50ml of the water was obtained and placed into a Styrofoam cup. A capsule was then added to the water and a timer was started. A stirrer thermometer was used to stir the water at a constant pace until the sponge emerged. Once the sponge creature emerged the timer was stopped and the time recorded. This experiment was repeated once more with distilled water heated to 80̊C (1).
Additionally, it was difficult obtaining a piece of rhubarb that was thin and particularly red, therefore the effect could not be best observed in the cells. Part B: Design your own experiment Parts of this practical were taken and slightly altered from the following link http://www.markedbyteachers.com/gcse/science/investigate-the-effect-of-surface-area-on-osmosis-in-potato-tissue.html Aim: To observe the effect different surface area: volume ratios have on osmosis in potato tissue. Hypothesis: If the potato has a larger surface area: volume ratio, the quicker osmosis will take place and the larger the mass will be at the end of the experiment, therefore the difference in mass of the potatoes from the start of the experiment to the end of the experiment will be larger. Additionally, the potato pieces left in a saltwater solution will decrease in mass, whereas the pieces left in water will increase in mass.
In this egg drop project, a container was built to house one egg and was then dropped at various heights. The purpose of this lab was to find how impact time affected the force with which an object, the egg container, hits another surface as the momentum moves to zero. Our hypothesis states that if the impact time is stretched longer then the force exerted on the egg would decrease, making the egg less likely to break. The independent variables for the egg drop project was the height at each drop; the dependent variables were impact time and survival of the egg. The controls were mass, design of the container, and the egg.
Next, he tapes down four plastic bowls to his base and in the bowls he added cotton balls to support the eggs as shown in image, JPG_0330.JP. Finally, he creates a parachute by using plastic bags and ties them to the base using string. When creating the parachute he told us that, “ the parachute will provide more air resistance” which he said would apply to Newton’s law of motion that states for every reaction there is an equal and opposite reaction.
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.
For this lab I will be using water and sucrose to demonstrate the rate of osmosis. In this lab I will be exploring how temperature impacts the rate of osmosis by placing pieces of potato of equal size in solutions of different temperatures and observing the change in mass of potato after a given period of time. The change in mass will indicate the rate of osmosis.
The mission was a success. The egg survived the fall without a hitch. Originally, I planned to have a circular container, believing that the round bottom would allow it to better absorb the impact. However, I noticed that the round shape would cause to very often land awkwardly, causing the container to roll around and occasionally flip.
Factors Affecting the Rate of Osmosis I. Research Question: How does the amount of Monosodium glutamate or MSG (C5H8NO4Na) concentration affect the osmosislarity of cow (Bos taurus ) liver cells? II. Background information Osmosis is the diffusion of water molecules through a partially permeable membrane from a region of high water concentration to a region of low water concentration. The factors affecting the rate of osmosis are temperature, concentration gradient, molecular size, surface area to volume ratio, and permeability. Animal liver cells, such as cow liver cells have a nucleus, cytoplasm, and a cell membrane.
Final Analysis Paper The egg experiment was a creative way to helping us learn more about the development of children. I really enjoyed this project. I was able to learn a lot and be creative all at once. My child was a girl and I named her Victoria Blake.
The purpose of the experiment was to test if osmosis worked in grapes, and this was supported by the fact that the grapes did experience osmosis. Over time, they gained mass as water passed through the grapes’ semipermeable membranes. All of the grapes expressed this, often peaking at twelve hours. For example, Grape 5 soaked in Coke reached a total of 9.95 grams at twelve hours. This can also be seen in other grapes, even in other fluids.
Think of it like this, adding salt to the water makes it like an ocean which is easier to float and swim in than just normal/ distilled water. This is because salt makes water denser. When salt water gets denser, the easier it would be for objects to float on it. My hypothesis was correct. The water did go inside the egg, but the ones with least salt increased the most, unless the egg was the smallest and it had enough space to take in a lot of extra water.
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).
The first thing we would do is get our materials we need, then put our eggs in the liquids we got and wait 6 days with the egg in each liquid. Then we would take the egg out of the liquids and then try to bounce the egg. Materials Our materials are… ~ A cup of Hot water ~
2. What process caused the egg to swell or shrink? Be SPECIFIC; discuss each liquid - Osmosis is the process that caused the egg to swell and facilitated diffusion caused it to shrink. Osmosis is the transportation
The eggs should be laid in a flask filled with water and dissolved test substance, and the development stages of the eggs should be controlled. Any change in the egg development should be recorded. A distributed egg appears in orange color and it should be thrown away immediately. The test should be carried out in many concentrations. The Growth and the development of the eggs were controlled under stereomicroscope.
