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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