressure.
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3 Figure 4.7 At 1 atm pressure and 100°C, water exists as a liquid that is ready to vaporize ( saturated liquid ). Saturated liquid: A liquid that is about to vaporize is
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chap4puresubstances - Chapter 4 Properties of pure...

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