How Osmosis Affects A Potato
Aim: - To See How Osmosis Affects A Potato
Preliminary work
Prediction: -I predict that the weight of the potato in the sugar
solution will decrease and the weight of water will increase. I
predict that the weight of the potato in the sugar solution will
decrease when it reaches 3:1 (salt: water).
In put Variables:
-Molarity
-Size of potato
-Mass of Water
-Molarity of Sugar
-Length of time in the solution
-Temperature of water
Out put variables:
-Weight of potato
Key variables:
-Molarity of sugar. This is a key variable because it has the most
effective outcome because osmosis only works when there are different
molarities in and outside of the potato other wise the diffusion
theory of osmosis wont work.
We are going to keep a fair test by:
- Keeping all the volume of water the same in each test tube
- Keeping the starting weight of the potato the same to begin with
- When removing the excess water of the potato make sure all excess
water is removed but without squeezing any water out of the potato
- Keeping the temperature of the water the same
- Use the same type of potato (grown from the same potato)
We will keep the experiment safe by making sure that all the test tube
racks are in a suitable position so they wont easterly be knocked
over.
Preliminary results
---------------------------------------------
Sugar Water Time left in
0.44g 0.44 Start
0.43g 0.44 5mins
0.42g 0.45 10mins
0.49g 0.46 15mins
0.38g 0.46 20mins
---------------------------------------------
The table above shows the weight of the potato.
Prediction
I predict that the weight of the potato in the sugar solution will go
down and the weight of the water will decrease because the water
molecules in the sugar solution are small enough to diffuse through a
semi-permeable membrane in the potato is the high concentration of
water and water will only go through from a high concentration to a
low concentration of water. Water goes into a potato sample because
there is a higher concentration of water out side the potato than
inside of the potato and water will go from a high concentration to a
low concentration therefore the water will go into the potato and...
... middle of paper ...
... to be sure
to show a constant pattern. We didn't have any anomalous results maybe
because we mad sure that we left each potato in the solution an equal
amount of time. Also when we removed access water we were very careful
not to squeeze any water out of the potato other wise it would of made
it an unfair test. To improve reliability and accuracy next time in
the prim nary plan I would make sure that my prediction was detailed
so I would understand everything much clearer in order to get a better
set of results. Also the preliminary experiment next time will be a
lot more accurate in the way that we should take more care in time
that the potato is left in the solution for how ever long of a time it
should be left in. The main plan could be longer and in more detail so
that it is more clear to read and understand. The amount of results
that we got was just about enough to work out and see weather the
prediction was correct. This means that next time we should do more
sets of results to get a more accurate outcome. To help back up this
experiment we could use more chats of graphs showing rate of osmosis
in time and other ways of showing how osmosis affects a potato.
The potato tubes in higher concentration sugar solution will shrink
When I am not using them I will place them away from my experiment and
This is because the water molecules passed from a high concentration in the water, to a low concentration, in the piece of potato. Therefore, the potato in higher water concentrations will have a larger mass than in higher sucrose concentrations. i.e. The potato pieces are shown to have water potential. The attached graph shows the concentration of the sucrose solution plotted against the average mean change in mass.
“The Mammoth Cometh” by Nathaniel Rich in the New York Times is an article that details the prospect of “de-extinction” and how scientists within the community have been forming arguments about how to best begin understanding what new technologies are capable of. “De-extinction” is the term given to the process by which scientists can bring back extinct animals, such as the wolly mammoth or the great auk, through genetic engineering. In order to ground the analysis of “de-extinction”, the author focuses particularly on the life of Ben Novak, a scientist, who from a young age, showed an incredible passion for bringing back the passenger pigeon.
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Extinction is no longer just a natural process. It is an enemy, slowly changing our world into a barren wasteland where life is as rare as a flower in the Arctic Circle's winter. The wolf, the tiger, the caribou, the elephant, the bison, the cheetah, the sequoia cactus, the redwood tree – all of these and so many more things are on the verge of disappearing from our planet forever. Extinction is the most pressing environmental issue of our time, because if it continues the way it is going without anything being done to counteract its causes and consequences, there will soon be no environment left for there to be debates about.
Since 10,000 BC, following the last ice age, a variety of living things are gone as a result of human life. People not only do one thing harmful to life, they do dozens. It is disgusting that these harmful activities are still be practiced. Amphibians are being affected the more then animals. It is natural to have Background extinction, it shows a healthy ecosystem, but this 6th Mass extinction has gone on too long. Humans need to fix their ways now or else the consequences will be fatal.
Psychologists have discovered that some cartoons tend to contain violence and may cause children to demonstrate aggressive behavior. “Children who have a high degree of exposure to the media may exhibit a relatively high incidence of hostility themselves in imitation of the aggression they have witnessed.” (Berkowitz, 1962) There have been numerous violent episodes that have been determined to be copycat cases of violence on television. In situations like this, the media exposure is considered to be reinforcement of the behaviors.
There is a strong agreement among American society that violence in the country is on the rise. It is easy to see why this is a strong argument among the American people, especially because of the rising popularity of violent video games and television programs. However, as these violent video games and television shows are creating their own place in our society, the reports of violence among children are escalating. This correlation has been studied extensively in the scientific community in an attempt to discover whether media violence does negatively impact children but there has yet to be a consensus. There is a split between those that believe that children are becoming more violent because they are exposed to violent media and those that believe that correlation is not causation, who argue that media violence does not have any notable effect the youth.
Grimes, Tom, James A. Anderson, and Lori A. Bergen. Media Violence and Aggression: Science and
Equipment Potato, Borer, Beakers, Measuring Cylinder, Stopclocks, Distilled Water, Electronic Balance, Salt solutions of various concentrations. Diagram [IMAGE] [IMAGE] [IMAGE] When we leave the potato in the solution for the allocated time, water
Mass extinction defined by David Jablonski, American professor of geophysical sciences at the University of Chicago is, “the substantial biodiversity losses that occur rapidly and are global in extent” (Kolbert, 2014) But how exactly is the seriousness of the current species loss that could actually be compared to the definition aforesaid? Though the exact number of species on earth is too complicated to be calculated, researchers have been trying to figure out some ways to estimate the numbers. The extinction rate today estimated by experts is to be between 1000 and 10000 times higher than the rate if human have not been around (background rate) reflecting the harm that are done by human activities is not imagined and indeed very serious. (Thomas et al., 2004) For ...
Typically, randomized experiments have reveal that exposure to media violence can cause immediate increases in aggressive thoughts and tolerance for aggression in both children and teenagers. For example, in a study with young children (Drabman & Thomas, 1974, 1975; Thomas & Drabman, 1975), a brief violent video film clip were shown to the group of youngsters, it was then found out that they were slower to call an adult to intervene when they saw two younger children fighting compared to the peers who had watched neutral film. This shows that the single violent clip appeared to make the children more tolerant of aggression, at least for only a temporarily period.
Earth has gone through five fully major extinctions before. We currently are in the process of Earth’s sixth mass extinction. This mass extinction is closely related in severity to the extinction of the dinosaurs. Earth’s extinctions are broken into three different areas. The first area was the large number of animals caught by hunter-gathers. The discovery of agriculture led to the second area of extinction, wildlife habitats. These wildlife habitats were destroyed due to humans starting to stay in one area.
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