Cell Membrane Laab
Part A- Diffusion
diffusion- the movement of molecules from an area of high conc. to an area of low conc. until equilibrium
the potassium permanganate‘s radius expanded = showing simple diffusion
example | diffusion? |
perfume bottle opened → odors spreads in room | yes |
sugar dropped into water and dissolves throughout | yes |
water molecules moving in hose | no |
air molecules move by air forcefully blown | no |
Part B- Osmosis
osmosis- high conc. to low conc. through a semi permeable membrane in water
molasses in thistle tube until overflow top of bulb→ air remained trap in stem -) bulb covered with semi permeable
Part C- hypertonic, hypotonic, and isotonic solutions
red onion cells | solution | water |
equilibrium | isotonic | tap |
cells shrank | hypertonic | salt |
cells swelled | hypotonic | distilled |
Part D- Filtration
filtration- seperation of molecules through a semipermeable membrane by the application of force
plastic funnel over filter paper, have charcoal water leak through filter paper → only clear water gets through and charcoal separates
→ test for glucose and use Benedict’s solution, if color changes to green yellow or red then glucose present
→ test for starch using Lugol’s iodine solution. if color changes rom blue to black, starch present
-gravity responsible for movement of substances
Part E- Egg Osmosis
initial mass : 75.1
day 1: naked egg in vineger → egg will float (isotonic)
(mass becomes 75.1 grams)
day 2: egg in karo syrup (hypertonic)
(mass becomes 31.1g)
day 3: egg in distilled water (hypotonic)
(mass becomes 76.7g)
Part A- Diffusion
diffusion- the movement of molecules from an area of high conc. to an area of low conc. until equilibrium
the potassium permanganate‘s radius expanded = showing simple diffusion
example | diffusion? |
perfume bottle opened → odors spreads in room | yes |
sugar dropped into water and dissolves throughout | yes |
water molecules moving in hose | no |
air molecules move by air forcefully blown | no |
Part B- Osmosis
osmosis- high conc. to low conc. through a semi permeable membrane in water
molasses in thistle tube until overflow top of bulb→ air remained trap in stem -) bulb covered with semi permeable
Part C- hypertonic, hypotonic, and isotonic solutions
red onion cells | solution | water |
equilibrium | isotonic | tap |
cells shrank | hypertonic | salt |
cells swelled | hypotonic | distilled |
Part D- Filtration
filtration- seperation of molecules through a semipermeable membrane by the application of force
plastic funnel over filter paper, have charcoal water leak through filter paper → only clear water gets through and charcoal separates
→ test for glucose and use Benedict’s solution, if color changes to green yellow or red then glucose present
→ test for starch using Lugol’s iodine solution. if color changes rom blue to black, starch present
-gravity responsible for movement of substances
Part E- Egg Osmosis
initial mass : 75.1
day 1: naked egg in vineger → egg will float (isotonic)
(mass becomes 75.1 grams)
day 2: egg in karo syrup (hypertonic)
(mass becomes 31.1g)
day 3: egg in distilled water (hypotonic)
(mass becomes 76.7g)