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Lab #4
Movement across membranes
| Question | Answer |
|---|---|
| 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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