Part A: Osmosis practical task Aim: To observe the effects of osmosis in rhubarb cells. Hypothesis: Water will be extracted out of the cells in the salt solution causing the cells to look different to the cells in the freshwater solution. Materials: Rhubarb Distilled water in a dropping bottle Salt solution in a dropping bottle Microscope, slides, and coverslips Forceps and razor blades or scalpel Paper Towel Method: Clean and dry a slide and coverslip.
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.
In conclusion, the objective of the experiment was met since the process of osmosis was observed and
An experiment was conducted to determine the dissolved oxygen, phosphate and nitrate in Freshwater Creek on 22nd February 2016 at 10:46 am. The same tests were done by students previously however in this report only the recent 2 years results will be taken into consideration for comparing trends, anomalies and interrelationships. The recommended levels of dissolved oxygen saturation is 85%. The dissolved oxygen saturation last year was 85% at water temperature 22.9° and 2 years ago being 92% at water temperature being 23.1°. However this years it was recorded to be 80% at water temperature of 27.2° (see appendix 1 for the raw data table and calculations of Dissolved Oxygen).
The control group for the experiment was the dialysis bag and potato cores that were immersed in distilled water. Because the experiment was based on the change in molarities, distilled water was a good control because distilled water is pure and has no concentration of any solution. The experimental groups for this experiment were the dialysis bag and the potato
It describes how an extracellular solution can change the volume of a cell by affecting osmosis. If the extracellular fluid has higher osmolarity than the cell's cytoplasm, the cell will lose water and shrink (hypertonic solution). If the extracellular fluid has lower osmolarity, water will enter the cell, which may cause it to swell and even burst (hypotonic solution). An isotonic solution has the same osmolarity as the cell, so there is no net movement of water. 4.When is a hypotonic IV solution administered to patients?
Discussion A chemical reaction did occur in every combination, however no signs were shown for combination d) between sodium chloride and potassium nitrate. Indications of a chemical reactions occurring between these two compounds were not present, as in the colour did not change, and gas, heat, light nor sound was produced. In addition, when sodium chloride and potassium nitrate combine they form sodium nitrate and potassium chloride. The products sodium nitrate and potassium chloride are both aqueous, therefore no precipitate was formed either.
The purpose of this experiment was to take the temperature, pH, secchi disk reading and to collect water samples to calculate the TSI, dissolved oxygen levels and phosphorus and nitrogen levels. These were all collected to determine whether or not the body of water sampled is experiencing turnover, which trophic state it falls into and the nutrient levels. The data included in this report is from the collective data that was collected during the experiment. The data included is presented in table or graph form, along with explanations of the results. Being able to calculate the TSI or determine if a lake is in turnover is useful in helping to determine the properties of the lake, such as if it has high or low plant growth or if it will have
As mentioned earlier, the egg’s mass changed prior to the substance it was soaked in. This experiment was able to show the effects of osmosis where the egg was both depleted and expanded due to the diffusion of the water molecules. The egg’s change in mass depended on whether the solution of the substance was either hypotonic, hypertonic, or isotonic.
My science fair topic was would crystals grow larger with Epsom salt or sugar. Before doing the experiment my hypotheses was that the sugar crystals would grow bigger. To find a answer I had to go through a procedure. To make the salt crystals first I had to mix 1\2 cup of Epsom salt and 1\2 cup of hot tap water for a minute in a bowl. Next, I added drops of food coloring for some color in the crystals.
Osmosis is defined as the net movement of water across a semipermeable membrane. Osmosis can cause cells to swell and sometimes burst. We can see this property in the lab we did in class. When we put gummy bears in the water they grew up to 500% of their original size. This happened because the water was entering the cells, causing them to swell and increasing the size and mass of the gummy bears.
Diffusion and Osmosis Lab Report By: Jettica Williams BIOL 1107 Lab September 21, 2016 Prepared for Mrs. Fulford Lab Course Page Break The cell membrane act as a roadblock for cells. The cell membrane has a very hectic job. It restricts the access to what comes in and what goes out. The bond the membrane shares with others is the idea of accountability.
In hospitals patients sometimes receive fluids by intravenous injection. Doctors choose a salt solution and never plain water to inject into humans. You know that blood is composed mainly of red blood cells. Use your knowledge of osmosis to explain why doctors make this choice? Osmosis is the diffusion of water across a selectively permeable membrane from an area of higher water concentration to an area of lower water concentration.
Biology Design Practical Joshua Edwards What are effects of the volume of a potato and the amount of weight it loses when placed in salt solution? Introduction This design practical uses a potato’s surface area to volume ratio to see what affects it has on osmosis in different concentrations. Osmosis is the movement of water molecules through a cell membrane into an area of a higher solute concentration. The movement goes the way of the solvent with more solute because the lower solute concentration is drifting through balancing the ratio of solute per solvent (En.wikipedia.org, 2018).
Introduction: In this lab, of water in a hydrate, or a substance whose crystalline structure is bound to water molecules by weak bonds, is determined by heating up a small sample of it. By heating, the water of hydration, or bound water, is removed, leaving only what is called an anhydrous compound. Based on the percent water in the hydrate, it can be classified as one of three types: BaCl2O ⋅ 2H20, with a percent water of about 14.57%, CuSO4
