Transcript Chapter 6-2: Water and Diffusion

Chapter 6-2: Water and
Diffusion
Why is Water Important?
 Makes
up 75% of us
Water cont…
 Polar
molecule—has a positive side
and a negative side
Atoms in a covalent bond that do not
share electrons equally
 Ex: Oxygen is negative and hydrogen is
positive in water

Water cont…
 Hydrogen
bond—holds two water
molecules together
Water cont…
 Doesn’t
like change in
temperature
 Good
insulator
Water cont…
 Expands
frozen
 Ice
(gets bigger) when
is less dense (weighs less) than
liquid water
 Ice floats on water
Water cont…
 Can
break rocks apart
 Will form soil over time
Diffusion
 Kinetic
energy—energy in motion
 Anytime
you move
Diffusion cont…
 Moving
from area that is crowded to
an area with more room

Higher temperature can make diffusion
happen faster
Diffusion cont…
 Dynamic
Equilibrium—when
molecules are equal in both
areas/sides
Diffusion cont…
 We
use diffusion to move food
and oxygen into or out of our
organs