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SECTION Section Check 12.2 SECTION 12.3 Liquids and Solids Which of the following molecules can form hydrogen bonds? ⢠Contrast the arrangement of particles in liquids and solids. A. CO2 ⢠Describe the factors that affect viscosity. B. C2H6 ⢠Explain how the unit cell and crystal lattice are related. C. NH3 D. H2 meniscus: the curved surface of a column of liquid SECTION Liquids and Solids 12.3 SECTION 12.3 Liquids and Solids Liquids viscosity unit cell surface tension allotrope surfactant amorphous solid crystalline solid The particles in solids and liquids have a limited range of motion and are not easily compressed. ⢠Forces of attraction keep molecules closely packed in a fixed volume, but not in a fixed position. ⢠Liquids are much denser than gases because of the stronger intermolecular forces holding the particles together. ⢠Large amounts of pressure must be applied to compress liquids to very small amounts. 8
