BLOG SUBMISSIONS MUST BE COMPLETED AND UPLOADED ON OR BEFORE 11:59PM SUNDAY, NOVEMBER 16,2014. NO EXCEPTIONS
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Your blog summary must include the following KEY items of information to receive full credit;
- include the name's of your lab partners with your submission
- An original definition of diffusion and osmosis.
- Which material was used to simulate a cell membrane and give a characteristic(descriptive term) of this material?
- List one thing you learned and describe how it applies to a real life situation.
- Compare your results with your predictions. Do you find any conflicts that would cause you to revise your predictions?
- Does this lab account for ALL the molecules that were present during this lab?
- What does your data tell you about the sizes of the molecules related to the pore size of the baggie?
- An original picture from our class of your final product( cup and baggie) along with a description of which molecules are moving. Use arrows to illustrate how diffusion occurred in this lab.You can be creative here to exceed expectations. You may not share picture from any other group or use pictures from the internet. An example is seen below.
This lab was completed by Brandon Odemns and Cierra Drumgoole. Diffusion is the process of a substance moving from high concentration to low concentration. Osmosis is the diffusion of water across a permeable membrane. To show the cell membrane in our lab Brandon and I used a clear plastic sandwich bag. One thing that we learned was the cell membrane is the outter thing protecting whats on the inside only letting certain things in and out. This can be applied to everyday life because the shell of the egg is the cell membrane protecting whats on the inside of the egg. In the beginning of the lab Brandon and I thought that the starch would turn Brown in the beginning of the lab because of the iodine color. This was wrong though because after our 15 minutes the starch was still white. Personally I don't think we had enough iodine.
ReplyDeleteThis lab was done by Diamond Lewis and Lakeya Callaway. Diffusion is the transfer of molecules from an area of high concentration to an area of low concentration. Osmosis is the movement of water across a semi permable membrane. During this lab we learned that diffusion transfers all molecules and osmosis transfers just water. This can connect to a real life situation because when air freshner is sprayer the person closer to the area will smell it before a person further from the area. In the beginning of this lab, my partner and I predicted that the iodine would go inside of the plastic because it is a small subtance and it can fit through the tiny wholes in the bag and then tirn the starch purple. We did not have any conflict because our prediction was correct. In conclusion, yes all the molecules in this lab that was present was accounted.
ReplyDeleteThis Lab was completed with a joint effort of Joshua Wright , Ahmad Hassan, and Gregory Silvers. Diffusion is the process in which molecules from an area with high concentration travels to an area of an lower concentration. Osmosis is the movement of water molecules across a semi-permeable membrane. A semi-permeable membrane is a membrane that allows certain things to pass through. The material that was used to simulate a cell membrane was a plastic sandwich bag. The plastic bag was thin and had microscopic holes in it. The holes are what allowed the iodine to pass through into the bag because of the flower it was attracted to. During this lab we learned about diffusion,osmosis, semi-permeable membranes, we also learned that iodine is called an indicator because it changes color when it comes in contact with another substance.
ReplyDeleteA real life example of diffusion is when I spray my cologne and it travels from my bathroom into the hallway. My prediction was correct I thought that the iodine would diffuse into the baggie with the flour. Yes, all the molecules were a factor in this lab. The iodine molecules were much smaller than the hole of the baggie with allowed them to flow through easily.
Joshua, Gregory, and I were partners in the diffusion lab. In this lab, we observed the diffusion of a substance across a semi permeable membrane. A plastic bag acted as our semi permeable membrane. Even though it may seem that a plastic bag has no holes, but under a microscope they have small holes that allow the smallest molecules to go through, these small holes are known as pores. Iodine is a small molecule that can pass through these pores. Through diffusion, the process of which molecules move from an area of greater concentration to an lesser concentration , we wanted to see if water mixed with iodine would travel through the plastic bag. This also deals with Osmosis, which is the diffusion of water (across a membrane). To figure out if the iodine would travel through the plastic bag, we placed a teaspoon of corn starch and water in a bag and put the bag into a breaker that was filled with water and twenty drops of iodine, and put a timer for fifteen minutes. Iodine is a known indicator for starch, so when iodine is in the presence of starch, the starch changes color. What happened in this lab correlates to the cellular system of animals and plants, which allows water molecules and other substances to pass across the permeable cell surface membrane. Our group predictions was that the solution in the beaker that started with an dark orange color would eventually change to brown, and the solution in the bag that started with a white color would change to purple, after fifteen minutes. After the fifteen minutes, the color of the solution in the bag changed to purple, due to both diffusion and osmosis. The color of the solution in the beaker changed to a light brown because during the fifteen minutes the iodine was moving from an area of higher concentration to a lesser concentration.
ReplyDeletewow we both did it
DeleteThis lab was finalized by Sakari Scott and Quonnetta Jones. Diffusion is the process by which molecules spread from areas of high concentration, to areas of low concentration. Osmosis is he diffusion of water across a selectively permeable membrane. During this lab, we had used a plastic bag to simulate a cell membrane. In this experiment, we have learned osmosis involves with water and diffusion can be in the air, creating molecules to move from high concentration areas to low concentration areas. This can link to a real life situation when you put ink inside a full glass of water because at first it will sink down to the bottom of the glass but overtime it will spread upward to low concentration area. Me and Quonnetta had predicted that if you would put starch inside the plastic baggie then put inside the beaker that was fill with water, it will turn the color of substances. In my results, the iodine had moved into he bag making the starch turn purple. So, the plastic bag was permeable to the iodine allowing the iodine to pass through, but not the starch. We didn't have any conflicts with our prediction because it was right. Yes, all the molecules was presented during the lab. The starch was too large to pass through the pores because the pores in the plastic bag were small.
ReplyDeleteThe diffusion lab was completed by George Anderson and Katrina Swinton. Diffusion is the process by which molecules spread from areas of high concentration to areas of low concentration. Osmosis is the diffusion of water across a membrane. For a membrane, we used a plastic bag, which was filled with cornstarch and water. we also used a beaker that was filled with water and was mixed with ten drops of Iodine, through diffusion and Osmosis the iodine was allowed to move from high concentration to low concentration through the plastic bag, which acted as a cell membrane. We predicted that the solution in the beaker would start off as the color of Urine and after the 15 minutes the solution in the beaker will stay the same, and also that the solution in the bag would start off white but eventually after 15 minutes would turn purple. In the lab we didn’t find any errors because our prediction was right, after 15 minutes the solution in the bag had a purple color. From this lab i learned that sandwich bags had tiny microscopic holes that can only seen under a microscope. Through time the Iodine, which is a small molecule, was able to flow through the pores and into the bag and change the color of the corn starch. Just like Peanuts, the hard outside shell is the permeable membrane, it protects the seed that’s inside. Yes the lab account for all the molecules that were present during the lab.
ReplyDeleteThis lab was completed by myself and in this lab I used a plastic bag filled with a tea spoon of corn starch and this acted as my semi-permeable membrane. Then I used a small amount of iodine and this was used to see if it would diffuse through the plastic bag. Diffusion is when substances go from high areas to lower areas. Also, osmosis was another thing that I was trying to observe. Osmosis is when water molecules go from a higher level to a lower level. My first step to doing this lab was to put the bag in the iodine and then take a picture of it before I started observing it for osmosis and diffusion. Then, I set a timer for 15 minutes and made observations seeing if the color of the corn starch changed and if the color of the iodine changed also. I predicted that if the bag was permeable to iodine I expected for it to turn a yellowish color and the solution in the beaker to be the same after 15 minutes. After 15 minutes the color in the bag was clearer and the iodine in the beaker was a clear yellowish color. I think this may have happened because there wasn't enough iodine put into the beaker possibly.This lab does not account for all of the molecules that were present during this lab. This lab tells me that the molecules size related to the pore size of the baggie was smaller. One thing I learned is that diffusion can occur on the outside of an egg and the shell can act as a semi permeable membrane and this can cause the shell to be protected and this is something we use in everyday life.
ReplyDelete