Water Potential Osmosis Experiment

Osmosis Lab Report Research Question: How does the change in the concentration of a sucrose solution affect the process of osmosis in a potato cell by measuring its mass? Background information: 1 Osmosis is the process by which a liquid passes through a semi-permeable membrane, moving from an area with a high concentration of water to a low concentration of water. There are various factors that affect osmosis such as: concentration, surface area and temperature. The concentration of solutions can affect the rate of osmosis, as there is more difference in the concentration of the solutions, which means osmosis, will take place quicker. Surface area could affect osmosis based on the ease by which molecules can get through the semi-permeable

Column chromatography set-up After setting up the column, 2 10-ml of the chosen solvent was obtained and was placed in two separate test tubes. Using a dropper, ~0.5 mL of the food dye was put into the column by dropping it at the side of the column in a circular motion. The chosen solvent was then added just after the green food

Preheat oven to 374°F (190°C). Brush well the surface of melitzanopita with butter, carve its surface with a knife and sprinkle some sesame. Bake for around 55 minutes or until its surface gets a nice golden brown color. Remove from oven and allow to cool down for 5 to 10 minutes.

Higher Concentration of Sucrose Lowers the Mass of a Potato Independent Variable: Concentration of Sucrose used Dependent Variable: Mass of each Potato after Experiment Constant: Size of Potato being used at room temperature Introduction We learned about hypertonic and hypotonic environments before this lab as well as what takes place during osmosis. Do potatoes loose or gain mass when soaked in specific solutions such as sugar or salts? Sugar is a large molecule and has low permeability. Potatoes are a starch which means it is composed of many polysaccharides, therefor has low permeability.

Bacterium growth on various agar plates Introduction The purpose of this experiment is to show different agar plates inhibit or enable growth of different organisms. Some varieties of media enable the grow of a wide range of organisms such as nutrient agar. Other media are selective which means they contain specific nutrients to encourage the growth of certain organisms. This means other organisms will die due to the selective nutrients such as high concentration of salt which will cause plasmolysis.

Catechol oxidase is found in cell cytoplasm, their function in plants are to "help protect damaged plants bacterial and fungal disease." The objective of this experiment is to test the presences of catechol oxidase in various fruits and vegetables. Our group hypothesis states that, If catechol oxidase is present in the selected extracts, the null hypothesis is that catechol oxidase is not present in the selected extracts. Next, the prediction would be, if catechol oxidase doesn't differ with other enzyme sources, then the rates will

Chicken Avocadoes Lime Soup Homemade chicken avocadoes lime soup, doesn’t that sound Delicious! This simple, yet filling dish can serve a family of six. The preparation time takes roughly fifteen minutes and cook time is approximately twenty minutes. Soup recipes are usually a very simple dish and the magic happens on the stove over the fire.

When testing one organism, for example Mycobacterium tuberculosis, the dilution is prepared in agar slopes but at this time it is necessary to prepare another identical set to be inoculated with the organism which is control. To make dilution a small volume of water is used and then the dilute is added to agar that melted and then cooled to 60degrees C. If chocolate agar is required blood is added, and the medium must be heated before addition of the antibiotic. Petri dishes with 90mm diameter are convenient to be used and one ml of the desired drug dilutions is added to 19ml of the broth.

Nutrients are chemicals elements that plants and animals require for growth. Macro nutrients nitrogen, phosphorus, and potassium are found in artificial fertilizers. My neighbor would be affecting the nutrient cycle because the fertilizer is extracting nutrients from the soil and leaving them to be placed in the aquatic environment. This affects the Nutrient Cycle. When these nutrients are taken away this can lead to the soil lacking the micro nutrients that are needed.

The variables measured are nitrate, nitrite, total phosphorus, ammonia and transparency. Harrison also states that river and Lake Eutrophication is a problem across most of Europe because of excessive nitrogen and phosphorus levels from agricultural, industrial and domestic effluents. Harrison states that natural organic matter is present in most natural eco systems.

Catalase activity test establishes whether the bacterium produces the enzyme catalase. The eosin methylene blue test or EMB, inhibits the growth of gram positive bacteria and tests whether or not gram negative bacteria can ferment lactose. Lactose fermentation testing is done to see if the bacterium is capable of fermenting sugar by testing for acid and gas production. These are the possible tests that are needed in order to identify unknown

The experiment we did was a lab to discover how “Miracle Gro” affected the germination of seeds. My group’s original hypothesis was that the seeds with the highest concentration of “Miracle Gro” would grow the most compared to the other seeds. However, after 8 days, the results were the exact opposite; the seeds that got 0% of “Miracle Gro” turned out to be the healthiest and tallest. By the third day, all five seeds, for the water solution, where sprouting. On the other hand, the solution with 4% “Miracle Gro” only had 3 seeds starting to sprout.

Developing a topic for Science Fair will never be easy unless you have a little background about that certain topic. One particular scientist is developing her topic by researching questions she has that revolved around her topic. The scientist will be researching how water temperature can affect the chemical reaction rate between baking soda and citric acid within a bath bomb. The independent variable will be the temperature of the water (mL). The dependent variable will be the chemical reaction rate which is formed by baking soda (g) and citric acid (g).

Osmosis is one of the most important regulators in the body. Osmosis regulates solvents through a semipermeable membrane from a less concentrated solution into a more concentrated one, creating equal concentration in and out of the cell. For the purpose of this laboratory a dialysis bag will be used to imitate the semipermeable membrane of a cell. The dialysis bags will be filled with different concentrations of sucrose and placed in distilled water to mimic osmosis. With the dependent variable being the mass of the bag and the independent variable being the sucrose.