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diffusion is defined as the spontaneous movement of atoms, ions, and molecules from areas of higher concentration to areas of lower concentration. a difference in concentration like this is called a concentration gradient. the concept of diffusion should make intuitive sense to you, based on everyday experience. if you have put a drop of food coloring in water and watched the pigment molecules slowly spread out until the coloration is even throughout the solution, or seen soot rise from a smokestack or fire and move up and out, so the particles were spread more and more evenly into the surrounding atmosphere, you have watched diffusion in action. in each case, particles are moving along a concentration gradient, from areas of high concentration to areas of low concentration. diffusion is a spontaneous process, meaning that it happens without an input of energy. it results from the random motion of substances—their kinetic energy. diffusion is a great example of what scientists call entropy. entropy is the tendency for systems—which in this case means any collection of physical objects—to tend toward a state of greater randomness or disorder. it is part of how the universe works. it is \the way things go.\ consider the \system\ consisting of amino acids in the cell you just analyzed. from the starting state to what things looked like after diffusion occurred, did entropy in the system increase or decrease? decrease increase same (no change)
Entropy is the tendency towards greater randomness. Diffusion spreads substances from high - to low - concentration, increasing randomness. In the case of amino acids in the cell, after diffusion, the distribution becomes more even and random, so entropy increases.
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