FND 300 Chapter Notes - Chapter 13: Vapor Pressure, Frozen Dessert, Dielectric

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Week 1: water interactions (chpt 13: 543-555; chpt 2: 33-34) Not all water is pure water, due to presence of isotopes of o & h. *but, the ql & qn contributions of these isotopes are small enough to be ignored. Ionization of water = oh- & h3o+; only affects structure of h2o at extreme phs. O-h bond in water: 0. 96a & 180o diagram. O-h bond among water molecules = 1. 86a. Associations b/w water molecules are bc of its polarized nature (40% ionic character) & v-shaped bond; these allow for hydrogen bonding. *bc of this, it can form links with 4 other h2o molecules. I(cid:374) i(cid:272)e, o(cid:454)(cid:455)ge(cid:374) ato(cid:373)s are arra(cid:374)ged i(cid:374) (cid:858)(cid:272)hair stru(cid:272)tures(cid:859) & there is (cid:272)o(cid:374)ti(cid:374)uous os(cid:272)illatio(cid:374) of the hs (cid:271)/(cid:449) 2 os diagram. Structure of ice is not static (oscillation occurs & the ions will be taken by other solutes), not even at -20o (food preservation temps)

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