Intermolecular forces IMF intramolecular forces 1 Dipoledipole force





























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Intermolecular forces) IMF) : แรงดงดดระหวางโมเลกลทเปนของแขงหรอของเหลว : เปนแรงทออนกวา แรงภายในโมเลกล (intramolecular forces ) หรอ พนธะเคม (. 1 Dipole-dipole force. 2 Dipole-induced dipole force รวมเรยกวา Van der Waals force. 3 Dispersion force. 4 Ion-dipole force. 5 Ion-induced dipole force หมายเหต Hydrogen bond เปน dipole-dipole force ชนดพเศษ 2







ถา intermolecular force สง สงผลให surface tension สง -intermolecular attraction ระหวางโมเลกลเหมอนกน = Cohesion - intermolecular attraction ระหวางโมเลกลตางกน = Adhesion ตวอยางผลของ surface tension, cohesion / adhesion ในหลอด capillary ดงรป (a) adhesion < cohesion )b) adhesion < cohesion (a) (b) 9


ของเหลว glycerol H 2 O C 2 H 5 OH Blood 4. 00 viscosity (N. s/m 2 ( 1. 49 1. 01 10 -3 1. 20 10 -3 เกด H-bond มาก ดงนน viscosity สงมาก Glycerin 11



ชนดของ Unit cell ม 7 ชนด แบงยอยรวมได 14 แบบ คอ Cubic. 1 Simple cubic (SC(. 2 Body - centered cubic (BCC(. 3 Face - centered cubic (FCC( Tetragonal. 4 Simple. 5 Body - centered Orthorhombic. 6 Simple. 7 Body - centered. 8 End - centered. 9 Face - centered 14

ชนดของ Unit cell )ตอ ( Rhombohedral. 10 Monoclinic. 11. 12 Triclinic. 13 Hexagonal. 14 Rhombohedral Simple End - centered Triclinic Hexagonal 15














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