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Description
Flashcards by ADITI SINGH, updated more than 1 year ago
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Created by ADITI SINGH
almost 2 years ago
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| Question | Answer |
| BIOLOGY diffusion experiment with KMnO4 materials- crystals of KMnO4, a beaker containing water | procedure- add the given crystals to the beaker containing water on one side. the crystals will dissolve and spread out in water observation- the crystals completely dissolve in water and turn it into dark pink |
| INFERENCE - > the molecules of KMnO4 diffuse uniformly in water. this movement takes place from corner to the parts where they are not present in water. it continues till they are uniformly distributed in water. | DIFFUSION : the free movement of molecules of a substance from the region of higher concentration to the region of lower concentration when the two are in a direct contact. |
| Osmosis experiment with potato osmoscope. materials- potato, 30% sucrose solution, water, dye/stain, Petri dish, scalpel and pins | procedure- peel a large sized potato with a scalpel -cut it into rectangular shaped block- scoop out the central content from up to bottom- fill the cavity with 30% sucrose sol- pin the initial level- place the potato in a petri dish - leave it for 5-6 hours |
| obs- level of sucrose sol rises, sucrose sol separated from water by the means of potato inference- potato cells have freely permeable cell walls and semi permeable plasma membrane. water from pdish enters the cells due to cell to cell osmosis resulting in the rise of level of sucrose sol. | precautions- base of the potato osmoscope should be thin, potato should be properly peeled, sucrose content should be more than the water in petri dish osmosis- movement of water molecules from the region of higher concentration to the region of lower conc thru a semi permeable membrane. |
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