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Osmosis

INTRODUCTION
Osmosis is defined as the movement of water from an area of high concentration of water to an area of low concentration of water. "Kinetic molecular theory of matter this theory states that all matter whether it exists as a liquid, gas, or solid in a state of constant motion. The molecules that make up the matter are always moving in random fashion." (lab # 5 pg. 1) "Passive Transport the transport of molecule without requiring the cell to expend any energy. This causes molecules to bump into each other and move in new directions diffusion is the result of this contact. (Johnson, Michael pp. 55) Random movement of molecules to an area of lower concentration from an area of higher concentration is known as Osmosis. "Not all substances diffuse readily into and out of living cell". (Johnson, Michael pp. 55) Plasma membrane is known as selectively permeable. Semi-permeable membranes are very thin layers of material (cell membranes are semi-permeable) which allow some things to pass through them but prevent other things from passing through what is know as diffusion. Isotonic solute concentrations inside and outside cells are equal. Therefore no net movement of water into or out of cell. Hypotonic solution is low in solutes high in water molecules compared to a hypertonic solution. Hypertonic is high in solutes low in water molecules. Active transport is the transport of specific solutes across plasma membranes against the concentration gradient through use of cellular energy. (Johnson, Michael pp. 55)


Hypothesis

When putting sucrose solutions into liquid containing water one of three things will happen. The cells that are in a control environment will become hypotonic, hypertonic and isotonic.
Materials and Methods
• beaker
• water
• sucrose
• scale
• artificial cells
• thread
• clock
• pen
• paper

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