Lab 5: Diffusion And Osmosis Flashcards
Define osmosis??
The movement of water through a semi-permeable membrane corresponding to concentration of ions in and outside cell.
Define diffusion?
The movement of molecules from an area of high concentration to low concentration. The process by which cells retrieve nutrients from their surrounding.
Define Agar??
A gelatinous polysaccharide derived from red algae.
Define dialysis tubing??
A manufactured, semi-permeable material, like a cell, that allows certain molecules to diffuse so long as they correspond with the pores in the material.
Define Potassium Permanganate??
KMnO4. Water soluble purple salt.
Define Selective Permeability??
Cell has some control over what crosses it so that only certain molecules either enter or leave.
Define Hypertonic??
Noting a solution of higher osmotic pressure than another with which it is compared.
Define Hypotonic??
Noting a solution of lower osmotic pressure than another solution with which it is compared.
Define Isotonic?
Noting or pertaining to solutions characterized by equal osmotic pressure.
Define Cork Borer?
A metal tool used for cutting a hole in an object, usually to insert a glass tubing, with the individual borer being hollow.
Define Dionized Water??
Hypotonic because most all ions have been removed.
Describe deionization??
Removing ions from a solution by passing water through two ion exchange materials. The first removes calcium and magnesium ions and then Removing + metallic ions by replacing them with an iron exchange material.
Why does potassium permanganate diffuse slower in gel??
It’s due to the ionic conductivity of the polymer as oppose to water, which has a greater conductivity, thus allowing the ion bonds to form.
