Lab notes 9/20
Lab notes 9/20 Biology 003
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This 1 page Class Notes was uploaded by Faith M Elissague on Tuesday September 20, 2016. The Class Notes belongs to Biology 003 at Los Angeles Valley College taught by Yousef Harfouche in Fall 2016. Since its upload, it has received 8 views. For similar materials see Intro Biology in Biology at Los Angeles Valley College.
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Date Created: 09/20/16
Lab Quiz Study: For lab on 9/20 Q: What is dialysis? A: The separation of particles in a liquid on the basis of differences in their ability to pass through a membrane. Q: Did the bag gain or lose weight? And Why? A: It gained weight because of osmosis and particles moving inside into the higher concentration to equalize both solutions on the inside and the outside. Q: What are the different tests? What do they test? And what are their initial colors and the color change if the tests turn out to be positive? A: Silver Nitrate: tests salt, initial color is clear, and the color change is cloudy white Iodine test: tests starch, initial color is reddish brown/yellow, and the color change is black The benedict’s test: tests sugar, initial color is blue, and the color change orange/brown Q: Why did the sugar and salt diffuse and not the starch? A: Sugar and salt have smaller molecules that starch (R emember: starch is a polysaccharide which means it is made up of long chains of glucose). S o the smaller molecules are able to pass through the selective permeable membrane. Q: What is osmosis? A: It is the spontaneous net movement of solvent molecules through a semipermeable membrane into a region of higher solute concentration, in the direction that tends to equalize the solute concentrations on the two sides Q: What happens when cell is placed in the salt solution? A: It shrinks because the water inside the cell moves from where there is more water to where there is less, namely the salty water outside the cell. Because of this the water moves outside, becomes dehydrated, and the cell becomes shriveled up and shrinks. Q: What is the overall equation of photosynthesis? A: 6CO + 12 H O + light → 6O + 6H O + C H O 2 2 2 2 6 12 6 Q: What do we need in photosynthesis? A: Carbon dioxide from the air, water, and light. Q: What do we get out of photosynthesis? A: sugars and oxygen Q: What is chromatography? A: The solvent mixes with the pigments creating a solution. The solution then moves up the paper due to capillary action.
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