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). Once the results from each group were documented an unpaired t test was preformed using the collected data. The t test results were then plotted and graphed to determine whether or not heat had an effect on the emergence time of the sponge creature from the gelatin
Osmosis and Diffusion: Osmosis is the diffusion of water molecules from a higher concentrated area of water to a lower concentrated
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.
Fifty ml of salt effected the egg float the most, with average height 4 cm. Zero ml of salt effected the egg float the least, with average hight zero cm. Egg floated 0.3 cm in 15 cm of salt. Different amount on salt did effect the hight the egg floats in water. There are no obvious trends or patterns.
Osmosis is the spontaneous net movement of solvent molecules through a semi-permeable membrane into a region of high solute concentration, in the direction that tends to equalize the solute concentrations on two sides. There are 3 types of osmotic conditions that affect living cells, they are: hypertonic, hypotonic and isotonic states. These terms describe the osmotic state of the solution that surrounds a cell, not the solution inside the cell. Hypertonic conditions cause water to diffuse out of the cell, making the cell shrivel. Hypotonic conditions cause water to move into the cell swelling or bursting it. Isotonic conditions also allow movement of water in and out of the cell, but with no net increase inside or outside
The constant movement of solutes and water across cellular membranes is an overarching concept that helps to maintain cells’ growth and dynamic homeostasis. Water potential, the measure of the relative tendency of water to move from one area to another, takes into consideration the concentration of free water molecules. It is calculated using the following formula: water potential (Ψ) = pressure potential (Ψp) + solute potential (Ψs). The water in an organism moves down a concentration gradient, from an area of high water potential to low potential. In walled cells, turgor pressure, the resistance to water movement by the cell wall, also affects osmosis. When cells are placed in a hypertonic solution, one with a higher solute concentration and lower water potential, water will move from the cell to the solution, causing the cell to be flaccid, or limp. As water diffuses out of a cell, it undergoes plasmolysis, in which the cell’s living part, including the plasma membrane shrinks and pulls away from the cell wall. On the contrary, when cells are placed in a hypotonic solution, one with a lower solute concentration and higher water potential,
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.
- Osmosis is the process that caused the egg to swell and facilitated diffusion caused it to shrink. Osmosis is the transportation
When observing the leaf that was placed in the distilled water, the contents appear to be spread out completely against the cell wall and the wall appears to be swollen and hard. In this cell, the large central vacuole is observed to be completely filled with water. The cells of the leaf placed in the 0.9% saline solution appear to be less swollen but still full. When observing the leaf that was placed in the 5% saline solution, cells appear shriveled up on the inside of the cell wall. In these cells, the central vacuole cannot be seen at all.
They really saw how the cell was semi permeable because it allowed the water to leave and enter the cell during different situations. The question that had to be answered on Day 1 was what happened to the egg cell after it was put in vinegar. The hypothesis was proven correct because the egg cell shell was eaten away at by the acidic vinegar since the circumference grew by 13mm. The shell was really soft. If it was in there a little longer that the shell would eventually disappear. The question that had to be answered on Day 2 was, what happened to the egg cell’s mass when it was in water for 2 days. The hypothesis was proven wrong because it was thought that the cell’s mass would stay the same. It did completely opposite. The cell’s mass gained.
Although the percentage difference has decreased to 10.42%, the difference is still positive as osmosis is still occurring. However, this time there isn’t a great difference between the water potential of the potato and the water potential of the solution. As a result the net movement of water molecules by osmosis is less, than that in the molarity of
We think that the egg in hot water will become a hard boiled egg so it will bounce,we also think that the egg in chunky milk will become more solid, we think that the vinegar will make the egg bounce
All cells contain membranes that are selectively permeable, allowing certain things to pass into and leave out of the cell. Osmosis is the process in which water crosses membranes from regions of high water concentration to areas with low water concentration. When the concentration of the environment outside of the cell is lower than the inside of the cell, this is called a hypotonic solution. In hypotonic solutions, when water moves into the cell they burst, which is known as lysis. A hypertonic solution is when the concentration of outside the cell is higher than the inside of the cell. In hypertonic solutions, water moves out of the cell, making the cell lose water and shrink; this is called crenation. An isotonic solution is
The experimental hypothesis for this experiment was prove as the results from the experiment provide evidence to suggest so. The osmosis process was shown when the potato cylinders were submerged in the salt solution and over time this only became more prominent. Looking at graph A, the potato cylinders submerged in the water solution gained mass and became harder when pressure was applied. This meaning no osmosis happened as expect as the mass gain implies there was just passive transport. The water molecules in the water solution were small enough to pass through the semi permeable membrane in order to equalise so there was a balance between the potato and the water solution.
Osmosis and diffusion have similar concepts but have their own individual processes. Osmosis is the process in which there is transport of a solvent through a semipermeable membrane that separates two solutions of contrasting solute concentration. During osmosis, the solvent moves from the solution that is lower in concentration of solute to the solution that is higher in concentration of solute, eventually reaching an equilibrium (Johnston). Diffusion is the movement of matter from one point to another by random molecular motions. The rate of diffusion of a substance is proportional to the concentration gradient of that substance (Leaist). In the experiment there were 4 different test groups: the control (tap water in tap water), 20% fructose in tap water, 40% fructose in tap water, and tap water in 20% fructose.