December 20, 2012
The cell membrane is a protection from anything outside the cell and anything inside of the cell. The purpose of the cell membrane is to selectively choose what comes in the cell. It’s permeable and able to regulate what enters and exits the cell, which is facilitating the transport of materials needed for survival. Cell membranes aren’t in just one specific kind of cell because it’s in every cell. The cell membrane is supposed to hold up the structure of the cell keeping all organisms in alignment. Osmosis is the movement of solvent molecules through a partially permeable membrane into a region of higher solute concentration, in order to equalize the solute concentrations on the two sides. We didn't know anything about osmosis except that it was a word in the dictionary that we never picked up. Osmosis and diffusion are similar because osmosis is the result of diffusion across a semi-permeable membrane. If two solutions of different concentration are separated by a semi-permeable membrane, then the solvent will most likely to diffuse across the membrane from the less concentrated to the more concentrated solution, which is osmosis. Some real life events of osmosis are cells in the human body and in the bodies of all living things behave like microscopic bags of solution housed in a semi permeable membrane. The health and indeed the very survival of a person, animal, or plant depend on the ability of its recovery. Osmosis has several implications where medical care is concerned, particularly in the case of the storage of vitally important red blood cells. These are normally kept in a plasma solution, which is isotonic to the cells when it contains specific proportions of salts and proteins. However, if red blood cells are placed in a hypotonic solution, or one with a lower solute concentration than in the cells themselves, this can be highly detrimental. The purpose of this lab is to grasp a better meaning of osmosis with the idea of diffusion understanding how they're similar and different at the same time. Also to get the opportunity to see first hand with hands on lab to see what is osmosis for us. The egg with vinegar caused the eggshell to deteriorate meaning the relationship between the egg and vinegar is to erase the outer shell of the egg. The problem of the lab is what is the affect of osmosis in different environments (solutions). In my first hypothesis I predict that the only change that the egg will undergo will be the color change. I think that the egg will become a white like clear and the egg will become water with the yolk being the only part left of the egg, even though my hypothesis was not correct. For my second hypothesis, I predicted that the egg would become brown in syrup because that's the dominant color of syrup plus it’s heavier than the egg. And the egg will remain like a bag except that another layer of the eggs will disappear in the syrup. In the next hypothesis I believed that in water and salt the egg will be clear. And become bigger because the water isn't dense like the vinegar and syrup giving the egg room to move. Furthermore for my last hypothesis, I thought that the egg will be the color of the soda. Eventually I think the egg will be no more from all the high and low concentrated solutions leaving it to be drastic change that the egg won’t be able to handle it leaving nothing but the yolk. And if there is some egg left it will become saggy like a plastic bag. Materials:
* Corn syrup
* Pancake Syrup
* Weighing Machine
1. Get out six cups
2. Place one egg in each cup gently making sure none break
3. Put a tag or sticky pads on the cups one for every cups and name them so you can differentiate them. 4. Weigh the egg either by using a triple beam balance or a weight machine. 5. Take the circumference by putting the...