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Lab #4

Movement across membranes

Brownian Movement The microscopically visible motion of particles as they are bombarded by molecules.
Brownian Movement slide Particles of India ink moving - look alive - because of the distilled water bouncing against the India ink. Vibrating
Diffusion Tendency - due to random molecular motion - for substances to scatter or move away from regions of high concentration
Diffusion when heat is added Substances diffuse at a faster rate
Diffusion without heat Substances diffuse at a slow rate
Particle size - small or lighter in weight Substance that is small or lightweight will move across a surface (or material) at a faster rate
Particle size - large or heavy in weight Substance that is large or heavy will move across a surface (or material) at a slower rate.
Osmosis Diffusion of water across a selectively permeable membrane
Isotonic Balanced solution
Hypertonic High concentrated solution
Hypotonic Low concentrated solution
Cells in isotonic solution Remain intact
Cells in hypotonic solution Swell and burst
Cells in hypertonic solution Crenate (shrivel)
Dialysis The separation of small dissolved particles from larger particles by means of diffusion across a selectively permeable membrane.
Ionic solutions Called electrolytes because they are electrically charged and will conduct an electrical current. (ONLY ACIDS, BASES AND SALTS)
Covalently charged particles Can not conduct an electrical current.
Distilled Water - electrolyte? No
Tap Water - electrolyte? No
Starch - electrolyte? No
Glucose - electrolyte? No
NaCl - electrolyte? Yes, strong electrolyte
HCl - electrolyte? Yes, strong electrolyte
NaOH - electrolyte? Yes, strong base electrolyte
Sugar cubes sweetening tea without stirring Diffusion
Cells bursting in distilled water Osmosis
Meat being dried and preserved with salt Osmosis
Perfume reaching nose of one person from the skin of another Diffusion
Urea diffusing from blood into water for artificial kidney Dialysis
Milk at dairy poured through cotton pad for cleaning Filtration
Kinetic Name given the movement of particles due to molecular bombardment
Passive Diffusion, osmosis, dialysis and filtration are all examples of active or passive processes?
Osmosis Which term is the most inclusive - osmosis, diffusion, dialysis?
Water As osmosis occurs in the body, what substance is crossing a selectively permeable membrane?
NaCl When other factors are held constant, which substance - glucose or NaCl - should diffuse faster?
Glucose Which has the most particles - a 5% glucose solution or a 2% NaCl solution?
Hypertonic In osmosis, net movement of water is into the hypertonic or hypotonic solution?
Iodine What material is used to test for starch?
Benedict's solution What material is used to test for sugar?
Hydrolysis The membranous bag used to demonstrate dialysis swells and may even burst. What is the term for this?
Osmosis Which of these is not a special type of diffusion - osmosis, dialysis, filtration?
Erythrocytes What are most of the large molecules in blood that do not move across membranes by diffusion or filtration?
Electrolytes What term is used for substances that ionize in water?
Acids, bases, salts What three types of compounds are electrolytes?
Created by: daydreamer67



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