Investigate the Osmosis in Potato Rods in Various Concentrations of Salt Solutions
Introduction:
Osmosis is the movement of water molecules across a partially permeable membrane from a region of high water potential to a region of low water potential. It can be affected by several different variables including concentration of salt solutions. When a plant cell is put in pure water it will become turgid and it will not burst due to the presence of a cell wall and a large permanent vacuole and when it is put in a concentrated solution it will be plasmolysed, on the other hand when an animal cell is put in pure water it will burst due to the absence of the cell wall which is only present in the plant cell and if is plant cell is put in a concentrated solution it will shrink. What is the water potential?
The water potential of a solution is a measure of whether it is likely to lose or gain water molecules from another solution. A dilute solution, with its high concentration of water molecules is said to have a higher water potential than a concentrated solution, because water will flow from the dilute solution to the concentrated solution
(from a high water potential to a low water potential).:
Pure water has the highest water potential because water molecules will flow from it to any other aqueous concentrated solution even if this solution is a highly dilute solution.
Variables that affect the osmosis process in the potato rods:
Ø Independent variables: The Difference in concentration of salt solutions: This will affect the osmosis in the plant cell as I will prepare five different concentrations of the salt solutions and they are: 0.0, 0.3, 0.5, 0.7, 1.0and this is how they are prepared:
- For preparing the concentration of 0.0 I used pure water.
- For preparing the concentration of 0.3: I measured 3 cm3 of the salt solution by using the syringe and poured it into the test tube that is labeled 0.3, then I measured 7 cm3 of water and poured it into the same test tube.
- For preparing the concentration of 0.5: I measured 5 cm3 of the salt solution and poured it into the test tube that is labeled 0.5, then I measured 5 cm3 of water and poured it into the same test tube.
- For preparing the concentration of 0.7: I measured 7 cm3 of the salt solution and poured it into the test tube that is labeled 0.7, then I measured 3 cm3 of water and...
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... points on the graphs were plotted as accurately as possible practically.
All my results supported my prediction I made and helped me to make a strong trend in the graph.
Although, I might have got few anomalous results but that is to be expected, I may be have measured any substance which I am using wrong or not accurately. I repeated the experiment two times to get the accurate average results and to ensure that I had not made any mistakes and so as not to have any anomalous results in my experiment and there wouldn't be any chance for error to occurs.
My results seem reliable as I am basing my results' reliability on a hypothesis and my own prediction. I repeated the same experiments using different concentration of the salt solution or change the temperature so as to help the rate of osmosis in the potato rod.
Also for more accurate results, I could extend my coursework by testing the same brand of potatoes using different substances. By this
I mean using a different thing instead of salt, i.e. sugar or maybe any fruit juice. Then I could find out whether osmosis occurs differently with different things diluted in the water. I could even use different vegetables and fruits.
The Pullman Strike of 1894 was the first national strike in American history and it came about during a period of unrest with labor unions and controversy regarding the role of government in business.5 The strike officially started when employees organized and went to their supervisors to ask for a lowered rent and were refused.5 The strike had many different causes. For example, workers wanted higher wages and fewer working hours, but the companies would not give it to them; and the workers wanted better, more affordable living quarters, but the companies would not offer that to them either. These different causes created an interesting and controversial end to the Pullman strike. Because of this, questions were raised about the strike that are still important today. Was striking a proper means of getting what the workers wanted? Were there better means of petitioning their grievances? Was government intervention constitutional? All these questions were raised by the Pullman Strike.
The Great Railroad Strike of 1877 was the country's first major rail strike and witnessed the first general strike in the nation's history. In 1877, northern railroads, still suffering from the Financial Panic of 1873, began cutting salaries and wages. The cutbacks prompted strikes and violence with lasting consequences. In May the Pennsylvania Railroad, the nation's largest railroad company, cut wages
The period in American history between 1900 and 1920 was a very turbulent one. Civil unrest was brewing as a result of many pressures placed upon the working class. Although wealth was accumulating at an astonishing rate in America, most people at the lower economic levels were not benefiting from any of it. Worst of all for them, the federal government seemed to be on the side of the corporations. Their helpless situation and limited options is why the coal strike of 1902 is so important.
On the July of 1877, thousands of railroad laborers went on strike. The rest of America watched in shock. The Great Railroad Strike was one of the first of its nature, a complete halt in railroad traffic and seizure of railroads—across the entire country. The strikers would even destroy buildings, train cars, and other rail property, and in the wake of their destruction, other laborers and sympathizers still gathered in protest for the same workingman’s cause. Allan Pinkerton would condemn the strikers, stating that they had “unlocked the floodgates of anarchy and riot.” They were certainly violent. But they had also organized in less than a month—almost spontaneously—revealing that there were serious, commonly shared concerns toward industrial
The Railroad Strike of 1877 began with workers receiving a 10% cut in their wages, the angered workers, who had their wages cut twice since the previous year, decided to strike. The members of the union refused to go back to work until the pay cut had been returned. This resulted in disrupted rail service from Baltimore to St. Louis. Union tactics during the strike included rioting in the streets and destroying railway equipment. As a result of the strike, the Federal Government had to intervene. In this case, President Hayes sided with the railway company by ordering federal troops to halt union activity in West Virginia. Because of government intervention the union strike collapsed, but not before at least 100 people died in the fight. Due
By the eighteenth century, new inventions were brought to America, as a result the economy increased exponentially. More jobs were available for Americans, however, the free market affected labor workers negatively. Labor unions were created to cope with that and have been around since 1768, when journeymen tailors protested for wage reduction. In 1879, strikes commence, which cause controversial issues that affected society. It is accurate that labor unions destroyed the free market by encumbering businesses with regulations essentially penalizing the wealthy for being successful because workers demanded enhancement of working conditions, preferable wages, and minimum working hours.
In schools around the nation, many books have been banned from the teaching curriculum. Some of them deserve to be banned due to the explicit content only suited for adults. Some books like the Harry Potter series, The Catcher in the Rye, The Adventures of Huckleberry Finn and The Hunger Games. Granted, there are language issues in Catcher and Huckleberry Finn, but that language exists everywhere. The censorship should not be as strict as it is because many great books are being banned that students should be reading in order to gain an understanding on who some great writers were. Some of the banned books should be reconsidered on whether they should be censored or not.
Strikes had played a significant role during the Gilded Age ,and these were due to the worker being treated unfairly and standing up and fight for what they deserve. Different unions treated their workers differently, if the workers believed they were being treated just, then they would not go on strike and there would not be any conflicts. On the other hand, if the workers thought they were being treated unfairly then they would gain public attention and start a strike. Pullman hired people that were in need and a job, and this job would be their only chance achieving the American dream. They were put under harsh working conditions for sixteen hours a day (Pullman). A large portion of the workers were immigrants and freed slaves that were
...e general public was finally beginning to recognize that workers had the right to both organize and strike. The federal government was also taking note of the plight of factory workers. In 1895, the Supreme Court stated that it was charged with the duty of regulating interstate commerce (Doc. H). Overall, labor unions produced chain reactions that caused others to make strides toward equality within society.
The Biological Importance of Water as a Solvent and as a Medium for Living Organisms
When I am not using them I will place them away from my experiment and
The birth of this nation was built upon the hands of individuals who came to this nation seeking a better life. It must have took a lot of courage to leave their homeland, families, and a country where for the most part was efficient and well established, but so many did to start anew. Upon arriving in this nation, it didn’t take long for the settlers to discover the abundance of resources available and to know that the abundance of resources/ goods were extremely valuable. As the states flourished, so too were the desire for specific resources, goods/ services. For this reason, this paper will explain the economic perspective of comparative/absolute advantage and how they economically impact decisions made in our nation.
Hayes was also president during the Great Railroad strike of 1877. The Great Railroad Strike of 1877 consisted of workers protesting because their pay was lessened. After the president hired federal troops to stop riots, the railroad workers went back to their jobs. This was a victory for the president.
Osmosis in Potato Tubes Osmosis: Osmosis is the movement of water molecules through a semi-permeable membrane from a high concentration to a low concentration. Diagram: [IMAGE] [IMAGE] Aim: To see the effects of different concentration of sugar solution on Osmosis in potato tubes. Key factor: In the investigation we change the sugar solution from: 0%-10%-20%-30%-40%-50% this is the independent variable; the dependant variable is the change in mass. Prediction: I predict that all the potato tubes in pure water or low concentration sugar solution will swell because water enters their cells by osmosis.
The water molecule is a very small one but because of its unique properties it behaves like