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Unformatted text preview: States of matter: Fixed shape Fixed position Variable shape Some molecular movement Variable shape & volume Fast molecular movement The state of matter has a dramatic effect on the outcome The stuff of chapter 8. Section 7.4 Section 7.5 Force between like molecules Result in: viscosity and surface tension Cohesive Force Adhesive Forces Force between unlike molecules Result in: meniscus Section 7.5 Viscosity resistance of liquids to flow Low viscosity vinegar tiny molecules (H 2 O and HC 2 H 3 O 2 ) Its a tangling issue, just like hair High viscosity corn syrup large molecules Section 7.5 Surface tension energy required to increase the surface area of a liquid Its a glue issue. High surface tension the liquid molecules are attracted to each other example: water beads Low surface tension where the liquid molecules dont have much glue example: acetone runs everywhere Section 7.5 concave convex strong adhesive forces between H 2 O and glass (Si-O-H) weak adhesive forces between Hg and glass (Si-O-H) Lo E r r 1 r 2 Interaction Energy at 25 C Section 7.6 r 3 + Na- Cl Solid r, PE is small H O H + + - Liquid r, PE is medium N N Gas r, PE is large PE = potential energy Solid Liquid Changes of State Gas Lo E Hi E Section 7.6 Potential Energy E out f r e e z e E in m e l t E out c o n d e n s e E in e v...
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