CHM135H1 Chapter Notes - Chapter 10: Ideal Gas Law, Molar Volume, Molar Mass
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CHM135H1 Full Course Notes
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Document Summary
Most things are solids: substances whose constituent atoms, molecules, or ions are held rigidly together in definite way, giving definite volume and shape. Other substances are liquids: constituent atoms or molecules held together less strongly, giving definite volume but changeable and indefinite shape. Other substances are gases: constituent atoms or molecules have little attraction for one another and, free to move around in whatever volume is available. Gas mixtures are always homogenous (uniform in composition) Homogenous mixing and compressibility occur because constituent particles are far apart. Mixing occurs because individual gas particles have little interaction with neighbours, so the chemical identity of neighbours is irrelevant. Compressibility possible because less than 0. 1% volume of a typical gas is taken up by particles themselves under normal circumstances; remaining 99. 9% is empty space. Gases exert measureable pressure on walls of container. Pressure (p): is defined as a force (f) exerted per unit area (a)
