Investigate the Osmotic Point of Equilibrium in a Potato
The following Passages are information which I have managed to find when researching the topic of Osmosis: -
The cell membrane controls the movement of substances going into and out of the cells. The cell therefore controls the Chemical composition of the internal environment of the cell. It does this in two ways;
Passive Process - this does not require energy
Active Process - this does require energy to occur
This works in principle which diffusion in which molecules and ions in a solution move from an area of high concentration to an area of low concentration resulting in the equal distribution of molecules. Cells membranes are selectively or partially permeable, this means moving the membrane allows certain molecules to pass through it moving freely down the concentration gradient but not others.
Osmosis
The cell membrane is partially permeable in that it allows some molecules to diffuse rapidly but slows the passing of others.
The glucose molecules try to diffuse to the outside but cannot get through the membrane because the pores are too small. The water molecules diffuse trough the pores down the concentration gradient.
This membrane- controlled diffusion of water molecuse is controlled by osmosis, it can works both ways so that it can pass into and out of the cell.
Osmosis and Diffusion
If water is withheld from a flowering plant, the flowers wilt. If bacterial cells are placed in concentrated salt water solution, they collapse and die. Human red blood cells placed in fresh water expand and burst. These are examples of the effects of osmosis, the process by which water passes through a cell membrane.
Osmosis is possible because of the constant state of motion that exists at the atomic and molecular levels of matter. Specifically, in liquid solutions, molecules of solute (the dissolved substance) and solvent (the substance, usually liquid, in which the solute is dissolved) move about randomly, spreading from regions of high concentration into regions of low concentration. This process is called diffusion.
If a cell membrane allowed an equal passage of solute and solvent, diffusion through the membrane would lead to a cell whose internal composition would be identical to its environment. This does not occur because the cell membrane is differentially permeable, or semipermeable-that is, it is permeable to some molecules but not to others. Water molecules (and dissolved gases such as oxygen and carbon dioxide) pass through the membrane much more readily than dissolved solid solutes, such as sugar and salt (see Cell, "The Cell Membrane").
If the environment is hypertonic (having a higher concentration of solute than the cell), water diffuses out of the cell.
Rape is a physical attack, not sex. Rape crisis counselors and researchers define rape as an act of violence in which sex is used as a weapon (Benedict 2). A woman is raped in this country every two minutes. Between 1996 &1999 7,787,00 rapes were reported. The actual number is much, much higher because only 26% of rapes are reported. Husbands or boyfriends assaulted 28% of these women, 35% of these women were raped by people they knew; 1 in 4 of these rapes took place in a public place (Grady 4). Rape is a problem that infiltrates all countries and cultures; a Muslim woman who has been raped is disowned by her fiancé and her family for having brought them shame by becoming dirtied and thus not a candidate for marriage (Benedict 2).
If a cell is in contact with a solution of lower water concentration than its own contents, then water leaves the cell by osmosis, through the cell membrane. And if the cell is in contact with a solution of high water concentration than its own then water goes into the cell. If you put a plant cell in water, water enters by Osmosis, then it swells up. However, the cell will not burst. This is because the cell walls are made from something which is extremely strong.
Investigate the Osmosis of Potato Cells in Various Salt Solutions. Introduction I have been asked to investigate the effect of changing the concentration of a solution on the movement of water into and out of potato cells. I will be able to change the input of my experiment. The input variable is the concentration of the solution.
Boyes, Jennifer. “How to get your horse or pony ready to show”. Preparing for the show ring. 8 March 2008. Web.22 Feb 2010
Every competitor has a question when showing. The question that may come up is what breed of horse do judges prefer? The real answer is that judges don’t necessarily care what breed of horse you have. Their real focus is on the the horse's structure and confirmation. Confirmation includes your horse’s balance and degree of muscling. However, some experts say the American Quarter horse is the best breed to show, “perhaps nowhere else is the breed’s versatility, heritage and work ethic more apparent than in the show arena” (“AQHA Competition Classes”). American Quarter horses are better for showing because “they change leads precisely, easily, and simultaneously” (“AQHA Competition Classes”). Regardless of the horse’s breed, any horse can be trained to do well in the show ring.
Saving up for the retirement is one of the most important decision we all should make in our 20s. To do so, we can open an individual retirement account (IRA). IRA is mostly like a saving account, which helps you build your nest egg. The difference of IRA with a saving account is that you can use some tax-advantages while you are saving up for your retirement. “Individual retirement accounts, or IRAs, give people a way to build tax-deferred savings for retirement. An IRA is an account, not an investment” (Bankrate, 2009). There are four types of IRA: Traditional IRA, Roth IRA, SEP IRAs, and SIMPLE IRAs. According to “Roth IRA vs. Traditional IRA: What's the Best Choice for You?” an article by Matthew Frankel the Traditional and Roth IRA are
[Social Security is unreliable, with its low return rates and unpredictability, to the point where you must look elsewhere for a comfortable retirement. With an IRA plan you have a low risk way of making money so that you may one day achieve what you consider the American dream to be. There is one thing I can recommend that will help you with that dream.]
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.
Investigating Osmosis Using Potato Cylinders The aim of this investigation is to see how the sugar concentration of a solution eventually affects the size of a submerged potato cylinder. I am conducting this experiment to further my understanding of osmosis. The increase or decrease of the size of the potato cylinder can be explained by osmosis. Introduction:-
Under Defined contribution Pension Plan, the employer will set aside a certain amount or percentage of money as benefits of the employees. There are restrictions as to when and how they can withdraw these funds without penalties. The amount contributed is fixed while the benefit is not. The employees bear the risk instead of the employer.
Central banks are in constant need of gold. They use this precious metal to increase their gold reserves, which may serve as a guarantee to keep promises to pay to note holders, depositors, trading partners, or be used to secure currency. Banks are considered as one of the largest sources of demand for gold.
4. Put each group of potato discs in one of the 6 test tubes and watch
It must be a sport if it’s in the Olympics. I’m sure it’s in the Olympics because the kind of shows people do can become very competitive and eligible for the Olympics. I think it might be more competitive than other sports because you’re riding a 1200lb animal and it takes a lot of hard concentration and work to train the horse and get it ready for competition season. If it’s in the Olympics no one can really argue that it is not a sport, therefore I have made my point. If someone were to argue that it is not a sport because “the horse is doing all the work” , well I would tell them you get on it and see how “easy” it is. It’s not easy unless you ride often getting ready for show season, or even just for fun. The rider and the horse need to be in good shape. I would also then argue it’s like the most expensive sport out
... IRA. The retirement account is rolled over to an allocated gold account. This is a wise move to secure retirement earnings because the funds cannot be touched by employers in case the investor decides to leave his or her job.
Osmosis is the passage of water molecules from a weaker solution to a stronger solution through a partially permeable membrane. A partially permeable membrane only allows small molecules to pass through, so the larger molecules remain in the solution they originated in. Solute molecule [IMAGE] [IMAGE] Water molecule [IMAGE] The water molecules move into the more concentrated solution. When water enters a plant cell it swells up. The water pushes against the cell wall and the cell eventually contains all that it can hold.