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CHEM 111 (69)

3 states of matter, phase changes, 2 types of forces, dispersion (London) forces, polarizability, dipole-dipole forces

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Colorado State University
CHEM 111
Dana Johnson

27 October Announcements Exam tonight Clark building, 7 – 9 pm Room assignments the same, list on RamCT Recitation tomorrow – optional Exam review B202 only Every hour from 9 – 3 pm Clicker question Does the molecule C H 2l2ha2e a dipole moment? (Assume the C’s are the central atoms.) a. Yes b. No c. You can’t tell from the above. You need specific structure Clicker question Which of the following molecules is / are polar? PCl5 CH O3H 3 HBr OF 2 a. HBr and OF on2y b. CH O3H onl3 c. CH O3H , H3r and OF 2 d. PCl 5nd HBr only e. All are polar 3 state of matter review Solid Particles strongly attracted to each other Maintains shape and volume Liquid Particles have more motion and can move over one another Generally maintains volume Shape conforms to the container Gas Motion greater than attraction Shape and volume depend on the container Phase changes Endothermic (require energy) Melting – solid → liquid Vaporizing – liquid → gas Sublimination – solid → gas Exothermic (release energy) Condensation – gas → l
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