Concentrations

of this lab was to use the technique of colorimetry to determine the concentration of the Cupper (II) ion, Cu2+, in a sample of ore. Then a colorimeter or spectrophotometer probe was used to determine the relationship between concentration and light absorbance Using the known solutions of Cu2+concentrations. Points were then graphed which allowed determination of the concentration of the solution with unknown Cu2+concentration from its absorbance measurement. A standard curves shows the relationship

Osmosis is the diffusion of water entering and leaving cells to keep a balance of concentration and water between the cell and environment. The process of osmosis constantly occurring in a cell and is critical for the cells in animals and plants for survival. Factors that influence the rate of osmosis are temperature, molecular size, pressure, and concentration gradient. These variables can increase or decrease the rate which osmosis occurs. If a cell takes in too much water through osmosis, it can

Independent variable Sucrose concentration (M) (±0.01 g) This variable would impact the investigation as the higher the concentration of sucrose that is used in this experiment, the average percent change in mass in Solanum tuberosum core will decrease. This will occur due to the fact as the solute concentration begins to increase in the water, the solution will eventually become hypertonic, thus the percent change in mass of the Solanum tuberosum core will start to decrease as water molecules

The Effect of Salt Solution Concentrations and Water On the Mass of Potatoes Research Question What happens to the mass of the diced potatoes when submerged in varying concentrations of salt solutions and water in 10 minute intervals? This experiment will compare the mass of the diced potatoes submerged in distilled water, 1% salt solution, 5% salt solution, and 10% salt solution respectively in 10 minute intervals. Background Information Potatoes first originated in South America and were later

Monica Saripella Beibei Xin: Thurs @ 5 2/19/14 Lab Report #1 The Effect of α-Amylase Concentration on the Rate of Starch Hydrolysis in a Porcine Pancreas Introduction: Our body uses various different types of molecules that work together in order to keep us functioning. One of these molecules is called amylase. Amylase is an enzyme that breaks up the glucose chains in starch into maltose. Enzymes work to speed up a reaction by lowering the activation energy needed for the reaction to occur. There

At the start of this experiment, the class put on aprons and protective goggles as safety precautions. The students then put one pipette of glucose and one pipette of yeast into a test tube. The instructor filled a 250 ml beaker at each station filled with 37° Celsius water. Next, the test tube with the glucose and yeast solution was placed in the beaker to incubate for 10 minutes. After the 10 minutes had passed, a clean pipette was used to remove 1 ml of the solution from the test tube and place

whether different sucrose concentrations affect the rate of osmosis. In order to do this, we constructed artificial cells out of dialysis tubing filled with 20% sucrose and 40% sucrose and weighed them every 10 minutes for 90 minutes. In doing so, we concluded that the higher the sucrose concentration, the faster the rate of osmosis. Introduction Osmosis is the passive movement of water from an area of low solute concentration to an area of high solute concentration, normally across a membrane

Introduction Water diffuses across the membrane from the region of lower solute concentration (higher free water concentration) to that of higher solute concentration (lower free water concentration) until the solute concentrations on both sides of the membrane are equal. The diffusion of free water across a selectively permeable membrane, whether artificial or cellular, is called osmosis. The movement of water across cell membranes and the balance of water between the cell and its environment are

Lab Report (Effect of concentration on enzyme activity) Biology Noor Alawadhi 11- KC Introduction: An Enzyme is a protein, which is capable of starting a chemical reaction, which involves the formation or breakage of chemical bonds. A substrate is the surface or material on or from which an organism lives, grows, or obtains its nourishment. In this case it is hydrogen peroxide. This lab report will be explaining the experiment held to understand the effects of the changes in the amount of

on each of the 5 different sucrose concentrations were repeated for each concentration 5 times for higher