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biological membranes lab

# biological membranes lab - Rachel Romm Biology 1H Ms...

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Rachel Romm Biology 1H Ms. Mackley 12 November 2008 Biological Membranes Lab

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Part 1: Data and Analysis: Data table 1: Diffusion of a liquid in a liquid observations Time (min) Observations Before The water is clear 0 The dye is only on the top where it was dropped; no dye on the bottom 5 The dye spread out on the bottom; strips of dye between top and bottom of the water 10 Mixed, no strips; dye is more concentrated on the bottom (dye sunk) 15 Generally mixed; more dye on the bottom 20 Bottom contains most of the dye; bottom is very red (with dye) Questions: 1. Is the concentration of the colored part of the solution greater at the beginning o the end of the experiment? - End of the experiment 2. Is the free energy of the solution greater at the beginning or end? - beginning 3. Is the entropy of the solution greater at the beginning or end? - beginning 4. What difference would you have seen of you had set up the beaker in the refrigerator? In the first 5 minutes of observation, the dye was mixing somewhat evenly with the water. However, after some time, the dye slowly separated itself from the water by sinking and concentrating itself on the bottom of the beaker.
-the spreading out of the dye would have slowed down because there is less kinetic energy when it is cold Part 2: Data and Analysis: Data table 4 – 1.1: Diffusion in a solid Ban d Reaction Color AB Ag+ Cl- = AgCl Cream BC Ag+ Br- = AgBr Blue CD Ag+ Fe(CN) 6 - =AgFe(CN) 6 Orang e Data table 4 – 1.2: Diffusion in a solid Ion Measuremen ts Distance (mm) Ratio D 1 /D 2 = R 1 / R 2 Relative Rate (mm) Cl- Ag+ B AB band A AB band D 1 = 6 D 2 = 5 Cl-/Ag+= 6/5 Cl- moved 6 Br- Ag+ C AC band A AC band D 1 =5 D 2 =8 Br-/ Ag+ = 8/5 Br- moved 5 Fe(CN) 6 - Ag+ D AD band A AD band D 1 =4 D 2 =4 Fe(CN) 6 -/Ag+ = 1 Fe(CN) 6 - moved 4 Data table 4 – 1.3: Diffusion in a soild

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biological membranes lab - Rachel Romm Biology 1H Ms...

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