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Solutions, Osmosis, and Diffusion Lab Report

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Sharena Thibodeaux
Biology 112
M-11am Class
By
Sharena Thibodeaux
Biology 112
M-11am Class
By

Osmosis and Diffusion
Osmosis and Diffusion

Introduction
Diffusion is the passive transport of individual molecules from higher concentration to lower concentration. Without extra forces, the molecules will travel down its concentration gradient. The more concentrated a molecule is, the faster it will diffuse to the lesser concentrated region. Therefore, a diffusion rate can be calculated according to the amount of molecules in a specific solution or medium. Each molecule moves independently of others, the movement is random, and there is no use of energy in the process whatsoever. In addition to the concentration of the molecule, the rate of diffusion also depends on the size of the molecule. Diffusion can occur in liquids, semi-solids, gels, and gases, each with a different diffusion rate. At higher temperatures, the heat energy causes the molecules to collide into each other, therefore causing diffusion to occur more rapidly, whereas with colder temperatures, there are fewer collisions, and slower diffusion through a medium.
Osmosis is the net diffusion of water across a semi-permeable membrane. If a membrane is permeable to water, the water will move passively through it without energy from an area of low concentration of solutes to an area of higher concentration.
The primary difference between osmosis and diffusion is the fact that diffusion can occur in air, whereas osmosis involves water. Both osmosis and diffusion have one goal in common, though, and that is to reach equilibrium. Once equilibrium is reached, there will be no movement of molecules.
Null Hypothesis: There will be no net movement of particles.
Alternate Hypothesis: Osmosis and Diffusion will occur according to the concentration of solutes inside and outside of the cell. If the solution outside of the cell is hypertonic to the inside of the cell, then water will move from the...

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