CHEM 110 Lecture Notes - Lecture 10: Enthalpy, Heat Sink, Covalent Bond
Wednesday, September 27, 2017
Properties of Water - Part 2
CHEM 110
-Liquid = disorganized
-Liquid water when its cool enough starts to look like a solid even when it still moves
like a liquid
-High temp: you’re too close so you repel
-Low temp: less than 0 = oscillate
-Why is Water Different?
•2 covalent bonds, 2 H bonds
•(3rd)trimer, (4th)tetramer
•Has solid like properties
•Has a strong resemblance to diamond with holes in the middle of structure
•As you warm things up they get larger and larger
•Water’s well behaved when its really warm
•Water does something no other liquids do
-As it stats to freeze, everything clumps together and falls down.
-Ice cubes floating, less dense
-Property: Heat Capacity
•Exceptionally high: 75.3 J/K mol
-Most gases: ~30 J/K mol
•Water can serve to moderate temperature —> a heat sink
•Enthalpy = thermo dynamic quantity equivalent to the total heat content in a system
•It’s high heat capacity moderates those swings
•Want as much regulation as possible
•Larger fluctuations of the own on
•Water can absorb a lot of heat
•Cool Down Wine Bottle
-Best when there is more contact to surface
•Use a bucket of cold water and ice!
1
LY
37
CHEM 110 Full Course Notes
Verified Note
37 documents
