Diffusion Osmosis - basic principle

Diffusion of the dye

Simple animation to demonstrate diffusion

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Dialysis bag experiment Glucose is a monosaccharide, small enough to diffuse out of the bag and into the beaker; glucose test strip, when dipped into the beaker detects glucose that has diffused into the beaker Starch is a polysaccharide and too large to diffuse out of the dialysis bag; Lugol's in the beaker diffuses into the bag and reacts with starch to form a blue black precipitate inside the bag Dialysis bag contains a mixture of glucose and starch

Simple animation to explain dialysis bag experiment

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Plasmolysis - Elodea Plamolyzed cell contents Cell wall Chloroplast

Animation to demonstrate plasmolysis in Elodea

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Potato experiment set-up 40 mL of different salt concentrations are added to marked beakers A ruler is used to cut out 1 inch pieces Potato cylinders are collected in a petri dish A cork borer is used to cut out cyliders from a potato

Potato experiment begin test Each potato cylinder is weighed individually and placed in the beakers that contain different salt solutions

Potato experiment end result After 30 minutes, each potato cylinder is taken out of the beaker, gently rolled over a paper towel, and weighed again; the difference in weight before and after adding to the salt solution is calculated for each cylinder and percentage change in weight is calculated to detemine if a solution was isotonic, hypotonic or hypertonic