... tile * measuring cylinder * stop watch * beaker * tissue paper * ruler Method: A range of sucrose sugar solutions were prepared with concentrations 0 molar (distilled water), 0.5 molar, and 1 molar. Three sections of potato were cut using a scalpel and will be ...

... had to be very careful whilst using the scalpel because it was extremely sharp. 2. Then, I placed them onto a ceramic tile to avoid any dirt reaching it. This is because dirt could hinder the progress of osmotic activity, and ...

... heated up. Scientific knowledge A catalyst is a substance, which speeds up a chemical reaction but remains unchanged at the end of the reaction. All metabolic reactions in living cells are catalysed by enzymes. These are biological catalysts made of globular proteins, ...

... tissue paper. Measure the masses on a top-pan balance and record this new mass. Also measure the length of each potato tube and record this new length. Safety: Use the scalpel with care as it is very sharp and also use a ...

... will do three different times for the different solutions. The first time will be for 20 minutes, the next 40 minutes and the last for 17 hours. This will give a chance for me to see if tit is time ...

... few days and then take out all the cylinders and weigh them again, then measure them. The difference in weight and length will help me find out how the different sugar solutions have affected the potato cylinders. The longer the cylinder ...

... We decided to reduce the liver slightly to 2.5g so that we would stay within the maximum capacity of the measuring cylinder (50ml) on higher results. From the preliminary work, we concluded that 20ml of 2 volume hydrogen peroxide and 2.5g ...

... potential gradient. Any solution with high concentration will have a low water potential and visa versa. The highest water potential being that of water with a value of 0. Solutes in water give the solution negative water potential. The direction in ...

... a cellular level. The cells that we are looking at are large, thin-walled, and usually have a large central vacuole. They are often partially separated from each other. In areas not exposed to light, as in a potato, food storage ...

... fer sefefew orfe fek infe fofe fe; Water potential is a measure of the ability of water molecules to move from one region to another. The more water molecules there are per volume of the cell the more likely that by ...

... capillary tube drops which in turn means that the ? of the solution in the tube goes up. A Simple Preliminary Osmosis Experiment Aim The aim of this preliminary experiment is to approximately find the water potential ? of potato tissue so that ...

... This liquid or hydrostatic pressure works against osmosis. Turgidity is very important to plants because this is what makes the green parts of the plant "stand up" into the sunlight. A lack of water may lead to the wilting of ...

... the froth produced by the reaction with a ruler. To make the experiment accurate I will use the same sized test tube and I will measure in millimetres. My control variable To keep the experiment fair I will keep the amount ...

... glucose are too big to fit through the material. Osmosis has a significant effect on living cells. Animals cells will burst in pure water because, as the cytoplasm is fairly concentrated, the water, which is less concentrated, will enter the cell. ...

... in the saucepan. This causes the potatoes to swell and become soft. In order to prevent this from happening salt is sometimes added to the pure water in the saucepan creating a solution that is equal to or greater than ...

... the potato will grow in mass and in which it will decrease in mass. Even before i have done the experiment, I am in a position to make a predictio using my own knowledge of osmosis. I predict that the potatoes ...

... in the reactions they catalyse and can be used over and over again, only a very small amount of an enzyme is needed to catalyse a reaction. A reaction will reach its maximum velocity when all the active sites of ...

... double the rate of reaction. To see if the prediction is correct the amount of gas collected throughout the experiment at set intervals of time will be used when the reaction takes place. Pilot Study Before carrying out the real experiment a ...

... down a concentration gradient to become isotonic (they have the same concentration of sucrose molecules). If the plant cells (for example a potato tuber) are placed in solutions of higher concentration than the cell sap then water will move out ...

... volume of the solution that the potato chips are kept in must be fair. The must be totally covered in the solution, and the amount of solution will be kept the same because all the potato chips are the same size. ...

... solution it's mass will decrease. Equipment; Five test tubes - To hold the potato and each one of the five sugar solutions individually; Test tube rack; Knife and equipment to cut potato into 5 pieces of equal mass; Measuring cylinder ...

... water from the ground. ( Source: Projectrevision.co.uk/UK-learning.net) I predict that depending on the concentration of the sugar solution, the potato cells will either increase or decrease in size. So a highly concentrated solution will result in a decrease in size - ...

... which the enzymes have digested. It will be measured using a ruler in millimeters for the most accuracy. My plan. Place 6 corked bored holes in each of the 5 agar plates. (Do not fully take the lid off the agar plate ...

... remember to push the blade away from you, because if you slipped then you could cut yourself. 2. Using a corer cut out cylinder shaped pieces from the potato. Make sure you use the same sized corer each time so you ...

... same throughout. The mass of the potato is a dependent variable. This means that it will be measured throughout the experiment. I will measure the mass in grams. The potato chip will be measured before it is put in ...