Essay About Hydrogen Bonds And Temperature Change

Hydrogen Bonds
A. Hydrogen bonds make liquid water cohesive
hydrogen bonds last only a few trillionths of a second
Cohesion- the tendency of molecules of the same kind to stick together
tress depend on cohesion because it helps transport water and nutrients from roots to their leaves by water beads
Adhesion- the clinging of one substance to another
surface tension- a measure of how difficult it is to stretch or break the surface of a liquid
hydrogen bonds give water the high surface tension
2.11
A. hydrogens bonding has a stronger resistance to temperature change than most other substances
Heat- amount of energy associated with the movement of atoms and molecules in a body of matter
Temperature- measures the average speed of molecules rather than the total amount of heat in a body of matter
B. heat must be absorbed in order to break hydrogen bonds, and heat is released when hydrogen bonds form
when water cools, more hydrogen bonds form, letting a lot of heat released
C. water’s resistance to temperature change also stabilizes ocean temperatures, creating a favorable environment for marine life
66% of your body weight is water
evaporative cooling- when a substance evaporates, the surface of the liquid that remains behind cools down
this occurs because the molecules with the greatest energy( hot molecules) leave
this prevents land animals from overheating
2.12
A. ice is less dense than liquid water
as it freezes, each molecule forms a stable bond with its neighbors, holding them at arms length and creating a 3D crystal
since ice has its molecules spread apart, the ice becomes less dense because the molecules are